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Observations

Feb. 20, 2019, noon PST

Region: Snoqualmie Pass
Observation by Marc Simonpietri

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Roaring Ridge

Route Description: Roaring Ridge standard approach, ascended to about 3,800ft and then descended the same aspect.

Weather: Broken to Overcast most of the day. Very light snowfall at 12pm.

Snowpack: dug a pit at 3,480ft on a N aspect. Found a thick crust 115cm deep. snow profile: 1F to fist, mostly right side up Deep Tap Test: DTM11 @ 115cm/PC/Q2; DTH24 @ 115cm/RP/Q2 Compression Test: CTM19 @ 50cm/BRK; CTM20 @ 50cm/RP/Q3; CTM18 @ 45cm/RP/Q3

Feb. 18, 2019, 10 p.m. PST

Region: West Slopes North - Canadian Border to Skagit River
Observation by Ben Johnson

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Heather Meadows

Route Description: Herman Saddle -- Chain Lakes -- Anderson Creek Valley

Weather: High overcast, light winds, brief sun breaks in the afternoon.

Snowpack: Thick breakable crust on solar aspects, cold settled powder on shaded slopes. Widespread 6-8mm surface hoar in sheltered terrain NTL. In some places, the surface hoar sits on top of yesterday's sun crust.

Avalanches: A large and very impressive crown was visible on the steep N-NW slopes of Table Mountain above Iceberg Lake, around 5,200 feet. Cornice fall triggered a shallow wind slab, which then stepped down ~3 feet, likely to the 2/8 PWL. This slide pulled a few small trees with it, and ran well onto the flats of Iceberg Lake. My guess is that it ran sometime last night, but I'm unsure of that.

Feb. 18, 2019, 8 p.m. PST

Region: West Slopes Central - Skagit River to South of I-90
Observation by Jere Burrell

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: South of I-90 between Garcia and Bandera

Route Description: South of I-90 between Garcia and Bandera

Weather: Overcast skies, calm to light winds on ridgeline, light snow and obscured visibility with waves of visibility across the valley to mtns north of I-90.

Snowpack: BTL: >2,500’, east aspects, consolidated base with ~ 35cm- 65cm settled storm snow. Informal snowpack obs demonstrated strong bonding to the January/February stout crust. Non planar/ break on hand shears. No cracks on kick turn cuts. NTL: 4,000’- 5,100’, E-S-W aspects, surface form were a mix of dendrites & graupel, ~ 1m settled storm snow on stout Jan/Feb crust. On steeper slopes a pencil hard surface was under 3-4cm of newish snow. Probing has revealed the presence of the Feb 8th buried surface facets in numerous areas throughout the zone. Slow and gentle probing has revealed a gradually denser snowpack profile. Nearing 100cm’s +/- an audible thin crust , a pop, and 1-2 cm’s of low density snow will be felt just before the stout crust. @ 4,500’ 27 degree west slope: CTM SC down 102cm, ECTX, PST 40/100 End down 102cm 20190208 (1-1.5mm BSF/FCsf/xr).

Avalanches: Old midstorm avalanches were seen throughout the terrain from 3,000’- 5,000’. All of these were the same character as noted during post storm obs. Interestingly some slides did not propagate across the entire path and left a firm and shallower bed surface while adjacent there was deep, undisturbed sections of settled storm snow.

Feb. 18, 2019, 7 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Jeremy Allyn

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Crystal Lakes

Route Description: Crystal Ski Area - Upper Crystal Lakes - upper Morse Creek- out via Exit Chute and Silver Basin

Weather: Mid teens-mid 20s, overcast-obscured skies, periods of light snow, steady moderate W winds at ridgecrest with light-mod blowing snow. Sun breaks never materialized

Snowpack: Very thin wind slabs forming at surface on lee and cross loaded features above 6000ft. Otherwise, most surfaces uncohesive, settled and cold with little to now temp/sun affect. Upper snowpack continues to slowly settle and gain strength. Superb ski quality

Avalanches: 1 recent large slab in start zone of Pk 6595 at top of G-String Couloir, above lower Crystal Lake. N, ~6500ft, D2.5-R3. Details are vague but was apparently ski triggered. See photo 1 older natural persistent slab likely triggered by wind loading on 2/14. NNE, 6200ft, N-D2.5-R3-O. Wide propagation, failure plane probably 2/10 surface hoar. See photo 3 Loose Dry in upper Morse Creek. SE, ~6400ft, D1-1.5, running 300ft. Some looked ski triggered Loose Dry reported in Dog Leg Chute. N, ~6400ft, running far and length of terrain feature

Feb. 18, 2019, 2 p.m. PST

Region: Snoqualmie Pass
Observation by Mark Garrett

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Open snow slope just west of Snow Lake trailhead

Weather: Cloudy with light snow, some blue sky showing.

Snowpack: Pit test on open slope at 3400 ft elevation. Total snow depth 260 cm (8 ft 6 in). New snow layer uniformly very soft, 90 cm deep (3 ft). Next layer is very hard ice about 1 cm thick, followed by about 40 cm hard layer (pencil test). Bottom 130 cm is softer (based on probe, did not dig down below the hard layer).

Feb. 18, 2019, noon PST

Region: Mt Hood
Observation by Ryan Butler

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Tom Dick and Harry mountain, above Mirror Lake

Route Description: Wandering approach up the main face

Weather: Sunny AM, clouds and low vis PM

Snowpack: Deep powder still, slightly heavier/saturated at lower elevations. Stability seems to be increasing, ski and stomp tests at varying elevations and angles with no results

Avalanches: Two small slides were seen. Looks like the results of sunny weather Sunday the 17th. Pretty shallow, less than 10cms in depth. Photos attached are of both. The one that was below the skin track likely looks skier triggered from above, the other photo is a bit farther out, but no influence from skiers.

Feb. 18, 2019, noon PST


Observation by Garth Ferber

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: SW side of Mt Herman and NE side of Table Mountain

Weather: Overcast

Snowpack: Pit 5350' on a SE facing slope near Herman saddle had 20 cm of 4F, over 80 cm of 1F, with a crust at 1 meter with mainly RG at 1F/crust interface. All slopes on southwest side of Mt Herman and northeast side of Table Mountain were skied by many people today, some 45-50 deg steep, I saw no avalanches. Good skiing non-solar slopes.

Avalanches: None

Feb. 18, 2019, 5 a.m. PST

Region: Mt Hood
Observation by Andy Traylor

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Mt Hood, South Side and North Side, elevations 6,000' to 11,000'

Route Description: Palmer up to the Hogsback, Pearly Gates left to summit, dropped down the Sunshine route (NW), traversed under Eliot HW, climbed up the Ravine and finished on the North Face exit, skied back down ZigZag and Palmer.

Weather: Clear to patchy clouds all day, south side of the mountain had gusty 5-15 mph west winds, strongest at Hogsback, northside had 10-30ish mph west winds, very strong at Cathedral Spire col and northside of summit ridge from 10,500 to 11,000.

Snowpack: Palmer, Zigzag and most of the southside that we saw held 6" to 1' of fresh, wind-affected snow. No crust or rime which made for nice skiing. With cold, low density snow, lots of wind transport was apparent. Some wind slab development where you'd expect, largely SE to NE aspects. Dropped skis at the Hogsback and they were buried by ~1' snow upon return 5 hours later. Northside held similar conditions. Protected areas on leeward aspects held waist deep unconsolidated snow.

Avalanches: None seen. Somewhat surprisingly did not witness whumping or shooting cracks. Did see witness some wind slab development with most 2-6" thick. Quick hand shear tests throughout the day did not show much reactivity.

Feb. 17, 2019, 9:30 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Brian Carpenter

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Paradise, MRNP

Route Description: Edith Creek basin to bottom of Golden Gate, then west along south side of Panorama Point; then south on Skyline summer route west of Alta Vista

Weather: Partly sunny, then socked in. Minimal wind. Temps started out at about 20 but warmed up during the day.

Snowpack: Wind-affected dune ripples visible on the SW-facing slope that is Golden Gate. Wind slab and wind-scoured surfaces found throughout the day. Cornices visible on ridge crests, facing east. Dug a quick pit on a SW facing aspect at 5600' on south side of Alta Vista. At this point it was clouded over and no wind or solar effect. Found the February 8 crust down about 120cm. The snow on top of this was quite uniform in consistency with no noticeable layers. A CT test produced no results on the column. A shovel tilt test produced results on two narrow (10-15cm) and contiguous weak layers about half way down to the 2/8 crust. The shovel tilt test also produced a clean break on the February 8 crust. The previous day's snow pit, dug on a north-facing aspect at a slightly lower elevation (5100') in the Paradise area known as the Refrigerator, had 80cm of uniform density snow on top of the February 8 crust. A CT test on the column also produced no results. The shovel tilt test only found a failure at the Feb 8 crust interface, with no sign of the intermediate weak layers found today.

Avalanches: Shallow loose wet sluffs on the south face of Panorama Point and east side of Alta Vista.

Feb. 17, 2019, 9 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Jeremy Allyn

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Rainier - Tatoosh Range

Route Description: North aspects under The Castle/Pinnacle Peak via Reflection Lake. We took wanded trail through woods, avoiding steep open slope above Narada Falls

Weather: Party sunny with skies quickly becoming obscured, occasional convective light snow, fair-poor vis up high. Temps lower-mid 20s, calm-light SW winds

Snowpack: HS averages 3 meters NTL. BTL-NTL 15-20cm of uncohesive new sits on settling and strong upper snowpack. Some planar shears within older storm snow at slight density breaks down 35 and 45cm, healing quickly. Early Feb crust complex down 90-120cm. No double crust/facet combo observed on N asp at 5900ft. Very thin layer of rounding facets (1-2mm) down 90cm produced no notable results. Large older wind deposits and drifts below ridges and cols, very terrain influenced. Once lower in terrain, ski quality was superb.

Avalanches: No recent avalanches. One older (~72hrs) slab under bottom cliffs of Pinnacle Peak, NE, 6200, decent propagation, 2ft deep?. Steep sunny terrain in adjacent drainages showing surface instability, point releases, and small loose wet activity

Feb. 17, 2019, 4 p.m. PST

Region: East Slopes North - Canadian Border to Lake Chelan
Observation by Drew Lovell

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Upper Twisp River

Route Description: Low to Mid-elevation burns, northerly aspects, <30 degree slope angles Great ski quality. Surreal to ski smooth, boot-top pow as shooting cracks continually unfold beneath the ski tips. Avoided avalanche terrain, needless to say.

Weather: BKN skies, light variable winds, -3C

Snowpack: "Methow Continental": generally weak and faceted The 2/8 facets are overlain with a 30-40cm slab in this zone, depending on elevation and location within the watershed. Over a couple of days of traveling similar terrain, the reactivity of the recent slab is trending from very touchy to slightly less touchy. With settlement of the storm snow, the propagation of shooting cracks has increased from a few meters on 2/15 to tens of meters on 2/17. Similarly, the perception of collapse has increased from beneath-the-skis to slope-scale in extent. Triggering a punchy Size 2 is only a question of slope angle, given the structure. The "considerable" hazard rating is definitely justified in the Near and Below Treeline of the Twisp River.

Feb. 17, 2019, 3 p.m. PST

Region: Snoqualmie Pass

Did you see any avalanches? Yes
Did you trigger any avalanches? Yes
Was anyone caught in an avalanche? Yes

Area Description: Christmas tree basin, Snoqualmie Pass

Route Description: Hyak parking area, ascend through Christmas Tree basin, summit Roaring Ridge, snowboard decent same route.

Weather: Clear/cloudy approx 32 deg F

Snowpack: Pit was dug on a similar aspect, but far less steep angle. Pit showed rain crust 100-140cm down from surface. No movement on column tests. Rain crust 30-40cm thick. Forecast for persistent slab confirmed to exist.

Avalanches: During decent through Christmas Tree basin from Roaring Ridge. Avalanche triggered snowboarding down a steep aspect near steep cliff/rock features. North facing aspect, approx 4600 ft elevation, approx 45 deg inclination. Cracking observered when rider passed through area and slab released with an approximate 18” crown. Debris was funneled into small area and rider was partially buried. Video available. I do not have

Feb. 17, 2019, 2 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Nate Hough-Snee

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Blewett Pass

Route Description: Recycled our skinner and skied and ascended various northerly aspects from 3400' to 5300'.

Weather: Clear day with overcast skies building and eventual easterly winds and light snowfall.

Snowpack: HS +/- 100cm around 5k'. Significantly less snow low and on south facing terrain. Ski quality getting low on southerly aspects. Collapses under foot, skiing and skinning, even where tracks already were. All collapses on facet layer 20-40cm down that were buried in the last storm cycle. Surface hoar forming on most open, cold slopes.

Avalanches: No avalanches, but collapsed multiple slopes between 3400' and 5000' today (again). Considering that we're five days out from the storm cycle, structure is bad in all test locations, and collapses are still occurring on everything from yesterday's ski slopes (which had already collapsed) to flat meadows, there is still a considerable persistent weak layer hazard in the East Central Zone. The only redeeming quality of the structure around Blewett Pass is that the slab is shallow (20cm or less) or very uncohesive in many places, leaving little weight to move once the weak, faceted layer collapses. It's not a time where we were willing to try to outsmart the problem so we found good aspects and moderate ridgelines, and skied nice, cold snow on 30-degree slopes.

Feb. 17, 2019, 2 p.m. PST

Region: Stevens Pass
Observation by Kyle Hornor

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Big Chief Mtn, 4,800, W Aspect

Snowpack: Fcr layer Down 85cm. Ectx. PST 35/100 End.

Avalanches: No

Feb. 17, 2019, 1:15 p.m. PST

Region: Snoqualmie Pass
Observation by Trevor Kostanich

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Alpental Valley

Route Description: Traveled up backcountry travel route to Source Lake (crossing back to SW side of creek just below Source Lake) then climber's right side of Big Trees to bottom of Pineapple Basin. Descended same route.

Weather: Broken skies, calm to light/variable winds, no precip.

Snowpack: Snow immersion hazards remain in all terrain. @4440' NE aspect bottom of Pineapple Basin: rain crust down 155cm with ~15cm rounding facets above crust. Crust only pencil hard here versus knife/ice recently observed at lower elevations around Snoqualmie Pass. DTH SC down 150. See attached profile photo for more info.

Avalanches: A highlight of the day: Alpental Pro Patrol gave our AIARE 1 students multiple high quality obs. @4050' N/NE aspect (above Sunshine Wall in Alpental Back Bowls) SS-AE-R2-D2.5 times two. Both artificial triggers (assume 50lb anfo bag with hand charge buried in snow) pulled out ~1m deep X 30m wide soft slabs on convexities. Also noted natural avalanche across the valley, above summer trail, @~3800' SW aspect on convexity with much wider propagation (assume during natural cycle Tue night/Wed). Natural cycle Tue night/Wed was much smaller than expected, especially above tree line.

Feb. 17, 2019, 1 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Dallas Glass

Did you see any avalanches? Yes
Did you trigger any avalanches? Yes
Was anyone caught in an avalanche? No

Area Description: East Peak, Cement Basin,

Route Description: Bullion Basin trail to East Peak, uptrack. Cement Basin to 6000'. Return via NW aspect on East Peak

Weather: Mid-level clouds 5000-6200'. Scattered to Broken skies above. Temps cold in the teens. WInds Light SW. No precip.

Snowpack: 20cm of new snow in the last 24hrs. Upper snowpack generally increasing resistance and void of any significant layering. Wind affected snow near ridgecrest. Very localized. Thin wind slabs 15-25cm thick. 2/8 FC found 70-130cm below the snow surface. FC showing signs of rounding and grain to grain bonding. Snowpack test failing with sudden results.

Avalanches: We were able to trigger a very small wind slab, 15-20cm deep, 20' wide with a small cornice drop. SS-ACi-D1-R1-N 6600, E, 38 Numerous small loos dry avalanches on steep treed terrain NW-N-E aspects. L-AS-D1-R1-N 5400-6600'

Feb. 17, 2019, 1 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: 0 to 10 degree slope cleared area on the lake side of Cedar Brae road

Route Description: Walking on the flat area/ digging in the snow

Weather: Sunny 35 degrees

Snowpack: Weak layer about 20 to 30 cm down firm icy layer 60 cm to ground

Avalanches: 4 collapses experienced with in a hour. One collapse shook snow off of a few nearby trees

Feb. 16, 2019, 6 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Lake wenatchee

Route Description: Sub 30* terrain all day, 4K-5.8k feet.

Weather: Valley fog, broken high clouds above with several hours of very hot sun breaks.

Snowpack: 80-100 cms settling storm snow over 2/2 crust. Continuous loud whoomphs throughout the day, in the trees and on open slopes above.

Avalanches: Large natural avalanche remains from 2/12-13, propagating widely across terrain features.

Feb. 16, 2019, 2:30 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Aaron Richards

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Route Description: Toured around to the east side of Alta Vista and then up to 5700’ on the southeast shoulder and back to Paradise.

Weather: Overcast most of the day with a few moments of obscured sun. Enough to cause significant settlement in top 5-10cm. Moderate snow most of the day with 1-2” accumulation. Winds south light to moderate.

Snowpack: Lots of variation of depth of snow above 2/3 MFcr 80-150cm from Paradise up to ridge. At 5700’ on the southeast shoulder of Alta Vista had an ECTP24 down 80cm on facets above 2/3 MFcr.

Avalanches: Old crowns visible across valley on Mazama Ridge below trees.

Feb. 16, 2019, 2 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Mike Rolfs

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Below Squilchuck State Park, on North facing low angle open slopes around 2700 feet.

Weather: Calm, 28F, clouds from 3500-4500 feet. We were below the cloud. No precip.

Snowpack: 95cm total height snow, 8" ski penetration, 16-24" boot penetraion. 24" storm snow over 40cm old snow. From the ground, ice crust at 20cm and degraded ice crust at 40cm with loose crystals, mostly air under each crust, then 45cm settled storm snow from 2/8-2/9 on top of upper crust. This area was calm during the storm and the snow fell straight down and was roughly 75cm one week ago, settling to 45 cm today. Compression tests at two locations on the low angle meadow (15 degrees), failed at tap 10 at one, and at tap TWO at second. Failed at 50cm from surface below upper degraded ice crust on loose ice grains. Column moved 1/2 inch but did not propagate further. Widespread predictable whompfing on the low angle slope. Echos and physical vertical drop felt. None of this was observed on steeper angles in the trees. Less old snow found on steeper angles. Unable to break upper crust with compression test on steeper slopes. I thought Matt Primono's Wenatchee video didn't apply to my backyard near squilchuck because the snow fell without wind, but I was wrong. Similar problem at 2700'.

Feb. 16, 2019, 2 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Nate Hough-Snee

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Blewett Pass

Route Description: N to W slopes 3600' to 5100'

Weather: Sunny day turning cool and overcast and then back to sunny from AM to PM

Snowpack: Structure is bad. The recent storm snow has been buffed by wind and temp fluctuations along the ridges leaving a mix of windboard, 1F packed grains, and scoured surfaces high and settled powder in the trees. The one thing in common is 5-15cm of facets below the Feb 1 crust. HST 20cm, HS 100cm. 4F/1F slab on top of fist facets under the Feb 1 crust. ECT 14N on 1+mm facets 22cm down. CT15 Q1 sudden collapse on same layer. Basal 2mm facets not responsive but quite weak. Widespread collapsing and some localized cracking during travel. Collapses ranged in severity from "Boom shaka laka" in the NBA Jam arcade game to subtle. A couple had a radius of 25m.

Avalanches: Spun in crown on north WS-N-N1-D1 on a steep micro feature. Probably from +/-14 Feb

Feb. 16, 2019, 2 p.m. PST

Region: Olympics
Observation by Gabe O'Leary

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: south facing slope below the visitor center

Route Description: ran laps on the low angle open slope below the visitor center

Weather: partly cloudy in the morning to socked in and snowing an inch an hour in the afternoon

Snowpack: CTM SC 65cm ECTP 25 SC 65 cm

Avalanches: lots of crowns visible on various aspects

Feb. 16, 2019, 1 p.m. PST

Region: Stevens Pass
Observation by Alexis Alloway

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Lanham Lake environs

Route Description: Made several laps on N/ NW facing forested slopes between 4000'-5600'.

Weather: Clear skies in morning became broken by afternoon; calm winds all day; temps in high 20s; no precip.

Snowpack: We observed surface hoar (,5cm-1cm) on the snow surface in open areas between 3600' and 5600'. Several hand shears revealed a very poor snowpack structure (3 cm of 1-1.5mm facets atop MF crust) about 65 cm down. Hand shears failed with moderate to hard force on the facet layer, sudden planar. On N and NW aspects, we experienced dozens of small, localized collapses in the trees. A test pit (N aspect, 5300') produced ECTX and PST 35/100 (End) down 63 cm on the facets above the MF crust.

Avalanches: None observed in the immediate area

Feb. 16, 2019, 1 p.m. PST

Region: Snoqualmie Pass
Observation by Ketner & Rusty Lappeholland

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Cold Creek, Snoqualmie Pass

Route Description: John Wayne Trail to Christmas Tree Bowl/Roaring Ridge

Weather: Inversion to partly sunny to overcast to snowy

Snowpack: West facing pit at 4100 ft, HS 305cm. CT 22 Q2 sudden collapse, 130cm down, just under the rain crust (2/2?), loose melt/freeze grains. ECTX. Shovel shear on the extended column fractured 120cm down, just above rain crust on flattened buried surface hoar that was non-reactive in tests. No red flags noted during travel.

Avalanches: N/A

Feb. 16, 2019, noon PST

Region: Snoqualmie Pass
Observation by Dallas Glass

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Snoqualmie Mt, Phantom Trees

Route Description: Phantom Trees to ridgeline with Thunder Creek basin. Return via the same.

Weather: Broken skies in the morning became thicker. Very light snow showers as we exited the field. Temps were mild. Winds very light out of the S.

Snowpack: Below Treeline 90-120cm of snow over 2/3 MFcr. Recent snow showed no obvious signs of layering. Well settled with increasing resistance. Near Treeline 110-130cm over 2/3 MFcr. Facets rounding and bonding, but still weak at 4900'.

Avalanches: No new avalanches observed. Several older crowns still evident. Some minor sluffing and roller balls on steep sunny slooes.

Feb. 16, 2019, noon PST

Region: Olympics
Observation by Sam Luthy

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Maggies area to West Flank of Mt Angeles

Route Description: Tour from Maggies pullout along ridge to Mt Angeles. Ski decents into Superbowl, West Angeles Glades and Silver Fir.

Weather: Broken clouds with a light SW wind. Temps were at freezing for the duration of the tour.

Snowpack: Good skiing was had along the tour with cold soft snow in trees and N-E aspects. Slight warming crust on S-SW faces. 2-4mm surface hore was observed in open areas on all aspects, primarily in glades and along ridge tops. One collapse and "wumph" on the transition from the top of Silver Fir to begin the climb up on the flank of Mt Angeles.

Avalanches: No new avalanches were observed, however more crowns from the Tuesday cycle were observed.

Feb. 16, 2019, noon PST

Region: Stevens Pass
Observation by Katie Johnston

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Route Description: 4200ft to 5400ft on mostly northerly aspects from the Stevens Pass Ski Area towards Susan Jane Peak

Weather: Clear and Sunny in the morning increasing clouds becoming overcast by noon

Snowpack: experience widespread collapsing throughout the day

Avalanches: Evidence of a large natural avalanche cycle, probably occurring on Feb 12th. Multiple old crowns on a variety of aspects in steeper terrain, 1-2' deep

Feb. 16, 2019, noon PST

Region: Stevens Pass
Observation by Kyle Hornor

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: NW Aspect, 3,400-5,000 feet Yodelin zone

Route Description: Yodelin parking lot to pt 5,273. Nw-N Aspect

Weather: Clear in Am, Broken by Pm. No precipitation, little to no wind

Snowpack: 10 mm SH in spots. Dug two test pits, 30 feet apart. Pit 1: Facets down 80cm, crust down 85cm Ectp 25 down 80cm on SH Pit 2: Same structure Ectx

Feb. 15, 2019, 5 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Shane Robinson

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: The backcountry around Crystal Resort.

Route Description: Traveled on mostly westerly and northerly aspects in the 5000-6800’ range.

Weather: Snow flurries started in the afternoon and last for a couple hours, but most of the day was sunny with few to scattered clouds. Moderate winds died down to mostly calm winds in the afternoon.

Snowpack: Mostly wind affected snow along the ridgelines with more unconsolidated and dry snow BTL and in more sheltered areas. No instabilities notes except for the obvious wind affected and wind loaded snow.

Avalanches: None observed.

Feb. 15, 2019, 4 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Nate Hough-Snee

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Windy Knob N to 5700'

Route Description: N/NE slopes ~30-degrees

Weather: CLR, no precip, light W wind, no transport.

Snowpack: HS120-135 cm. Facets under 1 FEB melt-freeze/rain crust 20-40cm down to 2mm. CT11 Q1 sudden collapse on this layer. Recent storm snow was wind affected and had varying density (HST 20-40cm). Basal facets 2-3mm.

Avalanches: Diamondhead naturally slid at 5800’ on a NE 40-42 degree slope HS-N-R1-D2. Likely happened late Wednesday or Thursday as debris appeared spun in.

Feb. 15, 2019, 4 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Jeremy Allyn

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Crystal backcountry

Route Description: Bullion Peak NW Ridge - Crown Pt

Weather: Scattered-broken skies with periods of sun and good vis giving way to light snow by early afternoon. Warming (to 32F) tangible at the snow surface below treeline

Snowpack: 15cm of soft 24hr snow on surface. Average snowpack structure above 2/3 crust is F-4F-1F-4F. Ski pen 40-45cm, foot pen 75cm. Stiffer mid pack wind slabs are heavily terrain dependent and difficult to ID now, esp at mid elevations. Major E wind events on 2/9 and 2/14 drifted deep storm snow thru gaps and along ridges well into below treeline. Depths to the 2/3 crust varies widely from 55-145cm. Surface Hoar from 2/10 unreactive and no longer evident in snow profiles. Weak grains above and below 2/3 crust giving inconsistent results in small and large column tests on W-NE asp, 5600-6200, but trend continues to indicate rounding and strengthening. Colder, sheltered terrain below 6000ft where this crust is <75cm down seem most suspect for isolated large persistent slabs.

Avalanches: No recent or older avalanches observed

Feb. 15, 2019, 2 p.m. PST

Region: Stevens Pass
Observation by Keith Young

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Stevens pass 3700-4900,yodelin area but not the typical trees,north facing slopes 25-35 degrees. LOTs of loud ,tree rattling whummpf’s. No cracks and no slides. We were out on Wednesday also ,same general area. It was worse then.

Feb. 15, 2019, 2 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Brian Ellison

Did you see any avalanches? Yes
Did you trigger any avalanches? Yes
Was anyone caught in an avalanche? No

Area Description: Chumstick Hwy mile 8 NE ridge 1600-3100ft

Weather: Mid 20s with a mix of sun, light rain, and heavy snow. Trees beginning to drop snow.

Snowpack: Loud collapsing on exposed valley floor Pit 1 NE aspect 1600' Small 37° rollover on 27° slope 66cm total w/ crust at 33cm CT 10-14 planar sheer above crust Med-low energy 3x tests Collapsing at all elevations on all north aspects Pit 2 N aspect 3000' Small 38° rollover on 27°slope 76cm total w/ crust at 46cm CT12 within storm layer CT14 crust CT13 Med-high energy 2x test

Avalanches: Very small test slopes remotely triggered from bottom with visible cracking and snowpack shifts. Small rollover broke free at feet. Avalanches are certainly possible and likely even at valley floors. Please exercise caution when traveling on logging roads.

Feb. 15, 2019, 1 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: 3.5 miles west of Blewett Pass, 3600'-4700'

Route Description: Toured North for 1.5 miles off of hwy 97, starting 3.5 W of Blewett Pass Started skinning from car at 3650' Highpoint for the day was a large rock outcropping at 4650' on a ridge that trends w-e.

Weather: Mostly sunny 12:00-15:30. Intermittent sun, clouds and flurries 15:30 onward. Light to moderate winds from sw, I think...

Snowpack: Snowpack depth varied from 1'- to 4'+. Thinner on E and S aspects, deeper SW to N. ECT performed at 3800', SW slope: ECTP (21) Q1 Failed on facets sitting on thick crust, approx 2.5' from surface. Snowpack at this site was approx 4' deep.

Avalanches: Constant whoomphing throughout the tour. No signs of natural avalanche activity. Was not able to trigger avalanches on skis, on 35-degree slopes and greater.

Feb. 15, 2019, 12:30 p.m. PST

Region: Stevens Pass
Observation by Alec Wagner

Did you see any avalanches? Yes
Did you trigger any avalanches? Yes
Was anyone caught in an avalanche? No

Area Description: Steep old growth near stevens pass

Route Description: East facing Slope ~4400'

Weather: Mostly Clear

Avalanches: 1' crown x 75', remotely triggered

Feb. 15, 2019, noon PST

Region: East Slopes North - Canadian Border to Lake Chelan
Observation by John Box

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: NE Aspect 3000-6000 ft elevation Northwest of Mazama

Weather: Very light snow coupled with warming as day went on.

Snowpack: Woomphing was observed from ~3500 to 4500 ft elevation. Extended column tests failed with shear quality 1 and 2 at the faceted layer down ~30cm. Failures occurred at ECT12 and ECT15 in separate pits in different locations. No results were found at deeper layers.

Feb. 15, 2019, 11 a.m. PST

Region: Stevens Pass

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Chief Mtn NE aspect

Route Description: 30-degree forest 10T 644434 5289918 WGS84

Weather: Overcast, calm w/ warming trend

Snowpack: Wind and settlement is improving density profile and ski quality. Probing with ski pole found hardness steadily increasing to ~2' down, then ~3" of lighter snow, then the crust.

Avalanches: None observed. Heard collapse and settlement of snowpack.

Feb. 14, 2019, 5 p.m. PST

Region: Snoqualmie Pass
Observation by Jeremy Allyn

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Alpental Valley - Source Lake

Route Description: Source Lake via preferred route. Completely avoided open slope by the waterfall. Returned same

Weather: Slight warming to upper 20s, no precip in morning with decent, mod-strong gusty E-SE winds with mod-intense blowing snow and wind transport near treeline.

Snowpack: Height of storm snow over the prominent Feb 2 crust is 120-15cm near Source Lake. Very little notable structure or shears within top meter. Ski pen 40-45cm, foot pen 70cm+ (to the crotch). Open slopes below treeline were getting slightly wind affected. Mid elevations getting heavily wind affected with strong wind transport, drifting and building wind slabs

Avalanches: 2 notable slabs from last 24hrs with moderately wide propagation. One size 2 persistent slab (crust evident at bed surface), SW, 3800ft, 80-100cm thick, convex treed feature directly above Snow Lake Summer trail across valley from Trash Can. One size 2 wind or storm slab, NE, 4400ft, 80-100cm thick, convex roll upper Unicorn right below Draft Dodger ridgecrest. Numerous size 1-1.5 older slabs in hanging terrain on both N & S sides of valley. One older large-very large slab in bowl below Chair's East Face, approx 5700ft, unknown size and date. Also, 2 large slabs to size 2 observed East of McClellan Butte - one above Alice Creek and one near Gardner, NE asp, 3200-3800ft, unknown date

Feb. 14, 2019, 5 p.m. PST

Region: Snoqualmie Pass
Observation by JOHN BARKHAUSEN

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Source Lake Trail

Route Description: I was coming down the trail towards the parking lot. I had been up checking out the ice climbing at Kiddie Cliff.

Weather: Lightly snowing. Obviously, there was a lot of new snow.

Snowpack: I didn't dig, but there was a lot of new snow. I didn't feel any whumpfs or see any cracking. I didn't see any wind transport although I didn't get very high.

Avalanches: I saw one avalanche, looked like maybe a natural unless Alpental controls the west (northwest?) side of the drainage. It was fairly low, on steep slopes across from the trail. It looked like it was all storm snow. I attached a really bad picture, but you can see the crown.

Feb. 14, 2019, noon PST

Region: Stevens Pass

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Chief Mountain, E of ski area boundary

Route Description: Highland Shoulder

Weather: Overcast, wind E and strong

Snowpack: Cross-scoured and wind-hammered on the 30-degree shoulder. Lots of cracking. Noticeable density inversion with about 3" of very light snow right at the crust, about 2' down. Too windy to hear whumping but heard plenty in the low-angle trees below.

Avalanches: None seen. Poor visibility.

Feb. 14, 2019, noon PST

Region: Snoqualmie Pass

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: (Posted again because photos attached did not appear) I 90 exit 42- 47 Observed large crowns from naturals on w-nw aspects 3200'-4000', one on the N shoulder of the duke/duchess of kent (close-up photo) and others at similar elevations and aspects further E into the corridor. Granite's S ridge had some evidence of slide activity, but strong E winds were quickly covering this up. It was difficult to identify any evidence of slides on Granite's W wall/basin (photo). You could almost watch the snow build on W aspects from the strong E winds. Intense.

Weather: E winds, Sun-Clouds intermittent, Snow plumes constant on ridge tops down to tree line

Feb. 14, 2019, 11 a.m. PST

Region: Stevens Pass
Observation by Jerome Drescher

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Yodelin

Route Description: Skinned to the top of the Yodelin tree runs. Skied down Yodelin tree runs avoiding the steeper faces.

Weather: Light snow, heavy wind

Snowpack: We dug a pit at the top of Yodelin trees, in a sheltered area in old-growth forest. The pit was at about a 10 degree slope. We did a CT test (failed at 17 on the facet layer above the crust ~65cm down) and ECT test (failed at 15 on the same layer with propagation through the entire column, see picture). We also observed an upside-down snowpack, with a fist hardness layer below a 1-finger hardness layer at about 15cm down.

Avalanches: We didn't observe any avalanches. A ski cut on a small isolated steeper feature resulted in cracking but didn't result in any significant snow movement (this may have been due to insufficient slope angle/length).

Feb. 14, 2019, 11 a.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Paul Przybylowicz

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: SW face of East Peak

Route Description: Took skiers trail up to Bullion. Broke trail entire way, about 2-3 ft of fresh snow

Weather: Broken clouds initially around 8, strong east winds, gradually got cloudier and started snowing. Wind shift to SW during AM. Snow increased in intensity throughout day, winds remained strong.

Snowpack: Dug hasty pit at 6,200 ft, slightly over a meter to the old consolidated snowpack. Shovel tilt test did not reveal any obvious weak layers in fresh snow layers. Wind slabs were encountered, in more wind-exposed areas, up to 8 cm thick, several areas had multiple thin slabs within the top 10 cm of new snow. Wind slabs slid on fresh snow in skin track turns. Significant wind transport of snow observed and snow surfaces were scoured. Quality snow to be had among the trees, but didn't ski the steeps.

Avalanches: none observed

Feb. 13, 2019, 6 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Matt Primomo

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Icicle Creek

Weather: Moderate snow showers in AM giving way to broken skies and sun. No wind transport. Solars got crusted, perhaps some radiation recrystallization in places.

Snowpack: Horrible structure, as bad as it gets. 2200-3200ft on north half: Slab 50-70cm. Blower pow increasing in harness to 1f+. This sits over 5cm of 4f facets (1.5mm) over a 5-10mm thickness clear freezing rain crust, hollow underneath in many places. Sometimes supportable on foot, sometimes break through. Foot pen up to waist, up to chest if breaking through the crust. Widespread and predictable collapsing on low angle slopes.

Avalanches: Observed roughly a hundred recent crowns in the area with incredibly wide propagation. Much of the activity (that I could see) was on the north half of the compass and below 5,500ft, though observed slabs on all aspects and elevations. Slides to D3. One covered the old forest service road with a few 10” diameter trees in the debris.

Feb. 13, 2019, 3 p.m. PST

Region: East Slopes North - Canadian Border to Lake Chelan

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Up Delancey Ridge for a quick look-see.

Route Description: Toured to 5000' and dug quick pit on S aspect.

Weather: Temp 28 degrees. No wind, scattered clouds, sun out and warm; quickly formed a crust on sunny faces.

Snowpack: Abundant whoomphing noticed from collapsing facet layer down about 32cm. Shovel tap test performed. Top 3cm (snow from clearing storm last night?): very easy (CTV). Facet layer (32 cm) mentioned in the avalanche forecast: Easy (CTM). Also observed snow pasted to N side of trees, even down low (from recent higher winds?)

Feb. 13, 2019, 1 p.m. PST

Region: East Slopes North - Canadian Border to Lake Chelan
Observation by Nicholas Monro

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Cutthroat Drainage Environs.

Route Description: Toured up the summer trail to a south facing rib just prior to Cutthroat lake, and adjacent to Cutthroat Pass. On exit crossed drainage and briefly skied low angle north aspect glades.

Weather: Broken clouds, with the sun making numerous appearances. Wind was primarily calm and terrain influenced down lower in the drainage, noted some snow transport off ridge-lines with a westerly wind up higher. Cooler air temp in the valley bottoms, moderating some as elevation was gained and the day progressed.

Snowpack: Upon skinning off the flat summer trail and gaining elevation and sun exposure, noted numerous and audible whumph collapses and settlement, with the recent storm snow gaining a slab structure with the sun and warming temperature. Testing small rollovers in the terrain as I climbed, the upper snowpack readily slid in a cohesive slab structure. It was time to dig. 5,300 feet, SE aspect, 30 degree glade slope. HS 200cm. HST 50cm. Propagation Saw Test: PST 30/100cm (End) failing on 1.5mm facets above a 1.5 cm sun-crust 50cm down. Shear Quality 1. Sudden planar fracture, clean shear with energetic release on this weak layer. Extended Column Test (same location) ECTP 11. Again Shear Quality 1 with a sudden planar fracture, with the block sliding readily on the weak layer in question, the same facets over a crust 50 cm down. Briefly crossed the drainage on my exit to ski low angle north glades, with a lower density and unconsolidated upper snowpack/recent storm snow. No instability was noted there. Also noted some surface hoar growth in the protected drainage bottom and up to 5,500 feet north aspect, especially in more sheltered open areas. Near surface facets found on more southerly aspects with a thin sun crust or moist surface snow beginning to take shape as I left.

Avalanches: Noted numerous avalanche crowns in steep unsupported northerly facing terrain surrounding the drainage, with some small loose dry observed as well on north facing terrain. Appeared like a natural cycle of sorts occurred with this most recent storm. South aspects were seeing the effects of the sun, with numerous point release loose wet observed.

Feb. 13, 2019, 12:45 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Al Hernandez

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Wenatchee Mountains just north of King Creek.

Weather: Party cloudy then cloudy.

Snowpack: Dug a pit right around 3,800’ on the top of a slope with a N/NE aspect. Found a weak layer of faceted snow about 3’ down. Pit test showed the slab failed on the weak layer on the 4th tap.

Avalanches: Saw some small storm slabs with crowns of about 1.5’.

Feb. 13, 2019, noon PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Nate Hough-Snee

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Icicle Creek to 3200', north aspects low on Mt. Cashmere. This is an addition to Matt Primomo's obs. https://www.nwac.us/observations/pk/3990/

Route Description: Icicle summer road to Doctor Creek approach

Weather: Cool (-5C), BRK to CLR, S1-S2 and then no snow. Light winds, no transport. Nice day to see the carnage.

Snowpack: As Matt mentioned, strange things were afoot at the Circle K. a solid 2cm+ of facets on the 1 FEB 1-2cm+ rain crust produced a widespread avalanche cycle on northerly slopes in the below and near treeline bands. Rumbling collapses during travel below treeline.

Avalanches: Main slides of note (of ~a hundred): A D2.5 (D3?) ran low across the summer road (~2700') from a start zone 1.5k' higher on Cashmere. Any slope with a northerly tilt and sufficient angle to slide naturally did. More snow will continue to test this weakness as the recent snow forms a more cohesive slab. Pictures below.

Feb. 12, 2019, 6 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Matt Primomo

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Dry Gulch, Wenatchee Foothills

Weather: Overcast, mid 20s. Light wind, recently transported snow but not observed in the afternoon

Snowpack: Poor structure, persistent slab on W-N-E aspects check the vid here : https://www.instagram.com/p/Btz0miSBfm_/?hl=en

Avalanches: Reports around the Stevens Pass to Snoqualmie zone of a widespread cycle on facets over a crust, details and visibility still limited. Natural slab avalanche off a steep NE facing slope in the foothills, starting at 1800ft, running to appx 1500ft. 40cm deep x 30m wide. Ran on the February 8th layer, in this case it was a facet/crust matrix with the upper crust being thin, friable, and decomposed. Also spotted two naturals on the drive out of Leavenworth. One was over 50m wide on the sandstone slab above Hwy 2. The other was a roadcut from plow. Both of these ran on facets. Low elevation persistent slabs are in the picture, and it’s very real.

Feb. 12, 2019, noon PST

Region: Snoqualmie Pass
Observation by Grant Shaver

Did you see any avalanches? Yes
Did you trigger any avalanches? Yes
Was anyone caught in an avalanche? Yes

Area Description: Roaring Ridge ski tour. Coming down through Xmas Tree Bowl.

Snowpack: 10" fresh light powder on top of icy crust of snow.

Avalanches: One member triggered a 10" deep wind loaded slab avalanche on 25 degree descent. He was able to stay on top of it through the mild runout.

Feb. 12, 2019, noon PST

Region: East Slopes North - Canadian Border to Lake Chelan
Observation by CB Thomas

Did you see any avalanches? Yes
Did you trigger any avalanches? Yes
Was anyone caught in an avalanche? No

Area Description: Delancy Ridge East

Route Description: Climbed ridge just west of Silverstar Gate to ridge top.

Weather: Snowing S1

Snowpack: 6+” new over 1.5cm crust. In open glades, we found up to 18” of snow over crust. New snow was not low density blower but wasn’t cohesive slab yet either.

Avalanches: Significant settling with remote small soft slabs releasing on steeper rolls during ascent. 6”-8” soft slabs released and propagated on crust and rocky outcrops when slope angles exceeded 30 degrees.

Feb. 12, 2019, 11:25 a.m. PST

Region: Mt Hood
Observation by Alexander Vasarab

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Trillium Lake, 4085', ESE aspect

Weather: X sky, C wind, S1 precip

Snowpack: HS 115cm, HST 70cm Snow felt denser and more cohesive than yesterday.

Avalanches: None observed, and was unable to trigger anything with skis on test slopes.

Feb. 11, 2019, 5 p.m. PST

Region: Snoqualmie Pass
Observation by Jere Burrell

Did you see any avalanches? Yes
Did you trigger any avalanches? Yes
Was anyone caught in an avalanche? No

Area Description: Kendall, stump, knob, trees, commonwealth

Route Description: Kendall, stump, knob, trees, commonwealth. Caution advised on recently buried open creeks, trees and stumps along with deep snow immersion hazards.

Weather: Snoq all day with increasing and heavy S2- S3 precip rates and moderate winds efficiently transporting new snow in the afternoon.

Snowpack: Snowpack obs displayed weak planar fracture character at the 2/10-2/11 interface. Instabilities increased rapidly with active windloading and heavy precip. NTL: 5100’ E-S-W aspects windslabs were developing in near ridgline terrain on lee and sheltered aspects. Several shooting cracks were triggered in the afternoon with one small release 5” x 12’ x 20’. This slid about 12” down hill on a 30 degree slope. Storm snow totals ranged from 24”-32” with the deepest being in open treeless west facing slopes @ ~5,000’. This snow rested on a thin crust 5-10cm above the stout 2/7 or 2/8 crust.

Avalanches: BTL: Natural loose dry is steep unsupported terrain adjacent to the waterfall in commonwealth basin. This small slide covered the skin track. Numerous and widespread natural slides were observed on steep convex rolls in all areas of commonwealth basin. These were all 5” deep and with in the new snow that fell during the day. One of these was nearly a remote trigger (very touchy). Attached photo.

Feb. 11, 2019, 2 p.m. PST

Region: Snoqualmie Pass

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Snoq pass

Snowpack: Dry and deep. New snow was sluffing on steep slopes, hard crust beneath it. No consolidated slabs in below tree line terrain. All lower angle slopes were bottomless pow. Oh the blessings of winter.

Feb. 11, 2019, 1:45 p.m. PST

Region: Mt Hood
Observation by Alexander Vasarab

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Frog Lake, forested terrain, 4450’ E

Route Description: Ridge W of Frog Lake

Weather: L out of W wind, X sky, -1.5 C air, S1 precip

Snowpack: HS 130cm, HST 60cm, PF 50cm, PS 35cm CT13 down 35cm (Q3, BRK) CT15 down 50cm (Q1, SC) Lots of great new snow but some reactivity within it. I was surprised by the planarness of the CT15 result but didn’t test again elsewhere due to lack of time. The crystals on the bottom of the block looked like DF and not facets or surface hoar. In a sparsely trees, flattish area.

Avalanches: None observed.

Feb. 10, 2019, 5:30 p.m. PST

Region: West Slopes North - Canadian Border to Skagit River
Observation by Lee Lazzara

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Route Description: Table Mt tour

Weather: Sky quickly clouded over around 11:00 with light snow beginning at 13:00 - light wind transport starting mid-morning.

Snowpack: Highly variable snowpack NTL + ATL this region. N + E aspects very wind scoured out, elevated tracks, wind runnels, etc. Very firm snow surface with stubborn wind slab only on cross loaded, highly featured terrain. S + W have patchy wind slabs yielding easy results with hand shears (could generally not isolate columns with pole), ski cuts, etc. Wind slabs sitting on thin, weak 2/8 MFcr - most locations on these aspects FC's above and below - lots of variation with FC going from small grained mixed forms to 2mm FCsf. ECTP @ 2/8 layer on reported avalanche crown. Below 2/8 spx is alternating layers of rounds and MFcr - all observed to be well bonded. Reported avalanche did not step down into deeper layers.

Avalanches: Another party nearby remotely triggered a D2 hard slab today (SW @ 5200' - 45deg - 30-70cm deep x 150' wide) failed on facets around 2/8 melt freeze crust. Also report of human triggered D1 (Barometer Mt - west aspect just below ridgeline on 2/8 crust). About a dozen D1 naturally triggered wind slabs obs'd mostly W aspects NTL - one D2 on N/NW facing Table Mountain above Iceberg Lk. Suspect all ran during wind loading event. Photos of D2 avalanche should be on West-North forecast page and 'nwacus' Instagram

Feb. 10, 2019, 4:02 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by IMG Level 1 None

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Paradise Environs

Route Description: Near Alta vista, down to Edith creek basin, up towards Mazama ridge

Weather: Cloudy and snowing

Snowpack: A variety of wind affected snow, some scoured ridgelines and deep drifts (2' +). Storm snow remained unconsolidated in sheltered areas. A variety of whoomphs heard where hard windslab sat over weaker snow.

Avalanches: Some small natural activity from last night's storm cycle.

Feb. 10, 2019, 3 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Jamie Tackman

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Mission Peak

Weather: Clear skies, winds light and variable, temps estimated 25. Becoming overcast, winds out of the west 5-7 gusts to 20, snowing,

Snowpack: We tried to ski, but really walked low angle terrain. 42cm of new low density snow sitting on the old stuff. The new snow seemed to be right side up, and where we looked reasonably well bonded to the old surface. Don’t put too much on this, just one little sample in a big complex area.

Feb. 10, 2019, 2 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by MVB None

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Crystal BC

Route Description: Main travel route to Blue Bell. Descended W facing runs into Pick handle basin.

Weather: Clear skies, cold temps calm winds in the AM transitioning to broken skies, light snowfall and light winds in the afternoon. Temps stayed cold.

Snowpack: Wind drifts and loading down low on slopes up to bullion and up blue bell. West facing slopes in pickhandle off the ridges were mostly un-consolidated, surprisingly. Small test slopes around blue bell showed wind slabs stubborn to trigger. No cracking or whumphing observed. Surface hoar appeared intact throughout the day on W facing slopes into pickhandle.

Avalanches: None observed.

Feb. 10, 2019, 1 p.m. PST

Region: West Slopes North - Canadian Border to Skagit River
Observation by Kelsey Elliott

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Dug a pit on top of the ridge overlooking glacier pass SW aspect, Windslabs were obsterved on NE Aspects. Mount Baker

Route Description: Travelled through to horse Corelle to visit an old friend, stayed on height of land following along side the gully, conditions were like a highway. Super tracked.

Weather: Weather was bluebird until about 2pm when we got super socked in and the wind picked up to moderate

Snowpack: Dug a full profile pit on a south west aspect, although I did not get any results on a column test, there was a large prominent melt/freeze crust 10cms down and 4-5cms thick. As well, Faciting 70cms down 2-3mm in size. Many prominent layers in the pit

Avalanches: A few windslabs observed, human triggered size 2 24-48hrs old.

Feb. 10, 2019, 1 p.m. PST

Region: Snoqualmie Pass
Observation by Rusty M

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Alpental Valley

Route Description: Pineapple Pass

Weather: Started sunny and calm, became overcast with flurries and moderate winds by noon. Cold.

Snowpack: ~12-14 inches of cold powder on a variety of firm crusts. Some wind effect in the top few inches with very limited cracking, particularly in windswept open basins or near ridgelines. Quick pit revealed CTM Q2 failing under the storm snow on a thin layer of old snow/rounds sandwiched between a 2mm crust and the stout rain crust. Didn't find any NSF or surface hoar above the main crust in several hand pits ~4-5k'. Superb skiing on open, lower angled slopes.

Avalanches: No natural or human triggered activity observed.

Feb. 10, 2019, 1 p.m. PST


Observation by Charlie Hagedorn

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Snoqualmie Pass

Route Description: A delightful ramble out to Windy Acres.

Weather: Clear, sunny, and cold in the morning, becoming cloudy. Summits were in and out of the clouds by noon. Flurries began before 11am, snowing lightly after 1pm.

Snowpack: Fluff over X/C-ski-supportable knife/pencil crust, approaching boot-top in depth. Substantial evidence of wind transport, and windslab in many places. Soft windslab was present even well below treeline in spots. No cracking observed, which was a surprise, even in drum-head windslab. Quick hand shears in road cuts also found less instability than I'd have guessed.

Avalanches: Good visibility in the morning gave a great chance to survey the neighborhood for activity. In a first pass of the day's photos, I've found only one slab, in the eye-catching path stretching south from the sub-summit due south of Upper Kendall Lake. Fresh tracks following Granite's summer trail continue to make me nervous.

Feb. 10, 2019, 1 p.m. PST

Region: Stevens Pass
Observation by Brenda Hollon

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Yodelin, Peak 5023.

Route Description: NE aspect of Peak 5023 at 1 PM.

Weather: Air temperature 17.5 F, T10 13 F, overcast clouds, precip S-1, calm winds.

Snowpack: HS 240 cm, slope angle 26 degrees. CT13 SC down 21cm from the surface, and found .5 mm - 1 mm facets under a crust.

Avalanches: Did not see avalanches.

Feb. 10, 2019, 12:30 p.m. PST

Region: Snoqualmie Pass
Observation by Dallas Glass

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Kendal Peak/Commonwealth Creek.

Route Description: Ascent and descent via Commonwealth Creek. Travel through the main Kendal avalanche paths to the ridge separating the basin from Kendal Lakes.

Weather: Sky clear in the morning, quickly becoming overcast with very light snow showers. Winds were light and variable. No significant new snow accumulation.

Snowpack: HST: 30-35cm. Minimal settlement even on S-facing slopes. New snow over 1mm facets in many locations including below treeline. New snow and facets over a very firm and thick melt-freeze crust. Additional facets found in and under crust. Wind transport from East winds. Snow drifts failed even in thickly treed terrain.

Avalanches: Several small loose dry and storm slab avalanches observed. All likely occurred Friday night or early Saturday morning.

Feb. 10, 2019, 11 a.m. PST


Observation by Ben Johnson

Did you see any avalanches? Yes
Did you trigger any avalanches? Yes
Was anyone caught in an avalanche? No

Area Description: Mount Baker Backcountry, Heather Meadows.

Weather: Sunny in the morning, becoming stormy by afternoon.

Snowpack: We observed very sensitive wind slabs on South through West aspects near and above treeline. Small, wind loaded test slopes produced shooting cracks and collapses.

Avalanches: Our party remotely triggered a small (D1-1.5) wind slab from ridgeline on a southwest aspect near treeline. The crown was between 15 and 50 cm deep, and ran on a thin melt-freeze crust.

Feb. 10, 2019, 11 a.m. PST

Region: Snoqualmie Pass

Did you see any avalanches? Yes
Did you trigger any avalanches? Yes
Was anyone caught in an avalanche? No

Area Description: Kendall peak

Route Description: Up Commonwealth to the Kendall knob. Skied to the lower lake and toured through the lakes basin. Returned to the Kendall slide path side and did laps there.

Weather: Clear in the morning becoming overcast. Light snow throughout the day becoming moderate at end of day.

Snowpack: Main thing of note was significant wind effect in the Kendall lakes side of the area. Some surfaces were heavily scoured while nearby there were large wind pillows. This was bad skiing, so we changed our plans. On the other side of the knob, the W facing popular slide path had unconsolidated 12"+ of excellent powder. There were so many tracks it looked like ski resort sidecountry.

Avalanches: Triggered a small wind pillow on a S facing open slope skiing from the knob to lowest lake, D1 R1

Feb. 10, 2019, 11 a.m. PST

Region: Stevens Pass
Observation by Brenda Hollon

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Yodelin, 4250'

Weather: Tair 18.5 F, Tsurf 16 F, light winds, broken clouds, precip S-1, boot pen 41 cm, blowing snow not observed.

Snowpack: Heard a whumpf in low angle terrain near trees. Did CT test on NW aspect, slope angle 18 degrees. HS 220cm, boot pen 41 cm. CTV down 29cm from the surface, on crust/facet interface. Facets were .5 mm to 1 mm.

Avalanches: No avalanches observed.

Feb. 10, 2019, 11 a.m. PST

Region: West Slopes North - Canadian Border to Skagit River
Observation by Marvin Kim

Did you see any avalanches? Yes
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Herman Saddle

Route Description: Toured up to 5,100' towards Herman Saddle.

Weather: 24F at parking lot, clear skies in the morning, sky cover came in around noon and light snow started in early afternoon. Light winds out of S, opposite of the previous day.

Snowpack: Widespread wind affected snow from the parking lot on up. Test slope on a S aspect on the way up to Austin Pass had shooting cracks going out 3-5m from tips of skis on a small test slope (didn't get a great photo of it). Wind slabs varied in depth from thin to over 30cm in specific terrain. Overall, wind slabs seemed to be well bonded light cold snow below. Didn't see signs of clean planar breaks between layers. Some wind slabs were very stiff and skier supportable. Observed 1-2cm melt freeze crusts on slopes just above Upper Bagley Lake on S aspects, which was surprising given the cold temps. This crust is probably in zones where wind did not move the surface snow. New snow will likely not bond well to this cold crust.

Avalanches: Saw debris from one loose dry avalanche on N aspect on Table Mountain, likely skier triggered.

Feb. 9, 2019, 1:50 p.m. PST

Region: West Slopes North - Canadian Border to Skagit River

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Mt baker area near parking lot

Route Description: Enroute to summer visitors center

Weather: Scattered clouds with some sun and light winds from the northeast or north

Snowpack: Storm snow on top of form crust with evidence of wind transport and wind scouring

Avalanches: None

Feb. 9, 2019, 1 p.m. PST

Region: East Slopes North - Canadian Border to Lake Chelan
Observation by Andrew Philbin

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: West rib/ridge of Silver Star Mountain via sub-ridge.

Route Description: Mostly low angle (<30deg) trees and glades up to a point before main ridge steepens.

Weather: Overcast with periodic sun breaks. 11F at Silver Star Creek parking, possibly colder at the terminus of our route at 7300 ft. Gusty NE wind on road but tour route was mostly calm/wind protected.

Snowpack: Up to 15cm new snow over a sun crust that varied with aspect and altitude. New snow bonding poorly to .5-1cm of small-grained facets above crust. 5cm of larger (1.5mm) facets below crust was highly reactive. Multiple CTs failed on isolation on this layer. Extended column tests were similar at ECTP2 and ECTP4. Also stubborn but positive CT result on an older interface 70cm down (CT23, Q1). ECTN 27 as well on this interface, which was an older deteriorating crust with rounding facets above and below. Pit was dug on a slope with relatively small solar effect, but pit on adjacent solar slope had stouter crust and similar results. An isolated collapse was observed in a lower elevation open area. Most obvious instability was seen on a small roadcut that was heavily wind affected. Long, shooting cracks and larger sections of slab failing and sliding easily on facets atop sun crust. Other sections on tour route were mostly wind-protected.

Avalanches: None visible aside from rollerballs on S/SE facing terrain across Hwy 20, but visibility was limited.

Feb. 9, 2019, 11 a.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Jon Ferrian

Did you see any avalanches? Yes
Did you trigger any avalanches? Yes
Was anyone caught in an avalanche? No

Area Description: We rode snowmobiles out of Blewett Pass today and ride up the main trail and to Haney Meadow. Along the trail we saw many small Avalanches and when off trail we saw a lot of cracking of the snowpack

Route Description: Blewett Pass to Haney Meadow

Weather: Cold and windy and lots of snow falling all day.

Snowpack: Lots of fresh 1-3’ in various areas and all was wind blown creating wind slabs virtually everywhere. Wind was so strong we had trees falling around us whil we were out riding.

Avalanches: All very small but significant fractures everywhere. We avoided all Avalanche slopes and stuck close to the trail.

Feb. 8, 2019, 2:30 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: WIndy Knob

Route Description: N 5400', 25-degree slope adjacent to 30-degree slope

Weather: Snowing hard (S5), light wind, light transport, obscured sky, -8C

Snowpack: HS 125cm Fist storm snow over knife crust with 1mm facets below. ECTN14 13cm down on the facets. Several buried facet and surface hoar layers breaking up patches of rounds in the 22 distinct layers we encountered.

Feb. 7, 2019, 3 p.m. PST

Region: Snoqualmie Pass
Observation by Jeremy Allyn

Did you see any avalanches? Yes
Did you trigger any avalanches? Yes
Was anyone caught in an avalanche? No

Area Description: Snoqualmie Pass

Route Description: Up Snoqualmie/Phantom Slide Path - down N into Thunder Creek - west over Avalanche Mt - up and over Snow Lake Divide - out via Source Lake and Alpental Valley

Weather: Calm to light variable winds near treeline. Temps 11-28F with slight inversion and building high clouds

Snowpack: Widespread Surface Hoar observed from valley bottom to my high point of 5300ft, all aspects, especially W-N-E between 4000-4500ft, averaging 6mm. Snow Lake Divide N aspects had 2cm SH and very large near surface facets, as did parts of upper Thunder Creek drainage. Near treeline and in open low elevation terrain, this SH is sitting on 5-10cm of weak old storm snow over either our very thin rain crust from 2/2, or the old 20cm thick melt-freeze crust from our high pressure. Many aspects between 4000-5000ft have a double crust/weak snow combo with the 2/2 crust now wafer thin and faceting. In tight/closed forest below treeline, snow surfaces have remained very hard with recent light snow not really accumulating much.

Avalanches: Intentionally ski triggered a small Loose Dry while descending N into Thunder Crk at 5200ft. Ran ~250ft on smooth bed surface entraining very weak surface snow

Feb. 7, 2019, 3 p.m. PST

Region: East Slopes South - South of I-90 to Columbia River
Observation by Bradley Gasawski

Did you see any avalanches? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: Umtanum Creek Falls and surrounding area.

Route Description: I was exploring the Umtanum Ridge drainage area around 2400' to 3000' elevation just southwest of Ellensburg, WA. I hiked down to Umtanum Creek Falls as part of this adventure.

Weather: Sunny with a few scattered clouds mid-afternoon. Temps were cold, around 20 F, colder in the shaded creek drainage. Light wind higher on ridges or out in the open. No wind where the pictures were taken. We are expecting around 12" of new snow through the weekend.

Snowpack: 8" recent snow on top of a firm and shallow layer in the trees or on 2"- 4" breakable crust in open areas away from trees. Around 12" - 16" of snow in sun protected areas. On steeper south facing aspects, the snow was much thinner and softer. It appears that the only snow on these aspects was the recent storm layer, unless these aspects were well-shaded. With the recent cold temp's in the Ellensburg, WA area, surface hoar is developing, especially in shaded areas on top of this recent storm layer. This new snow is not bonding well with itself except in sun affected aspects. We'll see how the snowpack reacts to the new storm layer being added over the next few days. You can see from the pictures below that the surface hoar is much larger next to running water in creeks. The beautiful feather crystals in photo IMG_1563 vary in size from 1/2" to 3". These crystals grew to this size in a 24 hour period. (I was at the same location the day before at the same time of day, and the ice and feather crystals were not there. This area of the creek was not frozen and the water was flowing.) While the feather crystals are not this big away from the creek, I thought is was fun to share the photo and remind us how fast these crystals can grow when the conditions are right. If traveling in the Cascade East -South in the Ellensburg, WA area, the snowpack is shallow, the temps have been cold and the surface hoar is about to get buried with the new storm cycle moving into our area this afternoon.

Avalanches: None to report.