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Observations

Jan. 18, 2020, 4 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Christopher Mayer

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

Area Description: French Cabin Snowpark

Route Description: French Cabin South Fork

Weather: High cloud cover, light snow, calm wind Sky Cover:BKN Precipitation: S-1 Wind: Calm

Snowpack: Elevation: 3350 ft Aspect: SE Slope Angle: 24 degrees TEST: ETCX, CT8 PC@20cm, CT13 PC@23.5cm, PST100/100 END @67 Depth 144cm

Avalanches: Multiple D1/R1 storm slab releases, 20cm or less on Northern to Eastern aspects

Jan. 18, 2020, 12:30 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: Kendall Slide Path, 4900 ft, SW slope

Weather: OVC, L, S-1

Snowpack: HT 260 cm, height of snow on top of the 01/08 crust was 145 cm, 1-2" snow on a weak layer, snow consolidated in places to form a slab

Jan. 18, 2020, 10:30 a.m. PST

Region: Stevens Pass
Observation by Chris Seely

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

Area Description: Inbounds at Steven's pass resort

Route Description: Skiers left of the skyline lift

Weather: Light snow

Snowpack: Storm slab

Avalanches: Triggered a large crack when I came to a stop at slow speeds. Did a quick hand shear test that slid as soon as I cut the back.

Jan. 18, 2020, 10:30 a.m. 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: Snoqualmie North Aspects Near and Below TL 3000-5000ft

Route Description: Traveled in Old Growth forest on a North Aspect 3000-5000ft

Weather: Light Snow in the Morning tapering off in the afternoon. Slight cloud breaks at times.

Snowpack: Deep and Dry although less ski penetration than earlier this week. High quality ski conditions. Small density change around 10cm down. Relatively consistent and uniform below that.

Avalanches: Top 10 cm was surprisingly reactive. A small tap with a pole on any steep slope sent shooting cracks and a very soft slab. Ski turns on anything steep released very small very soft slabs almost like sluff. A natural crown likely from overnight near the ridge crest was 10cm deep and propagated ~200ft across small terrain features.

Jan. 18, 2020, 10 a.m. PST

Region: Stevens Pass
Observation by Matt Primomo

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

Area Description: Smithbrook

Weather: Light to occasionally moderate snow, becoming showery by the time we left at 11:00. Little to no wind in the trees.

Snowpack: Settlement within recent storm layers is apparent, as ski pen is down to ~45cm, as opposed to 60+cm a few days ago. ~20cm new snow below 5,000ft with obvious, 5cm thick layer of large, very low density stellars above the old/new interface. The most recent snow was rimed particles sitting above these low density stellars and made for very reactive, though shallow soft slab conditions. No obs from the NTL or ATL.

Avalanches: You could basically just look at a steep slope the wrong way and it would fracture. Incredibly reactive conditions with very wide propagations for such shallow and very soft storm slabs. Remotely triggered plenty of very small pockets on steep faces of snow pillows. Crowns were 10-15cm deep and very soft. Not very destructive, but continuous open and steep slopes could, and probably did produce small D2's.

Jan. 17, 2020, 6 p.m. PST

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

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

Area Description: Mission Peak

Weather: Light S winds, minimal drifting snow, cold with scattered skies and a fair bit of sun hitting the North Central Cascades.

Snowpack: Recent wind slab large, but stubborn and found in isolated to specific areas near ridgetops and on open slopes below outcrops or crossloaded features. Thin weak layers found to be gaining strength with inconsistent test results. Shallow and variable snowpack depending on aspect and elevation. Lots of wind effect, per normal for the zone. Plenty of rocky areas as well. Profile from ENE at 6,600ft on a mid slope rib feature tilting to the E.

Jan. 17, 2020, 4:30 p.m. PST

Region: East Slopes North - Canadian Border to Lake Chelan
Observation by NCMG AIARE Level 1 None

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

Area Description: Delancey Ridge

Route Description: Normal

Weather: Clear and cold AM with strong solar input. Increasing clouds PM.

Snowpack: Field HS: 120 - 175cm Recent HST: 45cm Test Pit at 6100' on S aspect showed the 12/27 surface hoar down 115 cms. Snowpit tests showed a decreasing trend in reactivity over the past week. A thin sun crust formed on solar aspects with PM cooling below 5500 feet. It was more pronounced on steeper slopes.

Avalanches: None observed.

Jan. 17, 2020, 4 p.m. PST

Region: Stevens Pass
Observation by Denis DuBois

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

Area Description: Yodelin

Route Description: Yodelin common route from lodge up road to knob, to saddle, west big trees, knob, back to lodge.

Weather: Partly cloudy at noon. Snowing lightly at 4:00. Near 27F all afternoon. Calm winds.

Snowpack: There is a lot of loose dry snow. At least 240cm at 5k ft. Skiing was fantastic. Fantastic. Powder is bottomless.

Avalanches: We skied steep trees and didn't trigger anything but shallow slough.

Jan. 17, 2020, 3 p.m. PST

Region: Olympics
Observation by Robert Williams

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

Area Description: Olympic - hurricane ridge- n &ne aspects (Maggie’s area) 5 4500 5500ft

Route Description: Toured up Maggie’s- two laps to the road. Dug a put on the NE aspect (same aspect as sunrise) VERY reactive layer 12” down on facets failed while making column. Failure face was flat smooth and plain- high likelihood of propagation. Wind loaded slopes observed winds lab - lots of whomping-

Avalanches: Observed d2 natural av on a Ne aspect At 5000ft - probably crownwall of 1.5ft

Jan. 17, 2020, 2:30 p.m. PST

Region: West Slopes North - Canadian Border to Skagit River
Observation by Matt Lubar

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

Avalanches: Photo referenced in previous obs,

Jan. 17, 2020, 2:30 p.m. PST

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

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

Area Description: Sparsely treed slope in old burn area east of Driveway Butte summer trail

Route Description: Loosely paralleled Driveway Butte trail on SSW slope to area slightly west of Little Drive, over to NNE facing terrain.

Weather: Cold and mostly clear. Strong sun midday, then overcast later in afternoon.

Snowpack: Snow on solar slopes was warming quickly and a refrozen crust was present on our descent. Some evidence of small storm slabs and point releases on road cut above hwy 20 and visible steep nearby terrain. HS 100cm on southerly slope where measured at ~4800ft. On the northerly terrain, HS 130cm at ~5200ft. The (presumed) December surface hoar/crust layer was found at 54cm at this location on the north-facing slope. It was laying flat on the crust but was otherwise well-preserved and propagated in a stability test (ECTP25). The snowpack here also had 5cm of well-developed 2-3mm basal facets that were somewhat moist.

Jan. 17, 2020, 10 a.m. PST

Region: Mt Hood
Observation by Aldis Raisters

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

Area Description: Newton trees

Route Description: Skinned up dense treed portion of Pea Gravel ridge from Heather runout. Skied NE treed slopes around 5600 ft.

Weather: Intermittent snow, sun breaks and westerly wind. Winds increased PM.

Snowpack: Right side up in the trees with low density snow on top of denser consolidating snow from earlier in the week. Lots of settlement cones around the trees. Also a lot of tree well traps be careful out there. Able to get wind loaded small features on the ridge top to crack and break loose but nothing on the steeper test slope below these wind features.

Avalanches: None

Jan. 16, 2020, 3 p.m. PST

Region: Snoqualmie Pass
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: Snoqualmie Pass

Route Description: Alpental Valley - Source Lake - Big Trees - Draft Dodger Ridge

Weather: Temps 20-30F. Light W winds and light snow tapered and then shut off by late morning. Broken skies with some sun breaks by early afternoon, with good vis into local drainages

Snowpack: Very deep storm snow. Recent near treeline wind slabs were masked by snow from overnight (HN24 7-10cm) - observed mainly NW on Draft Dodger and relatively easy to feel based on variable ski and pole pen. Average ski pen 40-45cm, boot pen 80-90cm. 1/8 melt-freeze crust down on average 145cm above 4000ft. Profile at top of Draft Dodger near Alpental boundary line, 4850ft, NE, 36 deg, wind loaded feature. HS 405cm. 1/8 melt-freeze crust down 190cm. Deep tap test, hard, resistant planar on this interface. Various mod-hard, resistant planar results in small column tests at storm interfaces in top meter - nothing notable. 1/8 crust 25cm thick this elevation. Below crust is a medley of moist melt forms, crusts, and frozen polycrystals - bottom snowpack not fully observed.

Avalanches: No recent avalanches. Snow from last night and early morning (7-10cm) was point releasing on the new/old interface on steep alpine features.

Jan. 16, 2020, 1 p.m. PST

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

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

Area Description: Southerly aspect in the Cutthroat Creek drainage.

Route Description: Travelled on mostly lower angled southerly slopes east of summer trail.

Weather: Overcast and snowing, S1 or S1+ followed by clearing with remaining upper level clouds and SW flow aloft. No wind below ridgeline and from the lack of any obvious transport, not much there either.

Snowpack: HS 205cm at around 5800ft elevation. New storm snow comprised 45cm. An interface within the new snow was easy to shear. The interface with the old snow surface had some weak snow (appeared to be small-grained near-surface facets). Stability tests were unremarkable. Surface hoar and crust layer was found 150cm deep at 55cm at this location. Hoar crystals were clearly identifiable but mostly lacked striation and appeared weathered or rounded. Shovel test was easy or medium with a clean, Q1 shear, but no other relevant results were to be had from the layer. Suffice it to say that it still lurks below.

Jan. 16, 2020, 12:10 p.m. PST

Region: Snoqualmie Pass
Observation by Andrew Richardson

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

Area Description: Commonwealth Basin

Route Description: Kendall West Trees via PCT

Weather: Morning snow, tapered to broken skies with midday sun breaks.

Snowpack: Profile near tree line at top of Kendall Trees: 4800ft, W, 27 deg. HN24 15cm, Boot pen 65cm, Ski pen 32 cm, HS 288. 1/8 melt-freeze crust down 160 cm, 12 cm thick. CT15 down 27 BRK on density change. DTN TD 180 cm.

Jan. 16, 2020, noon PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Craig Muderlak

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

Area Description: Crystal Backcountry - Buillion Basin

Route Description: Up to 6400 feet - Full Profile pit at 5500 feet on SW slopes. Skied SW slope from 6400 down to 5200 on low 30 degree slopes.

Weather: Overcast, s-1 to s1. Light winds out of the west. Temps Low 20's F. No blowing snow observed BLT.

Snowpack: @5,500 SW. HS 180, HN 9, 180-65 cm Right-side-up snowpack from F hardness +/DF's at 180 down to Pencil rounds at 65cm.65cm down to ground: alternating MF and Round layers. CRM BRK down 40cm (storm intrfc), ECTN (13) down 40cm, DTN down 115cm MFcr. In sheltered areas BTL, no cracking or reactivity obs in storm snow. Appeared to be more soft (4F) windslab development on more exposed west facing slopes above 5,500.. No PWL's. Overall, stability seemed good in sheltered areas without windslab development.

Jan. 16, 2020, noon PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Craig Muderlak

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

Area Description: Crystal Backcountry - Buillion Basin

Route Description: Up to 6400 feet - Full Profile pit at 5500 feet on SW slopes. Skied SW slope from 6400 down to 5200 on low 30 degree slopes.

Weather: Overcast, s-1 to s1. Light winds out of the west. Temps Low 20's F. No blowing snow observed BLT.

Snowpack: @5,500 SW. HS 180, HN 9, 180-65 cm Right-side-up snowpack from F hardness +/DF's at 180 down to Pencil rounds at 65cm.65cm down to ground: alternating MF and Round layers. CRM BRK down 40cm (storm intrfc), ECTN (13) down 40cm, DTN down 115cm MFcr. In sheltered areas BTL, no cracking or reactivity obs in storm snow. Appeared to be more soft (4F) windslab development on more exposed west facing slopes above 5,500.. No PWL's. Overall, stability seemed good in sheltered areas without windslab development.

Jan. 15, 2020, 3 p.m. PST

Region: Snoqualmie Pass
Observation by Milholland/Lappetito None

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

Area Description: Kendall

Route Description: Commonwealth to Kendall Peaks Lakes

Weather: Partly cloudy in the morning with cold temps and light snow, becoming overcast with moderate to strong gusty winds by mid-day.

Snowpack: Dry powder surface, 1-2 m of snow from this extended cycle above the crust. Observed rapid wind transport near ridgelines and mostly shallow slabs developing on open slopes near treeline. Most areas we traveled showed very little reactivity, though one west facing slope near the ridgeline exhibited significant cracking within the upper ~30cm evident the development of recent wind slabs. See attached picture of fractured moderate angle small slope that was triggered by the ski tracks of a previous party.

Avalanches: N/A. Tree bombs constituted a significant travel hazard, particularly along or near ridges.

Jan. 15, 2020, 2 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Dan None

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

Area Description: Lake Wenatchee- E/SE aspects between 2000 and 6000'

Weather: Overcast, very cold, east winds developing midday, 20-30 mph and gusty at ridgetops.

Snowpack: Between lake level and about 5500' we found generally rightside up 20-55cm low density HST overlying a melt-freeze crust. Dug at 4600' SE aspect, HS 135, MFcr down 55cm, CTNx2, STM at the crust interface was resistant planar. Grain form above the crust seemed to be rounding facets. Dug again at 5500' SE aspect. Crust had become barely discernible by probe, looked like a 1cm thick layer of rounds in the pit, down 75 cm, HS 230. Surface conditions were changing rapidly above 5000' as the east winds picked up. Soft wind slab was forming and we noticed cracking in our skin track. In sheltered locations the low density storm snow was unaffected. We were unable to trigger any avalanches on our descent but avoided larger avalanche terrain features.

Avalanches: None observed.

Jan. 15, 2020, 12:45 p.m. PST

Region: East Slopes North - Canadian Border to Lake Chelan
Observation by Mark Allen NWAC- Pro Obs East North

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

Area Description: West Fork of Cedar Cr. (Red Rocks Bowl)

Route Description: Willow Creek to ridge crest. Ski -descent into West Fork of Cedar Creek (Red Rock Bowl): Crown Fracture Profile

Weather: This vail of overcast sky at 10,000ft approx. Valley Fog at 500ft. Lightly snowing S-1. New storm snow (HST) 3cm.

Snowpack: Wind affected snow (dunning and slabs) 7000' and up. Pit Location 6500ft NTL. I dug down 150cm. Height of Snow(HS) 190cm Detail: 50cm of new snow deposited on the Jan 9th interface. Right side up resistance (meaning a good progression of gaining cohesion with dept). Soft snow on top and gaining cohesion with depth (Fist+-4Finger+) then jumps in resistance to (1 Finger-Pencil) below the Jan 9th old/new. 20cm ski pen. 70cm boot pen. No Surface Hoar observed in the Pit. NCHeli obs from the Lyall Glacier: The snowpack is nearly 2x the depth as well as double the wind affect. Wind board and variable densities with intermittent distribution of wind vr non wind affected snow. Height of Snow (HS) @7150 is 320cm HS@6400ft is 500cm+ !!.

Avalanches: @6500ft NTL. A Very Small (D0.5) ski triggered (AS) avalanche failing 50cm down on the old/ new snow interface from Jan 9th on a small 38 degree slope. Fracture crown profile suggested no typical weak grains associated with the failure. Meaning no facets on this interface. However, this is 9-days after the deposit. Several (5x) older (72+hrs) D2's on E and NE facing Alpine aspects wrapping the apron of Big Kangaroo Peak with crowns avg. 1m with max 2m depth.

Jan. 15, 2020, 11:45 a.m. PST

Region: West Slopes North - Canadian Border to Skagit River
Observation by Zack McGill

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

Area Description: Baker Backcountry -- Herman Saddle - Iceberg Trees/Osama

Weather: Partly Sunny until 14:15 when clouds rolled in and visibility dropped immensely. Negligible precip, but strong winds at ridge-lines and saddles with massive snow transport, large cornice growth, and turning all our beautiful, cold, pow into wind slabs.

Snowpack: Lee aspects have gained up to a few feet in some places of snow deposited by wind, where windward aspects have been stripped sometimes all the way to the rain crust formed on 1/8.

Avalanches: No naturals observed. Three small skier triggered slab avalanches on W-SW aspects around 5,000'. One by our party -- see photo.

Jan. 14, 2020, 5 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 BC

Route Description: East Peak (W-E aspects), Cement Basin (E-NE aspects)

Weather: Temps 9-17F. Light snow tapering by mid day. Variable light-moderate ridgetop winds increasing to strong from the NW mid-day, with gusty blowing snow on exit.

Snowpack: Cold, soft snow surfaces will be ripe for wind transport and the building of wind slab moving forward. 1m+ of storm snow from 1/4-present settling nicely with no notable weak layers and good snowpack stability observed. NTL: ski pen 40cm, boot pen 80cm. HS 200-275cm (5900-6200ft). New cornices are soft, thick and tricky to gauge.

Avalanches: Recent storm snow found to be mainly unreactive. We could not entice loose dry sluffs to move much beyond a few ski lengths.

Jan. 14, 2020, 4 p.m. PST

Region: Snoqualmie Pass
Observation by None None

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

Area Description: Slack country reverie

Snowpack: 4-6” low density on top of 12-18” heavier snow since Sunday. Storm sluff. No slabs in new snow.

Jan. 14, 2020, 1:30 p.m. PST

Region: Snoqualmie Pass
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: Mt Snoqualmie

Route Description: Phantom Trees.

Weather: Very light snowfall. Cold. Winds light, but knocking snow from trees.

Snowpack: Deep storm snow. Surface light and soft. Subtle changes in the upper snowpack as we moved into slightly higher terrain where more wind effect may have occurred. At higher elevations and in open areas, very soft storm slabs found in upper 30cm of the snowpack. In sheltered terrain and on at lower elevations loose unconsolidated snow surfaces noted.

Avalanches: One natural avalanche at the top of the Phantom Trees. Debris pile suggests storm slab avalanche but we could not see the crown. Debris had 1-2" of new snow on it. Debris ran into the trees and across normal travel routes. Debris 20' wide. SS-N-D1.5/R2-S SW 5600' >40 degrees. We triggered several very soft slabs on test slopes and loose dry avalanches on small rollovers in the terrain. Loose-dry avalanches would entrain snow and run the length of the small features.

Jan. 14, 2020, 11:52 a.m. PST

Region: East Slopes North - Canadian Border to Lake Chelan
Observation by Mark Allen- NWAC Pro Obs East North

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

Area Description: Methow-WA PASS Regional obs over the last 48hrs

Route Description: Obs Cutthroat to Liberty Bowl- Pit location West Face of Vasiliki

Weather: Past wind event from Sunday was evident. Light with Moderate gusts at crest. It was Snowing most of the day less than 1cm/hr (S-1) Sky was Broken east of Delancy and Obscured (X) at the pass. Chilly. Chilly!

Snowpack: Snow depth (HS) is 180-210cm above 5800ft. 30-50cm is new snow since the Jan 9th. very little solar or temperature affect on snow surfaces. The most recent 01/07 crust is noticeable underfoot until 5000ft and drops off to 40-70cm boot penetration above. Wind affected snow above 6400ft as there was significant transport of snow West to East above 6500ft. Some soft cornice development with nothing to large. East of the crest in areas with less snow (like 180cm) the 12/27 Surface Hoar (SH) Persistent Weak layer (PWL) is still reactive at 6600ft Near Tree Line (NTL). I can still observe buried Surface Hoar (SH) at 100cm down and reactive to hard compression (CTH-SP on 3-5mm SH down 105cm). No data from above 6600ft but the Dec 27th Surface Hoar thought to be distributed in the Alpine from previous observations in First Bowl and Cutthroat Pass and as far west as Whistler Bowl (SW bowl of Cutthroat Peak). No data West of the Pass. The most recent storm snow is currently well bonded to the crusts and gaining strength with itself.

Avalanches: None

Jan. 13, 2020, 6 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Joseph Dellaporta

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

Area Description: Dirtyface Mtn/Lake Wenatchee

Weather: The sky was transitioning from overcast to broken as the day progressed with some clearing. Light snowfall ( S-1). Winds were calm with occasional light easterly gust. Temperatures stayed cold ranging from the high teens to low 20's.

Snowpack: This area varied greatly in snow amounts. Lower down near the trailhead at 2,000 ft there was 20 cm of lower density snow on top of a crust. At 5,000 ft there was 50 cm of new snow and a total HS of 235 cm. It seems like the new snow is becoming less reactive at 5000 ft with less cracking and collapsing than two days earlier when I did this same tour.

Avalanches: Noticed a D2 Natural on an east aspect of Dirtyface at 5400 ft (SS-N- R2- D2- S) . Crown depths were approximately 12-20 in deep ( hard to tell from a distance). Likely failed within the recent storm snow. 48 hours earlier I did not notice this crown, it likely occurred in the last 24 hours.

Jan. 13, 2020, 6 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Joseph Dellaporta

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

Area Description: Dirtyface Mtn/Lake Wenatchee

Weather: The sky was transitioning from overcast to broken as the day progressed with some clearing. Light snowfall ( S-1). Winds were calm with occasional light easterly gust. Temperatures stayed cold ranging from the high teens to low 20's.

Snowpack: This area varied greatly in snow amounts. Lower down near the trailhead at 2,000 ft there was 20 cm of lower density snow on top of a crust. At 5,000 ft there was 50 cm of new snow and a total HS of 235 cm. It seems like the new snow is becoming less reactive at 5000 ft with less cracking and collapsing than two days earlier when I did this same tour.

Avalanches: Noticed a D2 Natural on an east aspect of Dirtyface at 5400 ft (SS-N- R2- D2- S) . Crown depths were approximately 12-20 in deep ( hard to tell from a distance). Likely failed within the recent storm snow. 48 hours earlier I did not notice this crown, it likely occurred in the last 24 hours.

Jan. 13, 2020, 3:30 p.m. PST

Region: West Slopes North - Canadian Border to Skagit River
Observation by Zack McGill

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

Area Description: Baker Backcountry -- False Herman.

Route Description: Boulderfield, Boulderfield Trees, and East Gully.

Weather: S- to S1 with some sun breaks throughout the day. Cold temps staying pretty consistent at 17-18 degrees F throughout the day. Light winds.

Snowpack: Another 40cm-50cm plus of snow fell since I was in the same zone yesterday -- filling in a lot of the old crown lines and obscuring all signs of our previous skin track. Cold. Smoke. Blower. Where yesterday we were getting easy hand shears, shooting cracks, and remote triggering steeper connected terrain, today saw none of the obvious signs of instability.

Avalanches: Lots of loose dry in steep over 50 degree terrain -- especially during sun breaks. Triggered a few small pockets of storm slab on small, steep isolated rolls that got to over 45 degrees.

Jan. 12, 2020, 6 p.m. PST

Region: West Slopes North - Canadian Border to Skagit River
Observation by Baker Mountain Guides

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: Toured up to the backcountry gate

Weather: Heavy snow (mostly S5 or less) for the duration of our time out there, 10am - 3pm. It seemed to be snowing more than forecasted... which is just fine by me. The temps decreased as the day went on. Moderate winds from the south.

Snowpack: Observed several cracks while skinning along the convexities of small test slopes. While the small SUPPORTED slopes where difficult to trigger, the instabilities were present. All the hand shears we did in the upper 30-40 cm failed easily.

Avalanches: The steep slope between White Salmon and Heather Meadows avalanched around 9:45am. NW facing at 4,000 feet, D2.

Jan. 12, 2020, 2 p.m. PST

Region: East Slopes South - South of I-90 to Columbia River
Observation by Joe Labernik

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

Area Description: Clover Flats / Darland Mountain

Weather: Wind heavy snow

Snowpack: Elevation 1961 meters SE aspect Pit 105 cm deep Fist to 49 centimeters 4 finger to 45 centimeters 1 finger to 80 centimeters Pencil to 105 centimeters 30 hits on column test no shear.

Avalanches: None seen or heard about

Jan. 12, 2020, 2 p.m. PST

Region: West Slopes North - Canadian Border to Skagit River
Observation by Willy Oppenheim

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

Area Description: Bagley Lakes basin near Mt. Baker ski area

Weather: Stormy throughout the day, consistent snowfall, L/M winds from S/SW

Snowpack: Snowpit @ 4600 ft, S aspect. HS = 320 cm (possibly drifted?) 124 cm new snow above crust ECTP20 down 65 cm at density change within new snow

Avalanches: Observed numerous (~6?) small (D1) soft slab avalanches on convexities throughout the day. We triggered several remotely from adjacent slopes, and also observed some crowns that may have been natural, or may have been triggered by other skiers (no tracks visible). Soft slabs seemed to be failing ~60 cm down on a density change layer within the new snow.

Jan. 12, 2020, 1 p.m. PST

Region: Olympics
Observation by Mike Dawson

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

Area Description: Deer Ridge at 5,400', East of Blue Mountain

Weather: High 20s, snow showers, SW wind 5-20 mph

Snowpack: 154 cm, right side up snowpack. No instabilities noted. Wind transport happening onto N through E faces. Exposed ridges scoured to crust.

Jan. 12, 2020, 1 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Zack Wentz

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

Area Description: Silver King Basin - Crystal Mountain Backcountry

Route Description: Toured up to low angle slopes above Silver King Basin.

Weather: Heavy snow in the AM with light winds at treeline, and occasional moderate-strong gusts. Very heavy snow (approx. 3-4 inches/hr) and moderate-strong winds at treeline in the late afternoon. Temps started warm and dropped in the early afternoon.

Snowpack: Approx. 65cms of F-4F hardness new snow sits atop a density change in the storm snow. New Year's rain crust is down approx. 130cms and is found widespread at TL. Waist deep boot pen at TL. Multiple sudden planar shears were observed in density changes in the recent storm snow down to 40cms.

Avalanches: No new avalanches were observed. Low visibility limited ability to obtain observations above TL.

Jan. 12, 2020, 12:30 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Jason Regan

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

Area Description: Mt. Rainier, just above Longmire. The avalanche occurred across the river from the Carter Falls Trailhead area or just south of that area. We had just popped back onto the wonderland trail from cougar rock campground looking across the Nisqually River

Route Description: Snowshoed from Longmire to Cougar Rock Campground. During the return trip is when the avalanche occurred. Clear avalanche chute, rocky with several cliffs where the avalanche occurred.

Weather: heavy snow and strong winds

Snowpack: wet and heavy, trees were loaded and branches and or whole trees falling due to the wind. Large amounts of snow would also come crashing down when the trees swayed. When off trial our snowshoes sank several feet, 2-3 feet.

Avalanches: only saw 1 and reported it to the park rangers at Longmire. Didn't see what triggered it. Looked up when someone pointed it out and saw movement followed by a large cloud from it falling and hitting the bottom. After the cloud settled, snow was flowing down the chute at a steady rate for a minute or 2.

Jan. 12, 2020, noon PST


Observation by Nate Hough-Snee

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

Area Description: Blewett Pass to 5800'

Route Description: N and NE slopes off Blewett Pass.

Weather: S1-S2 and strong winds, moderate to high transport. Temps cooling. -2 - -4C. Obscured turning to BKN and snow dissipating by mid-afternoon.

Snowpack: Wind transport resulting in depositional and eroded areas. HS ranged from 10cm on water ice to 200cm wind slab/leeward areas. HST 20-34cm.

Avalanches: 1. Intentional, skier-triggered wind slab with 16cm avg crown on north, 38-degree slope at 5800'. HS-AS-R2-D2. 2. Natural storm slab below shedding cliffs with estimated 24cm crown. 40-degree rocks to 35+ degree slope below. West slope at 5700'. SS-N-R1-D2. 3. Unknown debris on Tronsen Head, 5700' N/NE 40-degree slope: SS-NO-R2-D2.

Jan. 12, 2020, noon PST

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

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

Area Description: Blewett Pass to 5800'

Route Description: N and NE slopes off Blewett Pass.

Weather: S1-S2 and strong winds, moderate to high transport. Temps cooling. -2 - -4C. Obscured turning to BKN and snow dissipating by mid-afternoon.

Snowpack: Wind transport resulting in depositional and eroded areas. HS ranged from 10cm on water ice to 200cm wind slab/leeward areas. HST 20-34cm.

Avalanches: 1. Intentional, skier-triggered wind slab with 16cm avg crown on north, 38-degree slope at 5800'. HS-AS-R2-D2. 2. Natural storm slab below shedding cliffs with estimated 24cm crown. 40-degree rocks to 35+ degree slope below. West slope at 5700'. SS-N-R1-D2. 3. Unknown debris on Tronsen Head, 5700' N/NE 40-degree slope: SS-NO-R2-D2.

Jan. 12, 2020, 11:30 a.m. PST

Region: West Slopes North - Canadian Border to Skagit River
Observation by Zack McGill

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

Area Description: Baker Backcountry -- Boulderfield/Boulderfield Trees on False Herman.

Weather: S1-S2 w/ the flat brim showing lots of new precip each lap. Variable winds from the S/SE with some moderately strong gusts. Definitely snow being transported. Visability: ping pong ball.

Snowpack: 30-90cm of new snow depending on where it blew around meant boot top to hip skiing. Easy hand shears at the old snow/new snow interface about 10-20cm up from rain crust and easy ski test results on smaller slopes w/ shooting cracks and all that stuff you'd expect to see on a Considerable avalanche danger day w/ storm slab.

Avalanches: Lots of natural avalanches observed on practically every steep roll over 45 degrees we came across. Crowns lines ran for hundreds of feet sometimes and varied in thickness from a few inches to 3 feet. Triggered one small storm slab (D1.5) while skinning on sub 25 degree terrain that was connected to a small steeper slope (over 50 degrees). Quite touchy out there at noon and the new snow/wind was definitely adding to the spice factor.

Jan. 12, 2020, 11 a.m. PST

Region: West Slopes North - Canadian Border to Skagit River

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

Area Description: E slopes behind Mountaineers Lodge

Route Description: Tree skiing E of the Mountaineers Lodge, down towards Bagley Creek

Weather: Low vis, snowing hard, and windy. It was a storm day.

Snowpack: Lot of new snow and evident signs of reactivity ie multiple large shooting cracks.

Avalanches: E aspect, ~4100'. Natural slide, failed at new/old snow interface. 30 degree convexity start zone. Crown ~3ft @ deepest and propagated ~100ft. D2 ran for ~200ft. Skier buried to stomach and carried a few feet.

Jan. 12, 2020, 11 a.m. PST

Region: West Slopes North - Canadian Border to Skagit River

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

Area Description: See post from Mountaineers Lodge Area. Just adding a picture.

Jan. 12, 2020, 11 a.m. PST

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

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

Area Description: Stemilt Basin

Weather: Snowing, heavy at times, sky overcast, temps estimated 25F, wind below ridge line light and variable, ridge winds 35 mph, 230 degrees, significant snow transport on ridges.

Snowpack: Pit east aspect elevation 6541, time 11:14, 25deg slope, HS 130, storm snow 60cm, sitting on sun crust sitting on facets 3cm thick, facets at 40, 29, 20, 15. Ct un reactive, storm snow right side up. Shovel shear, failed on storm snow sun crust on facets interface, Q1.

Avalanches: Remotely triggered a D2 slide, with the sun crust surface as the failure interface. Dry loose, slope angle estimated 35+, 40cm crown. Ran full slope. Wumphing associated with failure.

Jan. 12, 2020, 11 a.m. PST

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

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

Area Description: Stemilt Basin

Jan. 12, 2020, 11 a.m. PST

Region: Mt Hood
Observation by Lindsey McGuire

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

Area Description: Newton Clark Moraine

Route Description: Skied two runs along the well-anchored low angle slopes on the southeast aspect of the moraine, into Newton canyon. Skied out Clark canyon to HRM parking lot.

Weather: Stormy, windy with large gusts, falling snow all day

Snowpack: Lots of storm snow

Avalanches: Evidence of wind-loading was seen along the ridge, but the snowpack was very stable along that aspect with no signs of instability. During our exit run down the Northwest facing aspect into Clark canyon, numerous small natural avalanches were seen - many cracks were noted in a reactive snowpack but they did not run far since we chose a relatively low angle slope that was anchored with trees. One more open area was skiier triggered but did not run far. It could have been enough to push the skiier into the trees below if it had run further. Estimated D2 in size, see photo. We met the cat track to get out of the canyon but coverage was still relatively low, leaving the river exposed in many areas. We used the path that the snow machines had been on to ensure we were not at risk of falling into the river.

Jan. 12, 2020, 11 a.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: Commonwealth Basin

Route Description: Commonwealth Basin, cross summer bridge, headed NW for a bit up to ~4200 ft

Weather: Sky: OVC, Precip: S1, Wind: M

Snowpack: HS: 165 cm , HST ~80cm

Avalanches: none observed, no shooting cracks or whoompfing

Jan. 12, 2020, 10 a.m. PST

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

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

Area Description: Mt Baker backcountry

Route Description: Attempted to ski towards Slate trees via Bagley Creek but bailed. Ended up skiing thicker trees below Baker

Weather: Heavy snow all day 0800-1500, averaging at least an inch per hour, relatively low density.

Snowpack: Approximately 9-12 inches of new, light storm snow from overnight/early morning on top of denser storm snow from the day before (1/11).

Avalanches: Snowpack proved very sensitive in the upper 9-15 inches, particularly on moderately wind loaded NW to NE facing slopes and on more significant convexities. Several small avalanches were triggered by our party when ski cutting or testing suspect slopes, typically approximately 9-12 inches deep. Shooting cracks were observed and some of the triggered slides propagated up to ~60-80 ft across the slope. We also observed several small natural avalanches. Storm slab broke on a clean surface believed to be a transition from denser older storm snow to the most recent less dense snow. We also observed a big snow cloud and low rumble that we believe was a large natural avalanche running down an avalanche path from either Herman or Slate. We were able to ski some of the denser Baker road lap trees without incident and only minor sloughing.

Jan. 11, 2020, 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? No
Did you trigger any avalanches? No
Was anyone caught in an avalanche? No

Area Description: North facing terrain to 5800' east of Blewett Pass

Route Description: Evening lap.

Weather: Strong winds, heavy wind transport, falling temps. S1-S2 near treeline.

Snowpack: HST +/-10". HS very thin near the road, with rapidly increasing snowpack above 5000'. HS 100cm. Stiff wind slabs and areas of scour with strong west/southwest winds.

Avalanches: None

Jan. 11, 2020, 3 p.m. PST

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

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

Area Description: Glacier Creek

Route Description: Open to moderately treed north facing terrain between 3900' and 5000'

Weather: Varied snowfall with cooling temps through the day. Snow accumulating at 1800' by our departure. Very little wind with brief periods of moderate southerly winds and increased snowfall at ridgetop occurring after 12:00

Snowpack: HS in Glacier Cr. ~200cm @ 5000'- at this elevation 30cm of F>4F new snow on 1/10 interface with an additional 10cm of 1F above 01/07 MFcr (boot supportable). 01/10 interface quite visible in pit wall but produced no results in testing and no observed signs of instability. Below 01/07 MFcr the snowpack is uniform and strong with alternating layers of RG, MFcr, and MFpc.

Avalanches: No avalanche activity observed and no results in snowpack and ski testing.

Jan. 11, 2020, 3 p.m. PST

Region: Snoqualmie Pass
Observation by Matthew Schonwald

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

Area Description: Lower Phantom

Weather: Storming all day, it felt close to an inch an hour for most of the day. Upper mountain was not visible due to the heavy snow.

Snowpack: We did a number of Compression tests and the the top 6-8" was reactive but we never entered big open terrain which could actually propagate.

Avalanches: Heard several and saw Alpental Falls Right fall but did not trigger anything deep.

Jan. 11, 2020, 2 p.m. PST

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

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

Area Description: Delancey Ridge, S-SE aspect below 5500'

Route Description: 'Standard' skintrack to an open area below steeper terrain

Weather: Overcast and blustery; increasing snow in the late afternoon

Snowpack: HS 130cm. Noted two layers of concern: one at a crust below the ~30-40cm new storm snow and one atop a crust at ~45cm. The upper failed in compression (CT12, Q2) and propagated in a saw test (50/end). Contrast was poor for looking at tiny things, but weak layer appeared to be 0.5mm faceted grains near crust. Lower layer at ~45cm was surface hoar laying flat on a crust that appeared to have been sun affected (mostly melted feather remnants with no visible striations). Snowpack below drier new snow and upper crust was moist all the way to ground.

Avalanches: None observed. The observation from a group skiing higher in the same terrain on the same day suggests the snowpack on Delancey is more reactive above 6k feet.

Jan. 11, 2020, 12:44 p.m. PST

Region: East Slopes North - Canadian Border to Lake Chelan

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

Area Description: Delancey Ridge - South Aspect

Route Description: Traveled standard route up Delancey and dug a pit at 6385’, approx 300’ below the ridge line

Weather: Sun breaks in the AM with significant cooling and increased wind and cloud cover from the west in the afternoon

Snowpack: 6385’ 160cm depth Persistent week layer located at 1 meter depth. Performed isolated column test with results at CT12 at storm slab interface (approx 30cm depth). Cleared 30 cm above persistent weak layer (located at 1 meter depth) of concern and performed isolated column test that had planar results at CT 8

Avalanches: Skied 30 degree terrain from 6300’ and skiers triggered multiple avalanches on the storm slab interface. This includes remote triggers as well. Storm slab was not reactive below approx 6000’.

Jan. 11, 2020, 12:40 p.m. PST

Region: Mt Hood
Observation by Scott Norton

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

Avalanches: Very small skier-triggered avalanche out of bounds near Timberline. Crown ~25cm. SE aspect

Jan. 11, 2020, 11:33 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: Knoll by the first of the Grace lakes

Route Description: Approached the lake from the Stevens Pass Parking lot

Weather: Full cloud cover, moderate wind speed, S5, 31F temp

Snowpack: Lots of new snow (currently decomposing) on top of the MFcr from 1/7. See here for my snow pit profile: https://snowpilot.org/node/20280

Avalanches: R1 D1 slide immediately off the Stevens Pass parking lot by the Grace Lakes trail head (attaching photo)

Jan. 11, 2020, 11 a.m. PST

Region: Mt Hood
Observation by Ted Cramer

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

Area Description: Jills Trees in Newton Creek just East of Heather Canyon on Mt Hood. Elevation 6200 ft

Route Description: We hiked up the normal route along the ridge of Newton from the Hood River Meadows lot

Weather: Snowing hard and very windy

Snowpack: We dug a pit up in the more open portion of the Ridge and identified a weak layer about 45 cm deep CT 12 or so. There were shooting cracks from our skis to this layer and we decided to stick to the trees down the ridge.

Avalanches: An avalanche triggered in the trees. It was in a valley with a bit of opening in the trees. Snow falling from the trees was the trigger. It was about 40 cm deep, 10 m wide and ran about 50 m downslope.

Jan. 11, 2020, 8:30 a.m. PST

Region: Mt Hood
Observation by Heiko Mt Hood Backcountry Ski and Avalanche Inst.

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

Area Description: MItchell Crk Trees

Route Description: South or SW side of the creek.

Avalanches: Our Level 1 students observed 2 natural avalanches. Most likely occurred within 2 hours or less prior. Based on the amount of new snow at the crown and bed surface from the ongoing storm. In the background of the picture. Note another crown from a larger slide that originated somewhere up slope from the one in the foreground. Which ran into the creek bed. This is a common route for recreational users that track up the south side of the creek.

Jan. 10, 2020, 6 p.m. PST

Region: West Slopes North - Canadian Border to Skagit River
Observation by Dane None

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

Area Description: Mt. Baker - South

Weather: Winds moderate, S2, 28F.

Snowpack: 5000' NE, slope 35*, 20cm new snow on top of surface hoar (V 3mm in size). Wide spread and very reactive. CT2 Q1 @ 20cm deep and CT8 Q2 @ 45cm deep over rain/wet snow crust @ 45-68cm from Wednesday. Low density (F) under the crust until 85cm deep transitions to uniform 1F and well bonded to old crust.

Avalanches: New snow layer was moving fast and easy over surface hoar. Many shooting cracks and remote triggered small slides while skinning, one propagated about 75' across. Some were soft slabs but others were more dense wind slabs that ranged up to a foot deep.

Jan. 10, 2020, 6 p.m. PST

Region: Stevens Pass
Observation by Joseph Dellaporta

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

Area Description: Lichtenburg Mtn.

Weather: Skies were overcast and obscured. Moderate snowfall rates throughout the day. Winds were mainly calm, with an occasional easterly gust. Temperatures remained cold in the low 20's.

Snowpack: Starting the day off there was approximately 12-15 cm of low density new snow on top of a supportable crust. This quickly changed once we reached 4500 ft where we found 30 cm of new snow on top of a thin and not so so supportable crust. Once we gained the near tree line elevations the new snow became more touchy with noticeable cracking and running on small test slopes.

Avalanches: We noticed an avalanche at 5100 ft on a West aspect of Lichtenburg on a steep convex rollover. Crown depths appeared to be 6-12 in deep. Likely failed on the new/old snow interface. ( SS- N- R1- D1.5- I)

Jan. 10, 2020, noon PST

Region: Stevens Pass
Observation by KEITH YOUNG

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

Area Description: yodelin area

Route Description: trees and small open slopes.

Weather: heavy snow, poor vis

Snowpack: toured there last 3 days . Changes today was certainly obvious

Avalanches: small test slopes slid on crust layer, first signs of this in 3 days of touring, 3-8 inches deep. no whumpfs or shooting cracks. surely a cohesive slab is forming,

Jan. 10, 2020, 8 a.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 5900’

Route Description: Buillion Basin

Weather: Dumping (s-1, to s1) L - M winds blowing snow and filling in the skin track in open areas.

Snowpack: Approximately 5-10cms of new, evidence of wind effect on open slopes down low. HS at 5900’ was 185 Skin track tests yielded no remarkable results. Pit at 5900’ W yielded F/F+ dense through top 30-40 cm. Easy to moderate CT results in the 30-40cm range x2. Skiing seems real nice in sheltered areas. Please excuse the snerding, prepping for an avi class ;)

Avalanches: No evidence of naturals this AM.

Jan. 9, 2020, 3:49 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River

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

Area Description: Paradise - Alta Vista East

Route Description: Paradise to Alta Vista East via Mertle Falls Trail.

Weather: Overcast, Light Winds, Moderate Snow, ~22F

Snowpack: 5700', E aspect, slope 25, @15:50 - Test pit to 120cm and obtained an ECTP-12-RP-@40cm down on ~5cm crust. Cornices/loading was observed on lee aspect of Alta Vista.

Avalanches: None observed

Jan. 9, 2020, 2:17 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River

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

Area Description: Paradise

Route Description: Paradise Valley Trail (winter route), 5200', SE aspect

Weather: Overcast, Light Snow, ~28F

Snowpack: ~20cm of new snow on older crust with weak interface.

Avalanches: Skier released small slab on isolated feature, 10' cross slope, 15' down slope.

Jan. 9, 2020, 11 a.m. PST

Region: West Slopes North - Canadian Border to Skagit River
Observation by Ryan Ostrom

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

Area Description: South side of Mt Baker.

Route Description: West of Peanut Knob on way to Bkwer pass to get to south side of Railroad grade.

Weather: Sun/ clouds 20-30 mph wind coming out of sw

Snowpack: 6 inch fresh on top of crusty layer that was rained on 2 days ago.

Avalanches: Top layer slid (6") 60' wide 100' downhill on NE facing 40° slope after ascending on snowmobile. Seen 2 other slides in similar dinamic.

Jan. 9, 2020, 9:15 a.m. PST

Region: West Slopes North - Canadian Border to Skagit River
Observation by Pete Beglin

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

Area Description: South Sub-summit of Mt Herman

Weather: broken clouds, cool to cold, still

Snowpack: boot-top dry loose powder or rain saturated, refrozen pack from recent storm cycle. No signs of instability; obvious large cornices on east facing aspects of ridges predicting wind loading beneath; no surface wind slab signs (our plan was to avoid east facing potential wind loaded start zones)

Avalanches: bootpacking the last 25 vertical feet to the sub-summit staying 10 feet back from the cornice edge (miscalculated the vulnerable weak point) 2 climbers triggered a large (1-2 school buses sized) cornice block to fall onto the 35-40 degree east facing slope; climbers fell 30-60 vertical feet. One climber was packed into a small moat rim around a rock, upright against the shielding rock with minimal trauma, as the avalanche of the wind loaded new snow and the broken cornice block poured past him and carried the second climber, who was able to swim to stay on top, another 200 VF downslope; the entrained snow ran very fast on the rain crust and ran at least 500 VF. No injuries despite the significant height of fall. A cautionary tale as we thought we were giving the cornice the wide berth it commanded. Learned from a friend that the cornice had earlier developed a cleft 10 feet back as it sagged, which didn't fail in the rain event but was completely filled in. We broke the cornice off at this unseen weakness, which broke on the rock ledge of the sub-summit block, as we bounced off it on the sudden ride down.

Jan. 8, 2020, 3 p.m. PST

Region: Stevens Pass
Observation by Keith Young

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

Area Description: Stevens pass yodelin area

Route Description: Skied and tested southeast and north sub 30 degree slopes . low consequence test areas (Slopes greater than 35 deg) did not produce anything resembling cohesive slab. No whumpf whatso ever over 5 hours of touring.

Weather: I judge weather on how much snow falls over a five minute period on our dog see picture

Jan. 8, 2020, 2 p.m. PST

Region: Snoqualmie Pass
Observation by Eddie Schoen

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

Area Description: Hyak ridgeline

Weather: Snowing, S1, with short periods up to s2. Increasing winds

Snowpack: 3,800’, WSW aspect, HS80cm, New Year’s crust down ~30cm has softened up with recent rains and warm temps. 1F and not as distinguishable. Saturated rounded grains all the way to the ground beneath today’s HST (3ish cm).

Jan. 8, 2020, 2 p.m. PST

Region: Snoqualmie Pass
Observation by bobby pogue

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

Area Description: source lake

Route Description: bryant shoulder to bryant col

Weather: snowing (consistent graupel transitioning to lower density snow by 1600)

Snowpack: 20cm graupel on heavily saturated base (hand and pole pits)

Avalanches: loose graupel running on all slopes above 1200m

Jan. 8, 2020, 1 p.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Bradley Gasawski Tonya Morrey

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

Area Description: Northwest shoulder of Diamond Head Peak near Blewett Pass.

Route Description: Skinned up NFS Road 9716 to just above 4400'. Turned east and gained an open glade spanning between 4700' and 5000' on the NW shoulder of Diamond Head.

Weather: Broken clouds with very light snowfall between 12:00 and 14:00. Moderate snow began to fall as we drove down around 15:00. Temps in the upper 20's F. At 4800', the winds were light to moderate with no blowing snow.

Snowpack: Snowpack is around 20 cm at 4200' and up to 45 cm around 4800'. We dug a small test pit and found the snow to hold enough moisture to make snowballs. We found the crust from the rain event earlier in the year. We did a shovel shear test with the snow above the ice crust layer and the snow above it (18 cm thick) sheared in a planar break at the new snow & ice crust interface. With the recent snow, then rain and freeze period last night, there is a cohesive layer developing above the ice crust. We'll see how well these layers bond. The top of the snow is developing surface hoar across the snowpack where we traveled. The snow surface is breakable crust.

Jan. 7, 2020, 5 p.m. PST

Region: Mt Hood
Observation by Geoff Lodge-Oregon Ski Guides

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

Route Description: Toured around Timberline Lodge the last few days with a Level 1 group. The poor visibility kept us from getting above treeline. Lots of wind scour on westerly aspects and there was still quite a bit of ice showing from the big rain event a week ago. The lee terrain had deeper snow from the last few storms. Still on the shallow side for this time of year as we found an average height of snow around ~130cm.

Weather: Warm, heavy, snow fell on Sunday. A warm up on Monday afternoon lead to light rain. The top 15cm of snow got lightly saturated and the surface developed a 2-3cm rain crust by Tuesday morning.

Snowpack: Surface is a fairly supportable rain crust that was slippery for skinning/shredding on. Light snow was falling and seemed to be bonding to this warm ice surface. Below the surface, we found two storm interfaces at ~15cm and ~45cm from the last few days of snow events. Compression tests on these interfaces showed resistant planar fractures in moderate taps. After two days of observing these two interfaces, we did start to see them gaining strength by the end of today. Below this is some really firm, icy, snow about ~70-100cm down. This was very firm and was tough to get snow saws and shovels through.

Avalanches: We did not see any avalanches. We looked into avalanche terrain, but did not enter it with the elevated hazard. Be safe out there! Bring on all the new snow this next week! Geoff Lodge-IFMGA Mountain Guide-Oregon Ski Guides

Jan. 7, 2020, 3:33 p.m. PST

Region: East Slopes North - Canadian Border to Lake Chelan
Observation by Peter Larsen

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

Area Description: Early Winters to 166.2 avy. red zone. No traffic past cuthroat rd.

Route Description: N. aspect Silver Star creek. up 1000 vert. old growth.

Weather: lt. snow to rain in p.m. lt. wind. 31deg. plus. last trapped cold air between E.W and Lone fir. Above wet,thick rain crust,no snow on trees and rain. Lt. to no wind.

Snowpack: 4"new over light rain crust over HEAVY Mashed potatoes. Warming throughout day with treebombing and accelerated settling. Smooth in open.

Avalanches: None seen or heard.

Jan. 7, 2020, 2:05 p.m. PST

Region: Mt Hood
Observation by Kevin Jones

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

Area Description: Hiked to about 9 thousand, directly south of crater rock.

Route Description: Hiked up the Palmer lift line and continued north. I then hiked north east until I found an area on more of the leeward aspect.

Weather: Seemed like super cooled water droplets from the warm ocean air which freeze onto windward aspects.

Snowpack: 2+ inches of ice/interesting ice crystals on top of a foot or so of softer snow, a layer of ice, and then several feet of softer snow.

Avalanches: NA. I was stepping around on a sheet of ice. You could've probably summited Tuesday.

Jan. 7, 2020, 11 a.m. PST

Region: East Slopes Central - Lake Chelan to South of I-90
Observation by Bradley Gasawski

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

Area Description: Blewett Pass, Pipe Creek & Tronsen Meadow area.

Route Description: I skied below 4500' on this tour in the Blewett Pass area. I skied near the base of Diamond Head Peak near Blewett Pass. I was not able to get close enough to get a decent photo of the recent avalanche activity.

Weather: Started off as light rain with cloudy skies. Turned into partly sunny by 12pm with no precip.

Snowpack: The snowpack received what looks like about 5" of new snow since Sunday late afternoon. However, the new snow was rained on all night. The snow level looked to be around 5000' in the Blewett Pass area. The snow was soft and wet under the skis. Forest Service Road 9716 has several locations of standing water that had frozen. Areas that had very little snow around the 3600' to 4400' elevation as of Sunday, now have no snow with bare ground showing. I can only assume the warm temps and rain melted away any snow here. Existing areas of snow from Sunday's observations have more snow, but it is packed with moisture and variable in depth from 15 - 25 cm. South facing slopes have very little snow at this time. The nordic ski trails in this area should have enough coverage to ski. The area has so much blow down that off trail skiing would be met with many obstacles not yet covered by snow.

Avalanches: I saw numerous point release avalanches below the cliffs on the north side of Diamond Head. I was too far way to get an accurate count, but the debris fields was obvious from NFS Road 9716. Given it's location, I would say they were 5500 feet and higher.

Jan. 6, 2020, 5 p.m. PST

Region: Mt Hood
Observation by Nam P

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

Area Description: Ski Bowl / Tom Dick Harry 3500-5000 feet Mostly Northish aspects

Route Description: Ski Bowl / Tom Dick Harry Skied Northish facing 30-40 degree of super heavy concrete!

Weather: Warm air temp but no precipitation. Top layer snow temps were super warm and wet!

Snowpack: Didn't dig any full pits but did lots of hasty pits. Observed heavy wet snow on top of a harder crust. In some spots there was another buried hard crust. Did lots of ghetto Rutschblock tests on N & S facing 30-40 degree slopes and didn't see any signs of propagation and was hard to get the ice crust layer to fail.

Avalanches: None observed

Jan. 6, 2020, 1 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River

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

Area Description: Paradise Valley Rd

Weather: heavy snowfall, 1"-2"/hour

Snowpack: 180cm. Denser storm snow sits on top of lower density snow from the weekend. ECTP 13 at 60cm depth and shovel sheared easily on ice crust at 100cm depth. S aspect at 5200'with 30 degree slope, sample popped off into pit.

Avalanches: Soft slab that naturally broke within storm snow interface about 60cm depth. Slide ran full path (60' by 150') R4 D2 2 skier triggered avalanches by use of ski cut on 30+ degree slopes resulted in a soft slab release about 60cm depth. Ran full path but only a R3 D2. Steps down to icy crust from New Years.

Jan. 6, 2020, noon PST

Region: Stevens Pass
Observation by Matt Primomo

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

Area Description: Stevens Pass

Weather: Spent Sunday and Monday morning out in the area. Sunday the 5th light snow in the morning turned to moderate snow by mid day and heavy snow (3”/hr) by shortly afternoon. All was low density, cold snow. On our way out at 5pm it was positively nuking. Winds picked up during the afternoon and moderate drifting observed in the NTL and from afar in the ATL. After we left the winds really cranked as a strong, narrow convergence band set and was aimed directly at Stevens Pass into the evening hours. Monday, arrived at 9:30 to moderate snow rates and slightly moist. Snowfall rates became heavy again with slow warming trend. By noon we were soaked and snow was wet at pass level. Winds picked up again. Time to leave before the pass shuts down. Dodged falling trees in the Hwy on our way down. Falling tree danger High, bordering on Extreme.

Snowpack: On Sunday at 5,400ft N aspect above Lake Valhalla: HS 200cm. Boot pen 90cm with 90cm over stout NYE crust, and 55cm over 1/3 crust. The 1/3 was a laminated crust and fairly thin (1-3cm), but knife hard with 1f- soft, dry snow above and below it. Could also just barely discern a delicate eggshell drizzle crust from the same morning down 10cm (1/5 ). F- low density snow made up the upper pack. Observed weakness with an inter-storm layer down 20cm. PST 35/100 (SFC) down 90cm, just above NYE crust, though it propagated to End after continuing and reaching ~50cm up the column.

Avalanches: Active dry loose on Sunday afternoon to D1.5. Storm slabs beginning to materialize by late afternoon along with wave like fractures beyond ski tips while making deep powder turns. Monday morning: Multiple natural and very easy to initiate slabs within storm layer above 1/3 crust on steep features of all sizes and starting at ~3.5k elevation. Observed up to 5k. From afar observed some D2.5s in the Berne Camp Chutes, though uncertain how deep or which layers. These filled in the gullies, and ran to the lower tracks.

Jan. 5, 2020, 3 p.m. PST

Region: Snoqualmie Pass
Observation by Eddie Schoen

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

Area Description: Alpental Valley up to Snow Lake Divide

Weather: Calm winds, OVC

Snowpack: Couple quick notes from yesterday that could be relevant with this incoming storm cycle. The post NY rain crust was widespread, as expected, and down 30-40cm. Interestingly, at lower elevations (3,200, E asp), the crust was sitting on top of some preserved rimed precip particles and popped very easily with a few quick hand pits (ie, fractured on isolation when sawing with pole handle). At mid elevations (4,000-4,500), the crust was observed lying on top of stronger water saturated grains. Not to imply it's unreactive up high, rather, expect that crust to be more reactive below tree line. Also noted a layer of graupel within yesterday's HST buried about 10cm down. This was noted at 4,500 at the Snow Lake Divide. HS 200cm at the divide.

Avalanches: N/O

Jan. 5, 2020, 11:30 a.m. PST

Region: West Slopes South - South of I-90 to Columbia River

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

Area Description: Paradise, Mazama Ridge

Route Description: Paradise , Stevens Canyon road, Mazama Ridge

Weather: Moderate wind from west, cloudy, snowing 2CM per hour, 26-30F.

Snowpack: Shovel tilt test- 2nd easy, separated at 8 cm. Hard crust located at 45 cm

Avalanches: N/A

Jan. 5, 2020, 10 a.m. PST

Region: Stevens Pass
Observation by Dellaporta, Hough-Snee, T-Wire

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

Area Description: Lichtenberg via the rib and saddle between the north and southwest summits.

Route Description: Lichtenberg via the rib and saddle between the north and southwest summits.

Weather: Overcast to obscured with some breaks, S1 with winds blowing light east early, to harder west/SW late and snow picking up to S2 by early afternoon. Temps 0 (3500') to -3 C (5500') and stable through 1200. Warmer at the road at 1300.

Snowpack: Large cornices from strong, prevailing westerly winds (4 Jan) and cross-loading mid-slope on west and southwest aspects from topographic winds. Friday 3 Jan thaw and Saturday 4 Jan refreeze created locked up base with low-density storm snow. HST 20-36cm depending on wind and tree cover.

Avalanches: Recent debris low in a westerly gully/drainage feature at 4000'. Appeared to be wet debris that broke and ran mid-slope during the warm-up. May have originated higher, but couldn't see start zone in snow. D2.

Jan. 4, 2020, 3 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River

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

Area Description: Paradise, close proximity (i.e. within half mile) from lodge.

Route Description: Paradise to Alta Vista via Edith Creek Trail.

Weather: Snowing moderately, windy to gusty, cool temps, and cloudy.

Snowpack: 8-10" new snow over crust. Lighter snow under crust. 1F-P snow deeper than 40cm Storm slab reactive on ski test and column isolation at 15 cm. Blowing snow and evidence of wind transport.

Avalanches: No avalanches observed.

Jan. 4, 2020, 2:40 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Madelynn Scherrer

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

Area Description: Open slopes with patches of trees.

Route Description: SW aspect of Platinum peak descending in to Bullion Basin at about 6,000ft.

Weather: Heavy snowfall in the morning, partly cloudy the rest of the day with occasional snowfall.

Snowpack: Rain crust under powder anywhere between 2" to 12".

Avalanches: D1 loose dry avalanche triggered; skier in video traversed hard to looker's right when video begins.

Jan. 4, 2020, 1:55 p.m. PST

Region: East Slopes North - Canadian Border to Lake Chelan
Observation by Ed Rundle

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

Area Description: Ridgeline between Cutthroat Creek and Pine Creek. Elevation 6200’. Due N facing slope.

Route Description: Ascending ridge

Weather: Light snow falling, no wind

Snowpack: Generally, soft unconsolidated recent snowfall on crust layer(s)

Avalanches: Proximity triggered slab release approximately 2m to right of trail breaking skier. Party of three ascending ridge. Slab 9 to 10m wide, 2/3 to 1m deep. Skier in photo for dimension reference, was NOT at this location at time of slide. Slide ran for 10 to 13m to break over, then was out of sight. Party decided to descend back down ridge to low and moderate angled slopes down to highway.

Jan. 4, 2020, 1 p.m. PST

Region: Mt Hood

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

Route Description: Went up white river to Boy Scout Ridge.

Weather: Overcast /Windy

Avalanches: Found a recent small skier triggered (we think) avalanche just lookers right of the skin track.

Jan. 4, 2020, 9:30 a.m. PST

Region: Mt Hood
Observation by Jesse Engum

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

Area Description: 2-10" fresh

Route Description: Skin track from White River west snow park to first ridge east of Timberline lodge, around 6k feet, then back.

Weather: 30+ mph winds

Snowpack: wind-blown, heavy, light

Avalanches: none observed