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Observations

Dec. 10, 2017, 4:30 p.m. PST

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

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

Area Description: We traveled from Paradise to Mazama Ridge and into the Mazama back bowls, returning the way we had approached.

Weather: Clear, warm, and sunny with a light breeze form the NE.

Snowpack: The surface snow was extremely variable including hard windpacked, sun crust, sun warmed mashed potatoes, and light soft dry sugar snow. We saw intentionally skier triggered pin wheels (2' diameter) on a steep south facing slope at the end of the day (230pm).

Avalanches: No new avalanches observed.

Dec. 10, 2017, 3 p.m. PST

Region: Stevens Pass
Observation by Nick Pope, Northwest Mountain School AIARE Level 1

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

Area Description: Stevens Pass-Skyline Ridge

Route Description: Up road to Skyline lake, then up to ridgetop.

Weather: Cold at the pass, 16 deg F, with light to moderate easterly wind. A cold cloud hung in the valleys to the east and tapered out over the west side. Top of the cloud was ~4200'. Above the cloud was full sun, moderate temps at or just above freezing, and calm wind.

Snowpack: Surfaces were mixed bag. Below 4500' there is plenty of surface hoar, but we saw this going away as we went higher, even looking into the top of north facing slopes at 5300' showed no SH. Solar aspects above 4500' had melt-freeze crusts, with some spots near that elevation showing surface hoar atop a thin crust. Sites in Nason Creek drainage at 3400' had well developed surface hoar with a few cm of facets below. At 5300' on a N aspect HS: 115cm, T-Day crust was down 45cm. Compression tests showed moderate and hard Q2 results down 20cm and 35cm within the old storm snow.

Avalanches: None observed.

Dec. 10, 2017, 2 p.m. PST

Region: Mt Hood
Observation by Forrest Wells

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

Area Description: South side of Mount Hood

Route Description: Timberline Lodge to summit via Old Chute route. Descent via the Old Chute via bootpack for ~200' and then via ski to the Hogsback. Skied over the Hogsback and down Hogsback Bowl. Skied down the south-facing White River Canyon headwall (45.3661, -121.6994) and triggered a loose wet avalanche. Skied out of the canyon to roughly the top of Palmer Chair and then down Palmer snowfield to Timberline Lodge.

Weather: Sunny, warm (temps varied by elevation), low wind.

Snowpack: Variable by elevation. No formal snow pit evaluation. Surface snow very consolidated and wind affected.

Avalanches: Triggered a loose wet avalanche while skiing down the ~45 degree face at the top of White River canyon (45.3661, -121.6994). The avalanche path was about 10' wide and ran to the base of the face. A significant amount of snow was transported and there might have been potential for a shallow burial. I was able to ski left to mellower terrain to avoid the avalanche as it descended.

Dec. 9, 2017, 2 p.m. PST

Region: Snoqualmie Pass
Observation by Matthew Schonwald

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

Area Description: 200' above the Beacon Basin

Route Description: Followed glades up to the edge of the waterfall

Weather: Overcast , Calm and low 20's

Snowpack: Hs 105 cm with 3 MM Near Surface Facets(See photo) on the 5 cm melt freeze crust sitting on a 15 cm Fist layer of faceting grains. Below well settled snow to the Thx for nothing crust

Avalanches: None

Dec. 9, 2017, 11 a.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Jerimiah Wedding

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

Area Description: Mazama ridge and golden gate

Route Description: From paradise crossed Edith Creek Basin went near golden gate and decided to traverse to fourth crossing instead due to wind slab. Went up mazama ridge to van trump memorial then back via fourth crossing and the paradise road.

Weather: Clear and warm

Snowpack: West shaded slopes had windslab in wind loaded areas and snow 150 cm deep with a crust 60cm deep. On mazama ridge overlooking Stevens canyon snow depth was 30cm and well consolidated. Solar affected slopes were topped with thin slush by late morning and we caused and witnessed several large pinwheels form (2-3 foot diameter).

Avalanches: None seen.

Dec. 8, 2017, 11:49 a.m. PST

Region: Stevens Pass
Observation by Tom Whipple/ Pat Riffie

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

Area Description: Gorgeous, hot skiing above the inversion, cool and fun in the shade.

Route Description: Rainy pass to Jove Peak, 2 laps on NE face (still great ski quality), then exit off the S face.

Weather: Calm wind, scattered clouds. Inversion and valley fog, above 45 degrees F midday in the sun.

Snowpack: Full profile (without temps) at 5770', 40 deg slope, NE aspect: Depth (cm): Grain Form/Size: Resistance: 120-110 DF/1mm F 109-85 DF/1mm 4F+ 84-60 DF/1mm 1F 59 Crust K 51-58 MFcl/2mm 1F 50 (Thanksgiving) Crust K 0-49 MFcl/2-3mm P CT13/14 up 110 RP CT16 up 85 RP CT21 up 60 SC, resistant after collapse

Avalanches: None observed. Some pinwheel rollers on solar aspects.

Dec. 6, 2017, 2 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: Salmon la Sac

Route Description: Hawkins/ Gallagher Area. Travel was on all aspects up to 6700ft.

Weather: Sunny with some scattered low clouds hanging over ridgetops here and there. Moderate Easterly winds on ridgetops.

Snowpack: Let the facet factory begin. A fairly widespread crop of surface hoar and near surface facets are underway, more pronounced in lower elevations but observed on many W-N-E facing slopes. A thickening sun crust on South and a thin sun crust with near surface facets on off aspects. HS is generally less than 100cm in the area. Old wind slabs have become well bonded in all areas as observed with ski testing. Picture is looking down a West facing slope with surface hoar sparkles apparent. Good skiing can still be found in sheltered areas facing W-N-E.

Avalanches: Noticed a couple D1 Wet Loose slides off steep South facing slopes.

Dec. 5, 2017, 7 p.m. PST

Region: Stevens Pass
Observation by Matt Hartman

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

Area Description: Backside of Stevens Pass Resort, Christmas Bowl-Exit Chutes

Route Description: Skinned up to Christmas Bowl from the Ski Area to the high point and descended N to Exit Chutes. Elevation range from 4,200' to 5,600' on our descent.

Weather: Clear skies, temps just above freezing in the sun and right at or below freezing in the shade. Low to calm winds from the East.

Snowpack: Wind effected snow was evident from East winds over the last few days on N and W faces. We did not ski leeward terrain to look for windslabs. Solar aspects warmed and refroze in the afternoon shade, resulting in a breakable crust at the surface. On a E facing slope at 4500' we found generally rightside up snow conditions. HS 80cm. CT tests showed CTM-CTH RP results down 30-35cm on mixed forms, including facets and small, hard to find surface hoar. ETC P 26 just above the ground on wet polycrystals. PST on the Thanksgiving crust showed no results. Ski quality in the shade was good. Solars were getting warm with D1 wetloose evident on Susan Jane and Josephine Peak.

Avalanches: None.

Dec. 5, 2017, noon PST

Region: Snoqualmie Pass
Observation by Tim Miller

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

Area Description: Chair Peak Basin

Route Description: Source Lake to Chair Peak Basin

Weather: Sunny, Clear, Calm. At/Near Freezing.

Snowpack: Sun effected, heavy, wet on usual solar aspects. Wind effected in Basin.

Avalanches: A little after noon, when we were in the Basin, many solar aspects experienced Loose/Wet slides, wiping out the skin track. Much of the movement occurred under steep cliff-bands. Prior to slide activity, roller balls were witnessed at increasing rates throughout mid-morning, along with snow shedding off unsupported slopes. No movement noted in the Basin or other heavily shaded terrain.

Dec. 5, 2017, 11:02 a.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: Near Mt Herman false summit.

Weather: Sunny with quick warming. 30 degrees in the parking lot at 9am. Guessing without a thermometer, 40-45 degrees on the ascent 9:30-11:00. Evidence of lots of sun energy, roller balls and tree bombs.

Dec. 4, 2017, 6 p.m. PST

Region: Stevens Pass
Observation by Matt Hartman

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

Area Description: Backside of Stevens Pass Ski Resort on South-East facing bowls, then descended West down Wenatchee Bowl.

Route Description: See above

Weather: Skies broken to overcast. No Precip. Light West-Southwest winds.

Snowpack: Rightside up from the ground. Evidence of light wind transport from the last 24hrs was evident on East and South facing slopes.

Avalanches: One very small pocket (small D1) in Corona Bowl released in steep terrain.

Dec. 4, 2017, 1 p.m. PST

Region: Stevens Pass
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: Lichtenberg Mountain

Route Description: Southwest gully

Weather: Broken sky, light winds, temperatures remained cold.

Snowpack: Found an HS of 105cm on a low angle SW facing slope at 5,000ft. This compared to an average HS of 155cm on NW at 5100ft just one ridge over at Skyline yesterday. Significantly deeper snowpack directly on the crest. Structure is solid with F hardness snow on the surface and P hardness at the bottom. Over the past two days I have been finding consistent Resistant Planer results 25cm down on a layer of preserved stellers- CTM 14 RP x 2. ECTN 21 down on same layer. Found only small pockets of wind slab in cross loaded features in the more exposed areas right near ridgeline. Was able to get one small feature to fracture 5m long down 25cm. Cold snow over the Thanksgiving crust appears to be bonding well in all areas observed. Short periods of sun poking through the clouds had little effect on the snow surface on Southerly aspects. Skiing remains excellent.

Dec. 3, 2017, 6 p.m. PST

Region: Stevens Pass
Observation by Matt Hartman-----Northwest Mountain School AIARE Level 1

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

Area Description: Grace Lakes. NE-NW facing slopes from 4800' to 4000'.

Route Description: Skinned up to Grace Lakes from Stevens Pass and skied several short runs.

Weather: Increasing cloud cover and snow as the day progressed. Low East wind in the am, switching to West around 2pm.

Snowpack: RIghtside up from the ground up. Pit at 4600' HS was 103cm. F at surface to P at ground. Pit tests showed no propagation. Hand pits showed well bonded snow to the Thanksgiving crust. Ski quality was good despite thin cover on 30-35 degree slopes.

Avalanches: None.

Dec. 3, 2017, 12:10 p.m. PST

Region: Snoqualmie Pass
Observation by Sarah Foster

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

Area Description: Alpental, 3/4 of the way up the Edelweiss chair, NNE facing slope, 23 degree slope

Route Description: Followed the popular user skin track up from the Alpental base to the top of the Armstrong express, then continued up to the Top of the Edelweiss chair. Skied down the top of "International" ski run, then made our way north to "Snakedance" area

Weather: 28 degrees, overcast

Snowpack: 190 cm snowpack. recent layer approx 50 cm down from the top. pre-Thanksgiving layer approx 130 cm down from the top and 15 cm thick. No activity from compression test, shovel shear test created a break at the 50-cm-down-layer: clean break, but didn't slide. Snow grains at the bottom of the snowpack and rounding and bonding.

Avalanches: None

Dec. 3, 2017, noon PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Alex Ford

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

Area Description: Crystal backcountry, Bullion and Cement Basins.

Weather: Greybird day, light/medium ridgetop winds with ongoing snow flurries.

Snowpack: Significant but highly aspects dependent wood slabs we're widespread today. We noticed shooting cracks and slabbiness on East to Northeast aspects. Steep areas directly off ridge lines on these aspects easily triggered by small ski cuts and cornice drops. Ski penetration of 10 to 15 cm in non wind affected areas, Windward Ridge lines scoured down to crust, Leeward sides with noticeable wind depositions.

Avalanches: As above, D 1 to D 2 slides running quickly in some loaded areas. All flights triggered via EZ ski cuts or cornice drops.

Dec. 3, 2017, noon PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by Alex Ford

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

Area Description: Photo for previous obs.

Dec. 3, 2017, 11:30 a.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: South face of Table Mountain

Avalanches: We observed debris from a quite large slab avalanche on the south face of Table Mountain. The crown appeared approximately 2-3+ feet deep, and propagated a significant distance. The slide ran several hundred feet (we could not see the end of the debris), which was well below tree line, and cleared snow off many trees. I don't know when it ran, but there didn't seem to be much new snow over the debris.

Dec. 2, 2017, 5:20 p.m. PST

Region: West Slopes South - South of I-90 to Columbia River
Observation by IMG Level 1

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

Area Description: We traveled in and around Alta Vista from the Paradise parking lot.

Weather: Overcast with low visibility, light snow, and light west winds all day. Snow fall began to increase in the afternoon. Day time snow 2-3".

Snowpack: Two feet of recent snow over the Thanksgiving rain crust. We found the recent snow to be "right side up". Observations show that the snow is gaining strength.

Avalanches: None observed

Dec. 1, 2017, 11:30 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? No

Area Description: Mt Baker Sidecountry, Swift Creek/Huntoon Point (E facing gullies into Swift Creek, NE of Huntoon Point, S of main Swift Creek runs)

Route Description: E facing gully; triggered 6 inch deep wind slab on 40 degree convex roll.

Weather: Snowing moderately, moderate winds

Snowpack: Shallow wind slab on lee/cross-loaded convex steep slope; storm snow otherwise only forming slab below treeline on wind affected convex/exposed ridge face features. Remainder of terrain not affected.

Avalanches: Skier triggered 6 inch deep wind slab.Moved with moderate speed, only about 30 feet, limited by terrain.