YESTERDAY:
Sunrise Friday was at 08:07 Hrs. -4 with a 20-40 KPH East wind. +1 in the valley.2240 meters -9, Winds were 20-30 KPH E--Horstman Hut
1860 meters -6, Winds were 15-30 KPH SE --Rendezvous
1560 meters -5, 8 cm in 12 Hrs, 14 cm in 24 Hrs, Base 88 cm--Catskinner
If only we would have received half the precip Squamish did--45.9 mm yesterday.
As of 07:00 Hrs this am we have overcast skies and unlimited visibility.FORECAST:
A lull this am before another frontal band arrives with light precip this morning in a Westerly flow aloft. The freezing level will hover in the 1000-1400 meter range today with a chance it might spike to 1700 meters tonight. We will see moderate precip and strong winds by this afternoon. Precip easing Sunday morning with a drying trend in the afternoon with cooler temps. Another front for Monday with the FL dropping to surface. An upper ridge builds for Tuesday with mostly sunny skies. Unsettled for Wednesday. Guesstimates: 15-25 cm above 1500 meters by Sunday am, 1-3 cm by Monday am, 12-18 cm by Tuesday am.
AVALANCHE ACTIVITY:
An avalanche has killed a sled skier at Anthracite Ridge, Colorado. Article below. CAIC PicFriday reports of a suspected widespread natural avalanche cycle to size 2 at the peak of the intense wind and precipitation. Early morning explosive control showed explosive and intentionally triggered avalanches to size 1.5 on re-loaded crusts. These windslabs were reported in lee and cross loaded features.
Thursday saw numerous explosive triggered small (size 1's) and large avalanches (size 2's) , some that released on the persistent crust layer while others were within the storm snow. One avalanche in particular illustrated how a small avalanche can step down to a known deeper layer creating a large avalanche.
On Wednesday there were reports of ongoing avalanche activity from explosive control and human triggered avalanches in the small to large range. Reports indicate varied reactivity on a buried crust layer and include an explosive controlled large avalanches (size 2-2.5) on lee sides of ridge top features near treeline. Elsewhere avalanches were small (size 1) with average crown depths of 5-15cm deep.
INFORMATION & OBSERVATIONS:
15:30 Hrs. Snowing -3 with a 30-55 East wind. Snowing!!LOCAL AVALANCHE CANADA MIN REPORTS:
Joffre Shoulder: Dec 18, 2020
Zoa Ridge: Dec 18, 2020
VIDEOS:
Zoa Ridge Test Pit, Coquihalla: Dec 18, 2020
Powder Picker Dec 18, 2020: David Jones
ARTICLES:
An avalanche has killed a skier at Anthracite Ridge: Colorado
North Shore rescue warns of avalanche hazard this weekend: Pique
Western Canada--Storm Warning: Avalanche Canada
Propagation Saw Test--Helmet Sometimes Required: Powder Cloud
Evaluating avalanche terrain while snowshoeing: Crested Moon
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