Several small natural dry loose avalanches (sluffs) were observed this week:
A couple small natural wind slabs were observed on 2/17:
4068′ NE aspect, elevation unknown.
Marmot 4000’ SW face
One small human triggered wind slab was triggered this week.
Although the snowpack continues to have poor structure, it has been weeks since we’ve observed a significant avalanche. See obs. When we do not see avalanche hazards and obvious clues of instability it becomes easy to turn off our avalanche brains. Despite the low danger today and unlikely risk for triggering an avalanche, they are still possible in isolated or extreme terrain.
Loose snow avalanches– 6-7″ of new snow this week, combined with last week’s well preserved 6-10″ will produce slow moving, low volume sluffs. They will be possible to trigger in 40º+ steep protected, isolated or extreme terrain.
Saturday, February 20, 2021
New snow totals: 2/18-2/19: 1-2″
Temperatures started the week in the low teens, with clear skies and sunny weather. As the week progressed a storm system began to move into the forecast zone. As the storm began to move closer to Hatcher Pass on Feb 15th, temperatures began to rise into the mid 20s. Early in the morning on Feb 16th snow began to fall and by the end of the day 5-6” of snow had accumulated. On Feb 17th moderate to strong SE winds, gusting 20-30mph for 8 hours transporting new snow and scouring ridge tops. The NWS is calling for light to variable winds today with temps 6-14ºF at 3000ft. Arctic air aloft will keep temps cold today with clouds rolling in Sunday evening bringing potential moisture early next week.
Marmot 4500′ Last 24 Hours:
NWS Rec Forecast here.
NWS point forecast here.
State Parks Snow Report and Motorized Access information here.