Avalanche Forecast
Issued: Nov 29th, 2020 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs and Deep Persistent Slabs.
JSmith,
Avalanche Canada
50-80 cm. of recent storm snow and moderate to strong southwest winds have formed widespread storm slabs ripe for human triggers. Additional snow and shifting northwest winds on Monday may form fresh wind slabs on lee features at treeline and above.
Summary
Confidence
Weather Forecast
SUNDAY NIGHT: Cloudy with flurries; 0-3 cm. / Moderate to strong, southwest wind / alpine low temperature -10 / Freezing level valley bottom.
MONDAY: Snow, 5-15 cm / Moderate, northwest wind / alpine high temperature -6 / Freezing level 1000 m.
TUESDAY: Sunny / Light, northwest wind / alpine high temperature -8 / Freezing level valley bottom.
WEDNESDAY: Sunny / Light, south wind / alpine high temperature +2 / Strong inversion with an above freezing layer of air above 2000 m.
Avalanche Summary
A naturally triggered size 2.5 avalanche was reported on a southeast aspect in the alpine on Saturday.
Data is very sparse in this region. Please submit your observations to the Mountain Information Network.
Snowpack Summary
50-80 cm. of recent storm snow and moderate to strong southwest winds have formed widespread storm slabs ripe for human triggers. There is a crust from early November now down approximately 75-125 cm. This crust has been observed with sugary facets above and below it. There are limited observations on this layer, but some test results indicate that it has the potential to be reactive to human triggering. Total snowpack depths are an average of 100-200 cm at upper elevations, tapering quickly at lower elevations.
Terrain and Travel
- Storm slabs in motion may step down to deeper layers resulting in large avalanches.
- Avoid exposure to overhead avalanche terrain, avalanches may run surprisingly far.
- Continue to make conservative terrain choices while the storm snow settles and stabilizes.
- Avoid terrain traps where the consequence of any avalanche could be serious.
- Avoid steep convex slopes.
Problems
Storm Slabs
50-80 cm. or recent storm snow and moderate to strong southwest winds have formed widespread storm slabs ripe for human triggers.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Deep Persistent Slabs
A crust from early November exists down about 75-125 cm, and may have weak sugary facets above and below it. Storm slab avalanches may step down and trigger this layer, resulting in large avalanches.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Nov 30th, 2020 4:00PM
