Avalanche Forecast
Issued: Nov 27th, 2019 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
lisa paulson,
Parks Canada
The main avalanche concern continues to be the lingering wind slabs. The most inviting slopes to ski may be those harboring this problem. Ice climbers may find it on approach or between pitches.
Summary
Weather Forecast
A predominant North East flow has moved into the forecast region. Mountain top winds forecasted to be moderate to strong from the EAST overnight, & ease through Thursday.
Thursday temperatures are marginally warmer (-20 to -13 range), isolated light flurries along the Eastern part of the region,
Friday - temps warm a bit as we head into the weekend.
Snowpack Summary
Widespread wind effect in the alpine. Some concern remains for possibly triggering old wind slabs from the strong SW winds on specific lee features. The Nov 8 crust is down 20-30 cm and present up to ~2400 m. The lower snowpack is a mix of weak facets & crusts. Snowpack depths at treeline vary from 60-90 cm with up to 140 cm in lee areas.
Avalanche Summary
Although the wind slabs from last weekend have become less reactive, ski cuts and explosive work on Tuesday triggered slabs up to size 1.5, 20-30 cm thick. No new natural avalanches in past few days.
Confidence
Problems
Wind Slabs
Widespread wind effect in the alpine. The main concern for this problem is on lee features near ridge crests and cross loaded gulleys where slabs may be 10-30 cm thick.
- If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
- Use caution in lee areas. Recent wind loading have created wind slabs.
Aspects: North, North East, East, South East, South.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Nov 28th, 2019 4:00PM
