Avalanche Forecast
Issued: Nov 17th, 2020 8:00AM
The alpine rating is Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeChris Gooliaff,
A dramatic warm-up accompanied by strong S'ly winds may trigger a natural avalanche cycle today.
Choose conservative lines with limited exposure to overhead start zones.
Summary
Weather Forecast
WARM and WINDY today, then snowy Wed-Fri.
Today: rapid warming with Alp high of +5*C, FZL rising to 3000m, strong/extreme S'ly winds
Tonight: snow, 15-20cm, FZL dropping to 1500m, mod/strong SW winds
Wed: flurries, 10cm, FZL 1500m, light/mod SW winds
Thurs: flurries, 7cm, FZL 1100m, light/mod SW winds
Fri: flurries, 7cm, FZL 900m, mod SW winds
Snowpack Summary
30-60cm of snow overlies a widespread Nov 5 crust. This crust complex has weaker snow crystals (facets) above, below, and sandwiched in the middle...yes, ugly! Snowpack tests yesterday had sudden planar and/or collapses in these facets. The Nov 5th rain crust reaches as high as 2500m, while a sun crust is found higher on steep solar aspects.
Avalanche Summary
Natural avalanche activity has decreased, with a few isolated storm slabs noted from Tupper and Macdonald. However, a skier accidental with a full burial occurred Saturday up Connaught Creek, where the storm slab was initiated on the Nov 5th crust. If you observe an avalanche or notable conditions, consider sharing on the AvCan MIN site.
Confidence
Problems
Persistent Slabs
Wind and warmth will stiffen up the surface slabs, causing them to become more sensitive to human triggering.
- 1011
- Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Nov 18th, 2020 8:00AM