Avalanche Forecast
Issued: Nov 27th, 2019 8:09AM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Persistent Slabs.
ross campbell,
Parks Canada
Hazards today: Cold temperatures, short days, buried early season hazards, and a Surface Hoar Layer buried 30-50cm down from the surface.
Summary
Weather Forecast
Strong North Easterly winds are escorting an Arctic front, as it tracks south towards the US border. We may see some cloud develop throughout the day, but no actual precipitation is forecasted, with freezing levels staying well below valley bottom. It will be cold and clear tonight, tomorrow and probably for the rest of the week.
Snowpack Summary
Strong Northerly winds will try to redistribute last weekend's storm snow in the Alpine and at Tree-Line; likely with little success. Cold temperatures are also aiming to suck slab properties out of the upper snowpack. The 2 main layers to watch for are the Nov 23rd Surface Hoar, buried 30-50-cm, and the Nov 17th interface.
Avalanche Summary
No new avalanche activity was observed in the Highway Corridor yesterday or from the Back Country. Sunday's storm produced a decent natural avalanche cycle to size 3 in Rogers Pass. Avalanche activity has tapered off since the storm; with only one report of a skier triggered avalanche on Glacier Crest on Monday.
Confidence
Problems
Persistent Slabs
40cm of snow fell over the weekend burying a weak surface hoar (SH) layer. Cold temperatures should decrease the slab properties above the SH layer; however, this layer is still not to be trusted, and groups should manage their exposure accordingly.
- Minimize exposure to terrain traps where the consequences of an avalanche could be serious.
- If triggered the storm slabs may step down to deeper layers resulting in large avalanches.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Nov 28th, 2019 8:00AM
