Avalanche Forecast
Issued: Nov 20th, 2012 4:31PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Deep Persistent Slabs.
brian webster,
Avalanche Canada
Summary
Weather Forecast
The storm is over. Expect mixed sun and cloud with light snow accumulations through the end of the week. Temperatures will cool off slightly with freezing levels near valley bottom. Winds forecast to be light from the west.
Snowpack Summary
30 cm of storm snow at tree-line along the continental divide along with moderate to strong westerly winds has created wind-slabs in the alpine. Wind slabs are reactive to skier triggering on steep lee terrain. Easy shears at storm snow interface and mod shears down 60 cm on Nov 6 crust.
Avalanche Summary
Sunshine Ski Hill reported several class 1 avalanches ski cut within storm snow on steep rolls. During field trip to Bow Summit area no natural avalanches were observed although visibility was not great. Some whoomphing was heard at treeline.
Confidence
Problems
Wind Slabs
30 cm HSt and westerly winds producing wind slabs on lee aspects down into treeline elevations. Wind slabs are touchy and are reactive to skier triggering.
Aspects: North, North East, East, South East.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Deep Persistent Slabs
Although no recent natural avalanches has been observed on this layer, this still is a significant interface to be aware of. Latest storm inputs may make this layer close to being overloaded. Easy to mod shears found on this layer at Bow Summit .
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Nov 21st, 2012 4:00PM
