Avalanche Forecast
Issued: Nov 28th, 2019 8:03AM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Persistent Slabs.
Percy Woods,
Parks Canada
The Winter Permit System is now in place, keep this in mind in your trip planning. Cold temperatures and short days , plan accordingly.
Summary
Weather Forecast
A cold clear day is forecast with continued North through East winds bringing arctic air into the forecast area. No precipitation is forecasted and freezing levels will stay well below valley bottom. It will be cold and clear tonight and right through to the weekend.
Snowpack Summary
Strong Northerly winds have redistribute last weekend's storm snow on alpine and treeline lee features, caution, reverse loading. Cold temperatures should soften former surface slabs in protected areas. The 2 main layers to watch for are the Nov 23rd Surface Hoar, buried 30-50-cm, and the Nov 17th interface.
Avalanche Summary
Limited natural avalanche activity observed yesterday, one size 1.5 slab release in Lone Pine in the highway corridor. Sunday's storm produced a decent natural avalanche cycle to size 3 in Rogers Pass. Avalanche activity has tapered off since the end storm.
Confidence
Problems
Wind Slabs
Look for freshly formed windslab in the immediate lee of ridgelines on S through W aspects in the Alpine and Treeline.
- Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
- Have an eye for reverse loading from North through East moderate winds.
Aspects: South East, South, South West, West, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
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.
- Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Nov 29th, 2019 8:00AM
