Avalanche Forecast
Issued: Dec 12th, 2012 9:25AM
The alpine rating is Wind Slabs and Deep Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Fair - Due to limited field observations
Weather Forecast
A weak system will cross the region during Thursday and bring light precipitations and moderate to strong winds from the South West. Temperatures will stay cool for the entire period. Friday should see some sunny periods with lighter winds from the North West. Later Saturday, another upper trough is expected to spread moderate snow accumulations over the region with moderate winds from the South.
Avalanche Summary
Several natural slab avalanches up to size 2 have been reported on various aspects in the storm snow. A few skier triggered loose dry avalanches have also been reported on steep terrain.
Snowpack Summary
30 cm of fresh snow has been transported by West and South West winds in the alpine and treeline creating the windslab problem on lee slopes. It has been reported that these windslabs are reactive under the weight of a skier. In sheltered areas, this new snow could also be burrying older and deeper windslabs in the alpine. Sluffing is still an issue on steep features protected from the wind below treeline. Below treeline, also watch for early season obstacle, such as stumps and creeks. The deep persistent instabilities (surface hoar and early November crust) located in the middle and near the bottom of the snowpack are still a concern in this region, however, we haven't had report of their sensitivity or reactiveness. Digging down and making your own observations will be critical to safe slope selection. Any observations from the field are welcome at forecaster@avalanche.ca.
Problems
Wind Slabs
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Deep Persistent Slabs
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 13th, 2012 2:00PM