Avalanche Forecast
Issued: Mar 10th, 2012 9:50AM
The alpine rating is Wind Slabs and Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Fair - Intensity of incoming weather is uncertain on Sunday
Weather Forecast
Sunday: light snowfall - light southerly winds - freezing level at 400m Monday: trace amounts of snow with some clearing- light southeast winds - freezing level at 400m Tuesday: very light snowfall - light southwest winds - freezing level at 200m
Avalanche Summary
A size 1.5 natural wind slab avalanche was reported on Friday on a cross-loaded slope at treeline. Storm snow avalanches up to size 3.5 were reported from the big terrain around Bear Pass. A few natural size 2 slab releases on the early February persistent weak layer interface were reported on Thursday. They occurred below treeline on steep, unsupported terrain.
Snowpack Summary
Continued strong westerly winds have created widespread reactive wind slabs on lee aspects. A persistent weak layer of surface hoar buried at the beginning of March is as much as 70cm deep and has started to become reactive in some areas. The early February persistent weak layers (surface hoar, facets, crusts) are buried as much as 110cm down and also remain a concern in some parts of the region. Although not widespread throughout the region, persistent slabs would be destructive in nature and may be reactive to human triggers, particularly below treeline on isolated and sheltered steep terrain where buried surface hoar may be preserved. Cornices in the region are reported to be large and unstable.
Problems
Wind Slabs
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Mar 11th, 2012 9:00AM