Avalanche Forecast
Issued: Dec 4th, 2011 9:06AM
The alpine rating is Wind Slabs and Storm Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Poor - Due to limited field observations
Weather Forecast
A radical above freezing layer is forecasted for Sunday night into Monday. Freezing levels as high as 2800m are possible. A cold front sweeps across the NW coast bringing as much as 30mm to the more coastal locations Monday afternoon as ridgetop winds build to 80 - 95 km/h out of the W. Freezing levels lower Monday as the cold front moves inland.Cold post frontal air keeps the region dry & cool on Tuesday. Ridge of high pressure rebuilds Wednesday & Thursday with an outflow pattern. Another above freezing layer is forecasted for later in the week.
Avalanche Summary
Natural and explosive controlled avalanches up to size 4.0 releasing in the storm snow. Some of the larger releases have been from glide avalanches. Most of this activity is in the West of the region closer to the coast. We don't have any new reports from the Interior.
Snowpack Summary
Very strong W-SW winds have probably wreaked havoc in any exposed terrain. Expect to find scoured areas, sastrugi, and hard or stiff wind slabs. The average snowpack depth at treeline is over 200cm. The mid and lower snowpack are generally quite strong. Watch for clues of instability like whumpfs or shooting cracks, and if observed back off any steeper objectives.
Problems
Wind Slabs
Aspects: North, North East, East, South East, South, South West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Storm Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Dec 5th, 2011 8:00AM