Avalanche Forecast
Issued: Mar 8th, 2013 9:28AM
The alpine rating is Storm Slabs, Persistent Slabs and Loose Wet.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Poor - Timing, track, or intensity of incoming weather is uncertain on Sunday
Weather Forecast
Friday night and Saturday:Â The dominating feature is a ridge of high pressure over the whole province bringing warmer air (-1 in the alpine), freezing levels rising to 1700 m., clear skies and light NW winds. Sunday: The ridge is breaking down in the North and remains in the Southern part of the interior range. There is a chance of light precipitation for Sunday (5-10 mm) with winds picking up in the moderate range from the W. Temperatures are slightly cooler than Saturday.Monday: Another system which could deliver more precipitation is expected for Monday but the timing and intensity is still uncertain.
Avalanche Summary
Several soft slabs size 1 and 1.5 were triggered by skiers in the new snow (20-30 cm deep) and was running on the underlying crust or on the older snow interface. There was also several reports of sluffing in steep terrain.
Snowpack Summary
Warm temperatures and solar radiation forecasted for tomorrow will weaken the surface layer possibly triggering the recent storm slab (between 20-30 cm deep). This recent snow is sitting on an older snow interface above 2000 m. and on a melt freeze crust below that elevation. In much of the region, up to 80 cm snow overlies fairly well preserved surface hoar and sun crust. This interface is still producing sudden collapse results during snow tests. A cornice fall or an avalanche in the storm snow could definitely trigger this deeper instability, especially where the melt freeze crust does not exist above 2000 m.
Problems
Storm Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Persistent Slabs
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Wet
Aspects: North, North East, East, South East.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Mar 9th, 2013 2:00PM