Avalanche Forecast
Issued: Feb 16th, 2012 9:00AM
The alpine rating is Wind Slabs and Cornices.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Fair - Forecast snowfall amounts are uncertain on Saturday
Weather Forecast
Overnight snowfall is expected to total about 5-10 cm in most of the region. Another ridge is forecast for Friday that should bring mostly clear skies and light winds during the day. The next Pacific frontal system is expected to move inland from the coast during the evening. Moderate snowfall combined with moderate southwest wind is expected during the morning, turning to flurries in the afternoon. Forecast amounts are about 5-10 cm total. Light flurries are expected to continue on Sunday.
Avalanche Summary
Some sloughing in steep terrain up to size 1.0 that are running fast in the combination of light new snow, large surface hoar, and near surface facets. A few areas have reported pockets of soft slab that are reactive at treeline up to size 1.0
Snowpack Summary
Flurries during the day on Thursday have brought the total amount of new snow to about 20 cm above the February 08 surface hoar and near surface facets. Some areas are reporting that thin new windslabs have developed in the alpine due to a period of moderate northerly winds on Monday. The surface hoar layer is at all elevations and aspects, and continues to grow due to clear cold nights. Some areas have reported a very light freezing drizzle that had mixed with some rimed stellars to form a thin soft crust above the recently buried surface hoar layer(120208 SH). Warm alpine temperatures and solar radiation have developed a melt-freeze crust on southerly aspects in the alpine and on all aspects below about 1300 metres. There is some concern regarding facetting below the crust due to recent cold nights. There are a couple of layers that are buried between 25-35 cm that give resistant planar results from tests when hard forces are applied. The mid pack is generally well settled and well bonded. Deeper weaknesses in the snowpack are less of a concern; however, in the southern end of the region there is still talk of basal facets as some operators are avoiding thin and rocky alpine features. This represents a very low probability-high consequence scenario. Large cornices are also widespread in the alpine.
Problems
Wind Slabs
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Cornices
Aspects: North, North East, East.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Feb 17th, 2012 9:00AM