Avalanche Forecast
Issued: Feb 18th, 2012 9:52AM
The alpine rating is Wind Slabs, Loose Dry and Cornices.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Good
Weather Forecast
We're entering a more active pattern which should persist through the middle of next week.Sun: A ridge of high pressure rebuilds during the day allowing temperatures to cool slightly while winds ease and switch from the SW to NW. A bit of instability from Saturday's storm will produce the odd flurry, but skies should clear in the afternoon. Look for 1500m temps to climb to -2 during the day.Mon/Tue: A few weak systems pass over the region favoring west slopes. Nothing in the flow is particularly well organized, it's the kind of setup that has the potential to bring 5-10 cm a day. Precip totals will be quite variable throughout the region. 1500 m temps: High -3, Low -7
Avalanche Summary
Activity continues to be limited to thin windslabs in wind exposed locations and sluffing in wind sheltered locales.
Snowpack Summary
Five centimeters fell overnight Friday which makes for 10 of light density snow above the February 16th Surface Hoar. 20 cm of light density snow lies between the February 16th surface hoar and the February 8th weakness. Within that 20cm some places have at least one other layer of surface hoar that formed between snowfalls. Feb. 8th is used to describe a combination of weak layers: In most locations it marks a widespread surface hoar layer. On steep south & west facing aspects a crust that formed during the drought was also buried on Feb. 8th. This crust likely has a bit of faceting below it too, meaning that most terrain in the region has a weak layer 20 - 25 cm under the snow surface. Down below this problematic interface a well settled mid pack is in place. The exception is the eastern and southern parts of the region where deeper weaknesses and basal facets may still be a factor. In these areas, a low-probability/high-consequence condition exists. It should be noted that large cornices remain widespread throughout the region.
Problems
Wind Slabs
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Dry
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Cornices
Aspects: North, North East, East.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Feb 19th, 2012 9:00AM