Avalanche Forecast
Issued: Nov 22nd, 2013 8:18AM
The alpine rating is Persistent Slabs and Wind Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Fair - Due to the number of field observations
Weather Forecast
High pressure will dominate though the forecast period. This will bring warming temperatures, rising freezing levels and temperature inversions. Some forecasts suggest alpine temperatures could rise as high as 5 degrees celsius by Monday. Ridgetop winds will be light from the West and no precipitation is expected.
Avalanche Summary
During the storm earlier this week a widespread natural avalanche cycle in the alpine occurred. Size 2-3 slab avalanches were reported throughout the region. Recently, only smaller size 1-2 avalanches have been reported. However, isolated very large slab avalanches may occur naturally and could be rider triggered, especially in areas that didn't previously avalanche.
Snowpack Summary
Recent storm snow seems to be settling, but wind slab problems do exist. A surface hoar layer exists 60-120 cm down but seems to be spotty, and drainage specific. A bigger concern is a melt-freeze / rain crust that formed early October. This is generally found from 80-180 cm down, and was reactive earlier this week. Sugary facetted crystals have a poor bond above and below the crust. The crust seems to be widespread through the region. Northerly aspects may have a more predominant crust that that might allow for wider propagations and bigger avalanches, especially places that have smooth ground cover (glacier ice, grassy slopes, rock slabs etc.).
Problems
Persistent Slabs
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Wind Slabs
Aspects: North, North East, East, South East.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Nov 23rd, 2013 2:00PM