Avalanche Forecast
Issued: Jan 14th, 2013 10:28AM
The alpine rating is Persistent Slabs and Wind Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Poor - Timing, track, or intensity of incoming weather is uncertain
Weather Forecast
Monday night and Tuesday: A high pressure dominates the weather bringing clear skies in the alpine and valley clouds because of the inversion. Alpine temperatures should rise above or near near zero degrees and winds are forecasted to be strong from the West. Wednesday: The high pressure weakens allowing light precipitation. Freezing levels will be around 700 m. and moderate winds from the West.Thursday: Similar conditions expected with slightly more precipitation forecasted, strong West winds and warm temperatures.
Avalanche Summary
A few recent natural slab avalanches up to size 2 and a skier triggered avalanche size 1.5 were reported. The failure plane was the late December surface hoar.
Snowpack Summary
The surface hoar layer down 60-80 cm has started to be reactive in some areas with the warming. There is also signs of intense wind effect in the alpine by recent strong NW winds leaving shallow areas and hard windslabs on lee side of ridges. The continuing warming and solar radiation forecasted for tomorrow will maintain the weakening of the snowpack trend. Read the forecaster's blog to learn more about this process. Triggering a surface instability could step down to the deeper persistent instability creating bigger avalanches. A strong mid-pack overlies a weak base layer of facets and the early November crust. Even though the crust has been unreactive for a while, professionals are concerned about it again with the warming which could awake it, especially in shallow areas at treeline and in the alpine.
Problems
Persistent Slabs
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Wind Slabs
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Jan 15th, 2013 2:00PM