Avalanche Forecast
Issued: Dec 13th, 2011 8:58AM
The alpine rating is Wind Slabs, Loose Dry and Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Fair - Due to limited field observations
Weather Forecast
Wednesday: A weak ridge builds giving a dry day with some lingering cloud. Light westerly winds and temperatures to -8 with a chance of flurries overnight. Thursday: Flurries remain a possibility early in the day, but will likely dry out by afternoon. Continued westerly winds and temperatures reaching -5. Friday: Unsettled skies with more light winds and temps to -5.
Avalanche Summary
No new avalanches.
Snowpack Summary
Up to 20cm of new snow has fallen since the 10th of December. This overlies surface hoar, surface facets, old windslabs and sun crusts (on steep south through west aspects). Winds have been sporadic in this period, with some strong northerlies intermingled with the more dominant light to moderate westerlies. There are isolated new soft slabs in immediate lee locations and some surface sluffing in more protected areas where the surface hoar is more prominent. Moving forward, the avalanche danger will increase as the load increases (either by new snow or wind). Be locally aware of changes and if obvious signs of instability are present (cracking, whumphing, recent activity on adjacent slopes) or rapid loading is taking place (heavy snowfall or strong winds) then scale down your terrain choices accordingly.Deeper in the snowpack there is a rain crust buried between 20-35cm. This crust extends as high as 2200m and some faceting (weakening) has been observed around the crust. Deeper still, the early November surface hoar remains a layer of concern. Buried 100-150cm it is unlikely to trigger, but consequences of triggering would be a large (up to size 3.0) destructive avalanche.
Problems
Wind Slabs
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Dry
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 14th, 2011 8:00AM