Avalanche Forecast
Issued: Dec 19th, 2017 4:50PM
The alpine rating is Wind Slabs and Storm Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Moderate - Due to the number of field observations on Wednesday
Weather Forecast
WEDNESDAY: Cloudy with sunny breaks / wind moderate northwest / alpine temperatures -9 THURSDAY: Mainly cloudy with isolated flurries / wind moderate to strong north / alpine temperature -8Â FRIDAY: Mainly sunny /Â wind moderate north / alpine temperature -17
Avalanche Summary
Numerous natural loose dry avalanches to size 1.5 have been reported running in steep terrain. These have been running in the recently fallen new snow. That being said, as this recent new snow sitting on top of a variety of weak layers starts to settle, expect avalanche activity to increase. If you have any observations, please submit them to the Mountain Information Network (MIN).
Snowpack Summary
20-40cm of new snow accumulating through last weekend sits on a wide variety of old surfaces including large surface hoar (weak, feather-like crystals), hard crusts formed by sun or wind, and sugary facets. As the snow load builds and slab properties develop, it will be important to monitor how the new snow is bonding to the old surfaces. Most concerning would be areas that have seen previous surface hoar development, such as sheltered areas at and below tree line and sheltered northerly aspects in the alpine. Additionally, any steep solar aspects where the surface hoar may be sitting on sun crust should be considered areas where this weak layer may be very likely to trigger. A crust which was formed by rain in late November is a major feature in the snowpack and is down approximately 60-80cm at tree line elevations. Snowpack tests suggest the snow above is currently bonding well to it. Snowpack depth decreases rapidly below tree line. Look out for early season hazards such as rocks, stumps, and open creeks.
Problems
Wind Slabs
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Storm Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Dec 20th, 2017 2:00PM