Avalanche Forecast
Issued: Dec 22nd, 2019 5:00PM
The alpine rating is Wind Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeRecent snow and wind has promoted wind slab development at upper elevations.
Summary
Confidence
Moderate - Uncertainty is due to the limited number of field observations.
Weather Forecast
Sunday Night: Cloudy with clear periods. Alpine temperature -9 C. Moderate southwest wind.
Monday: Cloudy with isolated flurries, trace to 5 cm. Alpine temperature -6 C. Moderate southwest wind.
Tuesday: Cloudy with isolated flurries, trace to 5 cm. Alpine temperature -7 C. Moderate southwest wind with strong gusts.
Wednesday: Mainly cloudy. Alpine temperatures -7 C. Moderate south wind with strong gusts.
Avalanche Summary
There have been no recent reports of avalanche activity.
Snowpack Summary
15-30 cm of snow fell in the region early last week. Moderate south-southwesterly winds have since developed wind slabs, especially around ridge features and into the alpine.
Reports suggest there are 2 buried layers of surface hoar in the upper snowpack - one down 15-25 cm below the new snow, and another down 25-40. Where wind has scoured the snowpack, a crust from November is at or near the surface. In leeward terrain, a this crust is 40-60 cm deep, and may include surface hoar in sheltered openings up to treeline.
Older crusts can be found deeper in the snowpack and are generally breaking down. In areas with a relatively thin snowpack, the base of the snowpack likely consists of weak faceted grains.
Terrain and Travel
- Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
- Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.
- Make observations and assess conditions continually as you travel.
Problems
Wind Slabs
Recent new snow has been redistributed by wind blowing primarily from the southwest.
Aspects: North, North East, East, South East.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 23rd, 2019 5:00PM