Avalanche Forecast
Issued: Feb 1st, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Deep Persistent Slabs.
BW,
Avalanche Canada
The deep persistent problem remains a problem. Continue to exercise conservative terrain choices.
Summary
Confidence
Avalanche Summary
Ski hills reported small windslabs with ski cutting and explosives on Wednesday. In the past few days, in Yoho, a deep persistent slab avalanche was observed on Mt. Carnarvon (size 3) and on Mt. Field (size 2.5). These avalanches illustrate the unpredictability of the deep persistent problem that exists in the snowpack.
Snowpack Summary
Moderate to strong west winds have formed wind effect and fresh wind-slabs at alpine and tree-line elevations. The upper snowpack has a weak interface down 20-40 cm on the Jan 4 surface hoar/suncrust layer. The Nov 16 deep persistent layer is down 40-90 cm and continues to produce variable sudden test results. The mid and lower pack is weak in eastern regions and more supportive in western areas.
Weather Summary
Cloudy skies with light flurries along the continental divide on Thursday morning will taper as a surface ridge builds bringing a clearing trend in the afternoon.
Winds will remain strong from the west with alpine temps in the -5 to -10 range on Thursday.
More details can be found in the Mountain Weather Forecast
Terrain and Travel Advice
- Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
- In times of uncertainty conservative terrain choices are our best defense.
Problems
Wind Slabs
Moderate to strong W winds have formed wind effect and fresh wind slabs in the alpine and treeline elevations. These wind slabs have been reactive to skier triggering.
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Deep Persistent Slabs
The lower snowpack is comprised of weak facets and depth hoar with the upper snowpack forming a 40 to 90 cm thick slab above the weakness. Human triggering on this layer remains a concern.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Feb 2nd, 2023 4:00PM
