Avalanche Forecast
Issued: Feb 17th, 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.
trettie,
Avalanche Canada
Carefully assess for wind slab as you move through terrain. Be especially cautious in shallow snowpack areas where triggering a deep persistent slab remains possible.
Summary
Confidence
Moderate
Avalanche Summary
One natural size two deep persistent slab was reported on Thursday in the northern part of the region. It was on a northeast aspect in the alpine. Deep persistent slab avalanches like this one continue to be reported atleast once a week in shallow snowpack areas.
Snowpack Summary
Up to 35cm of snow has fallen with moderate to strong southerly winds. This most recent snow has buried a variety of surfaces including small surface hoar and old wind effected surfaces. windward slopes are generally scoured or pressed with wind slab found on north and east aspects.
Several layers of facets, crusts or surface hoar can be found in the top 1.5 meters of the snowpack.
In shallow snowpack areas layers of facets from November and December are near the bottom of the snowpack and have likely been responsible for some large avalanches.
Weather Summary
Friday Night
Cloudy with up to 5cm of new snow expected. Moderate to strong northwest winds and a low of -5 at 1500m.
Saturday
Cloudy with up to 10cm of new snow expected. Moderate to strong northwest winds and a high of -2 at 1500m.
Sunday
Cloudy with up to 10cm of new snow expected. Strong westerly winds and a high of -2 at 1500m.
Monday
Cloudy with flurries bringing a few centimeters of new snow. Light north wind and a high of -5 at 1500m.
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.
- Recent wind has varied in direction so watch for wind slabs on all aspects.
- Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.
- Avoid areas with a thin or variable snowpack.
Problems
Wind Slabs
AS the winds shift to a more westerly direction wind slabs could be found on all aspect.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Deep Persistent Slabs
Over the past few weeks we have recieved reports of large deep persistent slab avalanches. Triggering an avalanche on deeply buried facets is unlikely but very consequential. Avoid shallow, steep and rocky start zones at treeline and above where triggering a deep persistent slab could be possible.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Feb 18th, 2023 4:00PM
