Avalanche Forecast
Issued: Feb 20th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Persistent Slabs.
mbender,
Avalanche Canada
Overnight snowfall amounts Monday night are uncertain. That being said, moderate to strong winds will continue to build wind slabs in the alpine and treeline.
Summary
Confidence
Avalanche Summary
Most recent avalanche activity has been reported as size 1-1.5 windslabs in the alpine.
There was a report of a natural size 3 persistent slab avalanche in the Brandywine area on Saturday evening. This was on a northeast aspect at 1750m. More details can be found here.
Snowpack Summary
Recent new snow is being redistributed by moderate to strong winds blowing primarily from the southwest.
A crust that formed in late January with small facets above it, can be found at all elevations down 40-100 cm. This crust has been reactive to rider traffic in the Rhododendron and Pemberton Icefield area. Additionally, a crust with facets above, found 80-200 cm deep and 1900m and below in elevation has recently been reactive in the Brandywine area.
Weather Summary
Monday Night
Cloudy with flurries, accumulation 5-15cm. Wind moderate to strong west and southwest. Treeline temperature -4 °C. Freezing level 1000 m.
Tuesday
Mainly cloudy with scattered flurries, accumulation 3-5cm. Wind light to moderate northeast. Treeline temperature -6 °C. Freezing level 500 m.
Wednesday
Mainly cloudy. Wind light east and northeast. Treeline temperature -12 °C.
Thursday
Mix of sun and cloud. Wind moderate northeast wind. Treeline temperature -14 °C.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Be especially cautious as you transition into wind affected terrain.
- Wind slabs are most reactive during their formation.
- Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.
- Pay attention to cornices and give them a wide berth when traveling on or below ridges.
Problems
Wind Slabs
Recent new snow combined with moderate to strong winds from a variety of directions have promoted new wind slab formation on a variety of aspects.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
Two weak layers consisting of a crust with small facets above buried between 50 and 180cm deep, have been responsible for several large avalanches in the past two weeks. This problem seems to be more of an issue west of the Sea to Sky highway corridor.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Feb 21st, 2023 4:00PM
