Avalanche Forecast
Issued: Dec 23rd, 2022 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs and Persistent Slabs.
dsaly,
Avalanche Canada
Snowfall intensities Saturday morning could produce rates of over 6 cm snowfall per hour! With heavy snowfall and strong wind, expect storm slabs to build in size and sensitivity through the day.
Summary
Confidence
Moderate
Avalanche Summary
Friday explosives control work trigger size 1-2 slab avalanches up to 20 cm deep.
Please continue to post your observations and photos to the Mountain Information Network.
Snowpack Summary
A fresh 10-15 cm snow accumulated Friday morning and buried a layer of weak, sugary, unconsolidated snow produced by the recent cold weather.
A number of layers persist deeper in the snowpack, consisting of facets, surface hoar, and crusts.
Total snow depths are roughly 90-140 cm at treeline and up to 200 cm in the alpine.
Weather Summary
Friday night
Snow, 15-25 cm overnight. Alpine temperatures rise to -4 C by morning. Southwest wind 25-45 km/hr. Freezing level rising to 900 m.
Saturday
Heavy precipitation, strong winds, and rising freezing levels are forecast throughout the day. Expect to encounter a variety of precipitation forms including freezing rain at roadside elevations.
Heavy snowfall, 30-50 cm. Alpine high temperature -2 C. Ridgetop winds southwest 40 gusting to 75 km/hr. Freezing level rising to 1500-1700 m.
SundaySnow, wet flurries, or freezing rain, 15-30 cm. Alpine high temperature 0 C. Ridgetop winds southwest 30-60 km/hr. Freezing level rising above 2000 m.
MondaySnow, wet flurries, or rain, 50 mm. Alpine high temperature 0 C. Ridgetop winds southwest 40 gusting to 90 km/hr. Freezing level 2000 m.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
- Dial back your terrain choices if you are seeing more than 25cm of new snow.
- Storm slabs in motion may step down to deeper layers resulting in large avalanches.
Problems
Storm Slabs
Snowfall intensities Saturday morning could produce rates of over 6 cm snowfall per hour! With heavy snowfall and strong wind, expect storm slabs to build in size and sensitivity through the day.
With freezing levels forecast to rise over the weekend, watch for rain falling on snow and saturating the snowpack. In the case of wet avalanches, the first 24 hours of rain-on-snow are the most hazardous as large, destructive avalanches are most likely to occur.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Persistent Slabs
A crust with weak, facetted snow above and below is buried by roughly 50-150 cm of snow. This layer is unlikely to be human-triggered, the forecasted rapid and heavy load of new snow will stress the snowpack and may provide more insight into the dormancy of this deeper instability.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 24th, 2022 4:00PM
