Avalanche Forecast
Issued: Mar 22nd, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Loose Wet and Deep Persistent Slabs.
mbender,
Avalanche Canada
The weather pattern changes after another sunny day on Thursday.
Minimize your exposure to steep, rocky terrain facing the sun during the warmest part of the day.
Summary
Confidence
Avalanche Summary
Several naturally triggered wet loose avalanches up to size 2 were reported on sunny aspects in the alpine.
Two naturally triggered large (size 2-2.5) deep persistent slabs were reported on northerly aspects in the alpine on Monday. One was triggered by a cornice fall in the Renshaw zone and the other occurred in the Premier range.
Snowpack Summary
Expect to find a melt-freeze crust on the surface of all aspects at treeline and below and on sunny aspects in the alpine. Solar radiation will break down the crust on sunny slopes throughout the day.
Lingering wind slabs may remain reactive to human triggers on northerly aspects in the alpine.
20-30 cm down there is a sun crust on sunny aspects and surface hoar (3-10 mm) on isolated shady and sheltered slopes.
The mid-snowpack is generally strong but the lower snowpack is a different story..
The November facets are still prominent at the base of the snowpack. They are showing signs of improving but this layer remains a significant concern in rocky, shallow, or thin to thick snowpack areas at treeline and above.
Weather Summary
Wednesday Night
Mostly clear / 20 km/h southwest ridgetop wind / Temperature at treeline around -7 C / Freezing level at valley bottom
Thursday
Mostly sunny / 20 km/h south ridgetop wind / Temperature at treeline around -4 C / Freezing level 1800m
Friday
Mostly cloudy with isolated flurries; 0-3 cm / 15 km/h southwest ridgetop wind / Temperature at treeline around -6 C / Freezing level 1400m
Saturday
Mostly cloudy with isolated flurries; 1-3 cm / 20 km/h southwest ridgetop wind / Temperature at treeline around -5 C / Freezing level 1200m
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet
- Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
- Cornice failure may trigger large avalanches.
- In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.
Problems
Loose Wet
Strong solar radiation will increase the likelihood of wet loose avalanches on sunny aspects in the alpine.
Aspects: South East, South, South West, West.
Elevations: Alpine.
Likelihood
Expected Size
Deep Persistent Slabs
A weak layer of facets exists near the base of the snowpack. The likelihood of human triggering is low given the layer's depth, but large triggers such as cornice failures or smaller avalanches in motion have the potential to produce very large avalanches with surprisingly wide propagation. Suspect terrain for human triggering includes steep, shallow, and rocky terrain where the snowpack transitions from thin to thick.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Mar 23rd, 2023 4:00PM
