Avalanche Forecast
Issued: Mar 23rd, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Deep Persistent Slabs, Persistent Slabs and Loose Dry.
matt,
Avalanche Canada
Conflicting weather forecasts are keeping us on the edge of our forecasting seats. Read the entire bulletin carefully. If we are blessed with a heavy snowfall in the next 2 days, expect a widespread avalanche cycle. The ratings & discussions in this bulletin reflect a 10-15cm snowfall.
Summary
Confidence
Low
Avalanche Summary
No new avalanches observed or reported over the past 24hrs.
Snowpack Summary
Crusts. We are seeing sun crusts and temperature crusts slowly creep onto all aspects and elevations. True north is hanging in there, but most other areas are showing signs of spring. Keep in mind these crusts are superficial at this point and don't signal a spring snowpack or any true increase in stability. A thin crust isn't enough to bridge the weaker layers just yet. If we do get a decent amount of snow tomorrow expect a poor bond with the existing crusts. A cold night and cloudy skies will almost guarantee the new snow will rest on a smooth, well frozen crust. Aside from that we still have windslabs up to 40cm that are active on north aspects and the Rockies' hallmark deep persistent weak layer to worry about.
Weather Summary
Place your bets! It looks like we will get some snow tomorrow but the jury is out on how much. Some forecasts say up to 20cm by tomorrow night and others say 3cm. This a huge difference and will effect the hazard very differently. Winds will decrease through the day and settle to light winds by early afternoon. Even ridge winds will be light. Temperatures will be steady around -8. Interestingly, some forecasts are calling for potential lightening mid afternoon!
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Minimize exposure to sun-exposed slopes when the solar radiation is strong.
- Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
- Cornices become weak with daytime heating or solar exposure.
Problems
Deep Persistent Slabs
This layer will not tolerate sudden loading. If by some miracle we do get 20-30cm expect an avalanche cycle that will likely involve this layer.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
On solar aspects this slab most likely is starting to sit on top of buried sun crusts on S-W aspects. On polar aspects the interface is facets and surface hoar.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Dry
Obviously this is new snow dependent. Any new snow will sit on a crust and likely sluff off. These sluffs may trigger slabs.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Mar 24th, 2023 4:00PM
