Avalanche Forecast
Issued: Mar 25th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Deep Persistent Slabs and Persistent Slabs.
TH,
Avalanche Canada
Unstable air has brought convective flurries to the forecasting region over the last couple of days.
Expect bouts of both cloudy skies with intense snowfall and poor visibility, as well as sunny skies that can yield moist snow very quickly.
Human triggering of the persistent and deep persistent layers remains the main concern.
Summary
Confidence
Moderate
Avalanche Summary
No new avalanches were observed or reported Saturday.
Snowpack Summary
5-15 cm of snow fell March 24 to bury temperature crusts to 1600m, sun crusts to ridgetop on solar aspects and facets on shaded slopes.
The middle of the snowpack holds several crust and facet layers.
The base of the snowpack is weak, unconsolidated depth hoar in almost all areas.
Cornice failures occur regularly at this point of the season.
Weather Summary
Cloudy skies will start to clear into Sunday morning with the potential for a few flurries giving way to the potential for sunshine in the afternoon. Cloud will re-build overnight Sunday, again with the potential for flurries. Freezing levels will reach 1500m Sunday with further cooling for Monday. Alpine winds will remain light Sunday but may just touch into moderate on Monday.
Terrain and Travel Advice
- Uncertainty is best managed through conservative terrain choices at this time.
- Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.
Problems
Deep Persistent Slabs
The weak depth hoar at the bottom of the snowpack inspires little confidence. Give careful consideration to the slopes overhead as large avalanches may run well into the runout zone or into lower-angle terrain. Avoid big terrain features and be especially cautious in thin or rocky areas, where triggering is more likely.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
Three persistent weak layers formed in January are down 40-110 cm. The buried sun crusts on steep solar slopes that have been the greatest concern for triggering are now covered by surface crusts making triggering in these locations less likely. Meanwhile the weak facets that can be found on these same interfaces on shaded aspects remain a concern.
Aspects: North, North East, East, West, North West.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Mar 26th, 2023 4:00PM
