Avalanche Forecast
Avalanche Bulletin - Jasper National Park
The first warming trend of late winter has begun so expect increased reactivity in the afternoon.
Avalanche Problem 1: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Best conditions found on sheltered aspects.
- Watch for surface cracking and stiffer surface layers of snow.
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
A cold, facetting, and structurally weak slab up to 80cm thick overlies faceted crystals (well developed in shallow areas). Low elevations will present as a loose dry avalanche problem.
Travel and Terrain Advice
- Be wary of slopes that did not previously avalanche.
- If triggered dry loose point releases can form deeper deposits in terrain traps.
Avalanche Summary
Some solar triggered loose dry avalanches to sz 2 throughout the forecast zone. Yesterday ridgetop windslab avalanches were triggered with small explosives near Marmot peak.
Snowpack Summary
Surface facetting has weakened much of the upper snowpack through the forecast region. The upper snowpack is generally 50 to 80 cm, over the seasonally persistent instability. Wind slabs and wind effect in open areas in the alpine and treeline elevations.
Weather Forecast
Weather over the next week should remain a stable pattern. Cool overnight and temps rising to single digits over the day. Chance of scattered flurries with up to 10cm on Friday. Temps and freezing levels will rise into the weekend with increased solar radiation, so bring sunscreen.
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Expect windslabs in the alpine and at open treeline. The cold has reduced slab conductivity, and the probability for long propagations. Caution is still warranted on exposed or extreme terrain features.