Avalanche Forecast
Avalanche Bulletin - Jasper National Park
Hazard will be increasing the next few days with warm temperatures, rain, snow at higher elevations, and strong winds.
Avalanche Problem 1: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.
Avalanche Problem 2: Storm Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Total new snow accumulations may reach 60cm by Friday.
Travel and Terrain Advice
- If triggered the storm slabs may step down to deeper layers resulting in large avalanches.
Avalanche Problem 3: Loose Wet
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
The distribution of this problem will be tied to the freezing levels. Rainfall may occur up into the alpine in the coming days.
Travel and Terrain Advice
- Carry avalanche safety equipment on ice climbs in avalanche terrain.
Avalanche Summary
A patrol on Monday's observed numerous fresh size 2's mainly at treeline but also a few noted in lower alpine locations. They ranged from 35-45 degrees, 100m wide, 20-40cm deep, and some ran down in to the runouts of larger avalanche paths. No patrol occurred on Tuesday.
Snowpack Summary
Incoming new snow, accompanied by strong winds and warm temps, will quickly form fresh slabs. These will fall on top of the 20-60cm of snow already burying the Oct 31 crust, which is a likely failure plane for persistent slab avalanches.
Weather Forecast
A strong moist southwest flow will drive the weather for the next few days.
Tonight: 16cm of snow, with alpine lows of -4, and mod-strong SW wind
Wednesday: 9cm of snow, alpine highs of +1, freezing level 2400m, and mod-extreme SW wind
Thursday: 26cm of snow, alpine highs of +1 and lows of -5, freezing level 2200m, mod-extreme SW wind
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Expect incoming snow to overload the Halloween crust. This may produce our first cycle of large avalanches this season.