Avalanche Forecast
Avalanche Bulletin - Jasper National Park
A firm slab, sitting over several persistent weak layers, can be found in isolated areas in the forecast region. Triggering it remains possible and would be a high consequence event.
Avalanche Problem 1: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Avoid shallow snowpack areas where triggering is more likely.
- Use conservative route selection, stick to supported terrain features, avoid overhead hazards.
Avalanche Problem 2: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Expect hardslabs in the alpine and a few softer slabs at treeline. The cold has kept these in check and helped them settle over the last few days but some caution is still warranted.
Travel and Terrain Advice
- The best powder will be found in sheltered locations at or below treeline.
- If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
Avalanche Summary
No patrol and nothing new reported Saturday. This past week we saw minimal natural activity yet it is still prudent to treat slopes that did not avalanche in the last cycle as suspect for human triggering.
Snowpack Summary
Current and previous Strong W and N winds have left wind slabs and wind effect in open areas. The upper snowpack has settled to form a cohesive stiff slab that is sitting on three persistent weak layers mid-pack (down 50 to 80cm) which can be found throughout the forecast region, and have produced many large avalanches that have run full path.
Weather Forecast
Sunday will be cloudy and flurries, 4cm of snow, and -11 with light gusting moderate West winds. Monday will be clouds with sun and flurries, trace snow, -16 to -12 and light gusting strong West winds. Tuesday will be similar to Monday.
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A stiff slab 50 to 80cm thick, sits over sun Crusts (south and west aspects), Surface Hoar (at, and just above treeline) and weak Faceted Crystals (very developed in shallow snowpack features) This is a dangerous problem that is difficult to avoid.