Avalanche Forecast
Avalanche Bulletin - Jasper National Park
Good skiing can be found close to treeline on sheltered north facing terrain as winter conditions persist. Evaluate specific terrain features before committing. Human triggered avalanches are possible.
Avalanche Problem 1: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Avoid steep convexities or areas with a thin or variable snowpack.
- Carefully evaluate big terrain features by digging and testing on adjacent, safe slopes.
Avalanche Problem 2: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Previous wind effect will be difficult to assess under new snow. Expect hardslabs in the alpine and at treeline. The cold has reduced the tension in these but caution is still warranted, especially as new snow arrives over the next few days.
Travel and Terrain Advice
- If triggered the wind slabs may step down to deeper facet layers resulting in larger avalanches.
Avalanche Problem 3: Cornices
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Cornice failure noted in Shangrila on Friday releasing a size 2.5 slab below.
Travel and Terrain Advice
- Minimize overhead exposure during periods of heavy loading from new snow, wind.
Avalanche Summary
No patrol Friday. A cornice triggered a size 2.5 slab in Shangrila area today. Skiers released a cornice to test Ullr / terminator chute #5 Wednesday and released a healthy size 2 avalanche on Wednesday. See the MIN report. This is a steep N facing chute dropping into Whistler creek drainage from the backside of Marmot basin.
Snowpack Summary
Wind slabs and wind effect is found in open areas treeline and above. The upper snowpack is a variable 25 to 80 cm thick slab that sits on weak FC crust layers in the mid-pack. Depth hoar persists near the ground.
Weather Forecast
Friday into Saturday may bring 8-12cm. Saturday will be cloudy and flurries, trace of snow, high -5, and SW 20km/hr gusting 60 winds, with 1700m freezing level. Sunday will bring flurries, 11cm of snow, low -5 and high -1 C, light SW winds, and 2100m freezing level. Monday will be flurries, 8cm of snow, low -10 and high -2 C.
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A slab up to 80cm thick overlies: weak faceted crystals (well developed in shallow areas), surface hoar (at, and just above treeline), and sun crusts ( on steep S and W aspects). Faceting has reduced slab strength below treeline and in shallow areas.