Avalanche Forecast
Avalanche Bulletin - Jasper National Park
Highway 93N from Athabasca Falls to Saskatchewan River Crossing and the Maligne Lake road will remain closed for Friday. Check Alberta 511 for updated opening times.
Avalanche Problem 1: Storm Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Avoid all avalanche terrain
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Field teams observed widespread whumpfing and moderate test results at TL during the past week. Shallow areas are the most likely triggering locations in the alpine.
Travel and Terrain Advice
- Watch for whumpfing, hollow sounds, and shooting cracks.
- Avoid convexities or areas with a thin or variable snowpack.
Avalanche Problem 3: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Windslabs were created over the last week with 40cm of snow and West winds. The incoming snow coupled with moderate West winds may build sensitive new storm / windslabs.
Travel and Terrain Advice
- If triggered the storm/wind slabs may step down to deeper layers resulting in large avalanches.
- Watch for shooting cracks or stiffer feeling snow. Avoid areas that appear wind loaded.
Avalanche Summary
Epic avalanche cycle through the forecasted region up to size 3.5. Most active at 2400m to 2600m (TL elevation). Expect the same carnage in the alpine but unable to confirm due to poor visability.
Snowpack Summary
Varied HST amounts building soft storm slabs through the forecast region, up to 45cm in the southern region on Mount Wilson; 10-15cm in the Icefields. This storm slab is sitting on the weak facetted persistent slab and is running far and fast to valley bottom. Reverse loading from north to south on ridge tops and open areas.
Weather Forecast
Storm to ease overnight on Thursday, clearing Friday morning and sunny with cloudy periods over the day. Light northerly winds and alpine temperatures near -10.
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Up to 45cm of HST fell through the forecast area, over-loading the already weak persistent slab and running far and fast.