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Archived

Avalanche Forecast

Feb 5th, 2017–Feb 6th, 2017
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Banff Yoho Kootenay.

Storm slabs are expected to become touchy with additional snow on Sunday and Monday.

Weather Forecast

The storm will persist a bit longer. The forecast region is expecting up to another 10cm overnight, perhaps less in Western areas. Additionally, the temperature is going to dive down to -30 tomorrow, and creep back up later in the week. The wind will be variable in direction into the moderate range through Tuesday.

Snowpack Summary

Storm snow amounts are 10 to 30cm. This sits on harder wind pressed surfaces from previous strong W/SW winds at treeline and above. Surface hoar may be found buried in sheltered locations. Generally the midpack is weak at TL and above, and the entire snowpack is weak BTL. Near the divide, deeper snow-packs are a bit stronger and more supportive.

Avalanche Summary

Some small size 1 avalanches were reported on Mt. Dennis (Dennis 1 slide path) and from the Lake Louise ski area.

Confidence

Forecast snowfall amounts are uncertain on Monday

Avalanche Problems

Deep Persistent Slabs

The snowpack is weak. Slopes where a slab sits over the deeper weak layers should be treated as suspect. Increasing load and further slab development will make these slabs more sensitive Monday and Tuesday.
Be aware of thin areas that may propogate to deeper instabilites.Use conservative route selection, choose moderate angled and supported terrain with low consequence.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3

Storm Slabs

Small in size currently, watch locally for their formation and the bed surface they are lying on. There are wind layers, facets, surface hoar and sun crust depending on location.
Keep an eye out for reverse loading created by an upslope storm.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2