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Archived

Avalanche Forecast

Mar 5th, 2017–Mar 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
2: Moderate
The avalanche danger rating at treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Little Yoho.

Avalanche control on Mt Bosworth (March 6,2017), no backcountry recreation in this area.

A reactive storm slab has produced large avalanches through the forecast region.

Weather Forecast

Flurries are expected through to Tuesday with 5-10cm of snow accumulation, light to moderate winds from the west will continue and temperatures will remain below freezing.

Snowpack Summary

20-40cm from the past storm with less in the western parts of the forecast region. This new snow has developed a reactive storm slab overlaying a supportive mid pack. In thin areas the lower snowpack is weak, consisting of facets and depth hoar.

Avalanche Summary

Reports of natural avalanches to size 2.5 initiating from storm slabs at alpine and tree line elevations. In isolated cases these avalanches have stepped down to the deep persistent problem. In neighboring forecast regions, remote triggered avalanches have occurred on the storm slab by skiers and explosives.

Confidence

Avalanche Problems

Storm Slabs

20-40cm of new snow has settled into a reactive storm slab. Human triggering will be likely for the next day or two.

  • The new snow will require several days to settle and stabilize.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Persistent Slabs

Be conservative with your terrain choices, especially when entering larger, steeper features. Dig down to see if the January surface hoar or the December facets are present and take appropriate precautions if they are.

  • Dig down to find and test weak layers before committing to a line.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3