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Archived

Avalanche Forecast

Jan 19th, 2018–Jan 20th, 2018
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
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
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
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
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
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.

Moderate danger means heightened avalanche conditions where human triggered avalanches are possible. Be cautious when traveling in complex terrain.

Weather Forecast

Trace amounts of precipitation expected through the weekend, winds will remain in the light to moderate rang and temperatures steady between -8 to -12.

Snowpack Summary

Newly formed windslabs on immediate lees at alpine and treeline elevations. In sheltered areas the upper snowpack consist of 20-30cm of soft slab over the Jan 6 surface hoar, this layer has been reactive in test results. The Dec 15 layer is still a concern 40-60 cm down. Much of the snowpack is facetted with little structure below treeline.

Avalanche Summary

Minimal avalanche activity reported today, Lake Louise ski patrol reported small skier triggered windslabs from loaded pockets at ridge crest.

Confidence

Avalanche Problems

Wind Slabs

Recent snow and accompanying winds have created windslabs at alpine and treeline elevations. Due to variable winds in the alpine expect the spacial distribution of this problem to be widespread.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

The Dec 15 layer continues to cause some uncertainty with forecasters. Few avalanche observations have been reported on this instability, though widespread cracking and whumphing is still occurring when traveling in the backcountry.
Choose conservative lines and watch for clues of instability.Watch for whumpfing, hollow sounds, shooting cracks or recent avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2