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Archived

Avalanche Forecast

Jan 20th, 2018–Jan 21st, 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

Highs of -5 to -8C at valley bottom and -10 to -12C  at upper elevations Sunday.  3000m winds will be strong from the SW and light at valley bottom.  Only a couple few cm of snow is expected along the divide and less to the East.

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, which 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

No new avalanches observed or reported today

Confidence

Avalanche Problems

Wind Slabs

Recent winds and snow have formed slabs in immediate lees.  Pay attention to the surface texture and local wind transport as these will be the biggest indicator of their formation.
Avoid freshly wind loaded features.

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.
Watch for whumpfing, hollow sounds, shooting cracks or recent avalanches.Choose conservative lines and watch for clues of instability.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2.5