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Archived

Avalanche Forecast

Jan 29th, 2020–Jan 30th, 2020
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
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
4: High
The avalanche danger rating below treeline will be high

Regions: Glacier.

Avalanche hazard will increase later in the day with incoming precipitation and gusting winds.

Weather Forecast

Light snow is expected today with up to 7cm of accumulation. Freezing levels rise to 1300m with an alpine high of -5.0.  Ridge winds SW-25km/h with gusts to 50km/h.

A subtropical storm laden with moisture arrives Thursday night. Expect 44cm of new snow Friday and 19cm Saturday with strong SW winds. Freezing levels rise to 1600m.

Snowpack Summary

Periods of moderate to strong southerly winds have created pockets of windslab on lee features, especially on northerly aspects. The mild temps are promoting settlement in the upper snowpack.

Avalanche Summary

2 natural size 2.5 avalanches were observed from steep north facing terrain in the highway corridor. A field team was able to ski cut a small size 1 avalanche in steep alpine terrain on the SE couloir of Mt Afton.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Wind Slabs

Light snowfall combined with periods of moderate to strong wind have loaded lee slopes. Pockets of wind slab exist in the alpine/upper tree-line. On Sat, 2 skiers were seriously injured in an avalanche they triggered in the Forever Young couloir.

  • Watch for stiffer feeling snow. Avoid areas that appear wind loaded.
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2