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Avalanche Forecast

Archived

Jan 29th, 2020–Jan 30th, 2020

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural and human triggered avalanches likely.

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

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.