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Archived

Avalanche Forecast

Feb 23rd, 2020–Feb 24th, 2020
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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

The Avalanche WRA is CLOSED today. Please respect this closure.

Carefully assess slopes for reactivity of the freshly buried Feb 22nd surface hoar/ sun crust. 

Weather Forecast

Today: 6cm precip + more with convective activity. Freezing levels 1300m. Winds gusting up to 50km/h from the west.

Tonight: Mainly cloudy with isolated flurries. Freezing levels lowering to 600m. Winds SW 20-35km/h

Tomorrow: An upper level ridge moves in, bringing a mix of sun and cloud. Freezing level 1000m. Winds west 20-30km/h

Snowpack Summary

25cm+ storm snow has now buried the February 22 weak layer. This layer consists of surface hoar (observed up to 2300m) in sheltered areas and a sun crust on solar aspects. In some locations, the surface hoar may be sitting on a sun crust. On shaded slopes expect 30cm of soft snow over a well settled mid-pack.

Avalanche Summary

A widespread natural avalanche cycle occurred yesterday on all aspects and elevations, with some very large avalanches (size 3.0) reaching valley bottom. These avalanches were failing on the Feb 22nd surface hoar/ sun crust layer.

Confidence

Due to the number of field observations

Avalanche Problems

Storm Slabs

Developing storm slab over the freshly buried Feb 22 surface hoar/ sun crust.  Although the new slab is very soft, human triggering of the fresh storm slab is likely on steep features and in wind affected areas.

  • Watch for surface cracking and stiffer surface layers of snow.
  • Carefully assess open slopes at and below treeline where buried surface hoar may be preserved.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2.5