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Avalanche Forecast

Archived

Feb 23rd, 2020–Feb 24th, 2020

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

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

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.