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Avalanche Forecast

Archived

Feb 22nd, 2020–Feb 23rd, 2020

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 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.

Regions

Glacier.

Watch for an increasing avalanche danger through the weekend as more storm snow loads the weak Feb 22 surface hoar layer.

Weather Forecast

5cm more storm snow expected this morning accompanied by moderate W wind then cloudy with a chance of flurries for the afternoon. Freezing levels rising to 1100m. Another 10cm of snow expected through the day on Sunday with SW winds light gusting to strong. Increasing avalanche danger through the weekend.

Snowpack Summary

15cm+ storm snow has now buried the February 22 surface hoar layer. This layer is widespread accept on steep solar aspects where sun crust has formed. On shaded slopes expect 30cm of soft snow over a well settled mid-pack. Storm snow hides variable stubborn wind slab in exposed alpine elevations along ridge-tops and exposed tree-line features.

Avalanche Summary

Three avalanches to size 2 observed in the highway corridor. MCR report of natural triggered windslab to size 2 out of the Asulkan Hut area from the last couple of days.

Confidence

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.