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Avalanche Forecast

Archived

Nov 30th, 2021–Dec 1st, 2021

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

Regions

Glacier.

Avoid all avalanche terrain Wednesday.

This is not the time to be in the backcountry.

Weather Forecast

A warm, wet one is getting planted on Rogers Pass' face!

Tonight: Snow, 20cm, FZL 1500m, mod / gusting strong SW winds

Wed: Snow, 25-30cm, FZL 2100m, strong / gusting extreme SW winds

Thurs: Scattered flurries, 5cm, FZL 1600m, light / gusting strong W winds

Fri: Cloudy with sunny periods, Alpine high -10*C, light W winds

Snowpack Summary

Heavy storm slabs, 1+m thick and growing, are widespread at all elevations. The mid to lower snowpack is generally rounded and well bonded. Tree-line and below tree-line travel is difficult, with extremely dense new snow from warm temps (think skiing in elephant snot, gross!). Early season hazards still linger below 1700m.

Avalanche Summary

After a slow day for avalanches Monday, the mountains are shedding once again. Numerous natural avalanches to sz 3 have been detected in the highway corridor Tuesday, and many more are certain to come tonight/Wednesday with the building storm intensity, rising temps, and winds.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.