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Archived

Avalanche Forecast

Nov 30th, 2021–Dec 1st, 2021
Alpine
5: Extreme
The avalanche danger rating in the alpine will be extreme
Treeline
5: Extreme
The avalanche danger rating at treeline will be extreme
Below Treeline
4: High
The avalanche danger rating below treeline will be high
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
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

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

Avalanche Problems

Storm Slabs

Rapid snow loading, rising temps, and strong SW winds will add more load to the existing 1+m thick storm slabs.

  • Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.
  • Avoid avalanche terrain during periods of heavy loading from new snow, wind, or rain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely - Certain

Expected Size: 2 - 3.5

Loose Dry

As the new snow piles up, expect touchy loose dry avalanches in steeper terrain. These can be especially problematic in / above terrain traps

  • Be careful of loose dry sluffing in steep, confined or exposed terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 1 - 2