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Archived

Avalanche Forecast

Dec 18th, 2016–Dec 19th, 2016
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
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
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

A slow warming trend is underway.  Warming temperatures and a pulse of snow forecast to start tonight will raise the avalanche hazard significantly.

Weather Forecast

Mainly cloudy with isolated flurries.  Alpine temperatures should reach a balmy -13C accompanied by moderate SW winds.  A pulse of moisture tonight through Tuesday will lead to an increasing avalanche danger.

Snowpack Summary

Continued moderate S'ly winds are developing thin windslabs in the immediate lee of ridges and along alpine slopes. These slabs are forming over the hard windslabs that formed when the arctic high pressure moved in. Flurries will be falling on needle like surface hoar in many locations below treeline.

Avalanche Summary

Three slab avalanches ranging from size 1-2.5 were recorded in the highway corridor yesterday.

Confidence

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

Avalanche Problems

Wind Slabs

Freshly formed windslabs brought on by moderate S'ly winds and light snowfall should be watched for in the immediate lee of ridges and alpine terrain features.  These slabs will hide hard slabs formed during the arctic high pressure.
Be cautious as you transition into wind affected terrain.Be careful with wind loaded pockets

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3