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Archived

Avalanche Forecast

Apr 27th, 2018–Apr 28th, 2018
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Glacier.

Avalanche control will take place early this afternoon in the highway corridor. The winter permit system remains in place and all permit areas are closed today.

Weather Forecast

The forecast calls for sunny with cloudy periods, an alpine high of +10C, light east winds and a freezing level of 3700m. Tonight the alpine low is forecast for +9C with a weak temperature inversion. Saturday calls for isolated showers and  a freezing level of 3400m.

Snowpack Summary

We are into a melt freeze cycle. This morning we had a minimal recovery with temperatures just below zero at valley bottom and less of a recovery higher with an overnight inversion and temperatures of 6C at 1900m at 0700. There may be some dry snow on North aspects above 2400m. Cornices are large and will weaken with the rising temperatures.

Avalanche Summary

Numerous natural avalanches to size 3 and artillery controlled avalanches to size 3 yesterday.

Confidence

Avalanche Problems

Loose Wet

With little to no overnight refreeze the snowpack  will destabilize quickly as  temperature climbs today. Small releases or snowballs can gain mass to become large avalanches with today's conditions.
If triggered the loose wet sluffs may step down to deeper layers resulting in large avalanches.Travel early before the heat of the day, minimize exposure to overhead avalanche terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 1 - 3

Cornices

Cornices are large and becoming weakened by daytime heating and solar input. Remember that even on a shaded aspect, the sun is still baking the back of the cornice.
Minimize exposure to corniced features.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3