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Archived

Avalanche Forecast

Nov 28th, 2015–Nov 29th, 2015
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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

Sunshine and a strong temperature inversion with above freezing temperatures already at 2000m.  Expect an increasing avalanche danger especially on alpine solar aspects.

Weather Forecast

Sunshine and a strong temperature inversion in the alpine should be expected today.  Temperatures have been above freezing since mid-day yesterday at around the 2000m level.  Light northerly winds will not reduce these warming effects significantly.  High pressure is expected to be here until early next week.

Snowpack Summary

Reverse loading from earlier strong northerly winds have created windslab along the immediate lee on alpine solar aspects.  These slabs reside on suncrusts on steep solar aspects (S-SW) and surface hoar on other aspects.  Surface hoar was observed up to 1700m in the Hermit area with moist surface snow from 1900m to 2200m thanks to the inversion.

Avalanche Summary

Three size 1.5 slides were observed in the highway corridor yesterday. Point release activity was occurring on steeper solar aspects yesterday triggered by the warm inversion temperatures

Confidence

Avalanche Problems

Wind Slabs

Reverse loading from northerly winds has formed windslabs on southerly aspects.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3

Loose Dry

A strong temperature inversion at and above treeline today should result in widespread point release activity on solar aspects.
Be cautious of sluffing in steep terrain.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Deep Persistent Slabs

A weak facet layer resides at the base of the snowpack on alpine N-NE aspects.  Several large avalanches have occurred on this layer including the Bruin's ridge skier triggered slide earlier this month.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 1 - 4