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Archived

Avalanche Forecast

Nov 24th, 2016–Nov 25th, 2016
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
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
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.

Storm snow and strong SW winds in the next 36 hours will increase avalanche danger. Be aware of changing conditions.

Weather Forecast

Flurries are expected today with the main bulk of the storm bringing 25-30cm tonight and early Friday morning. Freezing levels should remain below 1300m with moderate to strong SW winds. Saturday will be mainly cloudy with isolated flurries, freezing levels remaining around 1300m.

Snowpack Summary

This past week 70cm of snow fell at 1900m and is settling into a slab, which sits on the November 13 crust. Tests on this interface, and a stellar crystal layer above, indicate that in some areas the slab may have a poor bond and could be triggered by a person. Pockets of windslab are present in the immediate lee of alpine and ridge-top features.

Avalanche Summary

No new avalanche activity reported from yesterday.

Confidence

Due to the number of field observations

Avalanche Problems

Wind Slabs

Southerly winds have loaded lee slopes with pockets of windslab and built new, touchy soft cornices.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Use caution in lee areas. Recent wind loading has created wind slabs.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

Below the light and powdery surface snow a slab is developing, and it sits on a hard crust. Recent tests have shown that this interface is becoming one to watch. With the forecast storms expect it to be increasingly reactive.
Carefully evaluate big terrain features by digging and testing on adjacent, safe slopes.Choose regroup spots that are out of avalanche terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3