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Archived

Avalanche Forecast

Feb 25th, 2018–Feb 26th, 2018
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
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
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.

Fresh storm snow is forming soft storm slabs at and above teeline. Recently formed windslab will now be hidden by storm snow.

Weather Forecast

20cm of storm snow in the last 24hrs at 1900m with another 10cm expected this morning. Ridge winds will be moderate gusting to strong from the west. Cloudy with clear periods this afternoon into Monday with moderate southwest winds at ridge line.

Snowpack Summary

20cm of storm snow with mod S winds forming soft slabs along lee of ridges. Storm snow landing on a facetted old snow surface making for a weak bond. Previous strong N'ly and recent mod S'ly winds have added to cornice growth. Old windslab can be expected in the alpine. On solar aspects, a crust is buried 40cm. PWL from Jan now buried 150-200cm

Avalanche Summary

No new avalanche observations from the past 48 hours in the highway corridor. Field team was able to release loose dry 0.5 size avalanches off of steep unsupported convexities at treeline yesterday. The slides moved slowly and did not run far.

Confidence

Forecast snowfall amounts are uncertain

Avalanche Problems

Storm Slabs

Moderate S'ly winds and 20cm of storm snow all landing on a facetted old snow surface should make for reactive storm slab at and above treeline.  Lingering windslab is also a concern and will be hidden under the new snow.
Minimize overhead exposure during periods of heavy loading from new snow, wind.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2.5

Loose Dry

Storm snow is landing on a facetted old snow surface. In steeper terrain expect surface sluffing, which can be an issue in terrain traps such as gully features.
If triggered dry loose point releases can form deeper deposits in terrain traps.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2