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Archived

Avalanche Forecast

Mar 14th, 2016–Mar 15th, 2016
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
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
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: Northwest Inland.

Old wind slabs may still be reactive to human triggering.

Confidence

Moderate - Due to the number and quality of field observations

Weather Forecast

Spring like daily fluctuation in temperature. TUESDAY: isolated flurries, light southwest winds, 1200m freezing level. WEDNESDAY: partly cloudy with flurries, light west winds, 1000m freezing level. THURSDAY: mainly sunny, light southeasterly winds, 1000m freezing level.

Avalanche Summary

Avalanche activity has slowed since the weekend however cornices continue to collapse naturally.  Occasionally these collapsing cornices have triggered slabs on the slopes below.

Snowpack Summary

New snow is falling on widely wind effected surfaces in the alpine and at treeline. Moist snow can be found at lower elevations and on slopes that see direct sunlight.  In the north of the region a crust and/or surface hoar from early in March or late February can be found in the upper meter of the snowpack.  A deeper layer of surface hoar from early January can be found in isolated locations across the region between 60 and 140 cm down. There hasn't been any avalanche activity reported on this layer for a couple of weeks now and it is becoming less of a concern. In shallower areas the snowpack sits on a weak base layer of facetted snow. This layer has been sporadically active in the north of the region, responsible for several large avalanches in unsupported alpine terrain. Cornices are large and fragile.

Avalanche Problems

Wind Slabs

New snow will hide lingering wind slabs that may still be reactive to human triggering.
Be cautious as you transition into wind affected terrain.>Use ridges or ribs to avoid pockets of wind loaded snow.>

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 4

Deep Persistent Slabs

Isolated large avalanches failing on weak layers buried deeply in the snowpack remain a possibility especially given a heavy trigger like a falling cornice.
Be aware of the potential for full depth avalanches due to deeply buried weak layers.>Be aware of thin areas that may propogate to deeper instabilites.>

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 3 - 6