Archived

Avalanche Forecast

Feb 28th, 2015–Mar 1st, 2015

Alpine

2: Moderate

The avalanche danger rating in the alpine will be moderate

Treeline

1: Low

The avalanche danger rating at treeline will be low

Below Treeline

1: Low

The avalanche danger rating below treeline will be low

Alpine

1: Low

The avalanche danger rating in the alpine will be low

Treeline

1: Low

The avalanche danger rating at treeline will be low

Below Treeline

1: Low

The avalanche danger rating below treeline will be low

Alpine

1: Low

The avalanche danger rating in the alpine will be low

Treeline

1: Low

The avalanche danger rating at treeline will be low

Below Treeline

1: Low

The avalanche danger rating below treeline will be low

Regions: Northwest Inland.

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Confidence

Poor - Due to the number of field observations

Weather Forecast

Apart from some light snow or flurries on Sunday, the next few days look dry and cool. Winds are moderate to strong from the north quarter (although wind direction will vary locally).

Avalanche Summary

Avalanches are generally unlikely, but small loose sluffing from steep sun exposed slopes is possible during warm parts of the day. Cornice fall and thin wind slabs may be triggered by people. Last week several full-depth avalanches up to size 3 were observed on all but north aspects. As we get increased sun and warming, these types of large isolated avalanches could once again become a problem.

Snowpack Summary

Cornices may be sensitive to warm temperatures. Wind slabs may be lurking on slopes lee to outflow winds. A dusting of recent snow may overlie old variable snow surfaces including wind slabs, a sun crust or old rain crust, surface hoar, and/or surface facets. A layer of surface hoar buried in the upper snowpack is worth investigating before committing to any big alpine terrain. At the base of the snowpack, weak facets may be persisting.

Avalanche Problems

Wind Slabs

Wind slabs may be lurking on slopes lee to outflow winds. These can be triggered by a person, but have been reported to be mainly small.

Avoid steep slopes below cornices.>Be cautious as you transition into wind affected terrain.>

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Loose Wet

Sun may weaken the surface snow, causing loose wet avalanches in steep terrain.

Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet.>

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

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 3

Deep Persistent Slabs

This is a low probability problem with large consequences. A weak basal layer resulted in several full depth avalanches during the last sunny period which could be repeated this weekend. Avoid steep, sun exposed slopes during the afternoon.

Avoid steep unsupported planar slopes when the solar radiation is strong. >

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 3 - 6