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Archived

Avalanche Forecast

Mar 16th, 2013–Mar 17th, 2013
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
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
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: Kootenay Boundary.

Confidence

Fair - Forecast snowfall amounts are uncertain on Sunday

Weather Forecast

Saturday night: Light snow. Light W winds. Freezing level at the surface.Sunday: Light snow. Light NW winds with gusty N winds. Alpine temperature near -7.Monday: Light snow. Light W winds, gusting to strong NW winds. Alpine temperature near -5.Tuesday: Light snow. Light S winds. Alpine temperature near -8.

Avalanche Summary

A widespread avalanche cycle was observed during the storm, which was particularly active as temperatures warmed up. Most avalanches were in the size 1-2 range and failed within, or at the base of, the storm snow. They were observed on all aspects and at most elevations.

Snowpack Summary

A series of warming events (sun and rain) and subsequent cooling has left a variety of crusts in the upper snowpack. Recent rain soaked the snowpack at low elevations, and moistened surface layers at upper elevations. A layer of surface hoar and/or a crust is buried about 40 cm deep. Wind slabs and cornices exist near ridge tops. Deeper in the snowpack, a weak interface buried in mid-February is still on the radar. Although unlikely to be triggered, it remains possible with a very heavy load or from a thin-spot trigger point, particularly in locations where the snowpack above this layer is free of supportive crusts.Until temperatures remain cool for an extended period of time, I’d maintain some degree of suspicion about the overall strength of the snowpack.

Avalanche Problems

Storm Slabs

Forecast snow and wind will add to existing storm slab problems at high elevations and may bond poorly to a crust at lower elevations. Give the snowpack time to find its equilibrium before considering aggressive terrain.
Stay off recent wind loaded areas until the slope has had a chance to stabilize.>Be alert to conditions that change with elevation.>Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar in isolated locations.>Be cautious of sluffing in steep terrain.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 5