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Archived

Avalanche Forecast

Mar 2nd, 2013–Mar 3rd, 2013
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
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
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Banff Yoho Kootenay.

Additional load with a cold NE storm Sunday  will keep the danger HIGH. Cold temperatures after the storm should tighten up the lower elevation instabilities.  Avalanche Control on Sunshine Road and Mt. Whymper tomorrow! JBW

Weather Forecast

A cold upper trough will cut off the strong southwesterly sub tropical flow creating a winter north east storm overnight and into Sunday. The skies will clear and the temperatures drop in the wake of the  cold front.

Snowpack Summary

Up to 50 cm of storm snow has created a new snow slab which is failing easily on the old snow surfaces in the alpine. At treeline and below, rising freezing levels and rain have created a moist to wet slab condition.

Avalanche Summary

Natural avalanches are running on all aspects and elevations up to size 3.5. Storm slabs from the upper start zones are pulling out additional moist slabs and wet avalanches in the lower tracks. Steep slopes in the valley bottoms are failing as wet loose avalanches.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Storm Slabs

Another 20 cm overnight with strong winds will add to the avalanche danger. Avoid travel in avalanche terrain until the snow stabilizes with the cold front passage.
Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.Avoid all avalanche terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely - Very Likely

Expected Size: 2 - 4

Loose Wet

Below treeline and down into the valley bottoms the snow is moist and unstable. Loos wet avalanches and moist slabs are possible on all steep terrain
Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.Stick to simple terrain and be aware of what is above you at all times.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 2