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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
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
1: Low
The avalanche danger rating below treeline will be low
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

Regions: Banff Yoho Kootenay.

We are on a slow healing trend after the big storm earlier in the week.  It will take a few days for the new snow to bond to the surfaces below.  SH

Weather Forecast

Lowering freezing levels to valley bottom, light to moderate SW winds and only light precipitation with cloudy conditions in the forecast for Sunday.  A continued cooling trend is forecast over the next few days with clearing skies on Tuesday.

Snowpack Summary

40-60cm of recent storm snow is settling out as the temperatures start to cool down.  Moist snow below 1700m.  East of the divide there is a mainly faceted snowpack beneath the recent snow.  Thicker snowpack areas are found mainly West of the divide and have a well settled snowpack beneath the recent storm slabs.

Avalanche Summary

Explosive control at sunshine village produced 2 size 3's releasing on basal facets 1m deep and several size 2's confined to the recent storm snow.  These were 40-60cm deep.  One natural cornice release on Mt. Bosworth caused a size 3 within the storm snow within the last 24 hours. 

Confidence

on Sunday

Avalanche Problems

Storm Slabs

Storm slabs 40-60cm thick are widespread at upper elevations.  Natural activity has tapered off, but these are still sensitive to human triggering.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Loose Wet

Cooler temperatures will start to take some moisture out of the snow for Sunday, but will take a couple of clear nights to freeze.  Thin, steep, gullied terrain will be the most susceptible to triggering.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2