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Archived

Avalanche Forecast

Jan 5th, 2013–Jan 6th, 2013
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
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
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.

Weather Forecast

Mod NW alpine winds Sunday with a few cm possible West of the divide, but dry in the Eastern regions. Forecasts are currently calling for increasing winds Monday night/Tuesday into the strong - extreme range and light amounts of snow.  This may increase the overall hazard.

Snowpack Summary

Field trips in Kootenay and Hwy93 N. found surface hoar to 1cm up to treeline as well as surface facetting.  Some hard wind slabs in alpine areas are mainly unreactive.  Mid pack maintaining strength in deeper snow pack areas, but thin areas are mainly faceted, including the basal Nov 6 crust.

Avalanche Summary

A few small loose snow avalanches triggered by skiers in very steep terrain at treeline in the Kootenay region.  Some small loose snow avalanches also noted from steep features in the alpine on solar aspects from the last 24 hrs. All were maximum sz. 1

Confidence

on Sunday

Avalanche Problems

Loose Dry

Watch for sloughing in very steep, shallow terrain where the snow has lost all cohesion due to facetting.
Watch for terrain traps where small amounts of snow will acumulate into deep deposits.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2

Wind Slabs

Variable wind slabs have been mainly unreactive in the past few days, but are still areas to avoid in steep alpine features. 
Watch for areas of hard wind slab in steep alpine features.

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

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2