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Archived

Avalanche Forecast

Jan 9th, 2013–Jan 10th, 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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Banff Yoho Kootenay.

Avalanche control planned for Banff, Yoho and Kootenay National Parks. Please no skiing/climbing on Mt. Bourgeau, Mt. Whymper, Mt. Stephen and Mt. Dennis on Thursday.

Weather Forecast

Another 5-10 cm forecasted for Wednesday night. Precipitation expected to ease off by noon on Thursday with a cooling trend for Thursday afternoon. Clear and cool temperatures forecast for Friday and the weekend

Snowpack Summary

30-50 cm new snow in past 24 hrs at treeline and up to 80 cm in past 72 hours. Mod SW winds  producing storm slabs that are sitting on a weak facet layer. Widespread natural cycle in storm snow observed today

Avalanche Summary

Numerous natural avalanches up to Class 3 running to top of run-out zones observed today. Explosive control on Sunshine Road produced one Class 3 avalanche that buried road 80 cm deep by 15 metres wide

Confidence

Due to the number and quality of field observations

Avalanche Problems

Storm Slabs

30-50 cm at treeline in past 24 hours and up to 80 cm in past 72 hours. Moderate SW winds producing storm slabs that are sitting on a weak facet layer. Widespread natural cycle in storm snow observed on Wednesday.
Travel in avalanche terrain is not recommended with current conditions.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Very Likely

Expected Size: 2 - 3