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Archived

Avalanche Forecast

Mar 4th, 2012–Mar 5th, 2012
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.

A natural avalanche cycle to size 3 is occurring, and the spike of this system will happen early tomorrow. We may dip into extreme during this time. 48hr. snowfall amounts so far 30cm to 70cm, and rain in Field and Kootenay, 30 cm more possible.SH

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

on Monday

Avalanche Problems

Persistent Slabs

Snow depths over the Valentines surface hoar and sun crust on steep solar aspects range from 40cm E of the Divide, to 90+cm at Sunshine and Yoho. Continuing warm, dense snowfall and strong winds will increase natural activity on this layer.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 2 - 3

Wind Slabs

Fresh and buried wind slabs up to 60cm thick are primed for triggering. They have been seen to step down onto the Valentines surface hoar layer to cause larger avalanches.

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

Elevations: Alpine, Treeline.

Likelihood: Likely - Very Likely

Expected Size: 1 - 3

Deep Persistent Slabs

Recent trips east of the Divide have found a shallow, weak snowpack. Tests done showed sudden collapse results on the basal facets. It is still possible to trigger the entire slope from shallow, thinly covered areas.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2