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Archived

Avalanche Forecast

Apr 27th, 2013–Apr 28th, 2013
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
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
2: Moderate
The avalanche danger rating in the alpine will be moderate
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.

Sunday will see little overnight freeze and continued strong winds.  Watch for touchy wind slabs and sluffing in bigger alpine terrain. SH

Weather Forecast

Continued strong westerly winds Sunday with slightly cooler temperatures (freezing levels 1500m overnight) and light flurries or showers West of the divide at lower elevations. Expect little freeze again below treeline. Sunday evening through to Monday expect 10-15cm of snow along the divide with freezing levels dropping throughout the day.

Snowpack Summary

Rain below 1900m with no freeze overnight.  Strong to extreme SW winds (up to 133kmh on Mt. Bosworth) in the alpine have created pockets of wind slab on lee features.

Avalanche Summary

Limited observations Saturday due to poor visibility but no new  avalanches reported

Confidence

on Sunday

Avalanche Problems

Wind Slabs

Fresh wind slabs have likely formed in lee features .  These new wind slabs will be sitting over previous wind slabs which can still be triggered in steeper terrain, especially where they overly a crust.
Be careful with wind loaded pockets

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Loose Dry

Watch for heavy sloughing where powder overlies harder bed surfaces. In steep terrain, this could push you over a cliff or into a terrain trap.
Be cautious of sluffing in steep terrain.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2

Loose Wet

Rain below treeline and no overnight freeze means wet avalanches are possible.  Steep, gullied terrain that still has enough snow to slide will be the features of most concern.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2