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Archived

Avalanche Forecast

Apr 9th, 2017–Apr 10th, 2017
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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Banff Yoho Kootenay.

Solar radiation will have an impact on South East through West aspects tomorrow at treeline and below.

Weather Forecast

A clearing trend starting tomorrow will enter the forecast region. Temperatures however, will remain cool-ish hovering around -12 near 3000m. The wind may pickup to the moderate range from the west for a short period of time. The freezing level is not expected to rise much above surface tomorrow.

Snowpack Summary

Variable amounts of storm snow (10-30cm) has fallen through-out the region in the last 48 hours.  Lower than anticipated temperatures kept the surface snow cool at treeline and up.  Lower elevation snowpack is in a melt freeze cycle, recovering overnight and deteriorating through the day. A thick slab overlies facets in much of the region.

Avalanche Summary

No slab avalanches were observed or reported today.

Confidence

Timing or intensity of solar radiation is uncertain on Tuesday

Avalanche Problems

Deep Persistent Slabs

The snowpack is generally unstable, despite the strong feel of the surface layers. This layer remains reactive in snowpack test and can produced large avalanches. Patience is a virtue with this kind of problem.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Unlikely - Possible

Expected Size: 2 - 4

Cornices

April is cornice season, and we are getting regular reports of cornices failing and triggering deep slabs. Mature cornices can propagate much further than you expect, so give them a wide margin when traveling on ridges.
Avoid steep slopes below cornices.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3

Loose Wet

Sunny skies tomorrow may induce a solar cycle on South-East through West aspects at treeline and below.
Use extra caution on solar slopes, or if the snow is moist or wet.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2