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Archived

Avalanche Forecast

Dec 2nd, 2019–Dec 3rd, 2019
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
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.

Expect a gradual increase in the avalanche hazard at upper elevations this week.

Weather Forecast

Temperatures will continue to warm Tuesday, Wednesday as day time highs at valley bottom will be above 0 celsius. We can expect overcast sky's and light precipitation starting Tuesday with the bulk of accumulation Wednesday, forecasted snow amounts of up to 20cm. As this systems approaches winds at ridge crest will be strong.

Snowpack Summary

Snow surface conditions range from hard slabs to re-crystalized soft snow with little wind effect. The Nov 8 crust is down 20-30cm up to 2400m which is facetting over time. The lower snowpack is a mix of weak facets & crusts. Snowpack depths at treeline vary from 60-90 cm with up to 140 cm in lee areas.

Avalanche Summary

Reports of newly formed wind slabs isolated to ridge crest have been reactive to explosive control and ski cuts. All observed avalanches were no greater then size one.

Confidence

Avalanche Problems

Wind Slabs

A combination of warm temperatures, increased winds and light precipitation has brought the wind slab problem back. Wind slab development will likely be limited to the alpine in lee areas.

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2