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Archived

Avalanche Forecast

Dec 12th, 2019–Dec 13th, 2019
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
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: Kootenay Boundary.

Fresh storm slabs may be reactive to human triggering, especially in wind loaded areas.

Confidence

Moderate - Uncertainty is due to the limited number of field observations.

Weather Forecast

THURSDAY NIGHT - Flurries, 5 cm / southwest winds, 20-40 km/h / alpine low temperature near -5

FRIDAY - Mainly cloudy with isolated flurries / west winds 20-30 km/h / alpine high temperature near -6

SATURDAY - Cloudy with sunny periods and isolated flurries / light northwest winds / alpine high temperature near -7

SUNDAY - A mix of sun and cloud / light northwest winds / alpine high temperature near -10

Avalanche Summary

There were a few human and explosives triggered avalanches size 1-2 reported on Thursday. Check out this MIN report of an avalanche in the Big White Backcountry on Thursday.

Snowpack Summary

10-20 cm of new snow sits on a weak layer of feathery surface hoar in many areas, and on a crust on steep south facing slopes. Recent strong winds have likely formed storm slabs that may be reactive to human triggers. There is a weak layer down approximately 50-60 cm that consists of a crust with sugary faceted snow on top of it. Recent test results indicate that this layer could react to human triggers.

Avalanche Problems

Storm Slabs

With up to 15 cm of fresh snow sitting on a weak layer of surface hoar in many areas, be aware of the potential for human triggered storm slab avalanches. These avalanches could potentially step down to another weak layer that is down about 50-60 cm, resulting in larger avalanches than expected.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2