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Avalanche Forecast

Nov 27th, 2020–Nov 28th, 2020
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
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: North Rockies.

A significant storm has brought up to 70 cm new snow to this region, particularly to southern areas such as Torpy, Renshaw and Kakwa. Avoid avalanche terrain during and immediately after the storm. 

Confidence

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

Weather Forecast

FRIDAY NIGHT: Southern areas 25 cm, northern areas 10-15 cm new snow. Moderate northwest winds. Cooling trend.

SATURDAY: Dry and clearing towards noon. Moderate northwesterly winds becoming westerly in the afternoon. Treeline temperatures around -9C.

SUNDAY: Windy, with strong southwesterly winds at ridgetop. Dry. Freezing level rising to around 1400 m.

MONDAY: 5-10 cm new snow. Strong southwesterly winds. Freezing level around 1500 m. 

Avalanche Summary

I strongly suspect there will be evidence of natural avalanches from Friday's storm.

Snowpack Summary

Snow depths are approximately 150 cm in the north west of the region (Pine Pass), 180 cm in the south (Renshaw, Kakwa) and 100 cm in the the north east (Tumbler ridge).

In the deeper areas, successive storms have resulted in deep powder in the upper snowpack. Expect to sink in far if you step off your machine. In windy areas, this snow will almost certainly have been blown into denser wind deposits.

Most likely the most significant instabilities are within or at the base of the most recent storm snow, approximately 50 cm below the snow surface.

Crusts have been reported towards the base of the snowpack. These are of most concern on steep terrain in thinner snowpack areas.

Terrain and Travel

  • Stick to simple terrain and be aware of what is above you at all times.

Avalanche Problems

Storm Slabs

30-70 cm recent storm snow has fallen in this region with the highest amounts in the south.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 1.5 - 3