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Archived

Avalanche Forecast

Nov 28th, 2011–Nov 29th, 2011
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
4: High
The avalanche danger rating in the alpine will be high
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: Northwest Coastal.

Confidence

Fair - Due to limited field observations

Weather Forecast

25 cm to 70 cm expected from 4pm Mon - 4pm Tue.

Avalanche Summary

Control work in the North on Bear Pass on Sunday produced numerous dry loose snow avalanches size 1 -2, 15-30 cm in depth on SW - S aspects. One Xh size 2.5: 50 w x 1200 L x 100-150cm depth. To the South, Shames reported a Na SL sz 3.0, E @1300 m. 250 w x 1700 long. Failing on Nov11-19 SH. Other control work produced results very similar to that in the North.

Snowpack Summary

Saturdays system dumped another 50-75cm in many areas. Sunday brought another 25 - 35cm to upper elevations. The snowpack depth near treeline is already around 300cm. Fluctuating freezing levels and varying precipitation intensity and wind throughout the recent storms has probably resulted in various weaknesses within upper snowpack. A buried surface hoar layer may be found down close to 100/150cm, but there is no recent information on the presence and sensitivity of this layer. The mid and lower snowpack is generally well settled/strong with an old rain crust near the ground.

Avalanche Problems

Wind Slabs

New snow combined with strong winds have created dense wind slabs at and well below ridge top. Additional wind and snow will further exacerbate this problem.

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

Elevations: Alpine, Treeline.

Likelihood: Likely - Very Likely

Expected Size: 2 - 5

Storm Slabs

Weaknesses may exist within storm snow; 25 - 150 cm in depth.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1 - 5