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Archived

Avalanche Forecast

Nov 17th, 2012–Nov 18th, 2012
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
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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

The Winter Permit System is NOT yet in effect but is scheduled to come into effect on Friday November 23. Click here for information on how to obtain annual and daily winter permits.

Weather Forecast

A frontal system arriving in the interior today expecting around 8mm of precipitation, rising freezing levels, light winds at treeline but strong SW winds in the alpine (50 to 80km/h). A second system follows in its wake on Sunday and into Monday.

Snowpack Summary

80cm to 110cm of snow in sheltered areas at tree line. The November crust is down 45cm. Wind slabs have been observed in the alpine and exposed areas at tree line over the past week.

Avalanche Summary

A size 2 loose natural avalanche observed in the highway corridor running 1/2 path on Mt Tupper.

Confidence

Forecast snowfall amounts are uncertain on Monday

Avalanche Problems

Wind Slabs

Light winds and very little snow have kept conditions the same. Soft windslabs still exist up to 50 cm deep formed during periods of strong wind on Nov 13 in open exposed areas. These have proven to be sensitive to human triggering.
Use ridges or ribs to avoid pockets of wind loaded snow.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3