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Archived

Avalanche Forecast

Nov 19th, 2012–Nov 20th, 2012
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
1: Low
The avalanche danger rating below treeline will be low
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
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

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

Southwesterly flow will continue to bring precipitation to the interior through Wednesday. Up to 35mm is possible. Freezing levels will be near 1500m and strong SW wind is forecast.

Snowpack Summary

10 of new snow. November crust layers are buried about 60 to 70 cm in sheltered areas. Extreme southerly winds early Sunday produced windslabs on northerly aspects in the alpine and treeline.

Avalanche Summary

Several natural avalanches were observed yesterday. These occurred in steep north facing alpine terrain and ran to about one-half fan.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

Avalanche Problems

Wind Slabs

Moderate to strong S-SW winds on Sunday  and 20 cm of storm snow has created new windslab in open exposed areas. Conditions have become more touchy up high and large avalanches have been observed recently.
Be cautious as you transition into wind affected terrain.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Storm Slabs

Expect a storm slab to develop as heavy precipitation, strong wind and mild temperatures are forecast Monday night and Tuesday.
Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3