Avalog
Register
Get forecast notifications
Create an account to receive email notifications when forecasts are published.
Register
Login
Archived

Avalanche Forecast

Nov 22nd, 2012–Nov 23rd, 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
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
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: Glacier.

The winter permit system is not yet in effect but is scheduled to come into effect on Friday, November 23rd.  Click here for more information on how to obtain annual and daily winter permits.

Weather Forecast

Ridge of high pressure over the park will produce some clearing today. The ridge will break down later today as a warm front associated with a developing low pressure system moves over the area producing cloud and precipitation overnight and tomorrow

Snowpack Summary

Now over 90mm of load on the Nov 6 crust, down 60-100cm.  Whumphing, sudden collapse and sudden planar results have been reported on this layer recently. A cohesive storm slab has formed and appears to be reactive where it overlies the Nov 16 sun crust.

Avalanche Summary

2 size 2 natural observed above the highway corridor on the west side of the pass yesterday, limited visibility. 

Confidence

Timing or intensity of solar radiation is uncertain

Avalanche Problems

Wind Slabs

Moderate to strong S-SW winds  redistributied recent storm snow yesterday afternoon and overnight, forming windslabs on  lee slopes. 
Assess start zones carefully and use safe travel techniques.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Persistent Slabs

Reports continue of whumphs, sudden collapse and sudden planar results on this layer.  Incoming solar radiation during clear periods may change slab properties rapidly today. 
Assess start zones carefully and use safe travel techniques.Make observations and assess conditions continually as you travel.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3