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Archived

Avalanche Forecast

Nov 23rd, 2014–Nov 24th, 2014
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
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

The winter permit system is not yet in effect. Click here for more information.Wide range of conditions out there from shallow early season low down to more of a winter snowpack with buried weak layers higher up.

Weather Forecast

A couple of storm systems are approaching the interior. The first is expected to arrive around noon today and will bring light snow into this evening with light to moderate west winds. A second storm will bring heavier precipitation with rising freezing levels Tuesday into Wednesday.

Snowpack Summary

At tree line, 40cm of recent storm snow overlies the Nov 21 surface hoar layer. This layer formed as a sun crust on steep south aspects. The Nov 9 rain crust, 5-10cm thick, is down ~50-70cm and the Nov 3 crust is down ~70-80cm.

Avalanche Summary

7 natural size 2.0 avalanches were observed yesterday in the highway corridor east of the Rogers Pass summit out of the Mt McDonald gullies.

Confidence

Due to the number of field observations

Avalanche Problems

Storm Slabs

10cm has been added to the 30cm snow load and the moderate to strong winds we received yesterday. Expect some slabby snow as you climb higher in open areas. Remember that this new snow sits over surface hoar and on steep south a sun crust.
Be cautious as you transition into wind affected terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2