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Archived

Avalanche Forecast

Dec 1st, 2013–Dec 2nd, 2013
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
3: Considerable
The avalanche danger rating below treeline will be considerable
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
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Conditions have changed from last week. Its time to be more conservative in your decision making.

Weather Forecast

Pacific system bringing snow to the interior into tomorrow. Forecast amounts are variable from light to moderate today to light amounts tomorrow. A high pressure ridge is building. It will clear the skies and cool the temperatures for Tuesday.

Snowpack Summary

20cm of new snow is over the November 28 surface hoar layer which had widespread distribution. This surface hoar layer is sitting on sun crust on steep south aspects or facets elsewhere. The November 12 surface hoar layer is down 50 to 110 cm from tree line to the alpine.

Avalanche Summary

No new avalanches observed yesterday.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Storm Slabs

More snow is expected today increasing the avalanche hazard. A new surface hoar layer is down around 20cm under this new snow. It has widespread distribution and will be easily triggered by riders under this new load.
Minimize exposure during periods of heavy loading from new snow, wind.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

A surface hoar layer buried down 50-110cm at the higher elevations is within the range of rider triggering.
Dig down to find and test weak layers before committing to a line.Be aware of thin areas that may propogate to deeper instabilites.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3