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Archived

Avalanche Forecast

Dec 17th, 2014–Dec 18th, 2014
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
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
1: Low
The avalanche danger rating at treeline will be low
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
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

If you are walking around today notice the large surface hoar that has been growing, and remember it on the weekend when they will become a real concern if the forecast snow arrives.

Weather Forecast

Today we should see increasing cloud with isolated flurries, light SW winds at ridge top, and an alpine high of -4'C. Thurs and Friday will be mostly cloudy with flurries, light but gusty SW winds and alpine highs of -1. The new snow will bury and preserve big surface hoar that will be an issue when the real snow comes over the weekend.

Snowpack Summary

New surface hoar, up to 2cm in size, is growing on a rain crust to 2100m and on settling snow above 2100m. Pockets of surface hoar that was buried in early Dec is down ~40cm, is spotty in distribution, but may be triggerable if present.  Well settled mid-pack with 30cm crust/facet basal weakness (Nov 9) observed in certain locations.

Avalanche Summary

No new avalanches have been observed since Dec 12th.

Confidence

Avalanche Problems

Persistent Slabs

The November crust weaknesses at the bottom of the snowpack are difficult to trigger, but if they fail the consequences will be very high.
Avoid shallow snowpack areas where triggering is more likely.Be wary of slopes that did not previously avalanche.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 2 - 3