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Archived

Avalanche Forecast

Dec 30th, 2019–Dec 31st, 2019
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
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
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.

Watch for fresh pockets of windslab today if/when the winds pick up.

Weather Forecast

A system making landfall over the mid coast will push a series of warm fronts inland over the next couple of days. Winds will increase through out the day today, with snowfall beginning late this afternoon.

Snowpack Summary

10cm of settling snow sits on top of surface hoar and a thin crust on steep S aspects. Recent cold temps have facetted the upper snowpack, but have not penetrated into the stiff snow that overlies the Dec 11th surface hoar (5-12mm) which persists down 90-130cm. Several crusts exist in the rounding lower snowpack.

Avalanche Summary

A few small loose snow avalanches were triggered by the sun yesterday.

Confidence

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

Avalanche Problems

Wind Slabs

The windslabs formed last week have not been reactive to skier traffic recently, but increasing winds this afternoon may build fresh windslabs. 

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 1.5

Persistent Slabs

The surface hoar layer down a meter is well preserved in some areas and human triggering remains possible. Due to the depth of this layer the resulting avalanche would be large.

  • Use caution on open slopes and convex rolls where buried surface hoar may be preserved.
  • Be wary of slopes that did not previously avalanche.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Unlikely

Expected Size: 2 - 3.5