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Archived

Avalanche Forecast

Dec 10th, 2013–Dec 11th, 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
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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Northwest Coastal.

The new storm has started and danger ratings are increasing.

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain on Wednesday

Weather Forecast

Overnight and Wednesday: A strong frontal system is expected to arrive overnight bringing moderate to heavy precipitation 30-40 cm. The freezing level jumps up to around 1000 m and winds are strong from the Southwest. Thursday:Continued moderate precipitation combined with moderate to strong Southwest winds. The freezing level remains close to 1000 m.Friday:There should be a bit of a lull between storms. Very little precipitation and moderate Westerly winds

Avalanche Summary

Avalanche activity is expected to increase through the week as snow accumulates and temperatures increase.

Snowpack Summary

Snowpack depths are highly variable across the region, with elevation, and in wind-exposed areas. Recent cold and clear weather has resulted in surface hoar formation and near-surface faceting, which is now getting buried by light dry snow. Low-elevation and wind-affected areas have a shallow faceted snowpack. While in higher elevation sheltered areas the previous storm snow is settling and gaining strength; however, weaknesses at the old snow interface down approximately 40cm may still exist. The lower snowpack is a series of crusts, some of which are laminated with facets, particularly in shallower areas.

Avalanche Problems

Storm Slabs

New storm snow and strong Northwest or Westerly winds should develop a touchy storm slab above recently faceted surface snow and wind crusts.
Minimize exposure during periods of heavy loading from new snow, wind.>Be cautious as you transition into wind affected terrain.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1 - 4