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Archived

Avalanche Forecast

Dec 6th, 2011–Dec 7th, 2011
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Northwest Coastal.

Confidence

Fair - Timing of incoming weather is uncertain on Friday

Weather Forecast

Wednesday and Thursday: Mostly clear and dry, with freezing levels back to valley bottoms and moderate northwesterly winds. Friday: More snow is expected but the timing is uncertain. It could arrive as late as Friday evening. Freezing levels are expected to rise to 600m and winds shift to westerlies with the onset of precipitation.

Avalanche Summary

Numerous natural loose wet avalanches up to Size 2 with isolated Size 2.5s were observed during the warm and wet weather on Monday. Large glide avalanches from steep rock slabs were also observed; one was reported to be size 3.5.

Snowpack Summary

Overnight rain up to 1000m in the north, and alpine elevations in the south, likely melted surface hoar, settled surface facets, and froze into a crust. Glide cracks are opening and cornices are weakening.

Avalanche Problems

Cornices

Recent warm temperatures weakened cornices and rapid cooling may stress them even more. A hazard in themselves, but also a large trigger for wind slabs on the slope below.

Aspects: North, North East, East, South East.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3

Wind Slabs

Isolated weak wind slabs may still be lurking below ridge crests, behind terrain features, and in cross-loaded gullies.

Aspects: North, North East, East, South East, South, South West.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 2 - 4