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Archived

Avalanche Forecast

Nov 20th, 2012–Nov 21st, 2012
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Northwest Inland.

This bulletin is based on limited data. Local variations in conditions are likely to exist. Check out the forecaster's blog for further details on interpreting early season bulletins.

Confidence

3 - 139

Weather Forecast

Wednesday: Expect isolated flurries bringing up to 5cm before tapering off throughout the day, with light variable winds and freezing levels below valley bottoms. Thursday and Friday: An intense Pacific frontal system affecting the coast is expected to push inland with 10-15mm of precipitation by Friday afternoon, and associated strong to extreme southwesterly winds. Freezing levels are expected to spike to 1200m on Friday.

Avalanche Summary

A report from the Hankin-Evelyn area at the beginning of the month included a small human-triggered slab avalanche starting from a thin rock area. The slab was approximately 20cm deep and 8m and, ran full path with 70cm of deposition in the runout. More avalanche activity is expected during and immediately after stormy periods.

Snowpack Summary

A report from over two weeks ago suggested that the total snowpack depth was around 50cm at treeline and since then there has probably been around 20cm of new snowfall spread throughout the period. Expect any wind-exposed area to have highly variable snowpack depths, while below treeline is probably still below threshold depths for avalanches.