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Archived

Avalanche Forecast

Nov 28th, 2013–Nov 29th, 2013
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
Below Threshold
The avalanche danger rating below treeline will be below threshold
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
Below Threshold
The avalanche danger rating below treeline will be below threshold
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
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Purcells.

If you've been out recently and have observations, please drop us a line at [email protected].

Confidence

Poor - Due to the number of field observations

Weather Forecast

An approaching winter storm looks like it will hit this region on Sunday.Friday and Saturday: Flurries. Moderate westerly winds at ridgetop. Freezing level around 900 m.Sunday: 5 to 10 cm with low confidence. It's quite possible that twice this amount could fall. Expect strong SW ridgetop winds and freezing level around 500 m.

Avalanche Summary

No recent avalanche activity has been reported.

Snowpack Summary

Snowpack depths at treeline are approximately 70-100 cm. Alpine conditions are highly variable due to earlier redistribution of snow by strong winds. Probably the most important layer we've heard about in this region is a crust near the base of the snowpack that has sugary facets associated with it. In mid November, several large avalanches were reported on this weakness. A recent snowpack test in the backcountry near Kicking Horse on a NW aspect gave moderate but "sudden" results, indicating this layer is likely still trigerable. While this layer is probably slowly gaining strength, bear in mind facets take a long time and a lot of snowpack load to properly heal. The most likely place you'd trigger this layer is on smooth, planar, north facing slopes, especially if the snowpack is unusually shallow in that area.Recent temperature fluctuations, with little or no snow in the past week, mean you'll likely encounter a variety of snow surfaces, such as crusts, old wind slabs and shimmering surface hoar.

Avalanche Problems

Persistent Slabs

The most important layer is a crust with sugary facets that lies 5-40 cm off the ground. The most likely place to trigger it would be on a smooth, planar slope on a northerly aspect in a shallow snowpack area.
Be aware of the potential for large, deep avalanches due to the presence of buried crust/ facet combo.>If you are increasing your exposure to avalanche terrain, do it gradually as you gather information.>

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 5