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Archived

Avalanche Forecast

Jan 4th, 2016–Jan 5th, 2016
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
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
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

Regions: Kootenay Boundary.

The recent snow fell on a widespread layer of surface hoar. Watch for reactive wind slabs in lee features.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

Were looking at a return to mainly benign weather through the forecast period. Skies will be overcast and there may be periods of isolated flurries although accumulations are not expected to be significant. Winds will be mainly light to moderate from the south on Tuesday and Wednesday becoming light from the southwest by Thursday. There is poor agreement in the models about how high the freezing level with get with the high resolution regional models calling for them to rise as high as 1400m.

Avalanche Summary

Avalanche activity has been limited to small loose snow avalanches running in the upper snowpack.

Snowpack Summary

Up to 15cm of new snow fell through the day on Monday covering a widespread layer of surface hoar.  This weak layer overlies a melt-freeze crust on solar aspects, old wind slabs in exposed higher elevation terrain and loose facets in sheltered areas .  About 50 cm below the surface, the mid-December interface can be found which consists of surface hoar and/or a sun crust.  The early December rain crust can be found about 20 cm below that, up to an elevation of 1400m. Both of these layers are thought to be gaining strength and are no longer reacting to snowpack tests except in isolated locations. The snowpack below these layers is generally strong and well-settled.

Avalanche Problems

Wind Slabs

The new snow is sitting on top of a layer of surface hoar.  Watch for signs of wind loading on north through north East aspects where wind slabs could be touchy.
Stay off recent wind loaded areas until the slope has had a chance to stabilize.>

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2