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Archived

Avalanche Forecast

Nov 28th, 2015–Nov 29th, 2015
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: Kootenay Boundary.

Warming forecast for the next few days will increase the Avalanche Danger, especially at higher elevations.Special thanks to the folks in Nelson and Kootenay Pass for their awesome MIN reports. You rock!

Weather Forecast

A dry ridge of high pressure will continue to bring clear skies and valley fog to the region for the forecast period. The strong inversion will continue until Monday with alpine temperature hovering at around 5' celcius while valley temperatures will remain well below freezing. Ridgetop winds should remain light to moderate from the northeast.

Avalanche Summary

No new avalanches have been reported. This may speak to the lack of observations rather than actual conditions. Given the combination of solar radiation and warm temperatures at higher elevations, there has likely been a round of loose wet avalanche activity on steep, sun-exposed slopes.

Snowpack Summary

At treeline elevations, the snowpack appears to typically be 1-1.5m deep. Current snow surfaces likely include a mix of stubborn wind slabs in exposed higher elevation terrain, loose faceted snow and surface hoar in sheltered areas, and (depending on the time of day) moist snow or a re-frozen crust on steep solar aspects. In some parts of the region a thick hard crust is reported to exist just below the surface. For the time being, this hard crust is likely adding significant strength to the snowpack. That said, the combination of facets and surface hoar overlying a hard crust could become a reactive weak layer if it ever gets buried by new snow. There is also a thick crust from early-November in the middle of the snowpack. The limited reports we have received suggest that this crust is well bonded but you should investigate the snowpack in your local area before committing yourself to avalanche terrain. In general, there is a lot of uncertainty regarding snowpack structure throughout the region. If you have any observations to share, please submit them to our Mountain Information Network.

Avalanche Problems

Loose Wet

Unseasonably warm temperatures and sun will increase the chances of loose wet avalanche activity on steep, sun-exposed slopes in the alpine and at treeline. Watch for conditions that change with aspect, elevation and time of day.
Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.>Watch for clues, like sluffing off of cliffs, that the snowpack is warming up. >

Aspects: North.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Wind Slabs

Continued warm temperatures should help decrease the reactivity of recently formed wind slabs. Watch for triggering in steep, unsupported terrain, especially in spots where a hard underlying crust exists.
Be cautious as you transition into wind affected terrain. >If you are increasing your exposure to avalanche terrain, do it gradually as you gather information. >

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

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2