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Archived

Avalanche Forecast

Apr 4th, 2013–Apr 5th, 2013
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Kootenay Boundary.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

A moist Pacific frontal system will bring moderate to heavy rain to the region overnight Thursday, continuing light to moderate through Friday. Freezing levels will gradually fall to 1600m on Saturday as precipitation tapers off with up to 6 cm of snow at upper elevations.

Avalanche Summary

One report of a sz 2.5 cornice initiated avalanche which triggered a slab to ground on the fan.

Snowpack Summary

The upper snowpack is now moist on all aspects as high as 2300m in elevation with reports of isothermal conditions as high as 2000m. The surface on north aspects is now moist due to warm overnight temperatures the past two nights.

Avalanche Problems

Loose Wet

Small wet point releases may entrain significant mass and run a long way.
Watch for terrain traps where small amounts of snow will accumulate into deep deposits.>Avoid all avalanche terrain during periods of heavy loading from rain.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 5

Cornices

Large cornices at upper elevations will be de-stabilized by high freezing levels and incoming rain. Cornice falls may trigger large wet loose avalanches and potentially trigger slabs from upper north facing start zones.
Pay attention to overhead hazards like cornices and steep upper start zones.>

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 5