Avalanche Forecast

Issued: Dec 29th, 2015 8:04AM

The alpine rating is moderate, the treeline rating is low, and the below treeline rating is low. Known problems include Wind Slabs.

Avalanche Canada jlammers, Avalanche Canada

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Summary

Confidence

Low - Due to the number of field observations

Weather Forecast

The current ridge of high pressure will deliver clear skies for Wednesday and Thursday while increased cloud is expected on Friday. An inversion will develop over the forecast period with above-freezing alpine temperatures expected by late Thursday and Friday. Ridgetop winds should be light and northeasterly on Wednesday increasing to strong and southwesterly on Thursday and Friday

Avalanche Summary

No recent avalanches have been reported. With solar radiation and slight warming forecast for the next few days, loose wet avalanches will become more likely on steep, sun-exposed slopes.

Snowpack Summary

Light amounts (10-15cm) of snow fell last weekend. Variable winds have likely shifted the new snow into wind slabs in upper elevation lee terrain. Although these wind slabs have likely gained strength, I'd remain cautious on steep, unsupported slopes in the immediate lee of ridge crests. We're still dealing with a thin, early-season snowpack for much of the Northwest Inland region. Between 80 and 100 cm of snow can be found at tree-line in the south and west of the region, with closer to 60 cm in the east. A weak basal layer probably exists in most areas, and I suspect that the ongoing cold temperatures have continued to promote faceting in the snowpack, especially in shallow, rocky areas.

Problems

Wind Slabs

An icon showing Wind Slabs
I'd remain suspicious of wind slabs in upper elevation lee terrain. Use extra caution in the lee of ridge crests and in gullies. Forecast solar radiation and warming may also increase the likelihood of loose wet avalanches on sun-exposed slopes.
Be alert to conditions that change with elevation.>Be cautious as you transition into wind affected terrain.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Dec 30th, 2015 2:00PM