Avalanche Forecast

Issued: Feb 7th, 2012 9:11AM

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

Avalanche Canada jlammers, Avalanche Canada

Summary

Confidence

Fair - Forecast snowfall amounts are uncertain

Weather Forecast

On Wednesday expect increased cloud throughout the region. Weather models are disagreeing on snowfall amounts for Thursday/Friday. Some are claiming 5-10cm for each day, while others are looking a lot drier. Stay tuned for more info. Winds are expected to be light to moderate from the northwest trending to light and variable by Friday. Freezing levels are expected to be at about 1100m on Wednesday trending to about 1400m for Thursday/Friday.

Avalanche Summary

A few newly developed windslabs to size 1.5 were observed in the alpine on Monday.

Snowpack Summary

January was a snowy month in the South Columbia region and average snowpack depths at 1700m are now between 2 and 3m. The upper snowpack is now well settled and riders have gained increased confidence on steeper terrain. The one exception may be new wind slabs that formed with moderate alpine winds on Monday/Tuesday. Deeper weaknesses in the snowpack seem to less of a concern; however, in the southern end of the region there is still talk of basal facets as some operators are avoiding thin and rocky alpine features. Over the weekend there was s spike in alpine temperatures that sparked a significant avalanche cycle. With the more recent cooling pattern there has been a crust recovery on previously sun-exposed slopes, and there has been a general significant strengthening of the snowpack. If you're heading into the mountains, it's a good time to take stock of evolving layers (crusts, surface hoar) that may be an issue when it finally snows again.

Problems

Wind Slabs

An icon showing Wind Slabs
Recent winds have set up fresh wind slabs on lee features in the alpine.

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

Elevations: Alpine.

Likelihood

Possible - Likely

Expected Size

1 - 3

Cornices

An icon showing Cornices
Large and unsupported cornices exist in the alpine. Failing cornices are destructive by themselves and have the potential to trigger avalanches on the slope below.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood

Possible

Expected Size

3 - 6

Valid until: Feb 8th, 2012 3:00AM

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