Avalanche Forecast

Issued: Dec 15th, 2013 8:32AM

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

Avalanche Canada bcorrigan, Avalanche Canada

Summary

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

Monday: A brief lull in weather systems will see trace to light snowfall for the region. Cool temperatures and strong winds from the Southwest.Tuesday: Another storm makes landfall on the northwest coast, the inland northwest could see 10 to 20 cm of new snow at upper elevations with strong southwest winds at ridge top.Wednesday: Cool arctic air moves into the region bringing freezing levels down to valley bottoms.

Avalanche Summary

No new avalanches have been reported. This likely speaks more to the lack of observations than actual conditions. Strong winds, new snow, and warm temperatures are expected to increase the sensitivity to triggering by skiers and sledders.

Snowpack Summary

Reports from the area are quite sparse. Expect significant variation in snow depths across the region with areas in the Southwest (Howson range) likely to be more like the Northwest Coastal region. Around Smithers, reports suggest snow depths of 70-90cm at treeline.The northern portion of the region received more snow (upwards of 20cm) than the south (Smithers area) which received 10 to 20 cm overnight. In areas that received significant new snow amounts, the snow is settling into a storm slab, accelerated by the recent warm temperatures. Very strong winds are transporting snow into deep pockets of cohesive, wind pressed snow. Cold temperatures at the beginning of December created near surface facetted snow and surface hoar above old wind and melt-freeze crusts. The new warmer storm snow is not expected to bond well to these old buried layers which range from 20-40cm below the surface. The mid and lower snowpack is fundamentally weak, composed of facets, depth hoar and an early season crust near the base of the snowpack.If you have been out, we would love to hear about it. Please send your observations to forecaster@avalanche.ca.

Problems

Storm Slabs

An icon showing Storm Slabs
Recent snowfall accompanied by high winds has created winds slabs on lee slopes. It will take time for these slabs to bond to the existing snowpack. The areas of major concern are at tree line and above.
Minimize exposure during periods of heavy loading from new snow, wind.>Be cautious as you transition into wind affected terrain.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible - Likely

Expected Size

2 - 3

Valid until: Dec 16th, 2013 2:00PM

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