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Avalanche Forecast

Archived

Dec 16th, 2013–Dec 17th, 2013

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Northwest Inland.

Forecasters are working with little field observation data at this time. If you have been out in the mountains, please send us you information and observations. Send to:[email protected]

Confidence

Fair - Intensity of incoming weather systems is uncertain

Weather Forecast

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.Thursday:  Cold arctic air remains in the region as the arctic front moves south.

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

There is wide variation in snow depths across the region. Areas in the Southwest (Howson range) are likely similar to the Northwest Coastal region. Around Smithers, reports suggest snow depths of 70-90cm at treeline.The northern portion of the region received a bit 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 have transported snow into layes of cohesive, wind pressed snow. Cold temperatures at the beginning of December created 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, and is 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 [email protected].

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.