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Avalanche Forecast

Archived

Dec 15th, 2013–Dec 16th, 2013

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

Regions

Cariboos.

Confidence

Fair - Intensity of incoming weather systems is uncertain

Weather Forecast

Monday: Strong westerly flow will prevail over the North Columbia's and Cariboo's  as another Wave of moist Pacific air will move into the interior bringing locally moderate to heavy precipitation and high winds.  Freezing levels will rise during the storm then drop to near valley bottoms.Tuesday: The moist Pacific air will move farther east and south late Tuesday with light precipitation as it leaves the area.  Freezing levels should remain at or close to valley bottoms.Wednesday:  As the Pacific front  moves out of the area , cold arctic air will move in from the north.

Avalanche Summary

No new avalanches reported. The lack of observations likely speaks more to the lack of observations rather than actual conditions. With forecast snowfall, winds and warm temperatures, a spike in avalanche activity is likely through the weekend and into the beginning of next week.

Snowpack Summary

Snowpack levels vary across the region. Moderate to heavy snow fall on top of the recent light snow will continue to add load to buried weak layers. The upper snowpack contains wind slabs, crusts, surface hoar, and facets. Rising temperatures forecast over the next few days will consolidate the storm slab above these weak layers. It's difficult to determine when the slab will become more sensitive to light triggers like skiers and sledders. These weak layers are expected to be persistent, although in many areas the upper slab is not yet stiff enough for slab avalanches. When temperatures rise, and with additional snow, expect these layers to become more reactive.Digging deeper, into the mid-pack, a couple of persistent weak layers (surface hoar and facets) can be found that formed in mid and late November. Near the base of the snowpack, an early season rain crust exists. The continuous loading of new snow and the rising temperatures may be enough to wake up these previously dormant layers.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.