Avalanche Forecast

Issued: Dec 23rd, 2014 8:30AM

The alpine rating is high, the treeline rating is high, and the below treeline rating is considerable. Known problems include Storm Slabs and Deep Persistent Slabs.

Avalanche Canada swerner, Avalanche Canada

Avalanche hazard is high. As it decreases over the next few days, conditions will remain very tricky.

Summary

Confidence

Fair - Forecast snowfall amounts are uncertain

Weather Forecast

A Pacific frontal system reaches the Interior Tuesday afternoon bringing snow overnight into midday Wednesday. Snow amounts will accumulate anywhere from 10-25 cm with lesser amounts in Northern locations. This will be accompanied by moderate west ridgetop winds, switching NW by the afternoon. Treeline freezing levels will hover around 1000 m. By Thursday an upper ridge will build behind the cold front bringing cooler conditions with mostly cloudy skies and light snow amounts. Friday will see a mix of sun and cloud with flurries and freezing levels at valley bottom.

Avalanche Summary

On Monday, numerous natural and skier triggered avalanches were reported from size 1-2.5 and failing on the buried surface hoar layer 30-60 cm down. In adjacent regions remotely triggered avalanches occurred from distances up to 40 m away, which may exist in certain locations where the surface hoar is more predominant in the Purcells. New snow and wind will add load to the upper snowpack and natural avalanche activity is expected. Best case scenario is the new storm snow will initiate a widespread natural avalanche cycle, however; if it doesn't reach its tipping point then it will likely be primed for rider triggers through the holiday period.

Snowpack Summary

New snow 10-25 cm, accompanied by moderate-strong SW winds will add additional load to the upper snowpack. This brings storm snow totals 40-80 cm above a very touchy surface hoar layer that was buried mid-December.  A lower layer of surface hoar is also reactive at the northern end of the range, buried down about 40cm.Below 2100 m this storm slab sits on a thick, solid crust that has been reacting as a perfect sliding layer. Storm slabs will blanket the region and be very touchy to the weight of a skier/ rider, especially in locations that has seen wind effect. A hard rain crust with facets from early November is buried over 1 m down and is still reactive to light loads in some locations.

Problems

Storm Slabs

An icon showing Storm Slabs
A thick storm slabs sits over a predominant surface hoar layer which has been very touchy to rider triggers. With additional snow, natural avalanches are likely and human triggered avalanches are very likely.
Avoid avalanche terrain during periods of heavy loading from new snow and wind.>Stick to simple terrain, small features with limited consequence and be aware of what is above you at all times.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Likely - Very Likely

Expected Size

1 - 4

Deep Persistent Slabs

An icon showing Deep Persistent Slabs
The new snow load continues to build and this could reawaken the Nov 9 layer at the bottom of the snowpack. In some parts of the region, large avalanches have been failing on a deeply buried weak layer.
Avoid common trigger zones including thin snowpack areas, near rocky outcrops, and steep alpine slopes.>Conditions may be worse in the north of the region, so get to know your local snowpack.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

3 - 5

Valid until: Dec 24th, 2014 2:00PM