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Archived

Avalanche Forecast

Jan 11th, 2014–Jan 12th, 2014
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Cariboos.

Confidence

Fair - Intensity of incoming weather systems is uncertain

Weather Forecast

Overnight and Sunday: Another 10 to 20 cm precipitation in the forecast. Winds remain strong from the S-SW, freezing levels should near or at valley bottoms.Monday: Light precipitation, ( 5-10 cms), winds changing to W-NW, freezing levels may rise to 1200m.Tuesday: Light flurries, moderate to strong winds from the west, freezing levels may rise to 1400m in parts of the forecast area

Avalanche Summary

There have been no reports of avalanche activity in the past few days. However professional operators in the area are still concerned about the deeply buried October facet/crust layer. Although unlikely, given enough load and/or hitting the sweet spot (i.e. thin area) it may be possible to trigger this layer resulting in a large and destructive avalanche. we should also expect to see an increase in natural and rider/skier triggered avalanches as new snow amounts continue to accumulate and the wind speeds pick up over the next couple days.

Snowpack Summary

In some parts of the forecast area, as much as 50 cm of recent storm snow overlies a variety of old snow surfaces, ranging from stiff wind slabs to a soft layer of facetted snow and/or surface hoar. A rain crust below the 1600m elevation band should now be buried over a metre, and a surface hoar or facet layer is down 160 + cm deep. Snowpack depths vary, but in general around 200cm of snow can be found at tree line with 130 to over 300 cm in the alpine. In some places we're still dealing with a relatively thin snowpack (thanks to a windy early season). The basal facet/crust combo (weak sugary snow above and below a crust) near the ground was active in an avalanche cycle last week. This weakness may be difficult to trigger but if triggered, will result in very large, destructive avalanches.

Avalanche Problems

Storm Slabs

Rising temperatures, high winds and recent snowfall make for high hazard conditions, especially in wind-loaded areas around tree line and above.
Stick to simple terrain and be aware of what is above you at all times.>Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.>The new snow will require several days to settle and stabilize.>Avoid lee and cross-loaded terrain near ridge crests.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely - Very Likely

Expected Size: 1 - 4

Persistent Slabs

Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.>Be aware of the potential for full depth avalanches due to deeply buried weak layers.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 3 - 7