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Archived

Avalanche Forecast

Apr 10th, 2013–Apr 11th, 2013
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
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Cariboos.

Confidence

Fair - Intensity of incoming weather is uncertain on Friday

Weather Forecast

Thursday: Light snowfall / Light northwest winds / Freezing level at 1100mFriday: Light snowfall becoming moderate in the afternoon / Strong southwest winds / Freezing level at 1100mSaturday: Light to moderate snowfall / Light southwest winds / Freezing level at 1100m

Avalanche Summary

On Monday a couple of slab avalanche to size 2.5 were remotely triggered by a skier from 300m away. The avalanches occurred on a northwest aspect in the high alpine. The early April surface hoar/ facet interface is though to be the culprit. No new avalanches were observed on Tuesday; however, observations were very limited. I would expect a new round of wind/storm slab activity in the wake of new snow and wind on Wednesday.

Snowpack Summary

At upper elevations moderate to locally heavy amounts of new snow have been shifted into deeper windslabs by steady southwest winds. About 40-75cm below the surface you are likely to find a temperature/sun crust from last week's clear weather. At the same interface you may find a touchy layer of facets or surface hoar on shaded alpine slopes above ~2400m. Where they exist these weak crystals have been responsible for large remote triggers. The variable and reactive nature of this layer suggests that it may continue to catch people by surprise. At lower elevations (below 1600m) rain has continued to saturate the snowpack. Recent snowfall and wind have made large cornices bigger and more likely to fail.

Avalanche Problems

Storm Slabs

Moderate to heavy snowfall on Wednesday has added to an existing storm/ wind slab problem. Storm slabs may be particularly touchy in wind-affected terrain, or in spots where they overlie weak surface hoar crystals.
Stay off recent wind loaded areas until the slope has had a chance to stabilize.>Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 6

Cornices

Recent wind and snowfall is adding to size and fragility to existing cornices. Cornice falls may be destructive by themselves, and may also trigger large avalanches on the slope below.
Pay attention to overhead hazards like cornices.>Give cornices a wide berth when travelling on or below ridges.>

Aspects: North, North East, East, South East.

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 6

Loose Wet

Rain at lower elevations has promoted ongoing wet snow instabilities. Watch for loose wet avalanches on steep slopes, or glide cracks in terrain with smooth ground cover.
Watch for wet loose or slab activity with forecast rain and/or warm temperatures.>

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 4