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Archived

Avalanche Forecast

Jan 10th, 2014–Jan 11th, 2014
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
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Northwest Coastal.

Confidence

Fair - Intensity of incoming weather systems is uncertain

Weather Forecast

Overnight and Saturday: Moderate snowfall occurring overnight and Saturday morning / Strong to extreme variable winds / Freezing level at 500mSunday: Moderate to locally heavy snowfall / Strong to extreme southwest winds / Freezing level at 1000mMonday: Light snowfall / Strong west winds / Freezing level at 700m

Avalanche Summary

In the Bear Pass area a size 2.5 storm slab and isolated wind slabs to size 1.5 were observed. Warm temperatures promoted several size 1 loose wet avalanches in steep low elevation terrain close to Terrace. I expect a new round of wind slab activity with weather forecast for Friday night.

Snowpack Summary

The snowpack seems shallower and more faceted in the northern part of the region, and deeper with more wind slab problems in the south. Professionals in the area note there is much more snowcover variability this year compared to most years.Around the Skeena corridor 10-25cm of recently fallen snow overlies a variety of old surfaces which include surface hoar in sheltered locations, and wind-affected snow at upper elevations. Wind data suggests the new snow has most likely been pushed into wind slabs in exposed terrain. Depending on your location, you may find a facet/crust combo or surface hoar about 60cm below the surface. Reports suggest these layers are gaining strength; however, they may be worth keeping an eye on with forecast storm loading over the next few days. Below this, the mid and lower snowpack layers are mostly thought to be strong and well bonded in this area.

Avalanche Problems

Storm Slabs

Moderate snowfall and forecast strong winds overnight Friday will add to a developing storm slab. Watch for increased reactivity in wind-exposed terrain.
Be cautious as you transition into wind affected terrain.>Be alert to conditions that change with elevation.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Persistent Slabs

A weak layer of buried facets near the ground continues to be a concern in the north of the region. Watch for increased triggering in unsupported terrain with a variable or shallow snowpack.
Dig down to find and test weak layers before committing to a line.>Avoid shallow snowpack areas where triggering is more likely.>Be aware of the potential for large, deep avalanches due to the presence of buried weak layers.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Unlikely - Possible

Expected Size: 2 - 5