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Archived

Avalanche Forecast

Dec 19th, 2016–Dec 20th, 2016
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
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
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: South Coast.

Continued snowfall and strong winds will keep the avalanche hazard elevated through the forecast period

Confidence

Moderate - Forecast snowfall amounts are uncertain

Weather Forecast

Tuesday: Flurries with periods of snow, accumulation 15-20cm / Moderate to strong southwest wind / Alpine temperature 1Wednesday: Snow, accumulation 10-20cm  / Moderate to strong southwest wind / Alpine temperature -1Thursday: Snow, accumulation 20-30cm / Moderate to strong southwest wind / Alpine temperature -0

Avalanche Summary

Expect avalanche activity to stay on the rise with new snowfall accumulating Sunday night into Monday combined with moderate wind and warming temperatures. There was natural avalanche cycle Sunday night into Monday morning with avalanche releases up to size 2. Reports indicated that avalanches to size 1.5 were being easily triggered with ski cuts.

Snowpack Summary

Up to 50cm new moist or wet new snow overlies the variable old snow surface from late last week, which includes well settled snow on southerly aspects, loose snow on shaded aspects, isolated pockets of surface hoar, and sun crusts on steep southerly aspects. With the potential for buried surface hoar means storm snow weaknesses from this latest storm will take longer than normal to stabilize. An old rain crust is reported to be down 150 cm in the North Shore mountains. This layer is still failing on snowpack tests, but is likely difficult to trigger in most places now.

Avalanche Problems

Storm Slabs

Moist new snow combined with moderate to strong southwest winds have created slabs on top of a variety of potential weak sliding layers.
Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.Avoid freshly wind loaded features, particularly in steep terrain.Be cautious as you transition into wind affected terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2