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Avalanche Forecast

Nov 15th, 2011–Nov 16th, 2011
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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
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
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: Northwest Coastal.

This bulletin is based on limited data. Local variation in conditions and danger levels are likely to exist. To produce more accurate forecasts, we need information. Please send an email to forecaster@avalanche.ca.

Confidence

Poor - Due to limited field observationsfor the entire period

Weather Forecast

Wednesday: 20-30cm of new snow with freezing levels around 800m and strong southerly winds.Thursday: Another 5-10cm of new snow expected with freezing levels dropping to valley bottoms and light to moderate southwest winds.Friday: Relatively clear, dry and calm weather is expected.

Avalanche Summary

Recent reports include natural slab avalanches up to 60cm thick triggered by heavy loading during storms. The possibility for natural and human-triggered wind and storm slabs is expected to remain for the forecast period.

Snowpack Summary

Total snowpack depth is around180 cm for most treeline areas and over 2 metres in the alpine. Whumpfing, cracking, and easy shears were found within and under the 40-50cm of recent storm snow. The mid and lower snowpack is generally well settled and strong, with an old rain crust near the ground.

Avalanche Problems

Wind Slabs

Near ridgecrests and terrain breaks, and in cross-loaded gullies.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 5

Storm Slabs

Steep unsupported slopes.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 4