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Avalanche Forecast

Dec 7th, 2016–Dec 8th, 2016
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
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: Sea To Sky.

Wind slabs exist on all aspects at higher elevations, so the best and safest riding is in sheltered terrain.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

THURSDAY: Cloudy, 30-50 km/h east winds, alpine temperatures at -10.FRIDAY: 5-15 cm of new snow, 20-30 km/h southwest winds, alpine temperatures at -10.SATURDAY: 5-15 cm of new snow, light southwest winds, alpine temperatures at -8.

Avalanche Summary

On Tuesday, avalanche reports were limited to size 1 wind slabs, including one triggered by a natural cornice fall on a northeast alpine aspect. Explosive cornice control broke off large chunks of cornice, but did not trigger any avalanches on the slopes below. Wind slabs may remain reactive to human-triggering throughout the week in alpine and treeline terrain.

Snowpack Summary

Surface conditions are highly variable throughout the region. Last weekend strong southerly winds scoured windward features and formed hard and stubborn wind slabs on lee features. However, northeast winds are currently loading south and west aspects, resulting in a complex distribution of wind slabs in exposed terrain. Low density snow remains in sheltered areas and offers the best riding. Surface snow has begun to facet with the cold air temperatures, and will likely create a weak interface when the next storm arrives. The mid-pack is generally strong, with a widespread mid-November crust buried 70-100 cm at treeline and anywhere from 30-200 cm in alpine terrain. Recent snowpack and explosive tests have shown the crust to be unreactive, but it could remain a problem in shallow alpine start zones.

Avalanche Problems

Wind Slabs

Wind slabs are possible on any aspect in exposed terrain, as winds have shifted from the southwest to the northeast over the past few days.
Be cautious as you transition into wind affected terrain.Be aware of the potential for wide propagations due to the presence of hard windslabs.Pay attention to overhead hazards like cornices.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2