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Archived

Avalanche Forecast

Nov 29th, 2017–Nov 30th, 2017
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
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
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

Regions: Lizard-Flathead.

New snow is being redistributed by wind onto northeasterly and easterly slopes. Watch for scoured slopes on the windward side and "chalky" looking wind-deposited snow in lee areas. These wind slabs may be easily triggered by a skier or rider.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

THURSDAY: Mainly cloudy. Moderate west wind. Alpine temperature -6, Freezing level 1000 m.FRIDAY: Flurries, accumulation 5-10 cm. Moderate west wind. Alpine temperature -8. Freezing level 800 m.SATURDAY: Flurries, accumulation 5cm. Moderate west wind. Alpine temperature -5. Freezing level 1000 m.

Avalanche Summary

With a return to more winter-like temperatures the snow surface has refrozen since last week's rain and no recent avalanche activity has been reported. As wind continues to redistribute the new snow however, expect to find wind slabs building in lee areas above 1600 m. In the high alpine, winds have scoured southwest facing slopes, loading northerly aspects. Watch for pillowy snow and signs of instability like hollow, drum-like sounds or shooting cracks. Many areas below treeline are below threshold depths for avalanches.

Snowpack Summary

At upper elevations  about 20-40 cm of snow has fallen on the crust that formed after last week's rain and warm weather and is being redistributed by wind above 1600 m. Reports from the area indicate that the crust is supportive, up to 10 cm thick and extends to mountain top elevations on all aspects.

Avalanche Problems

Wind Slabs

Winds have redistributed the new snow forming windslabs 20 to 40 cm thick on lee slopes above 1600 m.
Be careful in wind loaded areas especially near ridge crests and roll-overs.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2