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Avalanche Forecast

Jan 7th, 2019–Jan 8th, 2019
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
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
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
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Sea To Sky.

Recent winds have left behind wind slabs and built cornices. Keep track of where you are in the terrain to avoid these areas.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

TUESDAY: Around 10 cm snow beginning late morning. Freezing level near valley bottom. Moderate to strong southerly winds, with the chance of strong outflow winds at low elevations. Alpine high -5. Expect a further 10 cm snow overnight.WEDNESDAY: 10-15 cm snow. Freezing level near 1200 m. Moderate south-easterly winds. Alpine high near -3. Expect a further 20 cm snow overnight. THURSDAY: 10-15 cm snow. Freezing level near 1400 m. Moderate southerly winds. Alpine high near -2. More details can be found in the Mountain Weather Forecast.

Avalanche Summary

Numerous size 1-2 storm slabs and cornice falls were triggered by explosives control on Monday. Human triggering of avalanches slowed down. While the recent storm slab problem is improving, incoming weather is expected to create new avalanche problems by Wednesday.

Snowpack Summary

Up to 140 cm recent storm snow was shifted into slabs on slopes lee to the south-east to south-west. In general, the recent storm snow is slowly gaining strength and settling. New storm slabs are expected to build by Tuesday afternoon. At treeline and below, the storm snow sits on two weak layers that are down 80-100 cm and 150-200 cm. These layers consist of surface hoar (feathery crystals) in more sheltered areas and a crust on solar aspects and on all aspects below 1500m.In the lower snowpack, a weak layer of facets (sugary snow) is now over 200 cm deep. There have been no reports of avalanches on this layer for over a week, but it may still be reactive to heavy loads (such as a cornice fall) in isolated areas.

Avalanche Problems

Wind Slabs

Recent winds have left behind wind slabs on lee slopes at all elevations.
Be alert to conditions that change with elevation.Use ridges or ribs to avoid wind loaded slopes.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2

Cornices

Cornices can fail naturally or with the weight of a person. They make good triggers for avalanches on slopes below.
Be aware of the potential for cornice failures to trigger slab avalanches.Give cornices a wide berth when travelling on or below ridges.

Aspects: North, North East, East, North West.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2