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Archived

Avalanche Forecast

Dec 17th, 2015–Dec 18th, 2015
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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

Regions: South Coast.

Forecast wind and new snow will develop new storm slabs and increase the avalanche danger.

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

Snow and moderate southerly winds overnight with freezing level down to 500 metres. Expect 10-15 cm in the alpine by Friday morning. Snow continuing during the day with strong westerly winds, expect another 5-15 cm during the day. Light snow overnight and during the day Saturday. Heavy snowfall Sunday morning and during the day Sunday combined with strong southwest winds.

Avalanche Summary

A few loose dry avalanches up ti size 1.5 were reported from Wednesday. Expect widespread storm slabs to develop with forecast new snow and wind.

Snowpack Summary

New snow and wind should develop new storm slabs over the 40-50cm of snow from last weekend's storm. The old surface is a mix of loose snow, wind slabs, and surface hoar in isolated areas. In the Coquihalla area, reports suggest weak surface hoar may exist below the recent storm snow, although there is some uncertainty as to its distribution and reactivity. This interface may be something to keep an eye on as the overlying slab gets deeper and gains cohesion. You'll likely find a hard rain crust buried approximately 100cm below the surface. This rain crust extends up to about 2000m. There is about 200 cm at 1800 metres in the Coquihalla.

Avalanche Problems

Storm Slabs

New storm slabs are expected to develop with forecast new snow and wind.
Avoid avalanche terrain during periods of heavy loading from new snow and wind.>Avoid travelling in areas that have been reverse loaded by winds.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3