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Avalanche Forecast

Dec 20th, 2013–Dec 21st, 2013
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
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
1: Low
The avalanche danger rating at treeline will be low
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: Sea To Sky.

Confidence

Fair - Due to the number of field observations

Weather Forecast

The weekend looks mostly dry, then a warm storm bring moderate precipitation arrives on Monday.Saturday and Sunday: Mostly dry, but cloudy. Winds Moderate NW'ly at ridgetop. Treeline temperatures around -2.Monday: A moderate storm is expected to hit with rising temperatures bringing around 15-20 mm preciptation. This will likely fall as rain below 1500 m and a mix of rain and snow up possibly as high as 2000 m. Strong SW winds are expected.

Avalanche Summary

No new avalanches reported.

Snowpack Summary

New snow and strong southerly winds have created pockets of touchy wind slab in exposed lee terrain and cross-loaded features, and scoured windward slopes. Roughly 20-30cm of settling storm snow overlies a variety of old surfaces which formed during the early December cold snap. These surfaces include sugary faceted snow (which may overlie a crust in some areas), spotty surface hoar in sheltered terrain, and hard wind slab on south-facing alpine terrain. The storm snow generally appears to be well bonded to this interface but instabilities may exist in isolated areas.Snowpack depths vary greatly across the region, but are significantly lower than average for this time of year. Terrain below treeline is still mostly below threshold for avalanche activity. Early season riding hazards such as rocks, stumps and logs are lurking below the surface in many areas. In glaciated terrain new snow on the surface might be just enough to hide open crevasses where supportive snow bridges have not yet developed.

Avalanche Problems

Wind Slabs

New snow and strong ridgetop winds continue to create wind slabs in the lee of ridges and terrain breaks.
Be careful with wind loaded pockets. Be aware of wide variation in snowpack depth>Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.>

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3