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Avalanche Forecast

Dec 2nd, 2019–Dec 3rd, 2019
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
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
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.

Dangerous avalanche conditions will exist in areas with more the 30 cm of new snow.

Confidence

Moderate - Uncertainty is due to the timing, track, & intensity of the incoming weather system.

Weather Forecast

MONDAY NIGHT: 10-20 cm of snow above 1000 m, 50-80 km/h wind from the southwest, alpine temperatures around -5 C.

TUESDAY: Light precipitation throughout the day with another 10 cm of snow above 1200 m, 50-70 km/h wind from the southwest, alpine high temperatures around -2 C.

WEDNESDAY: 20-40 cm of new snow above 1000 m, 50 km/h wind from the southwest in the morning then decreasing in the afternoon, alpine high temperatures around -2 C.

THURSDAY: Mix of sun and cloud, 30 km/h wind from the southwest, alpine high temperatures around -4 C.

Avalanche Summary

Minimal avalanche activity has been reported over the past week as the snowpack is generally thin and the weather has been benign. That is about to change as significant amounts of new snow and wind are expected to form fresh slabs this week. The greatest concern will be in wind affected terrain and where the snow falls onto smooth surfaces (such as areas where there is enough snow to cover rocks and trees).

Snowpack Summary

A stormy week will bring much needed snow to the Sea to Sky region. 20-40 cm of new snow is possible by Tuesday afternoon with much more expected on Tuesday night. The new snow will cover firm wind pressed snow and hard crusts. Typical snowpack depths in the alpine currently range between 50 and 150 cm, depending on the amount of wind affect. Snowpack depths taper quickly with elevation with little to no snow below 1800 m.

Avalanche Problems

Storm Slabs

As new snow accumulates on Tuesday expect storm slabs to build at upper elevations, especially on slopes that have been loaded by the wind.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2