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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
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
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: South Columbia.

New snow accompanied with wind will build and develop storms slabs through the day.

Confidence

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

Weather Forecast

Monday night: Flurries, up to 15 cm by Tuesday morning. Alpine temperature -9 C, southwest wind 25-45 km/hr

Tuesday: Snow and flurries, 5-15 cm accumulating through Tuesday. Alpine temperature -4 C, southwest wind, 30-45 km/hr.

Wednesday: Flurries, 10-15 cm. Alpine temperature -7 C, west wind 25-45 km/hr.

Thursday: Mix of sun and cloud and isolated flurries. Alpine temperature -10 C, south wind 10-30 km/hr.

Avalanche Summary

The likelihood of triggering storm slab avalanches will increase through the day as new snow accumulates and is impacted by wind.

Snowpack Summary

Snow and flurries have fallen on a faceted upper snowpack and previously wind-affected surfaces. Below the 15-35 cm of old, wind-affected snow, a layer of surface hoar (feathery crystals) may be found in sheltered areas around treeline and below. In these areas old, stubborn wind slabs may still be reactive where they overly the weak surface hoar on a crust.

Snow depths range from 60-110 cm around treeline elevations. A variety of crusts from late October are buried deeper in the snowpack (down 50-90 cm). 

Avalanche Problems

Storm Slabs

Areas may receive up to 25 cm snowfall by the end of Tuesday. Avalanche danger will increase through the day as snow accumulates and is impacted by wind.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5