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Avalanche Forecast

Dec 20th, 2017–Dec 21st, 2017
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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: South Rockies.

Eastern and southern parts of the region saw a lot of recent snow, which will need some time to settle. A weak layer buried 30-50cm is expected to cause trouble.

Confidence

High -

Weather Forecast

Thursday: mostly dry during the day, light snow starting late afternoon. Moderate westerly winds. Treeline temperatures around -18C in the morning, warming to about -10C.Friday: Expect 4-10 cm on the ground in the morning from light overnight snow that may continue until noon. Winds becoming light easterly. Treeline temperatures around -14C.Saturday: Dry and sunny and cold. Temperatures around -20C or lower. Winds moderate northwesterly.

Avalanche Summary

An avalanche cycle was reported from the east of the region where higher snow amounts occurred. Avalanche activity is likely to decline with cooler, drier weather.

Snowpack Summary

In the southern and eastern parts of this region, up to 70 cm of snow has fallen in recent storms, combined with variable winds. In the Elk Valley, the amount of new snow is more like 30 cm. The new snow has fallen on a variety of surfaces including old crusts, wind-scoured surfaces and, in sheltered terrain at and below treeline, very large feathery surface hoar crystals. The two crusts that were buried near the end of November can be found lower in the snowpack. A third crust from the end of October exists near the base of the snowpack. Recent testing on this crust did not produce significant results.

Avalanche Problems

Storm Slabs

Storm and wind slabs are sitting over a variable snow surface that may slide readily in some places (but not all). The snow needs time to bond!
Give the recent storm snow plenty of time to bond to underlying layers.Use conservative route selection, choose moderate angled and supported terrain with low consequence.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3