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Archived

Avalanche Forecast

Dec 17th, 2013–Dec 18th, 2013
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
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
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: Little Yoho.

Avalanche Control is planned for the Sunshine Road tomorrow. No skiing or climbing on Bourgeau or the Eagles. JBW

Weather Forecast

Another storm tonite will bring possibly 5-10 cm followed by cold temperatures with a brief arctic air outbreak. Another storm will moderate temperatures by the weekend.

Snowpack Summary

Approximately 25 cm storm snow with strong south-westerlies over the last two days has created touchy wind slabs in all open areas above treeline. Windward slopes are scoured. bare. The mid pack remains strong enough to support most places where the snowpack is deeper than 60cm. The base is weak DH. Isolated SH at treeline beneath storm snow.

Avalanche Summary

A fresh size 2.5 was observed above Bourgeau Right Hand Waterfall that ran down to the edge of the cliffs. The crown was blown in beneath the cornice but suspect storm snow snow slab with wind loading as the trigger.

Confidence

Forecast snowfall amounts are uncertain

Avalanche Problems

Wind Slabs

20-40cm storm snow over the past few days has been moved by strong westerly winds creating fresh, touchy slabs on steep lee features.

  • Avoid freshly wind loaded features.
  • Avoid steep slopes below cornices.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Deep Persistent Slabs

Many of the recent avalanches have been stepping down or failing at the base of the snowpack on the early season weak base..

  • Be aware of the potential for full depth avalanches due to deeply buried weak layers.
  • Choose conservative lines and watch for clues of instability.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3