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Archived

Avalanche Forecast

Dec 20th, 2017–Dec 21st, 2017
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
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
1: Low
The avalanche danger rating in the alpine will be low
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Little Yoho.

Watch for windslabs as you enter open areas near treeline and above. Ice climbers may find windslabs developing at lower elevations when the Yoho Blow pushes through. Dress warm.

Weather Forecast

A little more snow tomorrow and then the Yoho Blow should push in. It can be brutishly cold and windy at lower elevations for a while.

Snowpack Summary

10-30 cm of soft snow now covers the Dec 15 persistent weak layer of surface hoar, sun crust or facets (depending on location). An additional 5-10 cm of snow winds are expected overnight Tuesday and may create windslabs at lower elevations..

Avalanche Summary

No new avalanches noted.

Confidence

Timing of incoming weather systems is uncertain

Avalanche Problems

Wind Slabs

The winds have been a bit unpredictable and gusty. Plumes in Yoho yesterday from the north and from the east. Yoho Blow likely to build winslabs on low elevation ice climbs.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2

Loose Dry

Climbers in steep gullies be prepared for spindrift and loose snow running down the climb. Put in lots of ice screws. Any avalanches will likely be small, but could knock you off your feet.
Be cautious of sluffing in steep terrain, particularly where the debris flows into terrain traps.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 1