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Archived

Avalanche Forecast

Jan 11th, 2017–Jan 12th, 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
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.

Steady winds from the north have blown most of the recent snow into hard slabs in unusual locations (reverse loading).  If winds pick up Thursday ice climbers should be mindful of overhead terrain.  SH

Weather Forecast

Expect alpine temperatures to be in the -15C range on Thursday, with much colder temperatures (-20's) in the valley bottoms.  NW winds will increase in the afternoon.  There is no snow in the 3 day forecast and there will be a gradual warming trend into the weekend.

Snowpack Summary

Up to 20 cm of low density snow has been blown into hard wind slabs from north winds, so expect locally deep pockets of dense wind drifts in unusual areas (reverse loading). These slabs overlie a some facet layers with the main problem being the Dec 19 interface of facets, now buried down about 50-70 cm.

Avalanche Summary

No avalanche activity reported or observed in Little Yoho today, but we have minimal observations from this area - so low confidence.

Confidence

Due to the number of field observations on Wednesday

Avalanche Problems

Wind Slabs

Winds from the north have created hard wind slabs in many areas, and these are reverse from normal locations. These slabs are hard to trigger, with a single person, but if they go it will be a dense piece of snow to ride.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Persistent Slabs

Facets buried on Dec 19 are down 50-70 cm in some locations. This is a concern wherever a more cohesive slab of snow sits on top of this weakness. Tree line or wind loaded areas seem to be the primary concern.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3