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Archived

Avalanche Forecast

Feb 1st, 2014–Feb 2nd, 2014
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
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
1: Low
The avalanche danger rating at treeline will be low
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
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Little Yoho.

Good skiing West of the divide in sheltered areas.  Avoid thin areas in big alpine features as the basal layer can still be triggered.  SH

Weather Forecast

Light N winds Sunday with a mix of sun and cloud and a trace of snow. Temperatures will again be in the minus 20's in the mornings, and highs in the -10 to -15C range.

Snowpack Summary

5-15cm of snow over the Jan 30th surface hoar/sun crust layer. Surface hoar most prominent at treeline and below. In Yoho today, thin wind slabs (15cm) over 5cm sun crust on steep S aspects reactive to skier triggering. The basal facets remain weak, but the overall snowpack is gaining strength. Glacial coverage very thin for this time of year.

Avalanche Summary

One size 2 natural cornice triggered avalanche on a SE aspect in Yoho occurred within the last 48 hours.  This was a thin slab in extreme terrain.

Confidence

on Sunday

Avalanche Problems

Deep Persistent Slabs

Thin snowpack areas in steep, alpine terrain will be the place to trigger the basal depth hoar/crust. 

  • Be aware of thin areas that may propogate to deeper instabilites.
  • Be aware of the potential for full depth avalanches due to deeply buried weak layers.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3

Storm Slabs

Places which have a well defined sun crust will be the most susceptible to triggering a storm slab.  At the moment these are of lower consequence and thin (15-30cm) and isolated to specific terrain features.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2