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Archived

Avalanche Forecast

Apr 12th, 2017–Apr 13th, 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
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
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
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.

Forecasted freezing levels and precip amounts are uncertain tomorrow.

Weather Forecast

Light amounts of precip (~10cm) and light wind are expected over the next 48 hours. Temps will be cooler than seasonal with valley bottom being just above 0 and 3000m temps will hover around -10.

Snowpack Summary

Up to 30cm of snow has fallen in the last several days above 2000m. At lower elevations the snowpack is moist on solar aspects while the upper elevation snow remains cold. There is still some uncertainty surrounding the weaker basal facets in thin snowpack areas of the Little Yoho region with occasional sudden collapse test results in the facets.

Avalanche Summary

No new avalanches were observed or reported on Wednesday, but field teams were not in the Little Yoho area.

Confidence

Freezing levels are uncertain on Thursday

Avalanche Problems

Persistent Slabs

The snowpack is gaining strength however the basal facets remain a concern in thin snowpack areas and large triggers could create big avalanches on these facets. Use caution in steep terrain and avoid thin snowpack areas when possible.

  • Pay attention to overhead hazards like cornices which could trigger the deep persistent slab.
  • Choose the deepest and strongest snowpack areas on your run.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 4

Cornices

April is cornice failure season, and we are getting regular reports of cornices failing and triggering deep slabs. Mature cornices can break much further back than you expect, so give them a wide margin when traveling on ridges.

  • Pay attention to overhead hazards like cornices which could trigger slabs.
  • Give cornices a wide berth when travelling on or below ridges.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3