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Archived

Avalanche Forecast

Apr 11th, 2017–Apr 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
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

Regions: Little Yoho.

Spring squalls may bring local variations in new snow amounts. If you are seeing more new snow than forecasted in your areas, the danger may be elevated!

Weather Forecast

Unsettled spring weather could bring as much as 5-10 cm of new snow on Wednesday with light SE winds and temperatures remaining cool. Freezing levels are forecast to stay below 1900m.  Thursday could see another 5-10 cm of snow with freezing levels rising to ~ 2100m. Friday should bring a drying trend as a ridge builds over the coast.

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 Tuesday, but field teams were not in the Little Yoho area.

Confidence

Intensity of incoming weather systems is uncertain on Thursday

Avalanche Problems

Persistent Slabs

The snowpack is slowly 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.

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

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.

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

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3