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Archived

Avalanche Forecast

Jan 23rd, 2017–Jan 24th, 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
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.

Weather Forecast

Mixed sun and cloud with no snow forecast through the middle of the week. Winds will be light from the north on Tuesday with freezing levels near surface.

Snowpack Summary

Below 1900 metres the midpack is weak and facetted. Above this elevation the snowpack is more settled. In the alpine some windslabs persist from last weeks SW winds. Snowpack tests in Emerald Lake area found isolated areas of surface hoar below last weeks storm snow. Where found this surface hoar was producing easy shears.

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Avalanche Summary

Avalanche control in Yoho Park today (Bosworth, Stephen and Mt Dennis) produced numerous size 2 and 2.5 avalanches. One size 3 was triggered on Mt Bosworth. No fresh natural avalanches were observed.

Confidence

Avalanche Problems

Wind Slabs

Lingering windslabs exist from last weeks stronger winds. Watch for these windslabs as you transition into alpine terrain.

  • Avoid steep lee and cross-loaded slopes

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

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Storm Slabs

Last weeks storm snow has settled into a 20-40 cm slab. This slab is starting to settle out, but snowpit tests show this layer to be reactive in some locations, particularly around treeline where surface hoar has been found.

  • Dig down to find and test weak layers before committing to a line.
  • Use conservative route selection, choose moderate angled and supported terrain with low consequence.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Deep Persistent Slabs

This layer is mainly a concern below treeline where the facetted snow in the lower snowpack continues to produce moderate shears.

  • Choose the deepest and strongest snowpack areas on your run.
  • Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3