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Archived

Avalanche Forecast

Mar 30th, 2017–Mar 31st, 2017
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
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
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.

Danger ratings in this area are primarily based upon the forecast of higher solar input.  Start early and watch locally for sun effect.  SH

Weather Forecast

Lots of solar input and freezing levels to 2000m Friday. There will be mainly light winds and no new snow. Temperatures will stay warm with a slight temperature inversion Saturday and a cooling trend for Sunday.

Snowpack Summary

15-25 cm of recent storm-snow sits which was turning moist Friday, sits on a well settled mid-pack. In shallow areas (eg: Field ice climbs) the base is weak and facetted and shears persist on this interface. In deeper areas (eg: Little Yoho Valley), the snowpack is settled with the deeper weak layers being less of a concern.

Avalanche Summary

Some loose, wet slides out of steep solar terrain in the alpine today on Mt. Field. No other avalanches noted.

Confidence

Timing or intensity of solar radiation is uncertain on Thursday

Avalanche Problems

Persistent Slabs

The snowpack is stabilizing after last week's cycle, and now we are left with a classic low probability, high consequence problem. Natural avalanches have mostly ceased, but triggering is still possible - especially from large loads like cornices.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 4

Cornices

There has been an increasing frequency of cornice failures this past week. Be wary of this as we transition into spring (cornice season).

  • Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.
  • Extra caution needed around cornices with current conditions.

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

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Loose Wet

A decent freeze is possible in the Little Yoho region, but the forecast for clearing skies will heat up solar aspects as we transition slowly into spring. 

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

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2