Avalog Join
Archived

Avalanche Forecast

Apr 17th, 2018–Apr 18th, 2018
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
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: Jasper.

Winter continues, along with the associated great skiing and multitude of avalanche problems.  Don't let sunny skies and powder affect your decision making.

Weather Forecast

A shallow ridge of high pressure brings clearer weather while Arctic air to the north lingers until Wednesday, continuing to cool the local airmass.Moderate to strong SW winds Tuesday night will taper into Wednesday.  Alpine temps will be Low -9, High -4, with the freezing level reaching 1800m mid-day.

Snowpack Summary

New soft slabs and varied degrees of wind effect found in all open areas. The upper snowpack is very sensitive to changes in temps, solar, or precipitation of any kind. Persistent slab will continue be a reoccurring problem, especially where no previous activity has been noted.

Avalanche Summary

Visibility improved over the day and we observed evidence of a wide spread cycle capturing all sorts of problems! Deep wide slabs from steep, rocky terrain. Numerous point releases. Soft slab releases from new loaded and wind pressed features.

Confidence

Avalanche Problems

Wind Slabs

New snow and moderate to strong SW winds building fresh windslabs.
Use caution in lee areas. Recent wind loading has created wind slabs.If triggered the wind slabs may step down to deeper facet layers resulting in larger avalanches.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Cornices

Large cornices in all areas of the bulletin region. When failing these can trigger persistent instabilities and the subsequent avalanches are proving large and destructive.
Avoid travel on slopes that are exposed to cornices overhead.Minimize overhead exposure during periods of heavy loading from new snow, wind.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1.5 - 2.5

Persistent Slabs

40-100+ cm thick slabs overlie preserved facetted crystals on N aspects, these have been reactive recently.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3