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Archived

Avalanche Forecast

Feb 6th, 2017–Feb 7th, 2017
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
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
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Jasper.

Recent moderate Northerly winds and 10cm of storm snow have built wind slab over a sensitive faceted interface.

Weather Forecast

Clearing throughout the day on Tuesday, cold temps (alpine high of -22), light NE winds and no new precipitation. Wednesday night will see another low pressure system move in, bringing ~20cm of snow by Thursday night, warmer temps (alpine high of -8) with strong SW winds.

Snowpack Summary

10cm of storm snow (past 48hrs) with light-moderate NE winds have loaded Southerly aspects. Surface faceting and surface hoar (Feb 3) has been buried creating a weak interface in the upper snowpack. Poor bonding between these layers is expected. The mid-pack is facetted and weak with depth hoar at its base.

Avalanche Summary

No new avalanche observations or reports today, though visibility was limited.

Confidence

Intensity of incoming weather systems is uncertain on Thursday

Avalanche Problems

Wind Slabs

Moderate NE winds have transported 10cm of storm snow onto south westerly slopes building windslab. These new slabs will bond poorly. Last week's slab from M to S winds are still suspect. Big open features and cross-loaded gulleys should be avoided.
Use caution in lee areas. Recent wind loading have created wind slabs.Keep an eye out for reverse loading created by an upslope storm.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Loose Dry

10cm of storm snow over facets can be easily triggered and grow quickly by entraining surrounding snow especially in gulley features.
Sluffs may trigger deeper instabilities.Be cautious of sluffing in steep terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2