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Archived

Avalanche Forecast

Feb 20th, 2019–Feb 21st, 2019
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
1: Low
The avalanche danger rating at treeline will be low
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
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Banff Yoho Kootenay.

Its a mixed bag of wind effect and powder at treeline and above. Thursday looks like a nice day but watch for pockets of wind slab or heavy sluffing in very steep terrain.

Weather Forecast

A cold morning (-25C) for Thursday rising to around -10C in the afternoon. It looks to be a clear day with light winds throughout the region.  Friday is calling for a small system (only a couple cm of snow) but alpine winds are forecast to be in the strong range from the West before settling down on Saturday. 

Snowpack Summary

30 to 50 cm of snow has fallen since Feb 2. Recent new snow has been affected by light to moderate westerly winds. Cold conditions continue promoting faceting of the snowpack. Down 30 to 75cm, Jan 17 surface hoar produces sudden planar shears in isolated locations treeline and below. A weak basal snowpack exists in shallow areas.

Avalanche Summary

  A size 2.5 was reported by Sunshine ski hill today.  It was a wind slab in the alpine that was 1m deep likely caused by winds from yesterday. Some other loose dry avalanches were noted in the backcountry and numerous wind slabs have been triggered (size 1-2) over the past week.

Confidence

Avalanche Problems

Wind Slabs

A mix of old and new wind slabs have been found on various aspects that in the short term will be something to watch for in the terrain. 
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Variable winds may create pockets of wind slab in some unexpected locations.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Loose Dry

A sustained period of cold weather has driven the faceting process in the upper snowpack creating weak, dry surface snow. In steep terrain, these are sensitive to small natural and human triggers and can quickly gain enough mass to affect travelers.
Avoid terrain traps, such as gullies, where the consequences of a small avalanche could be serious.Good group management is essential to manage current conditions safely.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 1.5