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Archived

Avalanche Forecast

Feb 12th, 2019–Feb 13th, 2019
Alpine
1: Low
The avalanche danger rating in the alpine will be low
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
1: Low
The avalanche danger rating in the alpine will be low
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
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: Banff Yoho Kootenay.

Cold temperatures continue to weaken the upper snowpack. Surface sluffing and small pockets of wind slab are the main concern in the region.

Weather Forecast

More tolerable temperatures are forecasted for the remainder of the week with day time highs into the negative single digits.  Minimal inputs of snow and wind for Wednesday and Thursday but as the weekend approaches a small system will move in bringing snow values of 5-10cm.

Snowpack Summary

Alpine areas are a mix of wind blasted and/or soft (faceted) surface snow depending on location - sheltered areas have 40 cm ski penetration. The Jan 17 surface hoar/crust interface can be found below 2200 m down 40-60 cm, producing moderate tests results. The lower snowpack consist of a strong mid-pack sitting over a weak faceted basel structure.

Avalanche Summary

No new avalanches observed or reported.

Confidence

Avalanche Problems

Wind Slabs

Old wind effect and isolated pockets of newly formed wind slab can be found in the alpine. Expect to find this problem most prevalent in immediate lee features off ridge crest.

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

Elevations: Alpine.

Likelihood: Unlikely

Expected Size: 1 - 1.5

Loose Dry

Consistent cold temperatures have faceted the upper snowpack. In steep alpine features loose surface snow can easily entrain mass causing small avalanches. Thin steep rocky terrain is the prime candidate for this problem.
Be careful of loose dry power sluffing in steep terrain..

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 1.5