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Archived

Avalanche Forecast

Nov 27th, 2019–Nov 28th, 2019
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
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.

The main avalanche concern continues to be the lingering wind slabs. The most inviting slopes to ski may be those harboring this problem. Ice climbers may find it on approach or between pitches.

Weather Forecast

A predominant North East flow has moved into the forecast region. Mountain top winds forecasted to be moderate to strong from the EAST overnight, & ease through Thursday.

Thursday temperatures are marginally warmer (-20 to -13 range), isolated light flurries along the Eastern part of the region,

Friday - temps warm a bit as we head into the weekend.

Snowpack Summary

Widespread wind effect in the alpine. Some concern remains for possibly triggering old wind slabs from the strong SW winds on specific lee features. The Nov 8 crust is down 20-30 cm and present up to ~2400 m. The lower snowpack is a mix of weak facets & crusts. Snowpack depths at treeline vary from 60-90 cm with up to 140 cm in lee areas.

Avalanche Summary

Although the wind slabs from last weekend have become less reactive, ski cuts and explosive work on Tuesday triggered slabs up to size 1.5, 20-30 cm thick. No new natural avalanches in past few days.

Confidence

Avalanche Problems

Wind Slabs

Widespread wind effect in the alpine.  The main concern for this problem is on lee features near ridge crests and cross loaded gulleys where slabs may be 10-30 cm thick.

  • Use caution in lee areas. Recent wind loading have created wind slabs.
  • If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

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

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2