Archived

Avalanche Forecast

Apr 20th, 2012–Apr 21st, 2012

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

3: Considerable

The avalanche danger rating below treeline will be considerable

Alpine

2: Moderate

The avalanche danger rating in the alpine will be moderate

Treeline

3: Considerable

The avalanche danger rating at treeline will be considerable

Below Treeline

3: Considerable

The avalanche danger rating below treeline will be considerable

Regions: Banff Yoho Kootenay.

Conditions are good while frozen, but large triggers such as cornices are still creating full depth releases on the basal depth hoar/October crust. A sharp rise in temperatures with freezing levels reaching 3000 metres by Monday will increase Danger.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Freezing levels are uncertain on Monday

Avalanche Problems

Cornices

With warm temperatures and high freezing levels the very large cornices are beginning to fall off. A size 3.5 cornice triggered avalanche was observed today in Kootenay that was 400m wide up to 4 metres deep and ran 1100 metres to the creek.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 3 - 4

Loose Wet

Loose wet and some wet slab avalanches are running in lower elevations with daytime heating and solar effect. Be sure to travel only while frozen.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3