Archived

Avalanche Forecast

Nov 20th, 2011–Nov 21st, 2011

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

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

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

Regions: Banff Yoho Kootenay.

The temperature will rise late on Tues with accompanying snowfall (~15-20cm @ TL), confidence fair. Wind will remain light from SW. Danger rating will increase to CON Weds morning. Note: Surface Hoar currently on surface in isolated areas: Alp + TL.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Track of incoming weather systems is uncertain on Wednesday

Avalanche Problems

Persistent Slabs

The basal facets and depth hoar layer is between 30 and 50cm deep. This layer produced whumphing in flat terrain near Sunshine Village today. Snow pack tests on this layer produced easy results. Steep open features are to be treated with caution.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3

Wind Slabs

Wind slabs between 20 and 40cm deep are lingering in leeward terrain in the alpine. Although forecasted to be small in size, wind-slabs that are triggered by riders or climbers will likely result in injury rather than burial.

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

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2