Archived

Avalanche Forecast

Mar 29th, 2014–Mar 30th, 2014

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

2: Moderate

The avalanche danger rating below treeline will be moderate

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

2: Moderate

The avalanche danger rating below treeline will be moderate

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

2: Moderate

The avalanche danger rating below treeline will be moderate

Regions: Banff Yoho Kootenay.

Excellent skiing conditions. We are more concerned with the Feb.10th/basal layers in thin snowpack areas (mainly E of the divide) than the deeper snowpack regions (mainly W of the divide.)

Weather Forecast

15cm is expected in the Bow Summit area, 10 in Lake Louise and Sunshine areas on Sunday. Winds will be light gusting moderate and temperatures will be cool in the alpine and will go above freezing in the valley bottoms. On Mon and Tues, clearing skies and light winds may raise the hazard on solar aspects in the afternoon.

Snowpack Summary

Up to 47cm HST, generally bonding well with more wind effect today in alpine areas. In shallow, weaker snowpack areas, the basal facets and Feb10 layers are still reactive in field tests. In deeper, uniform areas these problems are less of a concern. On S aspects there are a few buried suncrusts. Moist snow below 1600m today in Yoho on all aspects.

Avalanche Summary

On a flight E of the Lake Louise ski area today, numerous avalanches were observed in alpine areas mainly on E and SE aspects within the last 24-36 hours. These appeared to be either in the recent HST or on a deeper layer, likely the Feb.10th. A skier accidental sz 1-1.5 was also reported in the Lipalians today which went to ground (80cm).

Confidence

Freezing levels are uncertain on Monday

Avalanche Problems

Persistent Slabs

In areas with uneven, shallower or weaker snowpacks, we remain concerned with the Feb 10th midpack layer of crust/facets/surface hoar, and the basal layer. Choose conservative, well supported terrain in these areas.

Use conservative route selection, choose moderate angled and supported terrain with low consequence.Be wary of slopes that did not previously avalanche

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3

Wind Slabs

These are mainly confined to the immediate lees of ridges. Monitor slab development with wind gusts tomorrow as this may develop into more of a problem.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2