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Archived

Avalanche Forecast

Mar 1st, 2013–Mar 2nd, 2013
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
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.

Weather Forecast

For tonight and Saturday, expect rain to continue to 1800 m and snow above that.  Winds to remain moderate to strong. Late Saturday, the winds will shift to a northerly direction in advance of a cold front that could deliver another 10-15 cm to upslope regions.  Temperatures will drop through Sunday and the precipitation will end.

Snowpack Summary

Some rain below 1800m Fri afternoon, and 10-20cm snow over last 24 hrs. building soft slabs in alpine areas. Rapid settlement due to warmer temps. New snow sits over previous wind slabs to 25cm thick with stubborn hard slabs below. W of the divide the mid-pack is generally well settled. E of divide the mid-pack is faceted and weak.

Avalanche Summary

A skier accidental with no burial size 2.5 occurred on a steep cross loaded feature in the National Geographics, near Lake Louise Thursday.  The hard slab was 40-60 cm thick and ran the full length of the path.  Sunshine and Lake Louise ski hills reporting only sz.1 ski cuts and naturals out of steep ridgetop terrain, reloading through the day. 

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Wind Slabs

Developing slabs overlie existing hard windslabs.  Visibility is poor, but we expect naturals to be occurring involving these layers.  In thinner snowpack areas, avalanches may scrub to ground, incorporate the weak snow and run further than expected.
Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.Stay off recent wind loaded areas until the slope has had a chance to stabilize.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3

Cornices

  With the added load, cornices may fail and trigger slopes below.  Be mindful of over head corniced features.
Do not travel on slopes that are exposed to cornices overhead.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3