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Archived

Avalanche Forecast

Mar 9th, 2013–Mar 10th, 2013
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Kootenay Boundary.

Confidence

Fair - Track of incoming weather is uncertain

Weather Forecast

Saturday night and Sunday: Winds will pick up as the next system is moving in but precipitation will not be as much as forecasted yesterday. Expect just light precipitation starting late during the day with moderate winds from the W.  Freezing levels should still rise to 1300 m. but solar radiation will be much less than Saturday.Monday:  Light precipitation amounts are expected with overcast skies, light W winds and slightly cooler temperatures and lower freezing levels. Tuesday: Timing and track of the next system is still uncertain, but there is a potential for a fairly active system that could deliver interesting amounts of precipitation.

Avalanche Summary

There was several reports of natural and skier triggered loose wet avalanches size 1-1.5 running on the underlying crust on E and S aspects and sluffing on N facing slopes.

Snowpack Summary

Recent windslabs have formed on lee features with W and E winds in the alpine and below ridgetops at treeline. Windslabs will continue building tomorrow with forecasted W winds. These will be susceptible to sledder and skier triggering. The recent snow from earlier this week is sitting on an older snow interface above 2000 m. and on a melt freeze crust below that elevation. In much of the region, up to 80 cm snow overlies a surface hoar and sun crust which is becoming less reactive to skier traffic but that is still a concern to professionals. At the surface of the snow, expect to find a new suncrust on SE-S-SW facing slopes at all elevations (especially on steep slopes), a melt-freeze crust all the way up to 2000 m. and possibly some surface hoar on shaded slopes above that elevation.

Avalanche Problems

Wind Slabs

Wind slabs have formed recently and will keep forming tomorrow. They will probably be sensitive to skier traffic.
Be extra careful on lee and cross-loaded terrain near ridge crests.>Carefully evaluate bigger terrain features by digging and testing on adjacent, safe slopes.>Give cornices a wide berth when travelling on or below ridges.>

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 5

Persistent Slabs

The 80 cm deep surface hoar/sun crust weak layer could be triggered by a cornice fall or an slab avalanche stepping down.
Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.>Give cornices a wide berth when travelling on or below ridges.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 6