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Archived

Avalanche Forecast

Mar 5th, 2013–Mar 6th, 2013
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
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
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

Regions: Banff Yoho Kootenay.

A few more days of conservative terrain choices would be a good idea. This will allow the recent storm snow to bond to the older surfaces.

Weather Forecast

A rather benign weather pattern for the next few days will bring light winds to the alpine, no precipitation, and moderate diurnal fluctuations in temperatures (alpine highs of -10*, lows of -15*)

Snowpack Summary

Up to 60 cm of storm snow since Friday has settled to 30-40 cm. Cool temperatures have tightened the upper pack and promoted bonding within the storm snow and on the storm snow interface, however we still expect to see storm slabs that are reactive to skier triggering in steeper alpine terrain.

Avalanche Summary

Evidence of a wide-spread natural cycle up to size 3 (at treeline and above elevations) in the storm snow from previous 72 hours. Several avalanches (up to size 2.5)  observed from past 36 hours along Highway 93 North and South (all in the alpine)

Confidence

Avalanche Problems

Storm Slabs

60 cm of recent storm snow has created unstable storm snow conditions. The natural cycle is over and cooler temperatures have tightened up the upper pack, however we still expect to see touchy storm slab conditions over the next few days.
Be cautious as you transition into wind affected terrain.Choose conservative lines and watch for clues of instability.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3