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Archived

Avalanche Forecast

Mar 27th, 2018–Mar 28th, 2018
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
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
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
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

Regions: Banff Yoho Kootenay.

Touchy windslabs and winloaded open areas are best avoided for a few days. Even open areas below treeline are being affected.

Weather Forecast

Temperatures will remain below freezing with moderate to strong west winds and light snow. More precipitation is expected Friday.

Snowpack Summary

Moderate to strong SW winds are creating wind slabs in alpine and treeline areas and beginning to overload cornices. 10-20 cm of recent snow sits over a melt freeze crust on solar aspects with some facets at the crust interface. In shallow snowpack areas the basal facets remain quite weak and may be susceptible to triggering with large loads.

Avalanche Summary

A skier accidental in the Sheol Valley indicates the need for continued vigilance. Poor visibility limited observations today.

Confidence

Avalanche Problems

Wind Slabs

Wind slabs and wind effect will continue to be a problem.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Pay attention to overhead hazards like cornices which could trigger slabs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5

Persistent Slabs

As the new snow increases the load over the March 15 crust on solar aspects we may start to see avalanche activity on this layer. If the facets below the crust also fail, larger propagations will be possible.
Watch for signs of instability such as whumpfing, or cracking.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5