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Archived

Avalanche Forecast

Mar 4th, 2013–Mar 5th, 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
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.

Storm snow on south aspects may become unstable due to strong solar radiation. Be aware of afternoon heating on sunny aspects.

Weather Forecast

A ridge of high pressure will develop over the area on Monday. Light southerly winds and seasonal temperatures with high diurnal swings are forecast. The ridge breaks down on Tuesday and a weak front passes through with slightly warmer temperatures and light precipitation.

Snowpack Summary

Up to 60 cm of storm snow since Friday is settling and bonding to previous surfaces. Cool temperatures have tightened the upper pack and has promoted bonding within the storm snow and on the storm snow interface, however we still expect to see some touchy storm slabs, and lingering wind slabs in the alpine.

Avalanche Summary

Explosive control on highway paths in Yoho Park produced only minimal results with little slab propagation. Control work on Sunshine Road produced a Class 3.5 that ran to ground on a slope that previously had not slid this winter. Natural over Cascade waterfall in afternoon with  solar heating.

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.
Minimize exposure to sun exposed slopes when the solar radiation is strong.Use caution in lee areas in the alpine. Recent wind loading have created wind slabs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3