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Archived

Avalanche Forecast

Feb 4th, 2019–Feb 5th, 2019
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
3: Considerable
The avalanche danger rating below treeline will be considerable
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
3: Considerable
The avalanche danger rating below treeline will be considerable
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: Glacier.

Natural avalanche activity has tapered off significantly in the last 24 hours. That said, human triggering remains likely, and we will probably see the odd random large natural.

Weather Forecast

Today will be cold and clear and hopefully the winds will subside; winds have been strongest at valley bottom with the Arctic outflow upon us. Temperatures may warm up to -18 in the sun today, winds are forecast to be light from the NE. No significant change in the weather is expected until Thursday...

Snowpack Summary

At treeline we received upwards of 70cm of storm snow over the weekend with strong Sth winds and mild temps. The storm snow is sitting over the Jan 31st crust on solar asp at TL and BTL. In the Alpine, the storm snow overlies old dormant wind slabs. Reverse loading over the past 24 hours will have relocated the storm snow at TL and in the Alpine.

Avalanche Summary

Over the weekend Grizzly slide path in the Connaught creek ran to size 3.5 annihilating the skin track just prior to skiers arriving. Frequent Flyer did the same and is now probably reloaded. Vague report of a large natural off of Corbin pk yesterday. Natural activity has tapered off significantly after the impressive cycle over the weekend.

Confidence

Due to the quality of field observations

Avalanche Problems

Wind Slabs

70cm of storm snow, plus strong to extreme Southerly winds created wind and storm slabs over the weekend. On Sunday Strong NE winds relocated our storm snow again into wind slabs on specific terrain features at all aspects and elevations.
Use conservative route selection, choose moderate angled and supported terrain with low consequence.Watch for whumpfing, hollow sounds, and shooting cracks.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3

Persistent Slabs

The Jan 17th Surface Hoar layer is now down 90cm+/-. This layer exists on all aspects, and is most problematic between 1400-1900m and on steep solar aspects where it overlies a crust.
Use caution on open slopes and convex rolls at treeline where buried surface hoar may be preserved.

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

Likelihood: Likely

Expected Size: 1.5 - 3