Avalanche Forecast

Issued: Feb 18th, 2025 4:00PM

The alpine rating is considerable, the treeline rating is considerable, and the below treeline rating is moderate. Known problems include Storm Slabs and Persistent Slabs.

Avalanche Canada Avalanche Canada, Avalanche Canada

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New snow may hide buried problems. In areas with greater than 30 cm accumulation, treat the danger as HIGH.

Summary

Confidence

Moderate

Avalanche Summary

There were a few size 1 to 1.5 slab avalanches reported over the weekend. These were running southwest through north aspects at treeline and in the alpine. There were also some reports of whumpfing and cracking in the Mt Cokely area.

If you are heading into the backcountry, consider posting a MIN.

Snowpack Summary

New snow falls on about 15 to 30 cm of snow from the weekend. This sits on old wind-affected snow, facets or surface hoar in sheltered areas, or a melt freeze crust.

At upper elevations, wind blowing from a variety of directions has redistributed storm snow into fresh wind slabs in lee terrain.

A widespread crust, sometimes accompanied by a thin layer of weak facets, is buried 30 to 70 cm beneath predominantly low-density snow.

The mid and lower snowpack contains no other layers of concern.

Weather Summary

Tuesday Night

Cloudy with 10 to 30 mm of mixed precipitation. 50 to 90 km/h southeast ridgetop wind. Freezing level 1300 m.

Wednesday

Cloudy with 15 to 30 mm of mixed precipitation. 50 to 90 km/h south ridgetop wind. Freezing level 1300 m

Thursday

Cloudy with up to 15 mm of mixed precipitation. 30 to 50 km/h west ridgetop wind. Freezing level 1200 m.

Friday

Cloudy with 15 to 35 cm of mixed precipitation. 50 to 90 km/h southwest ridgetop wind. Freezing level 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Minimize exposure during periods of heavy loading from new snow and wind.
  • Use small, low consequence slopes to test the bond of the new snow.
  • Fresh snow rests on a problematic persistent slab, don't let good riding lure you into complacency.

Problems

Storm Slabs

An icon showing Storm Slabs

New snow will form reactive storm slabs, continued high winds throughout the storm may create much deeper slabs in lee areas.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Very Likely

Expected Size

1 - 2

Persistent Slabs

An icon showing Persistent Slabs

A combination of buried surface hoar, facets, and old crust will reactivate with the addition of new snow.

This weak layer likely no longer exists on solar aspects and lower elevations, where recent warming will have destroyed it.

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

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1.5 - 2.5

Valid until: Feb 19th, 2025 4:00PM

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