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Archived

Avalanche Forecast

Feb 19th, 2025–Feb 20th, 2025
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
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
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: Flathead, Lizard, Lizard-Flathead.

Watch for persistent slabs to become more reactive as a gradual warming trend continues over the next few days.

Confidence

Moderate

Avalanche Summary

There have been numerous, small to large (size 1 to 2) dry and wet loose avalanches, both natural- and rider-triggered running in steep terrain over the past few days.

There were two reports of size 1.5 skier and snowmobile triggered persistent slab avalanches on a southeast and northwest aspects in the alpine. See details in this MIN here as well as this MIN here.

Snowpack Summary

20 to 30 cm of snow has fallen since last Friday. This storm snow is sitting on 30 to 60 cm of faceted old snow. Below this is a persistent weak layer consisting of facets and surface hoar buried in late January.

The mid and lower snowpack is generally well settled, with no other layers of concern.

Weather Summary

Wednesday Night

Cloudy with 1 to 3 cm of snow. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -8 °C.

Thursday

Mainly cloudy. 20 to 40 km/h west ridgetop wind. Treeline temperature -5 °C.

Friday

Mostly cloudy with isolated flurries. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -3 °C.

Saturday

Mostly cloudy with 2-5 cm of snow. 30 to 60 km/h southwest ridgetop wind. Treeline temperature -1 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Fresh snow rests on a problematic persistent slab, don't let good riding lure you into complacency.
  • Make observations and continually assess conditions as you travel.
  • Loose avalanches may step down to deeper layers, resulting in larger avalanches.

Avalanche Problems

Persistent Slabs

The late January weak layer is a problem where the snow above it is stiff and slabby. Read more about it in our Blog.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1.5 - 2.5

Loose Dry

Light, dry snow may gather mass as it moves downhill. Avoid being underneath steep features and above one another.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2