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Avalanche Forecast

Archived

Feb 1st, 2025–Feb 2nd, 2025

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Lizard-Flathead, Flathead, Lizard.

Conservative terrain selection is essential. Avalanches are likely due to continued snow and wind.

Check out the new Forecaster Blog "Shifting your Mindset".

Confidence

Moderate

Avalanche Summary

Saturday, several natural storm slab avalanches up to size 2 were reported. The new snow is poorly bonded to the old snow surface, and many size 1 human-triggered loose dry avalanches in steep areas were also reported.

Storm slabs will continue to form on Sunday. Human-triggered avalanches will be likely on steep slopes, and natural avalanches could be expected anywhere with more than 30 cm of new snow.

Snowpack Summary

Ongoing snow and wind will build reactive storm slabs over the weekend, with storm totals reaching 30 to 50 cm by Sunday afternoon. The new snow will bond poorly to the old snow surfaces, which includes melt-freeze crusts on sun-exposed slopes, large surface hoar or facets on shaded slopes, and wind-affected snow in exposed terrain at ridgelines.

The lower snowpack is strong and bonded.

Weather Summary

Saturday Night

Cloudy with up to 10 cm of snow. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -10 °C.

Sunday

Cloudy with up to 15 cm of snow. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -12 °C.

Monday

Mostly cloudy with a trace of new snow. 30 km/h northeast ridgetop wind. Treeline temperature -20 °C.

Tuesday

Clearing. 15 km/h northeast ridgetop wind. Treeline temperature -15 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • It's a good day to make conservative terrain choices.
  • Choose simple, low-angle terrain without steep convex rolls.
  • Avoid freshly wind-loaded terrain features.
  • Be aware of the potential for remote triggering and large avalanches due to buried surface hoar.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.