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Avalanche Forecast

Archived

Jan 31st, 2025–Feb 1st, 2025

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural and human triggered avalanches likely.
Alpine
Natural and human triggered avalanches likely.
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 possible, human triggered probable.

Regions

Lizard-Flathead, Flathead, Lizard.

Travel in avalanche terrain is not recommended. Avalanches in the new snow are very likely.

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

Confidence

High

Avalanche Summary

New storm slabs will form on Friday and Saturday. Human-triggered avalanches will be very likely on steep slopes, and natural avalanches are 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 Saturday 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

Friday Night

Cloudy with 15 to 25 cm of snow. 50 to 70 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Saturday

Cloudy with 5 to 15 cm of snow. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -8 °C.

Sunday

Cloudy with 5 to 15 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -12 °C.

Monday

Mix of sun and cloud 2 to 5 cm of snow. 10 km/h east ridgetop wind. Treeline temperature -20 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Only the most simple non-avalanche terrain with no overhead hazard is appropriate at this time.
  • 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.