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Avalanche Forecast

Archived

Feb 2nd, 2025–Feb 3rd, 2025

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

Regions

Lizard-Flathead, Flathead, Lizard.

Although natural avalanche activity is tapering off new snow remains reactive to human triggering due to a buried weak layer.

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

Confidence

Moderate

Avalanche Summary

Saturday, several natural storm slab avalanches up to size 2.5 were reported. The new snow is poorly bonded to the old snow surface, and many size 1 human-triggered loose dry and storm slab avalanches were reported in steep terrain.

Snowpack Summary

Storm snow totals range from 40 to 60 cm, with deeper deposits in wind-loaded areas. The new snow is boding poorly to the old snow surfaces, which includes melt-freeze crusts on sun-exposed slopes, large surface hoar or facets in sheltered areas, and wind-affected snow in exposed terrain at ridgelines.

The lower snowpack is strong and bonded.

Weather Summary

Sunday Night

Mainly cloudy with light flurries, 1 to 4 cm of snow. 15 to 25 km/h east ridgetop wind. Treeline temperature -20 °C.

Monday

Mostly cloudy with a trace of new snow. 20 to 30 km/h east ridgetop wind. Treeline temperature -25 °C.

Tuesday

Mostly cloudy with a trace of new snow. 10 to 25 km/h east ridgetop wind. Treeline temperature -25 °C.

Wednesday

Clear. 10 to 25 km/h southwest ridgetop wind. Treeline temperature -20 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Use small, low consequence slopes to test the bond of the new snow.
  • Be especially cautious as you transition into wind-affected terrain.
  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • 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.