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Avalanche Forecast

Archived

Feb 3rd, 2025–Feb 4th, 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, human triggered possible.

Regions

Lizard-Flathead, Flathead, Lizard.

Increasing winds might develop fresh, sensitive wind slabs on south and west slopes. Avoid areas where snow feels stiff or slabby.

Check out the Forecaster Blog "Shifting your Mindset".

Confidence

Moderate

Avalanche Summary

On Sunday, avalanche control produced several explosive-triggered storm slab avalanches size 1.5 to 2.5, and numerous dry loose avalanches, size 1 to 1.5, on northeast aspects at treeline.

On Saturday, several natural storm slab avalanches were reported up to size 2.5 on northerly aspects.

We expect new snow will remain reactive to skier traffic on Tuesday, anywhere winds have formed slabs and fast-moving dry loose avalanches in steep terrain.

Snowpack Summary

Storm snow totals range from 40 to 70 cm, with deeper deposits in wind-loaded areas. Northeast winds increasing on Monday evening might develop fresh wind slabs on south and west facing slopes.

The storm snow has bonded 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

Monday Night

Cloudy with light flurries, 1 to 2 cm. 20 to 35 km/h east ridgetop wind. Treeline temperature -27 °C.

Tuesday

Cloudy with light flurries, 1 to 3 cm. 10 to 25 km/h east ridgetop wind. Treeline temperature -26 °C.

Wednesday

Mainly sunny. 10 to 25 km/h southwest ridgetop wind. Treeline temperature -16 °C.

Thursday

Clear. 10 km/h southwest ridgetop wind. Treeline temperature -14 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Use small, low consequence slopes to test the bond of the new snow.
  • Be aware of the potential for remote triggering and large avalanches due to buried surface hoar.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.

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.