Bollettino valanghe

Flathead Range & Glacier NP

Flathead Avalanche Center
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Pericolo valanghe

Sat
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 8 months ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Fresh snow and wind will increase the avalanche danger this afternoon. You could trigger large avalanches on steep slopes with more than 8 inches of new and wind-blown snow. Move to less steep terrain if the snow surface cracks around your feet or machine. 

The danger may be higher in the Northern Whitefish Range, where more snow fell. The avalanche hazard will continue to rise overnight. 

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    An incoming cold front will cause fresh snow and gusty southwest winds this afternoon. Fresh wind slabs will begin to form on wind-exposed slopes. These features may develop on surface crusts, which can further increase their instability. 

    • You are most likely to find slabs downwind from ridges, saddles, and other prominent terrain features. 
    • Blowing snow is a signal that wind slabs are forming on the slopes below.
    • Etched surfaces and dune-shaped features are signs of wind-affected snow.
    • Cracks that shoot out from your feet or machine imply that you can trigger an avalanche in the new snow. 

    When in doubt, move to slopes that are less steep and/or more sheltered from the wind. 

    In areas favored by recent snowfall, you may find unstable snow on sheltered slopes. Use small, inconsequential slopes to test how the new snow bonds to the old snow surface. Consider moving to less steep terrain if you find 8+ inches of new snow. 

    (12/19/2025)

    This natural avalanche occurred from the recent windloading event (12/19/25) in steep, alpine terrain. (NE ~6700'). Today's fresh snow and wind may trigger slides like this.

    Photo: Michael Reavis

Avalanche Discussion

Today's danger will start at LOW for most of the advisory area. One potential exception is in the Northern Whitefish Range, where the Stahl Peak Snotel recorded 0.7 inches of SWE in the last 24 hours.   

All zones will see a rise in danger this afternoon as a cold front passes through northwest Montana. Changes could occur rapidly due to heavy snowfall and gusty winds. Snow squalls could cause localized areas to outperform their forecast. 

Pay attention to the weather this afternoon and give yourself an option for an early exit. Travel along wind-exposed ridges may become unpleasant if not hazardous. Try to monitor the intensity of the snowfall. Accumulation of 1+ inch per hour occurring for 3 or more hours is a common “red flag” that should steer you toward more conservative decision-making.

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