Avalanche forecast

Flathead Range & Glacier NP

Flathead Avalanche Center
View on map

Avalanche danger

Mon
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
1 · Low
Open full map
Out of date — this forecast expired 7 months ago. You’re viewing past conditions, not the current bulletin.

Highlights

Triggering a large avalanche on a buried weak layer remains our primary concern.  Sunny slopes with a stout, supportable crust offer the safest option for navigating this challenging problem. Today's light rain may wet previously dry snow and initiate small loose slides. 

If today's storm overproduces, the danger may rise on slopes without a strong crust, where the threat of large natural and human-triggered avalanches may increase.

Avalanche problems

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1.5–2.5

    A widespread, well-preserved buried weak layer was responsible for multiple natural avalanches in the Flathead Range this week during the recent near-record warmth.  This layer lies within the top foot or so of the surface in sheltered terrain and around two feet deep on wind-loaded slopes.

    The recent heat wave has stiffened surface snow into a cohesive slab on polar aspects and a crust of varying strength on sunny slopes. You may not notice signs of instability, such as cracking or collapsing, before triggering a slide. This problem is notorious for riders remotely triggering avalanches from flat terrain above, to the side, and below steep slopes. 

    This is a near-surface problem, and hand pits are a useful tool for confirming the presence of a buried weak layer.  

    Sticking to a supportable crust will minimize the risk of impacting the weak layer. Choose low-angle slopes that are not connected to steep slopes in areas without a crust. 

    Wet Loose: Today's forecasted rain may wet previously dry snow, resulting in small wet loose slides. If the freezing line rises higher than expected, this problem will become more widespread.

     

    (2/6/2026) This is a large natural slab avalanche near the Great Northern Mountain. This occurred during the recent warming and likely failed on a buried weak layer.

Avalanche Discussion

Cooler weather and precipitation return to the Flathead today through Monday. Decreasing temperatures will be a welcome relief after the previous 4 days of near-record warmth. During the heat wave, temperatures peaked on Thursday, with upper-elevation stations reaching 50°F (image)!

Today's precipitation is forecast to be light, with a stronger pulse expected overnight. If this storm overproduces today, the danger may rise on slopes without a strong crust. Rain or snow could impact the buried weak layer by adding weight to the surface and possibly triggering a large avalanche. Rain may wet dry snow, resulting in small, wet, loose slides on northerly terrain.

Sustained sunshine and warm temperatures triggered natural slab avalanches on sunny slopes in the Flathead Range (image, image, image). We assume these failed on a buried weak layer that has been responsible for this past week's avalanche activity, including rider-triggered slides in the Whitefish Range (image, image), the Swan Range (image), and the Flathead Range (image).

This week's balmy conditions wetted the top 10+ cm on many sunny slopes, forming a crust. Cooling temperatures should make this layer supportable to riders in many locations. This strong layer will minimize the impact of both your weight and the incoming snowfall on the weak layer, and will be the safest areas to ride.    

Polar aspects remained mostly dry below the top few centimeters of the surface. These slopes remain the most dangerous and will be tested with the incoming snowfall, especially on wind-loaded slopes. Caution should be used when traveling in areas without a supportable surface crust.

Regions covered