Marine Weather and Tide Forecast for Somers, MT

FXUS65 KMSO 310806 AFDMSO

Area Forecast Discussion National Weather Service Missoula MT 206 AM MDT Sun May 31 2026

DISCUSSION

KEY MESSAGES:

- Sunday through Monday: A slow moving weather system will bring prolonged, moderate to heavy rainfall, focused along the divide and in Glacier Park region.

- River, stream, and creek rises from widespread rain and snow melt, leading to the potential minor flooding.

- Widespread rain continues across northwest Montana into Tuesday.

Satellite imagery early this morning highlights a well developed closed low centered in north-central Montana. Abnormally high moisture from the central US has wrapped around this closed low, with regional radar imagery showcasing widespread rain across all of western Montana. Impressive rainfall totals have been observed so far, with numerous sites seeing greater than 1 inch of precipitation in the last 36 hours.

Forecast precipitation amounts have increased during this forecast package. This change is driven by a westward trend in the track of the low. Recent model guidance has the low slowly moving north- northwest towards the Canada-Montana border east of the divide through Tuesday morning. The highest rain totals will focus across northwest Montana, along and east of the US-93 corridor, and along the Continental Divide. These areas will continue to experience widespread rain as moisture wraps around the north- northwest quadrant of the low. Flood watches remain in effect for the Flathead and Mission Valleys and the Glacier Park region, given the combination of moderate to locally heavy rain, ongoing snowmelt, and saturated soils. Furthermore, the potential for minor flooding remains a concern for the Flathead River near Columbia Falls and the Clark Fork River near Missoula.

Looking ahead to Monday into Tuesday, rain will continue across northwest Montana as the low becomes positioned near the Canadian border east of the divide. Showers and isolated thunderstorms will develop along and south of the I-90 corridor where warmer temperatures will provide sufficient instability for convection.

High pressure will develop across the region on Wednesday, bringing a brief warming and drying trend. This change will be short-lived as the majority of ensemble guidance has a Pacific trough bringing a return of rain on Thursday.
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