Marine and Coastal Impacts from Imelda; Unsettled Weather in the West

Swells and high surf from both Imelda and Humberto are expected to bring dangerous marine conditions and rip currents to much of the East Coast over the next several days. A series of Pacific frontal systems will bring waves of showers and thunderstorms to portions of northern California and the Pacific Northwest through midweek. Read More >

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Last Map Update: Tue, Sep 30, 2025 at 6:54:16 am MDT

Watches, Warnings & Advisories

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National Weather Service Great Falls, MT

Hazardous Weather Outlook

Thunderstorms Return Monday and Tuesday

Pattern Change This Week

Weather Spotter Talk

Thunderstorms return across the Northern Rockies Monday and Tuesday, with elevated risks for outflow wind gusts to 50 mph across north-central Idaho and west-central Montana (along and south of I-90) on Monday afternoon and evening. Atmospheric moisture will increase on Tuesday, with thunderstorms producing brief downpours, small hail, and lightning.

Get ready for a noticeable shift to more fall-like weather across western Montana and north-central Idaho this week. A pattern change beginning Monday will bring increasing chances for rain showers and a distinct cooling trend by the middle of the week. While the exact timing and rainfall amounts are still becoming clear, residents should anticipate periods of rain and scattered thunderstorms that could impact outdoor plans. Valley temperatures are expected to drop to more normal seasonal values, likely into the 60s. Stay tuned for more detailed forecasts as the week progresses.

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Marine and Coastal Impacts from Imelda; Unsettled Weather in the West

NWS Forecast Office Missoula, MT