Severe · Winter Storm WarningActive alert
Winter Storm Warning issued October 11 at 10:29AM MDT until October 12
Affecting Helena Valley; Missouri Headwaters; Madison River Valley
In effect until: Oct 12, 2026, 7:30 AM
Helena Valley; Missouri Headwaters; Madison River Valley
Likely impact; effects through 7:30 AM.
If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.
Read the original bulletin (official text)
* WHAT...Heavy, wet snow. Additional snow accumulations between 3 and 7 inches. Winds gusting as high as 40 mph. * WHERE...Helena Valley, Madison River Valley, and Missouri Headwaters. * WHEN...Until 6 AM MDT Monday. * IMPACTS...Travel could be very difficult. Gusty winds combined with the wet and heavy nature of the snow could bring down tree branches. Isolated power outages are possible. * ADDITIONAL DETAILS...Snowfall amounts will vary drastically from grassy surfaces to roadways, most notably at lower elevations, with accumulations on non-grassy surfaces being confined mainly to between the evening through late morning hours.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™