Weather in Lewistown

High Wind Warning issued May 12 at 11:48PM MDT until May 14 at 6:00PM MDT by NWS Great Falls MT

Areas: Eastern Toole and Liberty; Cascade County below 5000ft; Judith Basin County and Judith Gap

12/05/2026, 23:48:00 → 13/05/2026, 17:15:00

* WHAT...Westerly winds 35 to 45 mph with gusts up to 70 mph expected. * WHERE...Eastern Toole and Liberty Counties, Cascade County below 5000ft, and Judith Basin County and Judith Gap. * WHEN...From midnight Wednesday Night to 6 PM MDT Thursday. * IMPACTS...High winds may move loose debris, damage property and cause isolated power outages. Travel could be difficult, especially for high profile vehicles.

High Wind Warning issued May 12 at 11:48PM MDT until May 15 at 12:00AM MDT by NWS Great Falls MT

Areas: Hill County; Northern Blaine County; Western and Central Chouteau County; Bears Paw Mountains and Southern Blaine; Fergus County below 4500ft; Snowy and Judith Mountains

12/05/2026, 23:48:00 → 13/05/2026, 17:15:00

* WHAT...Westerly winds 30 to 40 mph with gusts up to 70 mph expected. * WHERE...Snowy and Judith Mountains, Bears Paw Mountains and Southern Blaine, Fergus County below 4500ft, Hill County, Northern Blaine County, and Western and Central Chouteau County. * WHEN...From 3 AM Thursday to midnight MDT Thursday Night. * IMPACTS...High winds may move loose debris, damage property and cause isolated power outages. Travel could be difficult, especially for high profile vehicles.

Red Flag Warning issued May 13 at 1:58AM MDT until May 13 at 9:00PM MDT by NWS Glasgow MT

Areas: Fort Peck Reservation and Daniels/Roosevelt/Sheridan Counties; Dawson/McCone/Prairie/Richland/Wibaux Counties; Northern Valley and Northern Phillips Counties; The Little Rockies; The Lower Missouri River Breaks including the Charles M Russell National Wildlife Refuge; Southern Petroleum and Southern Garfield Counties

13/05/2026, 01:58:00 → 13/05/2026, 17:00:00

* AFFECTED AREA...Fire weather zones 120, 122, 134, 135, 136, and 137. * WIND...Southeast at 15 to 30 mph with gusts to 40 mph. * HUMIDITY...As low as 12 percent. * THUNDERSTORMS...Moderate confidence of isolated to scattered late-day thunderstorms. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended.

Severe Thunderstorm Warning issued May 13 at 6:21PM MDT until May 13 at 6:45PM MDT by NWS Great Falls MT

Areas: Fergus, MT

13/05/2026, 18:21:00 → 13/05/2026, 18:45:00

At 621 PM MDT, severe thunderstorms were located along a line extending from 16 miles northeast of Roy to 21 miles northeast of Grass Range, moving northeast at 30 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. These severe thunderstorms will remain over mainly rural areas of northeastern Fergus County.

Red Flag Warning issued May 13 at 1:51PM MDT until May 15 at 9:00PM MDT by NWS Glasgow MT

Areas: Fort Peck Reservation and Daniels/Roosevelt/Sheridan Counties; Dawson/McCone/Prairie/Richland/Wibaux Counties; Northern Valley and Northern Phillips Counties; The Little Rockies; The Lower Missouri River Breaks including the Charles M Russell National Wildlife Refuge; Southern Petroleum and Southern Garfield Counties

13/05/2026, 13:51:00 → 14/05/2026, 06:00:00

* AFFECTED AREA...Fire weather zones 120, 122, 134, 135, 136, and 137. * WIND...Southeast at 15 to 30 mph with gusts to 40 mph, then suddenly switching to the West beginning this evening. * HUMIDITY...As low as 12 percent today. 20 percent Thursday. * THUNDERSTORMS...Isolated late-day thunderstorms possible. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended.