Montana Severe Thunderstorm Warning | Effective 05/13/2026 14:46

Headline: 
Severe Thunderstorm Warning issued May 13 at 3:46PM MDT until May 13 at 4:15PM MDT by NWS Great Falls MT
Event: 
Severe Thunderstorm Warning
Urgency: 
Immediate
Effective: 
May 13, 2026 - 2:46pm
Expires: 
May 13, 2026 - 3:15pm
Description: 
At 343 PM MDT, severe thunderstorms were located along a line extending from 8 miles southeast of The Knees to 9 miles northeast of Fort Benton to 14 miles east of Geraldine to 8 miles north of Hobson, moving northeast at 50 mph. HAZARD...70 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect considerable tree damage. Damage is likely to mobile homes, roofs, and outbuildings. Blowing dust may reduce visibility to less than one mile. Brief landspout tornadoes are possible. Locations impacted include... Fort Benton, Big Sandy, Geraldine, Denton, Hobson, Winifred, The Knees, Box Elder, St. Pierre, Carter, Floweree, Danvers, Loma, Kenilworth, Hilger, Iliad, Virgelle, Moccasin, Ackley Lake State Park, and Coffee Creek.
Instruction: 
For your protection move to an interior room on the lowest floor of a building.
Area Description: 
Blaine, MT; Chouteau, MT; Fergus, MT; Hill, MT; Judith Basin, MT; Liberty, MT
Forcast Office: 
NWS Great Falls MT
Sender: 
w-nws.webmaster@noaa.gov