Iowa Severe Thunderstorm Warning - Severe | Effective 06/11/2026 06:25

Headline: 
Severe Thunderstorm Warning issued June 11 at 8:25AM CDT until June 11 at 9:30AM CDT by NWS Des Moines IA
Event: 
Severe Thunderstorm Warning
Urgency: 
Immediate
Effective: 
June 11, 2026 - 6:25am
Expires: 
June 11, 2026 - 7:30am
Description: 
SVRDMX The National Weather Service in Des Moines has issued a * Severe Thunderstorm Warning for... Poweshiek County in central Iowa... Southeastern Hardin County in central Iowa... Marshall County in central Iowa... Southern Black Hawk County in northeastern Iowa... Northeastern Marion County in south central Iowa... Tama County in central Iowa... Northern Mahaska County in south central Iowa... Southern Grundy County in central Iowa... Eastern Jasper County in central Iowa... * Until 930 AM CDT. * At 824 AM CDT, severe thunderstorms were located along a line extending from near Marshalltown Municipal Airport to 5 miles east of Gilman to near Sully, moving east at 45 mph. HAZARD...70 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect considerable tree damage. Damage is likely to mobile homes, roofs, and outbuildings. * Locations impacted include... Marshalltown, Newton, Grinnell, Toledo, Montezuma, Tama, La Porte City, Traer, Reinbeck, Brooklyn, Dysart, Conrad, Iowa Speedway, Meskwaki Casino, Rock Creek Lake, Gladbrook, Le Grand, Victor, Washburn, and Sully. This includes the following highways... Interstate 80 between mile markers 166 and 204. Interstate 380 between mile markers 56 and 62.
Instruction: 
This is a DANGEROUS SITUATION. These storms are producing sporadic wind damage across eastern Iowa. SEEK SHELTER NOW inside a sturdy structure and stay away from windows! A Tornado Watch remains in effect until 300 PM CDT for central and south central Iowa.
Area Description: 
Black Hawk, IA; Grundy, IA; Hardin, IA; Jasper, IA; Mahaska, IA; Marion, IA; Marshall, IA; Poweshiek, IA; Tama, IA
Forcast Office: 
NWS Des Moines IA
Sender: 
w-nws.webmaster@noaa.gov