Immediate

Responsive action SHOULD be taken immediately

Illinois Extreme Tornado Warning | Effective 08/11/2026 08:38

At 1037 AM CDT, a severe squall line capable of producing both tornadoes and extensive straight line wind damage was located over Oak Brook, moving east at 55 mph. HAZARD...Tornadoes. One tornado may be developing over Downers Grove with another over Glendale Heights. SOURCE...Radar indicated rotation. IMPACT...Flying debris will be dangerous to those caught without shelter. Mobile homes will be damaged or destroyed. Damage to roofs, windows, and vehicles will occur. Tree damage is likely.

Ohio Severe Severe Thunderstorm Warning | Effective 08/11/2026 08:40

At 1140 AM EDT, severe thunderstorms were located along a line from 7 miles southeast of Byesville to 18 miles southwest of Caldwell, or along a line from 11 miles southeast of Cambridge to 18 miles southwest of Caldwell, moving southeast at 45 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Woodsfield, Caldwell, Dudley, Senecaville, Pleasant City, Cumberland, Summerfield, Belle Valley, Lewisville, Sarahsville,

Illinois Extreme Tornado Warning | Effective 08/11/2026 08:40

At 1040 AM CDT, a severe squall line capable of producing both tornadoes and extensive straight line wind damage was located over Homer Glen, moving east at 55 mph. HAZARD...Tornado. SOURCE...Radar indicated rotation. IMPACT...Flying debris will be dangerous to those caught without shelter. Mobile homes will be damaged or destroyed. Damage to roofs, windows, and vehicles will occur. Tree damage is likely. Locations impacted include... Joliet, Naperville, Bolingbrook, Downers Grove, Romeoville,

Illinois Severe Severe Thunderstorm Warning | Effective 08/11/2026 08:40

At 1038 AM CDT, severe thunderstorms were located along a line extending from Glen Ellyn to Lockport to near Manhattan, moving east at 60 mph. This line has a history of producing extensive wind damage. THESE ARE DESTRUCTIVE STORMS FOR CENTRAL AND SOUTHERN PORTIONS OF THE CHICAGO METROPOLITAN AREA. HAZARD...80 mph wind gusts. SOURCE...Trained weather spotters. Numerous reports of 80 to 85 mph winds. IMPACT...Flying debris will be dangerous to those caught without

North Dakota Severe Severe Thunderstorm Warning | Effective 08/11/2026 08:42

At 1042 AM CDT, a severe thunderstorm was located 10 miles east of Marion, or 32 miles southeast of Jamestown, moving southeast at 30 mph. HAZARD...Golf ball size hail and 60 mph wind gusts. SOURCE...Radar indicated. IMPACT...People and animals outdoors will be injured. Expect hail damage to roofs, siding, windows, and vehicles. Expect wind damage to roofs, siding, and trees. Locations impacted include... Marion. Anyone outdoors should move to shelter inside a well-built structure

Illinois Severe Severe Thunderstorm Warning | Effective 08-11-2026 08:17

SVRLOT The National Weather Service in Chicago has issued a * Severe Thunderstorm Warning for... Eastern Kendall County in northeastern Illinois... Central Will County in northeastern Illinois... Southeastern Kane County in northeastern Illinois... Southern DuPage County in northeastern Illinois... Southeastern Cook County in northeastern Illinois... * Until 1115 AM CDT. * At 1016 AM CDT, severe thunderstorms were located along a line extending from Campton Hills to near Yorkville to near Newark,

Illinois Extreme Tornado Warning | Effective 08-11-2026 08:27

TORLOT The National Weather Service in Chicago has issued a * Tornado Warning for... Southeastern Kendall County in northeastern Illinois... Will County in northeastern Illinois... Northeastern Grundy County in northeastern Illinois... Northeastern Kankakee County in northeastern Illinois... * Until 1130 AM CDT. * At 1027 AM CDT, severe thunderstorms capable of producing both tornadoes and extensive straight line wind damage were located near Minooka, moving east at 55 mph. HAZARD...Tornado.

Indiana Severe Severe Thunderstorm Warning | Effective 08-11-2026 08:28

SVRIWX The National Weather Service in Northern Indiana has issued a * Severe Thunderstorm Warning for... North central Starke County in northwestern Indiana... Southwestern La Porte County in northwestern Indiana... * Until 1115 AM CDT. * At 1027 AM CDT, a severe thunderstorm was located over Wanatah, or near Valparaiso, moving east at 20 mph. THIS IS A DESTRUCTIVE STORM FOR THE WANATAH AREA! HAZARD...Baseball size hail and 60 mph wind gusts. SOURCE...Radar indicated. IMPACT...People and animals outdoors will be severely injured.

Illinois Extreme Tornado Warning | Effective 08-11-2026 08:29

TORLOT The National Weather Service in Chicago has issued a * Tornado Warning for... DuPage County in northeastern Illinois... East central Cook County in northeastern Illinois... * Until 1115 AM CDT. * At 1029 AM CDT, severe thunderstorms capable of producing both tornadoes and extensive straight line wind damage were located over Warrenville, or near Wheaton, moving east at 55 mph. HAZARD...Tornado. SOURCE...Radar indicated rotation. IMPACT...Flying debris will be dangerous to those caught without

Ohio Severe Severe Thunderstorm Warning | Effective 08/11/2026 08:19

SVRPBZ The National Weather Service in Pittsburgh has issued a * Severe Thunderstorm Warning for... Southwestern Belmont County in east central Ohio... Southern Guernsey County in east central Ohio... Northwestern Monroe County in east central Ohio... Southeastern Muskingum County in east central Ohio... Noble County in east central Ohio... * Until noon EDT. * At 1119 AM EDT, severe thunderstorms were located along a line from near Cambridge to 21 miles south of South Zanesville, or along a
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