Active Weather Alerts
Tornado Warning
Issued: 3:10 PM Aug. 11, 2026 – National Weather Service
The National Weather Service in Chicago has issued a * Tornado Warning for... Northern Kendall County in northeastern Illinois... Northwestern Will County in northeastern Illinois... Southern Kane County in northeastern Illinois... Southern DuPage County in northeastern Illinois... Southwestern Cook County in northeastern Illinois... * Until 1100 AM CDT. * At 1010 AM CDT, severe thunderstorms capable of producing both tornadoes and extensive straight line wind damage were located near Yorkville, 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... Aurora, Joliet, Naperville, Bolingbrook, Wheaton, Downers Grove, Lombard, Romeoville, Plainfield, Woodridge, Oswego, Batavia, Lockport, New Lenox, Homer Glen, Mokena, Yorkville, Hinsdale, Lemont, Plano, Burr Ridge, Oak Brook, Westmont, Lisle, and Darien. PRECAUTIONARY/PREPAREDNESS ACTIONS... Heavy rainfall may hide this tornado. Do not wait to see or hear the tornado. TAKE COVER NOW! This cluster of thunderstorms is capable of producing tornadoes and widespread significant wind damage. Do not wait to see or hear the tornado. For your protection move to an interior room on the lowest floor of a building. && TORNADO...RADAR INDICATED; MAX HAIL SIZE...0.00 IN
Severe Thunderstorm Warning
Issued: 3:02 PM Aug. 11, 2026 – National Weather Service
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 AM CDT FOR KANE AND MCHENRY COUNTIES... At 1002 AM CDT, severe thunderstorms were located along a line extending from near Genoa to near Maple Park to near Sandwich, moving east at 55 mph. This line of storms has a history of producing wind damage. HAZARD...70 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect considerable tree damage. Damage is likely to mobile homes, roofs, and outbuildings. Locations impacted include... Aurora, Elgin, Bartlett, Crystal Lake, Carpentersville, St. Charles, Algonquin, Lake in the Hills, West Chicago, McHenry, Batavia, Woodstock, Huntley, Geneva, Campton Hills, Harvard, Island Lake, Marengo, South Elgin, Montgomery, Cary, North Aurora, Sugar Grove, Pingree Grove, and Gilberts. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain alert for a possible tornado! Tornadoes can develop quickly from severe thunderstorms. If you spot a tornado go at once into the basement or small central room in a sturdy structure. Prepare immediately for damaging winds and deadly cloud to ground lightning. Seek shelter inside a well-built structure. Stay away from windows. && TORNADO...POSSIBLE; THUNDERSTORM DAMAGE THREAT...CONSIDERABLE; HAIL THREAT...RADAR INDICATED; MAX HAIL SIZE...<.75 IN; WIND THREAT...OBSERVED; MAX WIND GUST...70 MPH
Flood Advisory
Issued: 2:59 PM Aug. 11, 2026 – National Weather Service
...FLOOD ADVISORY IN EFFECT UNTIL 2 PM CDT THIS AFTERNOON... * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Northern Grundy County in northeastern Illinois... Kane County in northeastern Illinois... Kendall County in northeastern Illinois... * WHEN...Until 200 PM CDT. * IMPACTS...Flooding may occur in poor drainage and urban areas. Roads and streets may be flooded. * ADDITIONAL DETAILS... - At 959 AM CDT, Doppler radar and automated rain gauges indicated a line of intense thunderstorms with rainfall rates of 1 to 2 inches per hour moving into the area. Localized flooding of roadways and poor drainage areas will occur slightly after the onset of rainfall. - Some locations that will experience flooding include... Aurora, Elgin, Carpentersville, St. Charles, Oswego, Algonquin, Batavia, Huntley, Geneva, Yorkville, Morris, Channahon, Campton Hills, Minooka and Plano. - http://www.weather.gov/safety/flood PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Advisory means minor flooding along waterways and other poor drainage areas is imminent or may already be occurring. Persons in the advisory area should use caution and avoid flood waters. &&
Severe Thunderstorm Watch
Issued: 2:53 PM Aug. 11, 2026 – National Weather Service
IL . ILLINOIS COUNTIES INCLUDED ARE BOONE BUREAU CARROLL CHAMPAIGN COOK DE KALB DUPAGE FORD GRUNDY HENDERSON HENRY IROQUOIS JO DAVIESS KANE KANKAKEE KENDALL KNOX LAKE LA SALLE LEE LIVINGSTON MCHENRY MCLEAN MARSHALL MERCER OGLE PEORIA PUTNAM ROCK ISLAND STARK STEPHENSON TAZEWELL VERMILION WARREN WHITESIDE WILL WINNEBAGO WOODFORD
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