Active Weather Alerts
Flood Advisory
Issued: 9:17 PM Aug. 18, 2025 – National Weather Service
...FLOOD ADVISORY IN EFFECT UNTIL 715 PM CDT THIS EVENING... * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of north central Illinois, including the following counties, De Kalb and Lee. * WHEN...Until 715 PM CDT. * IMPACTS...Flooding may occur in poor drainage and urban areas. Roads and streets may be flooded. * ADDITIONAL DETAILS... - At 416 PM CDT, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms with rainfall rates in excess of 2 inches per hour. Up to 1.5 inches of rain have fallen. - Some locations that may experience flooding include... Sandwich, Shabbona, Lake Holiday, Hinckley, Somonauk, Waterman, Paw Paw, Sublette, Woodhaven Lakes, Lee, Compton, Steward, West Brooklyn and Lee Center. - 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 Warning
Issued: 9:09 PM Aug. 18, 2025 – National Weather Service
The National Weather Service in Chicago has issued a * Severe Thunderstorm Warning for... East central De Kalb County in north central Illinois... Kane County in northeastern Illinois... Northern DuPage County in northeastern Illinois... Northwestern Cook County in northeastern Illinois... * Until 530 PM CDT. * At 409 PM CDT, severe thunderstorms were located along a line extending from near Huntley to near Hampshire to near Lily Lake to Maple Park, moving east at 30 mph. 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... Rolling Meadows, Glendale Heights, Valley View, Bellwood, Carol Stream, Berkeley, Lily Lake, Hillside, Northlake, West Dundee, Schiller Park, West Chicago, South Elgin, Stone Park, Inverness, Elmhurst, South Barrington, Rosemont, Gilberts, Lombard, Dupage Airport, Wayne, St. Charles, Roselle, and Barrington Hills. 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. For your protection move to an interior room on the lowest floor of a building. && TORNADO...POSSIBLE; THUNDERSTORM DAMAGE THREAT...CONSIDERABLE; HAIL THREAT...RADAR INDICATED; MAX HAIL SIZE...<.75 IN; WIND THREAT...RADAR INDICATED; MAX WIND GUST...70 MPH
Severe Thunderstorm Warning
Issued: 9:06 PM Aug. 18, 2025 – National Weather Service
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT FOR EAST CENTRAL LEE...CENTRAL DE KALB AND NORTHWESTERN KANE COUNTIES... At 406 PM CDT, severe thunderstorms were located along a line extending from near Hampshire to 6 miles northwest of Lily Lake to near Paw Paw, moving east at 25 mph. HAZARD...70 mph wind gusts and nickel size hail. SOURCE...Radar indicated. IMPACT...Expect considerable tree damage. Damage is likely to mobile homes, roofs, and outbuildings. These severe storms will be near... Huntley, Hampshire, Cortland, Waterman, DeKalb, and Shabbona around 410 PM CDT. Other locations impacted by these severe thunderstorms include Lee, Burlington, and Steward. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with these storms, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && TORNADO...POSSIBLE; THUNDERSTORM DAMAGE THREAT...CONSIDERABLE; HAIL THREAT...RADAR INDICATED; MAX HAIL SIZE...0.88 IN; WIND THREAT...RADAR INDICATED; MAX WIND GUST...70 MPH
Flood Advisory
Issued: 8:49 PM Aug. 18, 2025 – National Weather Service
...FLOOD ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of north central Illinois, including the following county, De Kalb. * WHEN...Until 700 PM CDT. * IMPACTS...Flooding may occur in poor drainage and urban areas. Roads and streets may be flooded. * ADDITIONAL DETAILS... - At 347 PM CDT, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms. Up to 2 inches of rain have fallen in approximately 35 minutes near Kirkland. - Some locations that will experience flooding include... DeKalb, Sycamore, Genoa, Cortland, Kirkland, Maple Park, Kingston, Malta and Fairdale. - 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. &&
Flood Watch
Issued: 7:21 PM Aug. 18, 2025 – National Weather Service
...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... * WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...For the following counties, in Illinois, Boone, Cook, De Kalb, DuPage, Grundy, Kane, Kankakee, Kendall, La Salle, Lake, Lee, McHenry, Ogle, Will, and Winnebago, and for Lake and Porter counties in Indiana. * WHEN...Through late tonight. * IMPACTS...Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Roads and streets may be flooded. Widespread, significant street flooding possible. Area creeks and streams are already elevated, reducing how much rainfall is needed for flooding to occur. * ADDITIONAL DETAILS... - Soil moisture in many areas is above average to much above average due to recent heavy rainfall. Rivers and streams across northern Illinois are above average to much above average for this time of year. Heavy thunderstorms with rainfall rates of 2 to 4 per hour are possible through tonight, due to atmospheric moisture content much above average for this time of year. If repeated rounds of thunderstorms were to affect the same location, then isolated rainfall totals in excess of 5 inches would be possible. Heavy rainfall is likely to cause flash flooding shortly after onset, especially in urbanized areas and areas that received heavy rainfall over the weekend. - http://www.weather.gov/safety/flood PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch for flash flooding means rapid-onset flooding is possible, but not yet certain, based upon the latest forecasts. Flash flooding is a dangerous situation. Persons with interests along area rivers, creeks, and other waterways should monitor the latest forecasts and be prepared to take action should flooding develop. &&
Severe Thunderstorm Watch
Issued: 5:23 PM Aug. 18, 2025 – National Weather Service
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 599 IN EFFECT UNTIL 6 PM CDT THIS EVENING FOR THE FOLLOWING AREAS IN ILLINOIS THIS WATCH INCLUDES 14 COUNTIES IN NORTH CENTRAL ILLINOIS BOONE DE KALB LA SALLE LEE OGLE WINNEBAGO IN NORTHEAST ILLINOIS COOK DUPAGE GRUNDY KANE KENDALL LAKE IL MCHENRY WILL THIS INCLUDES THE CITIES OF ALGONQUIN, AURORA, BELVIDERE, BOLINGBROOK, BUFFALO GROVE, BYRON, CAROL STREAM, CHICAGO, COAL CITY, CRYSTAL LAKE, DEKALB, DIXON, DOWNERS GROVE, ELGIN, EVANSTON, GURNEE, JOLIET, LA SALLE, LEMONT, LOMBARD, MARSEILLES, MCHENRY, MENDOTA, MINOOKA, MORRIS, MUNDELEIN, NAPERVILLE, OAK LAWN, OREGON, ORLAND PARK, OSWEGO, OTTAWA, PARK FOREST, PLANO, ROCHELLE, ROCKFORD, SCHAUMBURG, STREATOR, SYCAMORE, WAUKEGAN, WHEATON, WILMINGTON, WOODSTOCK, AND YORKVILLE.
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