WGUS63 KLOT 190224

FFALOT



Flood Watch

National Weather Service Chicago IL

924 PM CDT Mon Aug 18 2025



ILZ003>006-008-010>013-019>021-023-103>108-INZ001-002-190900-

/O.CON.KLOT.FA.A.0009.000000T0000Z-250819T0900Z/

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-La

Salle-Kendall-Grundy-Kankakee-Northern Cook-Central Cook-Southern

Cook-Northern Will-Southern Will-Eastern Will-Lake IN-Porter-

Including the cities of Wheaton, Yorkville, Streator, Waukegan,

Mokena, Chesterton, DeKalb, Belvidere, Crystal Lake, Peotone,

Oregon, Woodstock, Plano, Bradley, Calumet City, Bolingbrook,

Aurora, McHenry, Evanston, Byron, Cicero, Channahon, Oswego, Oak

Lawn, Oak Forest, La Grange, Rockford, Gurnee, Oak Park,

Bourbonnais, Lemont, Park Forest, Morris, Hammond, Merrillville,

Northbrook, Rochelle, Valparaiso, Marseilles, Orland Park,

Buffalo Grove, Schaumburg, Manhattan, Ottawa, Kankakee, Downers

Grove, Palatine, Naperville, Elgin, Mundelein, Wilmington,

Sycamore, Crete, Beecher, Gary, Lombard, Algonquin, Joliet,

Chicago, Portage, Dixon, Carol Stream, Mendota, Minooka, Des

Plaines, Coal City, Plainfield, and La Salle

924 PM CDT Mon Aug 18 2025



...FLOOD WATCH REMAINS IN EFFECT UNTIL 4 AM CDT TUESDAY...



* WHAT...Flash flooding caused by excessive rainfall continues to be 

  possible.



* WHERE...Portions of Illinois, including the following areas, 

  Boone, Central Cook, De Kalb, DuPage, Eastern Will, Grundy, Kane, 

  Kankakee, Kendall, La Salle, Lake IL, Lee, McHenry, Northern Cook, 

  Northern Will, Ogle, Southern Cook, Southern Will and Winnebago 

  and northwest Indiana, including the following areas, Lake IN and 

  Porter.



* WHEN...Until 4 AM CDT Tuesday.



* 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. Area creeks and streams are already elevated, 

  increasing the risk of flooding due to additional rainfall. 

  Extensive street flooding possible.



* ADDITIONAL DETAILS...

  - Heavy thunderstorms with rainfall rates of 2 to 3 per hour

    will continue in some locations this evening into the early

    overnight hours. Numerous streets are either closed or have

    reports of significant standing water. 3 to 8 inches of

    rainfall have occurred thus far this afternoon and evening,

    with the highest amounts along the Interstate 80 corridor.

    With continued localized heavy rainfall and saturated soils,

    any additional rainfall will immediately lead to flooding.

  - http://www.weather.gov/safety/flood



PRECAUTIONARY/PREPAREDNESS ACTIONS...



A Flood Watch for flash flooding means additional rapid-onset 

flooding is possible 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 or worsen. Turn 

around don't drown. Flooding can be dangerous to detect at night, so 

please heed all road closures.



&&



$$



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