Areal Flood Watch for McHenry Co., IL until 4:00 AM CDT 8/19

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WGUS63 KLOT 181921
FFALOT

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Chicago IL
221 PM CDT Mon Aug 18 2025


/O.NEW.KLOT.FA.A.0009.250818T1921Z-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 Oak Lawn, Buffalo Grove, Oak Park,
Crystal Lake, Rockford, Wheaton, Channahon, Portage, Minooka,
Cicero, Marseilles, La Salle, Elgin, Kankakee, Palatine, Orland
Park, Downers Grove, Mendota, DeKalb, Naperville, Dixon, Lombard,
Ottawa, Streator, Bourbonnais, Gurnee, Evanston, Wilmington,
Beecher, Merrillville, Belvidere, Byron, Mundelein, Crete, La
Grange, Woodstock, Northbrook, Bradley, Waukegan, Valparaiso,
Lemont, McHenry, Chesterton, Carol Stream, Chicago, Manhattan,
Schaumburg, Bolingbrook, Sycamore, Oregon, Mokena, Peotone,
Rochelle, Morris, Oak Forest, Oswego, Park Forest, Joliet,
Calumet City, Algonquin, Des Plaines, Yorkville, Aurora,
Plainfield, Hammond, Gary, Coal City, and Plano
221 PM CDT Mon Aug 18 2025

...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 a...

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