837 

WWUS73 KLOT 291509

NPWLOT



URGENT - WEATHER MESSAGE

National Weather Service Chicago IL

1009 AM CDT Mon Jun 29 2026



ILZ103>105-300115-

/O.CON.KLOT.XH.W.0001.260629T1700Z-260702T0300Z/

Northern Cook-Central Cook-Southern Cook-

Including the cities of Park Forest, Oak Lawn, Schaumburg, Oak

Forest, Calumet City, Palatine, Chicago, Cicero, La Grange, Oak

Park, Lemont, Orland Park, Evanston, Northbrook, and Des Plaines

1009 AM CDT Mon Jun 29 2026



...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 10 PM CDT 

WEDNESDAY...



* WHAT...Dangerously hot conditions with heat index values around 

  105 expected each afternoon.



* WHERE...Central Cook, Northern Cook, and Southern Cook Counties.



* WHEN...Until 10 PM CDT Wednesday.



* IMPACTS...Heat related illnesses increase significantly during 

  extreme heat and high humidity events.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Drink plenty of fluids, stay in an air-conditioned room, stay out of 

the sun, and check up on relatives and neighbors.



The magnitude of anticipated heat, combined with oppressive warmth 

at night will lead to hazardous conditions, particularly for the 

elderly and those with pre-existing health conditions. Residents of 

the city of Chicago can call 3 1 1 to request well being checks for 

elderly friends or family members, or for information on finding the 

nearest cooling center.



&&



$$



ILZ003>006-008-010>013-019>021-023-032-033-039-106>108-INZ001-002-

010-011-019-300115-

/O.CON.KLOT.HT.Y.0001.260629T1700Z-260702T0300Z/

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

Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-Northern

Will-Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-

Benton-

Including the cities of Oswego, Elgin, Rensselaer, Yorkville,

Crete, Morocco, Waukegan, Marseilles, Coal City, Algonquin,

Downers Grove, Wilmington, Merrillville, Oxford, Gary, La Salle,

Gilman, Paxton, Pontiac, Buffalo Grove, Roselawn, DeMotte,

Bolingbrook, Dixon, Fowler, Aurora, Hammond, Carol Stream,

Woodstock, Crystal Lake, Mokena, Beecher, Wheaton, Gurnee,

Kentland, Morris, Bourbonnais, Joliet, Portage, Byron, Lombard,

Rockford, Watseka, Manhattan, Oregon, Streator, Valparaiso,

Ottawa, Plainfield, Peotone, Gibson City, Rochelle, Fairbury,

Naperville, Plano, Mendota, Kankakee, Dwight, Mundelein, McHenry,

Belvidere, Bradley, Channahon, DeKalb, Chesterton, Minooka, and

Sycamore

1009 AM CDT Mon Jun 29 2026 /1109 AM EDT Mon Jun 29 2026/



...HEAT ADVISORY REMAINS IN EFFECT UNTIL 10 PM CDT WEDNESDAY...



* WHAT...Heat index values around 105 expected each afternoon



* WHERE...Portions of central, east central, north central, and 

  northeast Illinois and northwest Indiana.



* WHEN...Until 10 PM CDT Wednesday.



* IMPACTS...Hot temperatures and high humidity may cause heat 

  illnesses.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Drink plenty of fluids, stay in an air-conditioned room, stay out of 

the sun, and check up on relatives and neighbors.



Do not leave young children and pets in unattended vehicles. Car 

interiors will reach lethal temperatures in a matter of minutes.



&&



$$



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