136
WWUS73 KLOT 010140
NPWLOT
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
840 PM CDT TUE JUN 30 2026
ILZ003>006-008-010>013-019>021-023-032-033-039-106>108-INZ001-002-
010-011-019-011145-
/O.CON.KLOT.XH.W.0001.000000T0000Z-260703T0500Z/
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 BYRON, OTTAWA, OXFORD, WOODSTOCK,
WAUKEGAN, DEMOTTE, YORKVILLE, ELGIN, COAL CITY, BOLINGBROOK,
RENSSELAER, OSWEGO, BUFFALO GROVE, ALGONQUIN, WHEATON, MUNDELEIN,
PLANO, MOROCCO, CAROL STREAM, OREGON, MARSEILLES, GILMAN, JOLIET,
ROCKFORD, MOKENA, FAIRBURY, CHANNAHON, PAXTON, LOMBARD, DIXON,
BEECHER, MENDOTA, LA SALLE, MCHENRY, BRADLEY, PLAINFIELD,
HAMMOND, PORTAGE, STREATOR, MORRIS, VALPARAISO, WATSEKA, DOWNERS
GROVE, KANKAKEE, GIBSON CITY, NAPERVILLE, MANHATTAN, MINOOKA,
ROCHELLE, DWIGHT, CHESTERTON, PONTIAC, ROSELAWN, SYCAMORE,
WILMINGTON, PEOTONE, GARY, FOWLER, BELVIDERE, CRYSTAL LAKE,
BOURBONNAIS, CRETE, AURORA, MERRILLVILLE, DEKALB, GURNEE, AND
KENTLAND
840 PM CDT TUE JUN 30 2026 /940 PM EDT TUE JUN 30 2026/
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT /1 AM
EDT/ THURSDAY NIGHT...
* WHAT...DANGEROUSLY HOT CONDITIONS WITH HEAT INDEX VALUES AROUND
105 EXPECTED EACH AFTERNOON.
* WHERE...NORTHERN AND CENTRAL ILLINOIS AND NORTHWEST INDIANA.
* WHEN...UNTIL MIDNIGHT CDT /1 AM EDT/ THURSDAY NIGHT.
* IMPACTS...HEAT RELATED ILLNESSES INCREASE SIGNIFICANTLY DURING
EXTREME HEAT AND HIGH HUMIDITY EVENTS.
* ADDITIONAL DETAILS...DANGEROUS HEAT IS EXPECTED TO PERSIST THROUGH
THURSDAY. THUNDERSTORMS MAY BEGIN TO BRING SOME RELIEF FROM THE
HEAT FOR PORTIONS OF NORTHERN ILLINOIS BY THURSDAY AFTERNOON OR
EVENING.
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.
ILZ103>105-011145-
/O.CON.KLOT.XH.W.0001.000000T0000Z-260703T0500Z/
NORTHERN COOK-CENTRAL COOK-SOUTHERN COOK-
INCLUDING THE CITIES OF PALATINE, SCHAUMBURG, ORLAND PARK, OAK
PARK, CHICAGO, NORTHBROOK, CICERO, DES PLAINES, OAK LAWN, CALUMET
CITY, LA GRANGE, LEMONT, PARK FOREST, OAK FOREST, AND EVANSTON
840 PM CDT TUE JUN 30 2026
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT
THURSDAY NIGHT...
* WHAT...DANGEROUSLY HOT CONDITIONS WITH HEAT INDEX VALUES AROUND
105 EXPECTED EACH AFTERNOON.
* WHERE...COOK COUNTY.
* WHEN...UNTIL MIDNIGHT CDT THURSDAY NIGHT.
* IMPACTS...HEAT RELATED ILLNESSES INCREASE SIGNIFICANTLY DURING
EXTREME HEAT AND HIGH HUMIDITY EVENTS.
* ADDITIONAL DETAILS...DANGEROUS HEAT IS EXPECTED TO PERSIST THROUGH
THURSDAY. THUNDERSTORMS MAY BEGIN TO BRING SOME RELIEF FROM THE
HEAT BY THURSDAY AFTERNOON OR EVENING.
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.
DO NOT LEAVE YOUNG CHILDREN AND PETS IN UNATTENDED VEHICLES. CAR
INTERIORS WILL REACH LETHAL TEMPERATURES IN A MATTER OF MINUTES.
PETR
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