285
WWUS73 KLOT 031514
NPWLOT
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
1014 AM CDT THU SEP 3 2026
ILZ103-104-031615-
/O.CAN.KLOT.XH.W.0003.000000T0000Z-260904T0000Z/
NORTHERN COOK-CENTRAL COOK-
INCLUDING THE CITIES OF LA GRANGE, NORTHBROOK, SCHAUMBURG, CHICAGO,
EVANSTON, OAK PARK, OAK LAWN, CICERO, PALATINE, AND DES PLAINES
1014 AM CDT THU SEP 3 2026
..EXTREME HEAT WARNING IS CANCELLED
AN OUTFLOW BOUNDARY IS DROPPING SOUTH ACROSS NORTHERN IL THIS
MORNING. A COOLER AIRMASS IN ITS WAKE WILL PROVIDE SOME RELIEF FROM
THE EXTREME HEAT THIS AFTERNOON.
ILZ003-008-011-031615-
/O.CAN.KLOT.HT.Y.0006.000000T0000Z-260904T0200Z/
WINNEBAGO-OGLE-DE KALB-
INCLUDING THE CITIES OF ROCHELLE, BYRON, DEKALB, SYCAMORE, ROCKFORD,
AND OREGON
1014 AM CDT THU SEP 3 2026
..HEAT ADVISORY IS CANCELLED
AN OUTFLOW BOUNDARY IS DROPPING SOUTH ACROSS NORTHERN IL THIS
MORNING. A COOLER AIRMASS IN ITS WAKE WILL PROVIDE SOME RELIEF FROM
THE EXTREME HEAT THIS AFTERNOON.
ILZ004-005-012-013-031615-
/O.CAN.KLOT.HT.Y.0006.000000T0000Z-260904T0000Z/
BOONE-MCHENRY-KANE-DUPAGE-
INCLUDING THE CITIES OF CRYSTAL LAKE, DOWNERS GROVE, NAPERVILLE,
WOODSTOCK, MCHENRY, ELGIN, ALGONQUIN, LOMBARD, BELVIDERE, AURORA,
WHEATON, AND CAROL STREAM
1014 AM CDT THU SEP 3 2026
..HEAT ADVISORY IS CANCELLED
AN OUTFLOW BOUNDARY IS DROPPING SOUTH ACROSS NORTHERN IL THIS
MORNING. A COOLER AIRMASS IN ITS WAKE WILL PROVIDE SOME RELIEF FROM
THE EXTREME HEAT THIS AFTERNOON.
ILZ105-040000-
/O.CON.KLOT.XH.W.0003.000000T0000Z-260904T0000Z/
SOUTHERN COOK-
INCLUDING THE CITIES OF LEMONT, PARK FOREST, OAK FOREST, ORLAND PARK,
AND CALUMET CITY
1014 AM CDT THU SEP 3 2026
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...
* WHAT...DANGEROUSLY HOT CONDITIONS WITH HEAT INDEX VALUES OF 100 TO
105 EXPECTED. THIS IS THE THIRD DAY IN A ROW WITH A FORECAST OR
OBSERVED MAXIMUM HEAT INDEX OVER 100 DEGREES.
* WHERE...SOUTHERN COOK COUNTY.
* WHEN...UNTIL 7 PM CDT THIS EVENING.
* IMPACTS...THE THREAT FOR HEAT RELATED ILLNESSES INCREASES
SIGNIFICANTLY DURING PROLONGED PERIODS OF HOT TEMPERATURES AND HIGH
HUMIDITY LEVELS.
* ADDITIONAL DETAILS...A COLD FRONT POSSIBLY ACCOMPANIED BY
THUNDERSTORMS WILL MOVE INLAND FROM LAKE MICHIGAN THIS AFTERNOON
AND EVENING LEADING TO RAPIDLY IMPROVING CONDITIONS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THE PROLONGED MAGNITUDE OF OBSERVED AND ANTICIPATED HEAT 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.
CONSIDER ALTERING OUTDOOR PLANS. IF YOU MUST SPEND AN EXTENDED TIME
OUTDOORS, WEAR LIGHTWEIGHT AND LOOSE FITTING CLOTHING. TAKE ACTION
WHEN YOU SEE SYMPTOMS OF HEAT EXHAUSTION AND HEAT STROKE.
ILZ010-019>021-023-032-033-039-106>108-INZ001-002-010-011-019-040115-
/O.CON.KLOT.HT.Y.0006.000000T0000Z-260904T0200Z/
LEE-LA SALLE-KENDALL-GRUNDY-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-
NORTHERN WILL-SOUTHERN WILL-EASTERN WILL-LAKE IN-PORTER-NEWTON-
JASPER-BENTON-
INCLUDING THE CITIES OF CHESTERTON, PONTIAC, OSWEGO, BOLINGBROOK,
JOLIET, PAXTON, GILMAN, COAL CITY, ROSELAWN, HAMMOND, MERRILLVILLE,
MARSEILLES, DIXON, MANHATTAN, BOURBONNAIS, BRADLEY, MOKENA, DEMOTTE,
CHANNAHON, VALPARAISO, WILMINGTON, OTTAWA, MINOOKA, FOWLER, GIBSON
CITY, WATSEKA, PLANO, MENDOTA, MORRIS, FAIRBURY, RENSSELAER,
KANKAKEE, DWIGHT, PLAINFIELD, GARY, KENTLAND, MOROCCO, CRETE,
PEOTONE, PORTAGE, STREATOR, LA SALLE, OXFORD, BEECHER, AND YORKVILLE
1014 AM CDT THU SEP 3 2026 /1114 AM EDT THU SEP 3 2026/
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM CDT /10 PM EDT/ THIS
EVENING...
* WHAT...HEAT INDEX VALUES OF 100 TO 105 EXPECTED. THIS IS THE THIRD
DAY IN A ROW WITH FORECAST OR OBSERVED HEAT INDICES ABOVE 100
DEGREES.
* WHERE...PORTIONS OF NORTHERN AND CENTRAL ILLINOIS NEAR AND SOUTH OF
I-80, AS WELL AS ALL OF NORTHWEST INDIANA.
* WHEN...UNTIL 9 PM CDT /10 PM EDT/ THIS EVENING.
* IMPACTS...HOT TEMPERATURES AND HIGH HUMIDITY MAY CAUSE HEAT
ILLNESSES ESPECIALLY AFTER SEVERAL DAYS OF DANGEROUS HEAT.
* ADDITIONAL DETAILS...A COLD FRONT POSSIBLY ACCOMPANIED BY
THUNDERSTORMS WILL MOVE INLAND FROM LAKE MICHIGAN THIS EVENING
LEADING TO RAPIDLY IMPROVING CONDITIONS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
CONSIDER ALTERING OUTDOOR PLANS. IF OUTDOORS FOR PROLONGED PERIODS OF
TIME, WEAR LIGHTWEIGHT AND LOOSE FITTING CLOTHING. TAKE ACTION WHEN
YOU SEE SYMPTOMS OF HEAT EXHAUSTION AND HEAT STROKE.
BIRK
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