295  
FLUS43 KLOT 242027  
HWOLOT  
 
HAZARDOUS WEATHER OUTLOOK  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
327 PM CDT THU JUL 24 2025  
 
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-  
010-011-019-252030-  
WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-  
LA SALLE-KENDALL-GRUNDY-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-  
NORTHERN COOK-CENTRAL COOK-SOUTHERN COOK-NORTHERN WILL-  
SOUTHERN WILL-EASTERN WILL-LAKE IN-PORTER-NEWTON-JASPER-BENTON-  
327 PM CDT THU JUL 24 2025 /427 PM EDT THU JUL 24 2025/  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL  
ILLINOIS...NORTHEAST ILLINOIS AND NORTHWEST INDIANA.  
   
DAY ONE
 
TONIGHT.  
 
WEATHER HAZARDS EXPECTED...  
 
ELEVATED THUNDERSTORM RISK...WITH AN ASSOCIATED:  
LEVEL 2 OF 5 DAMAGING WIND RISK...UP TO 70 MPH.  
ELEVATED FLOODING RISK.  
ELEVATED EXCESSIVE HEAT RISK SOUTH OF I-80.  
 
DISCUSSION...  
 
HOT AND HUMID CONDITIONS ARE EXPECTED THIS AFTERNOON WITH PEAK  
HEAT INDICES OF 100 TO 110 DEGREES LINGERING SOUTH OF I-80 AHEAD  
OF THUNDERSTORMS. ONCE STORMS PASS, THE HEAT THREAT WILL END.  
 
STRONG TO SEVERE THUNDERSTORMS WILL OCCUR THIS AFTERNOON INTO  
THE EARLY EVENING, MAINLY NEAR AND SOUTH OF I-80, INCLUDING  
NORTHWEST INDIANA. THE PRIMARY SEVERE RISK WILL BE LOCALLY  
DAMAGING WINDS TO 70 MPH. TORRENTIAL RAINFALL MAY LEAD TO ISOLATED  
INSTANCES OF FLOODING.  
 
ADDITIONAL STORMS ARE POSSIBLE THIS EVENING, AND PARTICULARLY LATE  
TONIGHT INTO FRIDAY MORNING. LOCALLY HEAVY RAINFALL MAY ONCE AGAIN  
LEAD TO A THREAT FOR ISOLATED FLASH FLOODING.  
   
DAYS TWO THROUGH SEVEN
 
FRIDAY THROUGH WEDNESDAY.  
 
FRIDAY...  
ELEVATED FLOODING RISK.  
LIMITED THUNDERSTORM RISK.  
SATURDAY...  
LIMITED FLOODING RISK.  
ELEVATED THUNDERSTORM RISK...WITH AN ASSOCIATED:  
LEVEL 1 OF 5 SEVERE THUNDERSTORM RISK.  
SUNDAY...  
LIMITED THUNDERSTORM RISK.  
LIMITED EXCESSIVE HEAT RISK.  
MONDAY...  
LIMITED THUNDERSTORM RISK.  
ELEVATED EXCESSIVE HEAT RISK.  
 
DISCUSSION...  
 
PERIODIC THUNDERSTORMS FRIDAY THROUGH SATURDAY WILL BRING THE  
CHANCE FOR TORRENTIAL RAINFALL AND LOCALIZED FLOODING,  
PARTICULARLY LATE FRIDAY NIGHT INTO SATURDAY MORNING.  
 
HEAT AND HUMIDITY MAY ONCE AGAIN BUILD TO DANGEROUS LEVELS AT  
TIMES SUNDAY THROUGH TUESDAY.  
   
SPOTTER INFORMATION STATEMENT
 
 
SPOTTERS WILL BE NEEDED THIS AFTERNOON, MAINLY SOUTH OF I-80.  
 
GENERAL STORM MOTION OF THE DAY:  
 
MOVING TOWARD THE EAST-SOUTHEAST AT 30 TO 35 MPH.  
 

 
 
LMZ740>745-252030-  
WINTHROP HARBOR TO WILMETTE HARBOR IL-  
WILMETTE HARBOR TO NORTHERLY ISLAND IL-  
NORTHERLY ISLAND TO CALUMET HARBOR IL-  
CALUMET HARBOR IL TO GARY IN-GARY TO BURNS HARBOR IN-  
BURNS HARBOR TO MICHIGAN CITY IN-  
327 PM CDT THU JUL 24 2025  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE ILLINOIS  
NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE  
WATERS OF LAKE MICHIGAN.  
   
DAY ONE
 
TONIGHT.  
 
WEATHER HAZARDS EXPECTED...  
 
ELEVATED THUNDERSTORM RISK...WITH AN ASSOCIATED:  
LEVEL 2 OF 5 THUNDERSTORM WIND GUST RISK...UP TO 60 KNOTS.  
   
DAYS TWO THROUGH SEVEN
 
FRIDAY THROUGH WEDNESDAY.  
 
FRIDAY...  
LIMITED THUNDERSTORM RISK.  
SATURDAY...  
ELEVATED THUNDERSTORM RISK...WITH AN ASSOCIATED:  
LEVEL 1 OF 5 SEVERE THUNDERSTORM RISK.  
WEDNESDAY...  
LIMITED THUNDERSTORM RISK.  
 

 
 
CARLAW  
 
VISIT US AT WWW.WEATHER.GOV/CHICAGO  
 
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