717  
FLUS43 KLOT 211522  
HWOLOT  
 
HAZARDOUS WEATHER OUTLOOK  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
1022 AM CDT MON JUL 21 2025  
 
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-  
010-011-019-221530-  
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-  
1022 AM CDT MON JUL 21 2025 /1122 AM EDT MON JUL 21 2025/  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL  
ILLINOIS...NORTHEAST ILLINOIS AND NORTHWEST INDIANA.  
   
DAY ONE
 
TODAY AND TONIGHT.  
 
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.  
   
DAYS TWO THROUGH SEVEN
 
TUESDAY THROUGH SUNDAY.  
 
WEDNESDAY AND THURSDAY...  
SIGNIFICANT EXCESSIVE HEAT RISK.  
THURSDAY NIGHT...  
LIMITED THUNDERSTORM RISK.  
FRIDAY...  
LIMITED FLOODING RISK.  
LIMITED THUNDERSTORM RISK.  
ELEVATED EXCESSIVE HEAT RISK.  
SATURDAY...  
LIMITED THUNDERSTORM RISK.  
LIMITED EXCESSIVE HEAT RISK.  
 
DISCUSSION...  
 
DANGEROUS HEAT AND HUMIDITY WITH HEAT INDEX VALUES UP TO AROUND  
110F ARE EXPECTED WEDNESDAY AND THURSDAY.  
   
SPOTTER INFORMATION STATEMENT
 
 
SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.  
 

 
 
LMZ740>745-221530-  
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-  
1022 AM CDT MON JUL 21 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
 
TODAY AND TONIGHT.  
 
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.  
   
DAYS TWO THROUGH SEVEN
 
TUESDAY THROUGH SUNDAY.  
 
THURSDAY NIGHT THROUGH SATURDAY...  
LIMITED THUNDERSTORM RISK.  
 

 
 
OGOREK  
 
VISIT US AT WWW.WEATHER.GOV/CHICAGO  
 
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