829  
FLUS43 KLOT 210124 AAA  
HWOLOT  
 
HAZARDOUS WEATHER OUTLOOK...UPDATED  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
824 PM CDT SUN JUL 20 2025  
 
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-  
010-011-019-220130-  
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-  
824 PM CDT SUN JUL 20 2025 /924 PM EDT SUN JUL 20 2025/  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL  
ILLINOIS...NORTHEAST ILLINOIS AND NORTHWEST INDIANA.  
   
DAY ONE  
TONIGHT.  
 
WEATHER HAZARDS EXPECTED...  
 
LIMITED THUNDERSTORM RISK SOUTH OF US ROUTE 24.  
HIGH SWIM RISK LAKE MICHIGAN BEACHES.  
 
DISCUSSION...  
 
ISOLATED SHOWERS AND THUNDERSTORMS ARE POSSIBLE OVERNIGHT,  
MAINLY SOUTH OF US ROUTE 24. NO SEVERE WEATHER IS EXPECTED.  
 
DANGEROUS SWIMMING CONDITIONS CONTINUE FOR THE ILLINOIS AND  
INDIANA BEACHES OF LAKE MICHIGAN THROUGH TONIGHT.  
   
DAYS TWO THROUGH SEVEN  
MONDAY THROUGH SATURDAY.  
 
MONDAY...  
LIMITED THUNDERSTORM RISK SOUTH OF I-80.  
HIGH SWIM RISK LAKE MICHIGAN BEACHES IN THE MORNING.  
WEDNESDAY...  
SIGNIFICANT EXCESSIVE HEAT RISK.  
THURSDAY NIGHT...  
LIMITED THUNDERSTORM RISK.  
ELEVATED EXCESSIVE HEAT RISK.  
FRIDAY AND SATURDAY...  
LIMITED THUNDERSTORM RISK.  
LIMITED EXCESSIVE HEAT RISK.  
 
DISCUSSION...  
 
DANGEROUS HEAT AND HUMIDITY IS EXPECTED WEDNESDAY AND THURSDAY,  
AND POSSIBLY STRETCHING INTO FRIDAY.  
   
SPOTTER INFORMATION STATEMENT  
 
SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.  
 
GENERAL STORM MOTION OF THE DAY:  
 
MOVING TOWARD THE EAST-SOUTHEAST AT AROUND 20 MPH.  
 
 
 
LMZ740>745-220130-  
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-  
824 PM CDT SUN JUL 20 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...  
 
HAZARDOUS CONDITIONS FOR SMALL CRAFT.  
   
DAYS TWO THROUGH SEVEN  
MONDAY THROUGH SATURDAY.  
 
MONDAY...  
HAZARDOUS CONDITIONS FOR SMALL CRAFT ARE LIKELY.  
THURSDAY THROUGH SATURDAY...  
LIMITED THUNDERSTORM RISK.  
 
 
 
RATZER  
 
VISIT US AT WWW.WEATHER.GOV/CHICAGO  
CLICK HERE TO GO TO PREVIOUS BULLETINS.
The Nexlab IL Page
The Nexlab IN Page
Main Text Page