981  
FLUS43 KLOT 291715  
HWOLOT  
 
HAZARDOUS WEATHER OUTLOOK  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
1215 PM CDT SUN JUN 29 2025  
 
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-  
010-011-019-301715-  
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-  
1215 PM CDT SUN JUN 29 2025 /115 PM EDT SUN JUN 29 2025/  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL  
ILLINOIS...NORTHEAST ILLINOIS AND NORTHWEST INDIANA.  
   
DAY ONE
 
THIS AFTERNOON AND TONIGHT.  
 
WEATHER HAZARDS EXPECTED...  
 
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:  
LEVEL 1 OF 5 DAMAGING WIND RISK...UP TO 50 TO 60 MPH.  
LIMITED EXCESSIVE HEAT RISK.  
 
DISCUSSION...  
 
ISOLATED THUNDERSTORMS WILL CONTINUE TO DEVELOP THROUGH EARLY  
EVENING, PARTICULARLY NEAR LAKE MICHIGAN AND SOUTH OF THE KANKAKEE  
RIVER VALLEY. ISOLATED TO PERHAPS WIDELY SCATTERED THUNDERSTORMS  
ARE THEN POSSIBLE IN THE LATE EVENING AND OVERNIGHT. THE STRONGEST  
THUNDERSTORMS THROUGH TONIGHT MAY BE CAPABLE OF PRODUCING  
LOCALIZED STRONG TO DAMAGING DOWNBURST WINDS.  
 
HEAT INDICES THIS AFTERNOON AWAY FROM THE ILLINOIS SHORE WILL TOP  
OUT AROUND 100 DEGREES.  
   
DAYS TWO THROUGH SEVEN
 
MONDAY THROUGH SATURDAY.  
 
MONDAY...  
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:  
LEVEL 1 OF 5 SEVERE THUNDERSTORM RISK.  
SATURDAY...  
LIMITED THUNDERSTORM RISK.  
LIMITED EXCESSIVE HEAT RISK.  
   
SPOTTER INFORMATION STATEMENT
 
 
SPOTTER ACTIVATION IS UNLIKELY THROUGH TONIGHT, BUT ANY REPORTS  
ARE APPRECIATED.  
 
GENERAL STORM MOTION OF THE DAY:  
 
MOVING TOWARD THE NORTHEAST AT 10 MPH.  
 

 
 
LMZ740>745-301715-  
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-  
1215 PM CDT SUN JUN 29 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.  
 
WEATHER HAZARDS EXPECTED...  
 
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:  
LEVEL 1 OF 5 THUNDERSTORM WIND GUST RISK...UP TO 40 TO 50 KNOTS.  
   
DAYS TWO THROUGH SEVEN
 
MONDAY THROUGH SATURDAY.  
 
MONDAY...  
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:  
LEVEL 1 OF 5 SEVERE THUNDERSTORM RISK. SATURDAY... LIMITED  
THUNDERSTORM RISK.  
 

 
 
KLUBER  
 
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