029  
FLUS43 KLOT 240916  
HWOLOT  
 
HAZARDOUS WEATHER OUTLOOK  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
416 AM CDT SUN JUN 24 2018  
 
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-  
250930-  
WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DEKALB-KANE-DUPAGE-COOK-  
LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-  
LAKE IN-PORTER-NEWTON-JASPER-BENTON-  
416 AM CDT SUN JUN 24 2018 /516 AM EDT SUN JUN 24 2018/  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL  
ILLINOIS...NORTHEAST ILLINOIS AND NORTHWEST INDIANA.  
   
DAY ONE
 
TODAY AND TONIGHT.  
 
MANY AREA RIVERS WILL REMAIN IN FLOOD.  
   
DAYS TWO THROUGH SEVEN
 
MONDAY THROUGH SATURDAY.  
 
MONDAY NIGHT...  
LIMITED SEVERE THUNDERSTORM RISK.  
ELEVATED FLOODING RISK.  
HIGH SWIM RISK ILLINOIS SHORES.  
TUESDAY...  
ELEVATED SEVERE THUNDERSTORM RISK LATE AFTERNOON AND EVENING.  
ELEVATED FLOODING RISK.  
HIGH SWIM RISK EARLY ILLINOIS SHORES.  
WEDNESDAY...  
LIMITED THUNDERSTORM RISK EARLY.  
THURSDAY...  
LIMITED THUNDERSTORM RISK.  
LIMITED EXCESSIVE HEAT RISK.  
FRIDAY...  
ELEVATED EXCESSIVE HEAT RISK.  
SATURDAY...  
LIMITED THUNDERSTORM RISK.  
ELEVATED EXCESSIVE HEAT RISK.  
 
DISCUSSION:  
 
TWO DISTINCT ROUNDS OF THUNDERSTORMS WILL BE POSSIBLE. THE FIRST  
ROUND WILL BE MONDAY NIGHT INTO EARLY TUESDAY. SOME OF THESE  
STORMS COULD BE STRONG ACROSS WESTERN ILLINOIS. VERY HEAVY  
RAINFALL WILL ALSO BE POSSIBLE WITH THESE STORMS. A SECOND ROUND  
OF THUNDERSTORMS WILL THEN BE POSSIBLE LATE TUESDAY AFTERNOON AND  
EVENING. WHILE THIS SECOND ROUND OF STORMS WILL ALSO BE CAPABLE  
OF PRODUCING HEAVY RAIN, THERE IS ALSO AN INCREASED THREAT THAT  
SOME OF THESE STORMS WILL BE CAPABLE OF BEING SEVERE, WITH STRONG  
DAMAGING WINDS AND POSSIBLY SOME HAIL.  
 
GIVEN THE WET CONDITIONS OF LATE AND THE POSSIBILITY FOR MORE  
HEAVY RAINFALL, LOCALIZED FLASH FLOODING WILL BE POSSIBLE MONDAY  
NIGHT THROUGH TUESDAY NIGHT.  
 
TEMPERATURES AND HUMIDITY LEVELS WILL BE ON THE INCREASE LATER IN  
THE WEEK. THIS COULD RESULT IN HEAT INDICES CLIMBING WELL INTO  
THE 90S BY THURSDAY AND TO 100 TO 105 DEGREES FRIDAY AND SATURDAY.  
 
IN ADDITION...MANY AREA RIVERS WILL REMAIN IN FLOOD INTO EARLY  
THIS WEEK...THOUGH ADDITIONAL RISES MAY BE POSSIBLE TUESDAY INTO  
WEDNESDAY.  
 
   
SPOTTER INFORMATION STATEMENT
 
 
SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.  
 

 
 
LMZ740>745-250930-  
WINTHROP HARBOR TO WILMETTE HARBOR-  
WILMETTE HARBOR TO NORTHERLY ISLAND-  
NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY-  
GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY-  
416 AM CDT SUN JUN 24 2018  
 
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
 
MONDAY THROUGH SATURDAY.  
 
MONDAY...  
ELEVATED THUNDERSTORM RISK.  
TUESDAY...  
ELEVATED SEVERE THUNDERSTORM RISK.  
WEDNESDAY AND THURSDAY...  
LIMITED THUNDERSTORM RISK.  
SATURDAY...  
LIMITED THUNDERSTORM RISK.  
 

 
 
LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-  
870-872-874-876-878-250930-  
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM  
OFFSHORE TO MID LAKE-  
LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM  
OFFSHORE TO MID LAKE-  
LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE  
MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH  
FOX ISLAND 5 NM OFFSHORE-  
LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO  
MID LAKE-  
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO  
MID LAKE-  
LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI-  
LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO  
MID LAKE-  
LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO  
MID LAKE-  
LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE  
TO MID LAKE-  
LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM  
OFFSHORE TO MID LAKE-  
LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM  
OFFSHORE TO MID LAKE-  
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM  
OFFSHORE TO MID LAKE-  
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM  
OFFSHORE TO MID LAKE-  
LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM  
OFFSHORE TO MID LAKE-  
LAKE MICHIGAN HOLLAND TO WHITEHALL MI 5 NM OFF SHORE TO MID-  
LINE OF LAKE-  
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID  
LAKE-  
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO  
MID LAKE-  
LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID  
LAKE-  
LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID  
LAKE-  
LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO  
MID LAKE-  
416 AM CDT SUN JUN 24 2018  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE OPEN WATERS  
OF LAKE MICHIGAN.  
   
DAY ONE
 
TODAY AND TONIGHT.  
 
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.  
   
DAYS TWO THROUGH SEVEN
 
MONDAY THROUGH SATURDAY.  
 
MONDAY...  
ELEVATED THUNDERSTORM RISK.  
TUESDAY...  
ELEVATED SEVERE THUNDERSTORM RISK.  
WEDNESDAY...  
ELEVATED THUNDERSTORM RISK.  
THURSDAY THROUGH SATURDAY...  
LIMITED THUNDERSTORM RISK.  
 

 
 
KJB  
 
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