685
FLUS43 KLOT 201715
HWOLOT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1215 PM CDT SUN JUL 20 2025
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-211715-
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 JUL 20 2025 /115 PM EDT SUN JUL 20 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 60 MPH.
ELEVATED FLOODING RISK.
HIGH SWIM RISK LAKE MICHIGAN BEACHES IN ILLINOIS.
DISCUSSION...
THERE IS A CHANCE FOR THUNDERSTORMS THIS AFTERNOON INTO THIS
EVENING, MAINLY SOUTH OF A PONTIAC TO RENSSELAER LINE. THE MAIN
THREAT FROM THESE STORMS WILL BE DAMAGING WINDS AND VERY HEAVY
RAIN.
ANOTHER ROUND OF THUNDERSTORMS WITH AN AXIS OF TORRENTIAL
RAINFALL AND POTENTIAL FLOODING ACROSS CENTRAL ILLINOIS COULD
REACH AS FAR NORTH AS A PONTIAC TO FOWLER LINE TONIGHT.
DANGEROUS SWIMMING CONDITIONS CONTINUE FOR THE ILLINOIS BEACHES
OF LAKE MICHIGAN THROUGH TONIGHT.
DAYS TWO THROUGH SEVEN
MONDAY THROUGH SATURDAY.
MONDAY...
LIMITED THUNDERSTORM RISK.
WEDNESDAY AND THURSDAY...
ELEVATED EXCESSIVE HEAT RISK.
THURSDAY NIGHT...
LIMITED THUNDERSTORM RISK.
FRIDAY...
LIMITED THUNDERSTORM RISK.
LIMITED EXCESSIVE HEAT RISK.
SATURDAY...
LIMITED THUNDERSTORM RISK.
DISCUSSION...
DANGEROUS HEAT AND HUMIDITY IS EXPECTED WEDNESDAY AND THURSDAY.
SPOTTER INFORMATION STATEMENT
SPOTTERS MAY BE NEEDED LATE THIS AFTERNOON TOWARD CENTRAL
ILLINOIS.
GENERAL STORM MOTION OF THE DAY:
MOVING TOWARD THE SOUTHEAST AT 40 MPH.
LMZ740>745-211715-
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 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
THIS AFTERNOON AND TONIGHT.
WEATHER HAZARDS EXPECTED...
LIMITED THUNDERSTORM RISK.
DAYS TWO THROUGH SEVEN
MONDAY THROUGH SATURDAY.
THURSDAY THROUGH SATURDAY...
LIMITED THUNDERSTORM RISK.
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