890
FLUS43 KLOT 110844
HWOLOT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
344 AM CDT TUE AUG 11 2026
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-120845-
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-
344 AM CDT TUE AUG 11 2026 /444 AM EDT TUE AUG 11 2026/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
ILLINOIS...NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
DAY ONE
TODAY AND TONIGHT.
WEATHER HAZARDS EXPECTED...
SIGNIFICANT THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 TORNADO RISK.
LEVEL 3 OF 5 DAMAGING WIND RISK...UP TO 80 MPH.
ELEVATED FLOODING RISK.
DISCUSSION...
SCATTERED THUNDERSTORMS EARLY THIS MORNING WILL PRESENT A
LOCALIZED RISK OF SEVERE WEATHER, PRIMARILY DAMAGING WINDS. A
COMPLEX OF THUNDERSTORMS MAY THEN MOVE ACROSS THE AREA FROM MID-
MORNING INTO EARLY THIS AFTERNOON. IF THIS COMPLEX MATERIALIZES,
IT WILL LIKELY BE SEVERE WITH DAMAGING WIND GUSTS AS HIGH AS 80
MPH. IN ADDITION, ANY OF THESE THUNDERSTORMS WILL BE CAPABLE OF
PRODUCING TORRENTIAL DOWNPOURS WHICH MAY LEAD TO LOCALIZED
FLOODING.
DAYS TWO THROUGH SEVEN
WEDNESDAY THROUGH MONDAY.
WEDNESDAY AND THURSDAY...
ELEVATED FLOODING RISK.
ELEVATED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 SEVERE THUNDERSTORM RISK.
FRIDAY...
ELEVATED FLOODING RISK.
LIMITED THUNDERSTORM RISK.
SATURDAY...
LIMITED FLOODING RISK.
LIMITED THUNDERSTORM RISK.
SUNDAY...
LIMITED THUNDERSTORM RISK.
DISCUSSION...
AN ACTIVE AND POTENTIALLY STORMY WEATHER PATTERN WILL PERSIST
THROUGH THE END OF THE WEEK, WITH ADDITIONAL ROUNDS OF
THUNDERSTORMS POSSIBLE AND AN ATTENDANT RISK OF SEVERE WEATHER
AND FLASH FLOODING.
SPOTTER INFORMATION STATEMENT
SPOTTERS WILL LIKELY BE NEEDED THIS MORNING THROUGH MID-
AFTERNOON.
GENERAL STORM MOTION OF THE DAY:
MOVING TOWARD THE EAST-SOUTHEAST AT 30 TO 40 MPH. IF A BOWING
COMPLEX DEVELOPS, IT COULD MOVE EAST AT 50 TO 65 MPH.
LMZ740>745-120845-
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-
344 AM CDT TUE AUG 11 2026
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...
SIGNIFICANT THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 3 OF 5 THUNDERSTORM WIND GUST RISK...UP TO 70 KNOTS.
DAYS TWO THROUGH SEVEN
WEDNESDAY THROUGH MONDAY.
WEDNESDAY...
LIMITED THUNDERSTORM RISK.
THURSDAY AND FRIDAY...
HAZARDOUS CONDITIONS FOR SMALL CRAFT ARE LIKELY.
LIMITED THUNDERSTORM RISK.
SATURDAY AND SUNDAY...
LIMITED THUNDERSTORM RISK.
RATZER
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