526
FLUS43 KLOT 190912
HWOLOT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
412 AM CDT SAT SEP 19 2026
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-200915-
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-
412 AM CDT SAT SEP 19 2026 /512 AM EDT SAT SEP 19 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...
ELEVATED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 DAMAGING WIND RISK...UP TO 60 MPH.
SIGNIFICANT FLOODING RISK.
HIGH SWIM RISK ILLINOIS LAKE MICHIGAN BEACHES.
DISCUSSION...
THUNDERSTORMS WITH HEAVY RAIN WILL MOVE ACROSS PARTS OF NORTHERN
ILLINOIS AND NORTHWEST INDIANA THIS MORNING WITH LOCALIZED FLASH
FLOODING POSSIBLE. ADDITIONAL THUNDERSTORMS WITH HEAVY RAIN ARE
POSSIBLE LATE THIS EVENING AND OVERNIGHT WITH LOCALIZED FLASH
FLOODING ALSO POSSIBLE. A FEW OF THE STORMS MAY BE STRONG TO
LOCALLY SEVERE, MAINLY SOUTH OF THE ILLINOIS AND KANKAKEE RIVERS.
HIGH WAVES WILL CREATE DANGEROUS SWIMMING CONDITIONS AT LAKE
MICHIGAN BEACHES IN NORTHEAST ILLINOIS.
DAYS TWO THROUGH SEVEN
SUNDAY THROUGH FRIDAY.
SUNDAY...
ELEVATED FLOODING RISK.
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 SEVERE THUNDERSTORM RISK.
HIGH SWIM RISK LAKE MICHIGAN BEACHES.
MONDAY THROUGH WEDNESDAY...
HIGH SWIM RISK LAKE MICHIGAN BEACHES.
DISCUSSION...
PERIODS OF HEAVY RAIN AND SCATTERED THUNDERSTORMS WILL BE
POSSIBLE SUNDAY WITH A CONTINUED LOCALIZED FLASH FLOODING RISK.
PERSISTENT NORTHEAST WINDS WILL MAINTAIN HIGH WAVES AND
DANGEROUS SWIMMING CONDITIONS AT LAKE MICHIGAN BEACHES IN
NORTHEAST ILLINOIS AND NORTHWEST INDIANA THROUGH THE MIDDLE OF
NEXT WEEK.
SPOTTER INFORMATION STATEMENT
SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.
GENERAL STORM MOTION OF THE DAY:
MOVING TOWARD THE EAST SOUTHEAST AT 25 TO 35 MPH.
LMZ740>745-200915-
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-
412 AM CDT SAT SEP 19 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...
HAZARDOUS CONDITIONS FOR SMALL CRAFT.
ELEVATED THUNDERSTORM RISK.
DAYS TWO THROUGH SEVEN
SUNDAY THROUGH FRIDAY.
SUNDAY...
HAZARDOUS CONDITIONS FOR SMALL CRAFT ARE LIKELY.
LIMITED THUNDERSTORM RISK.
MONDAY THROUGH WEDNESDAY...
HAZARDOUS CONDITIONS FOR SMALL CRAFT ARE LIKELY.
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