810
FLUS43 KLOT 240911
HWOLOT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
411 AM CDT THU JUL 24 2025
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-250915-
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-
411 AM CDT THU JUL 24 2025 /511 AM EDT THU JUL 24 2025/
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 EXCESSIVE HEAT RISK.
ELEVATED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 DAMAGING WIND RISK...UP TO 60 MPH.
ELEVATED FLOODING RISK.
DISCUSSION...
DANGEROUS HEAT AND HUMIDITY WILL CONTINUE ACROSS MUCH OF
NORTHEASTERN IL AND NORTHWESTERN IN TODAY, WITH PEAK AFTERNOON
HEAT INDICES NEAR 105 DEGREES.
THUNDERSTORMS WILL REDEVELOP ACROSS NORTHERN ILLINOIS THIS
AFTERNOON, THEN GRADUALLY SAG SOUTH INTO THIS EVENING. THE
STRONGEST STORMS WILL BE CAPABLE OF PRODUCING LOCALLY DAMAGING
WIND GUSTS AND TORRENTIAL RAINFALL THAT COULD RESULT IN LOCALIZED
FLASH FLOODING.
DAYS TWO THROUGH SEVEN
FRIDAY THROUGH WEDNESDAY.
FRIDAY...
LIMITED THUNDERSTORM RISK.
LIMITED FLOODING RISK.
SATURDAY...
ELEVATED FLOODING RISK.
ELEVATED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 SEVERE THUNDERSTORM RISK.
SUNDAY...
LIMITED EXCESSIVE HEAT RISK.
MONDAY...
ELEVATED EXCESSIVE HEAT RISK.
TUESDAY...
LIMITED EXCESSIVE HEAT RISK.
DISCUSSION...
PERIODIC THUNDERSTORMS FRIDAY THROUGH SATURDAY WILL BRING THE
CHANCE FOR TORRENTIAL RAINFALL AND LOCALIZED FLOODING.
SPOTTER INFORMATION STATEMENT
SPOTTERS MAY BE NEEDED THIS AFTERNOON.
GENERAL STORM MOTION OF THE DAY:
MOVING TOWARD THE EAST AT 30 MPH
LMZ740>745-250915-
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-
411 AM CDT THU JUL 24 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...
ELEVATED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 THUNDERSTORM WIND GUST RISK...UP TO 50 KNOTS.
DAYS TWO THROUGH SEVEN
FRIDAY THROUGH WEDNESDAY.
FRIDAY...
LIMITED THUNDERSTORM RISK.
SATURDAY...
ELEVATED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 SEVERE THUNDERSTORM RISK.
KLUBER/KJB
VISIT US AT WWW.WEATHER.GOV/CHICAGO
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page