423
FLUS43 KLOT 160900
HWOLOT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
400 AM CDT SAT AUG 16 2025
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-170900-
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-
400 AM CDT SAT AUG 16 2025 /500 AM EDT SAT AUG 16 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 ESPECIALLY SOUTH OF INTERSTATE 80.
ELEVATED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 DAMAGING WIND RISK...UP TO 70 MPH.
LEVEL 1 OF 5 LARGE HAIL RISK...UP TO 1 INCH IN DIAMETER.
ELEVATED FLOODING RISK.
DISCUSSION...
A COMPLEX OF THUNDERSTORMS IS EXPECTED TO MOVE ACROSS THE AREA
FROM NORTH TO SOUTH THIS AFTERNOON AND EVENING. DAMAGING WINDS ARE
THE PRIMARY THREAT, WHICH MAY LOCALLY EXCEED 70 MPH. ADDITIONAL
THUNDERSTORMS MAY DEVELOP OVERNIGHT WITH A THREAT FOR FLASH
FLOODING.
DAYS TWO THROUGH SEVEN
SUNDAY THROUGH FRIDAY.
MONDAY...
ELEVATED EXCESSIVE HEAT RISK.
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 SEVERE THUNDERSTORM RISK.
LIMITED FLOODING RISK.
TUESDAY...
LIMITED THUNDERSTORM RISK.
SPOTTER INFORMATION STATEMENT
SPOTTERS MAY BE NEEDED THIS AFTERNOON AND EVENING.
GENERAL STORM MOTION OF THE DAY:
MOVING TOWARD THE SOUTH AT 35 TO 40 MPH.
LMZ740>745-170900-
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-
400 AM CDT SAT AUG 16 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...
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 THUNDERSTORM WIND GUST RISK...UP TO 60 KNOTS.
DAYS TWO THROUGH SEVEN
SUNDAY THROUGH FRIDAY.
MONDAY...
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 SEVERE THUNDERSTORM RISK.
TUESDAY...
LIMITED THUNDERSTORM RISK.
BORCHARDT
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