420
FLUS43 KLOT 160817
HWOLOT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
317 AM CDT TUE JUN 16 2026
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-170830-
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-
317 AM CDT TUE JUN 16 2026 /417 AM EDT TUE JUN 16 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...
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 DAMAGING WIND RISK...UP TO 60 MPH.
LEVEL 1 OF 5 LARGE HAIL RISK...UP TO HALF DOLLAR SIZE.
DISCUSSION...
ISOLATED, NON-SEVERE, THUNDERSTORMS ARE EXPECTED THIS MORNING.
THEN SCATTERED THUNDERSTORMS ARE LIKELY TO REDEVELOP ALONG A COLD
FRONT OVER FAR EASTERN ILLINOIS INTO NORTHWEST INDIANA DURING THE
EARLY TO MID AFTERNOON, ESPECIALLY NEAR AND EAST OF INTERSTATE
55. A COUPLE OF THESE STORMS COULD BECOME SEVERE CAPABLE OF
PRODUCING LARGE HAIL AND DAMAGING WINDS.
DAYS TWO THROUGH SEVEN
WEDNESDAY THROUGH MONDAY.
WEDNESDAY...
ELEVATED FLOODING RISK.
SIGNIFICANT THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 4 OF 5 SEVERE THUNDERSTORM RISK.
HIGH SWIM RISK ILLINOIS LAKE MICHIGAN BEACHES.
THURSDAY...
HIGH SWIM RISK INDIANA LAKE MICHIGAN BEACHES.
SATURDAY AND SUNDAY...
LIMITED THUNDERSTORM RISK.
DISCUSSION...
TWO ROUNDS OF POTENTIALLY SEVERE THUNDERSTORMS ARE EXPECTED
WEDNESDAY.
THE FIRST DURING THE MORNING INTO THE EARLY AFTERNOON. SOME OF
THOSE THUNDERSTORMS COULD BE SEVERE CAPABLE OF DAMAGING WINDS UP
TO 75 MPH AND LARGE HAIL UP TO GOLF BALL SIZED. THE GREATEST
SEVERE RISK WITH THIS ACTIVITY IS EXPECTED TO BE NEAR AND SOUTH OF
I-80.
A SECOND ROUND OF POTENTIALLY DANGEROUS SEVERE THUNDERSTORMS IS
EXPECTED LATE IN THE AFTERNOON INTO THE EARLY EVENING WEDNESDAY.
THESE STORMS COULD PRODUCE TORNADOES ANYWHERE ACROSS NORTHERN
ILLINOIS AND NORTHWEST INDIANA, BUT THE TORNADO THREAT LOOKS
PARTICULARLY WORRISOME SOUTH OF I-80 AND ACROSS NORTHWEST
INDIANA. IT IS IN THOSE AREAS THAT THE THREAT OF LONG TRACKED AND
PARTICULARLY DAMAGING TORNADOES APPEARS HIGHEST. IN ADDITION TO
THE TORNADO THREAT, THUNDERSTORMS LATE WEDNESDAY AFTERNOON AND
EVENING WILL BE CAPABLE OF PRODUCING WIDESPREAD DAMAGING WINDS,
POTENTIALLY IN EXCESS OF 80 MPH IN AREAS THAT GET HIT THE HARDEST.
FINALLY, THUNDERSTORMS WEDNESDAY WILL CAPABLE OF PRODUCING
TORRENTIAL RAINFALL THAT COULD RESULT IN AREAS OF FLASH FLOODING
WEDNESDAY MORNING THROUGH EARLY WEDNESDAY EVENING.
SPOTTER INFORMATION STATEMENT
SPOTTERS MAY BE NEEDED EAST OF I-55 THIS AFTERNOON, AND WILL
LIKELY BE NEEDED WEDNESDAY.
GENERAL STORM MOTION OF THE DAY:
MOVING TOWARD THE EAST AT 25 MPH.
LMZ740>745-170830-
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-
317 AM CDT TUE JUN 16 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.
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 THUNDERSTORM WIND GUST RISK...UP TO 50 KNOTS.
LEVEL 1 OF 5 HAIL RISK...UP TO HALF DOLLAR SIZE.
DAYS TWO THROUGH SEVEN
WEDNESDAY THROUGH MONDAY.
WEDNESDAY...
HAZARDOUS CONDITIONS FOR SMALL CRAFT ARE LIKELY.
SIGNIFICANT THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 3 OF 5 SEVERE THUNDERSTORM RISK.
THURSDAY...
HAZARDOUS CONDITIONS FOR SMALL CRAFT ARE LIKELY.
SATURDAY AND SUNDAY...
LIMITED THUNDERSTORM RISK.
- IZZI
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