364
FLUS43 KLOT 152039
HWOLOT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
339 PM CDT THU MAY 15 2025
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-162045-
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-
339 PM CDT THU MAY 15 2025 /439 PM EDT THU MAY 15 2025/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
ILLINOIS...NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
DAY ONE
TONIGHT.
WEATHER HAZARDS EXPECTED...
ELEVATED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 3 OF 5 LARGE HAIL RISK...UP TO 3 INCH DIAMETER.
LEVEL 3 OF 5 DAMAGING WIND RISK...UP TO 80 MPH.
LEVEL 3 OF 5 TORNADO RISK.
DISCUSSION...
ISOLATED TO SCATTERED SEVERE THUNDERSTORMS WILL DEVELOP NEAR THE
I-39 CORRIDOR LATE THIS AFTERNOON, THEN SHIFT EASTWARD ACROSS
NORTHEASTERN ILLINOIS AND NORTHWESTERLY INDIANA EARLY THIS
EVENING. ANY STORMS THAT DEVELOP WILL BE CAPABLE OF PRODUCING
DESTRUCTIVE HAIL TO 3 INCHES IN DIAMETER AND DAMAGING WINDS UP TO
80 MPH. A TORNADO THREAT MAY DEVELOP AS WELL EARLY THIS EVENING
WITH THE MOST INTENSE STORMS ACROSS FAR EASTERN ILLINOIS AND
NORTHWESTERN IN.
DAYS TWO THROUGH SEVEN
FRIDAY THROUGH WEDNESDAY.
FRIDAY...
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 2 OF 5 SEVERE THUNDERSTORM RISK.
ELEVATED NON THUNDERSTORM WIND RISK.
SIGNIFICANT FIRE WEATHER RISK.
MONDAY...
LIMITED THUNDERSTORM RISK.
WEDNESDAY...
LIMITED THUNDERSTORM RISK.
DISCUSSION...
CRITICAL FIRE DANGER MAY DEVELOP FRIDAY AFTERNOON ACROSS
NORTHWESTERN ILLINOIS DUE TO A COMBINATION OF STRONG WINDS UP TO
45 MPH AND DRY CONDITIONS. IN ADDITION, THUNDERSTORMS MAY DEVELOP
LATE FRIDAY AFTERNOON AND EVENING WITH A THREAT FOR DAMAGING WINDS
AND HAIL.
SPOTTER INFORMATION STATEMENT
SPOTTERS WILL LIKELY BE NEEDED THROUGH EARLY THIS EVENING.
GENERAL STORM MOTION OF THE DAY:
MOVING TOWARD THE EAST NORTHEAST AT 40 TO 50 MPH.
LMZ740>745-162045-
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-
339 PM CDT THU MAY 15 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
TONIGHT.
WEATHER HAZARDS EXPECTED...
HAZARDOUS CONDITIONS FOR SMALL CRAFT.
ELEVATED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 3 OF 5 HAIL RISK...UP TO 3 INCH DIAMETER.
LEVEL 3 OF 5 THUNDERSTORM WIND GUST RISK...UP TO 70 KT.
THUNDERSTORM WATERSPOUT RISK
DAYS TWO THROUGH SEVEN
FRIDAY THROUGH WEDNESDAY.
FRIDAY...
GALE FORCE WINDS.
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:
LEVEL 1 OF 5 SEVERE THUNDERSTORM RISK.
SATURDAY THROUGH WEDNESDAY...
HAZARDOUS CONDITIONS FOR SMALL CRAFT ARE LIKELY.
KJB
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