931
WHUS53 KLOT 180204
SMWLOT
LMZ741>745-779-180400-
/O.NEW.KLOT.MA.W.0028.260418T0204Z-260418T0400Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE
904 PM CDT FRI APR 17 2026
THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A
* SPECIAL MARINE WARNING FOR...
NEARSHORE WATERS FROM WILMETTE HARBOR TO CALUMET HARBOR...
NEARSHORE WATERS FROM CALUMET HARBOR TO MICHIGAN CITY...
OPEN WATERS FROM WILMETTE HARBOR TO MICHIGAN CITY OUT TO MID
LAKE...
* UNTIL 1100 PM CDT.
* AT 904 PM CDT, SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
WATERSPOUTS WERE LOCATED ALONG A LINE EXTENDING FROM 13 NM WEST OF
ELGIN TO 9 NM SOUTHWEST OF AURORA TO 29 NM SOUTHWEST OF JOLIET,
MOVING EAST AT 40 KNOTS.
HAZARD...WATERSPOUTS AND WIND GUSTS IN EXCESS OF 65 KNOTS.
SOURCE...RADAR.
IMPACT...WATERSPOUTS CAN EASILY OVERTURN BOATS AND CREATE LOCALLY
HAZARDOUS SEAS. BOATS COULD SUFFER SIGNIFICANT STRUCTURAL
DAMAGE IN HIGH WINDS. SMALL CRAFT COULD CAPSIZE IN
SUDDENLY HIGHER WAVES.
* LOCATIONS IMPACTED INCLUDE...
CALUMET HARBOR, INDIANA HARBOR, 31ST STREET HARBOR, MONROE HARBOR,
BURNS HARBOR, MARINA SHORES AT DUNE HARBOR, BURNHAM HARBOR, 59TH
STREET MARINA, HAMMOND MARINA, JACKSON PARK HARBOR, AND DUSABLE
HARBOR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT FOR NORTHEASTERN
ILLINOIS...NORTHWESTERN INDIANA...AND THE ADJACENT WATERS OF LAKE
MICHIGAN.
MOVE TO SAFE HARBOR IMMEDIATELY AS GUSTY WINDS AND HIGH WAVES ARE
EXPECTED.
THUNDERSTORMS CAN PRODUCE SUDDEN WATERSPOUTS. WATERSPOUTS CAN EASILY
OVERTURN BOATS AND CREATE LOCALLY HAZARDOUS SEAS. SEEK SAFE HARBOR
IMMEDIATELY.
LAT...LON 4162 8733 4164 8743 4168 8743 4167 8744
4169 8750 4175 8753 4179 8758 4178 8758
4188 8762 4211 8696 4179 8697 4179 8696
4172 8691 4166 8709 4165 8714 4163 8716
4162 8732 4161 8732
TIME...MOT...LOC 0204Z 257DEG 42KT 4198 8858 4167 8844 4122 8862
WATERSPOUT...POSSIBLE
HAIL...0.00IN
WIND...65KTS
YACK
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