831
WHUS73 KMKX 180759
MWWMKX
URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
259 AM CDT SAT APR 18 2026
LMZ643>646-181600-
/O.CON.KMKX.MF.Y.0004.000000T0000Z-260418T0900Z/
/O.CON.KMKX.SC.Y.0043.000000T0000Z-260419T0300Z/
SHEBOYGAN TO PORT WASHINGTON WI-
PORT WASHINGTON TO NORTH POINT LIGHT WI-
NORTH POINT LIGHT TO WIND POINT WI-
WIND POINT WI TO WINTHROP HARBOR IL-
259 AM CDT SAT APR 18 2026
...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 4 AM CDT EARLY THIS
MORNING...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 PM CDT THIS
EVENING...
* WHAT...FOR THE DENSE FOG ADVISORY, DENSE FOG WILL REDUCE
VISIBILITY TO 1 NM AT TIMES. FOR THE SMALL CRAFT ADVISORY, WEST
TO NORTHWEST WINDS 10 TO 20 KT WITH GUSTS UP TO 25 KT.
* WHERE...NEARSHORE WATERS FROM SHEBOYGAN TO WINTHROP HARBOR IL.
* WHEN...FOR THE DENSE FOG ADVISORY, UNTIL 4 AM CDT EARLY THIS
MORNING. FOR THE SMALL CRAFT ADVISORY, UNTIL 10 PM CDT THIS
EVENING.
* IMPACTS...CONDITIONS WILL BE HAZARDOUS TO SMALL CRAFT. LOW
VISIBILITY WILL MAKE NAVIGATION DIFFICULT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
INEXPERIENCED MARINERS, ESPECIALLY THOSE OPERATING SMALLER
VESSELS, SHOULD AVOID NAVIGATING IN HAZARDOUS CONDITIONS.
IF YOU MUST NAVIGATE, PROCEED WITH CAUTION. USE PROPER FOG
SIGNALS. MAKE SURE ALL RUNNING LIGHTS ARE ON. REMEMBER TO USE
YOUR RADAR AND COMPASS.
LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-180900-
/O.CON.KMKX.MF.Y.0004.000000T0000Z-260418T0900Z/
LAKE MICHIGAN MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM OFFSHORE TO
MID-LINE OF LAKE.-
LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE
MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH
FOX ISLAND 5NM OFFSHORE-
LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI 5NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5NM OFFSHORE
TO MID LAKE-
LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WILMETTE HARBOR TO MICHIGAN CITY IN 5NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM ST JOSEPH TO SOUTH HAVEN MI 5NM OFFSHORE TO
MID LAKE-
259 AM CDT SAT APR 18 2026
...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 4 AM CDT EARLY THIS
MORNING...
* WHAT...DENSE FOG WILL REDUCE VISIBILITY TO 1/4 TO 1/2 NM.
* WHERE...ALL OPEN WATERS OF LAKE MICHIGAN.
* WHEN...UNTIL 4 AM CDT EARLY THIS MORNING.
* IMPACTS...LOW VISIBILITY WILL MAKE NAVIGATION DIFFICULT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU MUST NAVIGATE, PROCEED WITH CAUTION. USE PROPER FOG
SIGNALS. MAKE SURE ALL RUNNING LIGHTS ARE ON. REMEMBER TO USE
YOUR RADAR AND COMPASS.
SHEPPARD
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