578
FZUS63 KMKX 171923
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
223 PM CDT THU JUL 17 2025
FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON LAKE MICHIGAN.
WAVES ARE PROVIDED AS A RANGE OF SIGNIFICANT WAVE HEIGHTS, WHICH
IS THE AVERAGE OF THE HIGHEST 1/3 OF THE WAVE, ALONG WITH THE
AVERAGE HEIGHT OF THE HIGHEST 10% OF THE WAVES WHICH WILL
OCCASIONALLY BE ENCOUNTERED.
SYNOPSIS
MODEST NORTHERLY WINDS WILL GRADUALLY WEAKEN INTO THE EVENING AS
HIGH PRESSURE AROUND 30.1 INCHES MOVES FROM NORTHERN MINNESOTA TO
NORTHERN LAKE MICHIGAN BY THIS EVENING. THE HIGH WILL THEN MOVE TO
THE MID ATLANTIC STATES BY FRIDAY NIGHT WHILE LOW PRESSURE AROUND
29.8 INCHES MOVES INTO THE UPPER MISSISSIPPI RIVER VALLEY. THUS
LIGHT TO MODEST NORTHEAST WINDS THIS EVENING WILL BECOME LIGHT AND
VARIABLE LATE TONIGHT INTO FRIDAY EVENING. LIGHT TO MODEST
SOUTHERLY WINDS WILL THEN DEVELOP SATURDAY MORNING AHEAD OF THE
APPROACHING WEAK LOW WITH WINDS TURNING NORTHERLY AGAIN AFTER THE
LOWS PASSAGE BY SATURDAY EVENING. LIGHT TO MODEST NORTHEAST WINDS
WILL THEN PREVAIL LATE SATURDAY NIGHT INTO SUNDAY WHILE ANOTHER
HIGH PRESSURE AREA AROUND 30.1 INCHES SETS UP OVER LAKE SUPERIOR.
LMZ261-362-364-366-563-565-567-868-180345-
LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM
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 5 NM OFFSHORE-
LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI-
LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID
LAKE-
223 PM CDT THU JUL 17 2025
SHEBOYGAN WI TO PENTWATER MI NORTH...
TONIGHT
NORTH WINDS 10 TO 20 KT BECOMING NORTHEAST 10 TO
15 KT, THEN VEERING TO EAST LATE. WAVES 3 TO 5 FT SUBSIDING TO
1 TO 3 FT.
FRIDAY
SOUTHEAST WINDS 5 TO 10 KT VEERING TO SOUTHWEST. WAVES
1 TO 2 FT.
FRIDAY NIGHT
SOUTHEAST WINDS 5 TO 10 KT BECOMING SOUTH. WAVES
1 FT OR LESS.
SATURDAY
SOUTH WINDS 10 TO 15 KT VEERING TO NORTHWEST 10 TO
20 KT. CHANCE OF SHOWERS AND THUNDERSTORMS IN THE MORNING, THEN
CHANCE OF SHOWERS IN THE AFTERNOON. WAVES 1 TO 2 FT.
SATURDAY NIGHT
NORTH WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.
SUNDAY
NORTHEAST WINDS 10 TO 15 KT BECOMING NORTH. WAVES 1 TO
2 FT.
SUNDAY NIGHT
NORTHEAST WINDS 10 TO 15 KT BECOMING EAST. WAVES
1 TO 2 FT.
MONDAY
SOUTHEAST WINDS 10 TO 20 KT BECOMING EAST. WAVES 1 TO
3 FT.
TUESDAY
SOUTH WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-180345-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE
TO MID LAKE-
LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO
MID LAKE-
223 PM CDT THU JUL 17 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH...
TONIGHT
NORTH WINDS 10 TO 20 KT BECOMING EAST 10 TO 15 KT.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT.
FRIDAY
EAST WINDS 10 TO 15 KT DIMINISHING TO 5 TO 10 KT. WAVES
1 TO 3 FT SUBSIDING TO 1 TO 2 FT.
FRIDAY NIGHT
NORTHEAST WINDS 5 TO 10 KT VEERING TO SOUTH.
CHANCE OF SHOWERS OVERNIGHT. WAVES 1 TO 2 FT.
SATURDAY
SOUTH WINDS 10 TO 15 KT BECOMING SOUTHWEST. CHANCE OF
SHOWERS IN THE MORNING, THEN CHANCE OF SHOWERS AND THUNDERSTORMS
IN THE AFTERNOON. WAVES 1 TO 2 FT.
SATURDAY NIGHT
NORTH WINDS 10 TO 15 KT BECOMING NORTHEAST.
CHANCE OF SHOWERS AND THUNDERSTORMS IN THE EVENING. WAVES 1 TO
3 FT.
SUNDAY
NORTHEAST WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.
SUNDAY NIGHT
NORTHEAST WINDS 10 TO 15 KT BECOMING EAST. WAVES
1 TO 3 FT.
MONDAY
SOUTHEAST WINDS 10 TO 20 KT. CHANCE OF SHOWERS. WAVES
2 TO 4 FT.
TUESDAY
SOUTH WINDS 10 TO 15 KT INCREASING TO 10 TO 20 KT.
CHANCE OF SHOWERS. WAVES 2 TO 4 FT.
LMZ761-180345-
MAFOR 1722/
MICHIGAN NORTH 11820 12110 11200 11300 11400 12500. WAVES 3 TO 5
FEET SUBSIDING TO 1 TO 3 FEET TONIGHT. WAVES 1 FOOT OR LESS
FRIDAY.
MICHIGAN SOUTH 12820 12110 12210 12300. WAVES 3 TO 6 FEET
SUBSIDING TO 1 TO 3 FEET TONIGHT. WAVES 1 TO 3 FEET FRIDAY.
GEHRING
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT
WEATHER.GOV/MKX/GLFTABLE
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:
WEATHER.GOV/GREATLAKES
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