732
FZUS63 KMKX 201934
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
234 PM CDT WED AUG 20 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
HIGH PRESSURE OF 30.1 INCHES WILL REMAIN NEARLY STATIONARY OVER
LAKE SUPERIOR AND THE UP THROUGH TOMORROW, BEFORE SLOWLY MOVING
SOUTH AND EXPANDING ACROSS SOUTHERN LAKE MICHIGAN AND LOWER
MICHIGAN ON FRIDAY. WINDS WILL BE BREEZY FROM THE NORTHEAST TODAY
AND TONIGHT, SLOWLY EASING INTO THURSDAY AND EARLY FRIDAY.
WINDS THEN TURN SOUTHERLY TO SOUTHWESTERLY FRIDAY AFTERNOON AHEAD
OF A STRONG COLD FRONT, WHICH WILL PASS ACROSS THE LAKE ON
SATURDAY. GUSTY WEST TO NORTHWEST WINDS ARE EXPECTED FROM LATE
SATURDAY THROUGH MONDAY.
LMZ261-362-364-366-563-565-567-868-210315-
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-
234 PM CDT WED AUG 20 2025
SHEBOYGAN WI TO PENTWATER MI NORTH...
TONIGHT
NORTH WINDS 10 TO 20 KT BECOMING NORTHEAST 10 TO
15 KT. PATCHY FOG OVERNIGHT. WAVES 2 TO 4 FT SUBSIDING TO 1 TO
3 FT.
THURSDAY
NORTHEAST WINDS 5 TO 10 KT BECOMING NORTH 10 TO
15 KT. AREAS OF DENSE FOG IN THE MORNING. WAVES 1 TO 3 FT.
THURSDAY NIGHT
NORTH WINDS 10 TO 15 KT BACKING TO SOUTHWEST.
WAVES 1 TO 3 FT SUBSIDING TO 1 FT OR LESS.
FRIDAY
SOUTHWEST WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.
FRIDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KT. CHANCE OF SHOWERS IN
THE EVENING, THEN CHANCE OF SHOWERS AND THUNDERSTORMS OVERNIGHT.
WAVES 1 TO 3 FT.
SATURDAY
WEST WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.
WAVES 1 TO 3 FT.
SATURDAY NIGHT
NORTHWEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
SUNDAY
WEST WINDS 10 TO 20 KT BECOMING NORTHWEST 15 TO 25 KT.
CHANCE OF SHOWERS. WAVES 2 TO 4 FT.
MONDAY
NORTHWEST WINDS 15 TO 25 KT INCREASING TO 30 KT. WAVES
3 TO 5 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-210315-
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-
234 PM CDT WED AUG 20 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH...
TONIGHT
NORTH WINDS 15 TO 25 KT BECOMING NORTHEAST LATE THIS
EVENING, THEN DIMINISHING TO 10 TO 20 KT AFTER MIDNIGHT BECOMING
EAST 10 TO 15 KT LATE. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
THURSDAY
NORTHEAST WINDS 10 TO 15 KT BECOMING NORTH 10 TO
20 KT. WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.
THURSDAY NIGHT
NORTH WINDS 10 TO 20 KT DIMINISHING TO 10 TO
15 KT LATE IN THE EVENING, THEN BECOMING NORTHEAST AFTER MIDNIGHT
BECOMING EAST LATE. WAVES 1 TO 3 FT.
FRIDAY
SOUTHWEST WINDS 5 TO 10 KT INCREASING TO 10 TO 15 KT.
WAVES 1 TO 2 FT.
FRIDAY NIGHT
SOUTHWEST WINDS 10 TO 15 KT INCREASING TO 10 TO
20 KT. WAVES 1 TO 3 FT.
SATURDAY
WEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
SATURDAY NIGHT
NORTHWEST WINDS 10 TO 20 KT. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT.
SUNDAY
NORTHWEST WINDS 10 TO 20 KT BECOMING WEST 15 TO 25 KT.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
MONDAY
NORTHWEST WINDS 15 TO 25 KT. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT.
LMZ761-210315-
MAFOR 2022/
MICHIGAN NORTH 12820 11120 11110 11104 11100 12810. WAVES 1 TO 3
FEET BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO 3 FEET
TONIGHT. WAVES 2 FEET OR LESS THURSDAY.
MICHIGAN SOUTH 12830 11120 11210 13110 11820. WAVES 2 TO 4 FEET
BUILDING TO 3 TO 5 FEET, THEN SUBSIDING TO 2 TO 4 FEET TONIGHT.
WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET THURSDAY.
BOXELL
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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