506
FZUS63 KMKX 300800
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
300 AM CDT THU APR 30 2026
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
NORTH-NORTHWEST WINDS WILL CONTINUE THROUGH THE END OF THE WEEK
AS 29.6 INCH LOW PRESSURE SHIFTS INTO THE CANADIAN MARITIMES AND
30.2 INCH HIGH PRESSURE BUILDS INTO THE NORTHERN GREAT PLAINS.
WINDS WILL SHIFT SOUTH-SOUTHWESTERLY SATURDAY INTO SUNDAY AS THE
HIGH PRESSURE MOVES INTO THE OHIO RIVER VALLEY AND 29.5 INCH LOW
PRESSURE FORMS OVER THE HUDSON BAY. WINDS WILL BRIEFLY VEER
WESTERLY SUNDAY NIGHT INTO MONDAY AS A WEAK COLD FRONT CROSSES
LAKE MICHIGAN. SHOWERS AND A FEW THUNDERSTORMS WILL ACCOMPANY THE
FRONT, WITH SEVERE WEATHER NOT ANTICIPATED AT THIS TIME.
LOW PRESSURE NEAR 29.3 INCHES WILL DEVELOP NEAR LAKE SUPERIOR
MONDAY, LIFTING TOWARD THE SOUTHERN HUDSON BAY AND QUEBEC ON
TUESDAY. PROGRESSION OF THE LOW WILL BRING WEST-SOUTHWESTERLY
WINDS MONDAY NIGHT THROUGH WEDNESDAY. A COLD FRONT IS FORECAST TO
CROSS THE OPEN WATERS WEDNESDAY AFTERNOON, BRINGING A NORTHWEST
WIND SHIFT.
LMZ261-362-364-366-563-565-567-868-301515-
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-
300 AM CDT THU APR 30 2026
SHEBOYGAN WI TO PENTWATER MI NORTH...
TODAY
NORTHWEST WINDS 10 TO 15 KT BACKING TO SOUTHWEST 10 TO
20 KT. SLIGHT CHANCE OF RAIN SHOWERS. WAVES 1 TO 2 FT.
TONIGHT
WEST WINDS 10 TO 20 KT VEERING TO NORTH 10 TO 15 KT.
SLIGHT CHANCE OF RAIN SHOWERS IN THE EVENING. WAVES 1 TO 3 FT.
FRIDAY
NORTH WINDS 10 TO 15 KT BECOMING NORTHWEST 10 TO 20 KT.
WAVES 1 TO 3 FT.
FRIDAY NIGHT
NORTH WINDS 10 TO 20 KT DIMINISHING TO 10 TO
15 KT. WAVES 1 TO 2 FT.
SATURDAY
NORTHWEST WINDS 10 TO 20 KT BACKING TO SOUTHWEST.
WAVES 1 TO 2 FT.
SATURDAY NIGHT
SOUTHWEST WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.
SUNDAY
SOUTHWEST WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.
WAVES 2 TO 4 FT.
MONDAY
SOUTHWEST WINDS 15 TO 25 KT INCREASING TO 30 KT. CHANCE
OF RAIN SHOWERS. WAVES 2 TO 4 FT BUILDING TO 4 TO 6 FT
OCCASIONALLY TO 8 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-301515-
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-
300 AM CDT THU APR 30 2026
SHEBOYGAN WI TO PENTWATER MI SOUTH...
TODAY
NORTHWEST WINDS 5 TO 10 KT VEERING TO SOUTHEAST 10 TO
15 KT. SLIGHT CHANCE OF RAIN SHOWERS THIS AFTERNOON. WAVES 1 TO
2 FT.
TONIGHT
SOUTH WINDS 5 TO 10 KT VEERING TO NORTH. SLIGHT CHANCE
OF RAIN SHOWERS IN THE EVENING. WAVES 1 FT OR LESS BUILDING TO
1 TO 3 FT.
FRIDAY
NORTH WINDS 10 TO 15 KT INCREASING TO 10 TO 20 KT.
WAVES 1 TO 3 FT.
FRIDAY NIGHT
NORTH WINDS 10 TO 15 KT DIMINISHING TO 5 TO
10 KT. WAVES 1 TO 3 FT.
SATURDAY
NORTH WINDS 10 TO 15 KT INCREASING TO 10 TO 20 KT.
WAVES 1 TO 2 FT.
SATURDAY NIGHT
SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST.
WAVES 1 TO 3 FT.
SUNDAY
SOUTHWEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
MONDAY
SOUTHWEST WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.
WAVES 3 TO 5 FT.
LMZ761-301515-
MAFOR 3010/
MICHIGAN NORTH 12710 11610 12510 11710 12810. A CHANCE OF RAIN
SHOWERS EARLY THIS MORNING. WAVES 2 FEET OR LESS.
MICHIGAN SOUTH 11700 12810 11210 11400 11500 11700 11810. WAVES 2
FEET OR LESS.
MH
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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