036
FZUS63 KMKX 091350
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
850 AM CDT TUE SEP 9 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 AROUND 30.4 INCHES WILL CONTINUE TO MOVE EAST OUT OF
THE GREAT LAKES AND INTO THE NEW ENGLAND STATES TODAY. MEANWHILE
A WAVE OF LOW PRESSURE WILL MOVE ACROSS LAKE SUPERIOR LATER TODAY,
WITH BREEZY SOUTH WINDS AHEAD OF THE WAVE, ESPECIALLY ACROSS THE
NORTH HALF OF THE LAKE. THE BREEZY SOUTH WINDS WILL BECOME MUCH
LIGHTER TONIGHT AND WEDNESDAY. LIGHT NORTHEAST TO EAST WINDS WILL
PREVAIL ON THURSDAY, AFTER A WEAK FRONTAL PASSAGE. WINDS WILL
BECOME SOUTH TO SOUTHEAST ON FRIDAY, WITH HIGH PRESSURE AROUND
30.3 INCHES WELL TO THE NORTHEAST OF THE REGION.
LMZ261-362-364-366-563-565-567-868-092130-
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-
850 AM CDT TUE SEP 9 2025
SHEBOYGAN WI TO PENTWATER MI NORTH...
REST OF TODAY
SOUTH WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.
WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT SUBSIDING TO 4 TO 7 FT
OCCASIONALLY TO 9 FT.
TONIGHT
SOUTH WINDS 15 TO 25 KT BECOMING SOUTHWEST 10 TO
15 KT. SLIGHT CHANCE OF SHOWERS. WAVES 4 TO 6 FT OCCASIONALLY TO
8 FT SUBSIDING TO 3 TO 5 FT.
WEDNESDAY
SOUTHWEST WINDS 5 TO 10 KT. WAVES 1 TO 3 FT
SUBSIDING TO 1 TO 2 FT.
WEDNESDAY NIGHT
NORTHEAST WINDS 5 TO 10 KT. WAVES 1 FT OR
LESS.
THURSDAY
NORTHEAST WINDS 10 TO 15 KT. WAVES 1 FT OR LESS.
THURSDAY NIGHT
NORTHEAST WINDS 10 TO 15 KT BECOMING SOUTHEAST
5 TO 10 KT. WAVES 1 FT OR LESS.
FRIDAY
SOUTH WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.
SATURDAY
SOUTH WINDS 10 TO 20 KT. CHANCE OF SHOWERS. WAVES
1 TO 3 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-092130-
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-
850 AM CDT TUE SEP 9 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH...
REST OF TODAY
SOUTH WINDS 10 TO 20 KT. WAVES 3 TO 5 FT.
TONIGHT
SOUTHEAST WINDS 10 TO 20 KT BECOMING SOUTH 5 TO 10 KT.
WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.
WEDNESDAY
SOUTH WINDS 5 TO 10 KT BECOMING SOUTHEAST. WAVES
1 TO 2 FT.
WEDNESDAY NIGHT
EAST WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.
THURSDAY
EAST WINDS 5 TO 10 KT BECOMING NORTHEAST 10 TO 15 KT.
WAVES 1 FT OR LESS.
THURSDAY NIGHT
NORTHEAST WINDS 5 TO 10 KT BECOMING EAST. WAVES
1 TO 2 FT.
FRIDAY
SOUTHEAST WINDS 5 TO 10 KT INCREASING TO 10 TO 15 KT.
WAVES 1 TO 2 FT.
SATURDAY
SOUTH WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.
LMZ761-092130-
MAFOR 0916/
MICHIGAN NORTH 11440 13430 11420 11510 11500 11400. WAVES 4 TO 7
FEET SUBSIDING TO 3 TO 6 FEET THIS AFTERNOON. WAVES 3 TO 6 FEET
SUBSIDING TO 1 TO 3 FEET TONIGHT. WAVES 1 TO 3 FEET WEDNESDAY
MORNING.
MICHIGAN SOUTH 12420 11320 11310 11410 13400. WAVES 2 TO 4 FEET
THIS AFTERNOON. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET
TONIGHT. WAVES 1 FOOT OR LESS WEDNESDAY MORNING.
PATTERSON
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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