875
FZUS63 KMKX 180748
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
248 AM CDT THU SEP 18 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
WINDS REMAIN LIGHT AND VARIABLE OVER THE SOUTHERN HALF OF THE LAKE,
WITH A LIGHT NORTHEAST WIND DEVELOPING OVER THE NORTHERN HALF OF
THE LAKE IN RESPONSE TO A WEAK BACKDOOR COLD FRONT THROUGH THIS
MORNING. THIS FRONT SAGS SOUTHWARD ACROSS THE REST OF THE LAKE BY
THIS AFTERNOON, BRINGING STEADY NORTH WINDS.
LIGHT TO MODERATE NORTHEAST WINDS ARE THEN EXPECTED INTO FRIDAY,
BECOMING BREEZY AND VEERING SOUTHEAST FRIDAY NIGHT THROUGH
SATURDAY MORNING AS THE HIGH PRESSURE STRENGTHENS TO AROUND 30.4
INCHES AND APPROACHES SOUTHERN ONTARIO AND QUEBEC AND AS LOW
PRESSURE AROUND 29.9 INCHES MOVES INTO THE DAKOTAS AND MINNESOTA.
ON AND OFF THUNDERSTORMS ARE EXPECTED FRIDAY NIGHT THROUGH SUNDAY.
LMZ261-362-364-366-563-565-567-868-181530-
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-
248 AM CDT THU SEP 18 2025
SHEBOYGAN WI TO PENTWATER MI NORTH...
TODAY
NORTHEAST WINDS 5 TO 10 KT BECOMING NORTH. PATCHY FOG
THIS MORNING. SLIGHT CHANCE OF SHOWERS THIS MORNING, THEN SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS THIS AFTERNOON. WAVES 1 TO
2 FT.
TONIGHT
NORTHEAST WINDS 10 TO 15 KT BECOMING EAST. SLIGHT
CHANCE OF SHOWERS IN THE EVENING. WAVES 1 TO 3 FT.
FRIDAY
EAST WINDS 10 TO 15 KT BECOMING NORTHEAST 10 TO 20 KT.
WAVES 1 TO 3 FT.
FRIDAY NIGHT
EAST WINDS 15 TO 25 KT BECOMING SOUTHEAST. WAVES
2 TO 4 FT BUILDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
SATURDAY
SOUTHEAST WINDS 10 TO 20 KT INCREASING TO 15 TO
25 KT. CHANCE OF SHOWERS. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
SATURDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KT. CHANCE OF SHOWERS.
WAVES 2 TO 4 FT.
SUNDAY
SOUTH WINDS 10 TO 20 KT. CHANCE OF SHOWERS. WAVES 2 TO
4 FT.
MONDAY
SOUTHWEST WINDS 10 TO 15 KT INCREASING TO 10 TO 20 KT.
CHANCE OF SHOWERS. WAVES 1 TO 3 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-181530-
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-
248 AM CDT THU SEP 18 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH...
TODAY
SOUTH WINDS LESS THAN 10 KT BECOMING SOUTHWEST LATE THIS
MORNING, THEN BECOMING NORTH EARLY THIS AFTERNOON INCREASING TO
10 TO 15 KT LATE. WAVES 1 TO 2 FT.
TONIGHT
NORTHEAST WINDS 10 TO 15 KT BECOMING EAST. WAVES 1 TO
3 FT.
FRIDAY
EAST WINDS 10 TO 15 KT BECOMING NORTHEAST. WAVES 1 TO
3 FT.
FRIDAY NIGHT
EAST WINDS 10 TO 20 KT BECOMING SOUTHEAST 15 TO
25 KT. WAVES 2 TO 4 FT BUILDING TO 4 TO 6 FT OCCASIONALLY TO
8 FT.
SATURDAY
SOUTHEAST WINDS 10 TO 20 KT. CHANCE OF SHOWERS IN THE
AFTERNOON. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO
5 FT.
SATURDAY NIGHT
SOUTHEAST WINDS 10 TO 15 KT INCREASING TO 10 TO
20 KT. CHANCE OF SHOWERS. WAVES 2 TO 4 FT.
SUNDAY
SOUTH WINDS 10 TO 20 KT. CHANCE OF SHOWERS. WAVES 2 TO
4 FT.
MONDAY
SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH. CHANCE OF
SHOWERS. WAVES 1 TO 3 FT.
LMZ761-181530-
MAFOR 1810/
MICHIGAN NORTH 12100 12810 14110. WAVES 2 FEET OR LESS.
MICHIGAN SOUTH 11400 11500 11800 12810 12110 11210. WAVES 2 FEET
OR LESS.
CMILLER
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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