431
FZUS63 KMKX 181419
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
919 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
LIGHT TO MODEST NORTHEAST WINDS OVER THE NORTHERN HALF OF THE
LAKE WILL GRADUALLY EXPAND INTO THE SOUTHERN HALF OF THE LAKE THIS
AFTERNOON WITH THE PASSAGE OF A WEAK BACKDOOR COLD FRONT. LIGHT
TO MODEST NORTHEAST WINDS ARE THEN EXPECTED TONIGHT BECOMING
EASTERLY ON FRIDAY. BREEZY EAST TO SOUTHEAST WINDS WILL THEN
PREVAIL FRIDAY NIGHT THROUGH SATURDAY MORNING AS CANADIAN HIGH
PRESSURE STRENGTHENS TO AROUND 30.4 INCHES AS IT MOVES INTO THE
LOWER GREAT LAKES AND SOUTHERN QUEBEC, AND AS LOW PRESSURE AROUND
29.9 INCHES MOVES FROM THE EASTERN DAKOTAS INTO MINNESOTA.
INTERMITTENT SHOWERS AND THUNDERSTORMS ARE EXPECTED FRIDAY NIGHT
THROUGH SUNDAY.
LMZ261-362-364-366-563-565-567-868-182130-
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-
919 AM CDT THU SEP 18 2025
SHEBOYGAN WI TO PENTWATER MI NORTH...
REST OF TODAY
NORTH WINDS 5 TO 10 KT INCREASING TO 10 TO
15 KT. PATCHY FOG LATE THIS MORNING. ISOLATED SHOWERS. WAVES 1 TO
2 FT.
TONIGHT
NORTH WINDS 10 TO 15 KT BECOMING EAST. WAVES 1 TO
3 FT.
FRIDAY
EAST WINDS 10 TO 15 KT BECOMING NORTHEAST 10 TO 20 KT.
WAVES 2 TO 4 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.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-182130-
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-
919 AM CDT THU SEP 18 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH...
REST OF TODAY
LIGHT AND VARIABLE WINDS 10 KNOTS OR LESS
BECOMING NORTHEAST IN THE AFTERNOON. 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.
LMZ761-182130-
MAFOR 1816/
MICHIGAN NORTH 13810 13110 12210. WAVES 2 FEET OR LESS.
MICHIGAN SOUTH 11600 14110 13210. WAVES 2 FEET OR LESS.
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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