777
FZUS63 KMKX 190202
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
902 PM CDT MON AUG 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
WEAK LOW PRESSURE AROUND 29.9 INCHES CROSSING SOUTHERN WISCONSIN
THIS EVENING WILL CROSS SOUTHERN LOWER MICHIGAN ON TUESDAY. HIGH
PRESSURE AROUND 30.1 INCHES SITTING OVER ONTARIO WILL REMAIN IN
PLACE THROUGH MUCH OF THE WEEK. A PERIOD OF ELEVATED NORTHERLY
WINDS IS EXPECTED TUESDAY, THEN LIGHT AND VARIABLE WINDS WILL
DEVELOP AS THE HIGH GLIDES OVER LAKE MICHIGAN LATER IN THE WEEK.
LMZ261-362-364-366-563-565-567-868-190945-
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-
902 PM CDT MON AUG 18 2025
SHEBOYGAN WI TO PENTWATER MI NORTH...
REST OF TONIGHT
SOUTHEAST WINDS 15 TO 25 KT DIMINISHING TO
10 TO 20 KT. CHANCE OF SHOWERS. WAVES 3 TO 5 FT.
TUESDAY
SOUTHEAST WINDS 10 TO 20 KT BACKING TO NORTHEAST.
SLIGHT CHANCE OF SHOWERS IN THE MORNING. WAVES 2 TO 4 FT.
TUESDAY NIGHT
NORTH WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
WEDNESDAY
NORTH WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.
WAVES 3 TO 5 FT.
WEDNESDAY NIGHT
NORTHEAST WINDS 10 TO 20 KT. WAVES 3 TO 5 FT
SUBSIDING TO 2 TO 4 FT.
THURSDAY
NORTHEAST WINDS 5 TO 10 KT BECOMING NORTH 10 TO 20 KT
IN THE AFTERNOON. WAVES 1 TO 2 FT.
THURSDAY NIGHT
EAST WINDS 10 TO 15 KT VEERING TO SOUTH. WAVES
1 TO 2 FT.
FRIDAY
SOUTHWEST WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.
SATURDAY
NORTHWEST WINDS 10 TO 20 KT BECOMING WEST 15 TO
25 KT. WAVES 1 TO 3 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-190945-
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-
902 PM CDT MON AUG 18 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH...
REST OF TONIGHT
SOUTHEAST WINDS 10 TO 20 KT BECOMING SOUTH.
SHOWERS AND THUNDERSTORMS LIKELY THROUGH EARLY EVENING, THEN
CHANCE OF SHOWERS AND THUNDERSTORMS OVERNIGHT. WAVES 3 TO 5 FT.
TUESDAY
WEST WINDS 10 TO 20 KT VEERING TO NORTH. CHANCE OF
SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS IN THE MORNING. WAVES
3 TO 5 FT.
TUESDAY NIGHT
NORTH WINDS 10 TO 20 KT. WAVES 3 TO 5 FT.
WEDNESDAY
NORTH WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
WEDNESDAY NIGHT
NORTH WINDS 15 TO 25 KT BECOMING NORTHEAST
10 TO 20 KT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 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 BECOMING EAST 5 TO
10 KT. WAVES 1 TO 3 FT.
FRIDAY
SOUTHWEST WINDS 5 TO 10 KT INCREASING TO 10 TO 15 KT.
WAVES 1 TO 2 FT.
SATURDAY
NORTHWEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
LMZ761-190945-
MAFOR 1904/
MICHIGAN NORTH 11330 12320 11220 11110 12120 11820. A CHANCE OF
SHOWERS OVERNIGHT. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET
OVERNIGHT AND TUESDAY. WAVES 1 TO 3 FEET TUESDAY EVENING.
MICHIGAN SOUTH 11426 11420 11520 11610 11720 13820. A CHANCE OF
THUNDERSTORMS OVERNIGHT. WAVES 1 TO 3 FEET BUILDING TO 2 TO 4
FEET OVERNIGHT. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET
TUESDAY. WAVES 2 TO 4 FEET TUESDAY EVENING.
CRONCE
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT
WEATHER.GOV/MKX/GLFTABLE
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:
WEATHER.GOV/GREATLAKES
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page