829
FZUS63 KMKX 300808
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
308 AM CDT TUE JUN 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
MODEST TO BREEZY SOUTHERLY WINDS WILL PREVAIL INTO THURSDAY THEN
LIGHTER INTO FRIDAY AS HIGH PRESSURE AROUND 30.1 INCHES REMAINS
TO THE SOUTHEAST OF THE GREAT LAKES, WHILE TROUGHS OF LOW PRESSURE
AROUND 29.2 INCHES CONTINUE OVER CANADA INTO THE NORTHERN GREAT
PLAINS. AREAS OF DENSE FOG MAY DEVELOP DURING THE DAY DUE TO A
VERY HUMID AIRMASS FLOWING OVER THE COOLER WATERS OF THE LAKE.
SCATTERED THUNDERSTORMS ARE FORECAST ACROSS THE NORTHERN HALF
TONIGHT THROUGH WEDNESDAY NIGHT, AND ACROSS THE SOUTHERN TWO
THIRDS THURSDAY INTO FRIDAY, AND ACROSS THE WHOLE LAKE FRIDAY INTO
SATURDAY AS A COLD FRONT SHIFTS WINDS TO NORTHERLY.
LMZ261-362-364-366-563-565-567-669-868-870-301530-
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 SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE
TO MID LAKE-
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID
LAKE-
308 AM CDT TUE JUN 30 2026
PORT WASHINGTON WI TO WHITEHALL MI NORTH...
TODAY
SOUTH WINDS 15 TO 25 KT INCREASING TO 30 KT. SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS THIS MORNING. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT.
TONIGHT
SOUTH WINDS TO 30 KT BECOMING SOUTHWEST 15 TO 25 KT.
CHANCE OF SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS. WAVES 4 TO
6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT.
WEDNESDAY
SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH 15 TO
25 KT. CHANCE OF THUNDERSTORMS IN THE AFTERNOON. WAVES 3 TO 5 FT.
WEDNESDAY NIGHT
SOUTH WINDS 15 TO 25 KT BECOMING SOUTHWEST.
CHANCE OF SHOWERS AND THUNDERSTORMS IN THE EVENING, THEN SHOWERS
OVERNIGHT. WAVES 3 TO 5 FT.
THURSDAY
SOUTHWEST WINDS 15 TO 25 KT. WAVES 3 TO 5 FT.
THURSDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KT DIMINISHING TO
10 TO 15 KT. CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES 2 TO
4 FT.
FRIDAY
SOUTH WINDS 10 TO 15 KT INCREASING TO 10 TO 20 KT.
CHANCE OF SHOWERS. WAVES 1 TO 2 FT.
SATURDAY
NORTHEAST WINDS 10 TO 15 KT INCREASING TO 10 TO
20 KT. WAVES 1 TO 3 FT.
LMZ080-671-673-675-777-779-872-874-876-878-301530-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 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 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-
308 AM CDT TUE JUN 30 2026
PORT WASHINGTON WI TO WHITEHALL MI SOUTH...
TODAY
SOUTH WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT. WAVES
3 TO 5 FT.
TONIGHT
SOUTHWEST WINDS 10 TO 20 KT. WAVES 3 TO 5 FT.
WEDNESDAY
SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH. WAVES
3 TO 5 FT.
WEDNESDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KT INCREASING TO
15 TO 25 KT. WAVES 3 TO 5 FT.
THURSDAY
SOUTHWEST WINDS 10 TO 20 KT. WAVES 3 TO 5 FT.
THURSDAY NIGHT
SOUTHWEST WINDS 10 TO 15 KT. CHANCE OF SHOWERS
AND THUNDERSTORMS. WAVES 1 TO 3 FT.
FRIDAY
SOUTHWEST WINDS 10 TO 15 KT BECOMING SOUTH. CHANCE OF
SHOWERS. WAVES 1 TO 2 FT.
SATURDAY
NORTHWEST WINDS 10 TO 15 KT BECOMING NORTH 10 TO
20 KT. WAVES 1 TO 3 FT.
LMZ761-301530-
MAFOR 3010/
MICHIGAN NORTH 15430 11430 11530. A CHANCE OF SHOWERS TONIGHT.
WAVES 3 TO 6 FEET TODAY. WAVES 3 TO 6 FEET SUBSIDING TO 2 TO 4
FEET TONIGHT.
MICHIGAN SOUTH 11420 11520 13430 13520. WAVES 3 TO 6 FEET.
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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