339
FZUS63 KMKX 291939
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
239 PM CDT WED JUL 29 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
WINDS REMAIN LIGHT AND VARIABLE AS HIGH PRESSURE AROUND 30.0
INCHES BUILDS INTO THE GREAT LAKES REGION TODAY. THE CENTROID OF
THIS HIGH SHOULD SLOWLY SHIFT SOUTHEAST OF LAKE MICHIGAN ON
THURSDAY, ALLOWING FOR LIGHT SOUTHERLY WINDS THURSDAY AND THURSDAY
NIGHT.
LOW PRESSURE DEVELOPS NEAR NEBRASKA / THE DAKOTAS LATE THURSDAY,
DEEPENING TO AROUND 29.6 INCHES BEFORE CROSSING ILLINOIS SATURDAY
MORNING. LIGHT SOUTH WINDS TURN SOUTHEAST AND ACCELERATE OVER THE
SOUTHERN HALF OF THE LAKE FRIDAY, BACKING NORTHEAST WITH 15-20
KT GUSTS SATURDAY MORNING, THEN NORTH-NORTHEAST WITH GUSTS UP TO
25 KT SATURDAY AFTERNOON AND EVENING. AN ADDITIONAL PERIOD OF
BREEZY NORTH WINDS MAY UNFOLD SUNDAY AFTERNOON AND EVENING AS
HIGH PRESSURE BUILDS OVER LAKE SUPERIOR (20-30 KT POSSIBLE).
SLOWER WINDS AND GUSTS EXPECTED OVER THE NORTH HALF OF LAKE
MICHIGAN THROUGH THE AFOREMENTIONED TIMEFRAMES.
LMZ261-362-364-366-563-565-567-868-300330-
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-
239 PM CDT WED JUL 29 2026
SHEBOYGAN WI TO PENTWATER MI NORTH...
TONIGHT
SOUTHWEST WINDS 10 TO 15 KT DIMINISHING TO 5 TO 10 KT.
WAVES 1 TO 2 FT.
THURSDAY
SOUTHWEST WINDS 5 TO 10 KT BECOMING SOUTH 10 TO
20 KT. WAVES 1 TO 3 FT.
THURSDAY NIGHT
SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST
10 TO 15 KT. WAVES 1 TO 3 FT.
FRIDAY
SOUTHWEST WINDS 10 TO 15 KT INCREASING TO 10 TO 20 KT.
CHANCE OF SHOWERS IN THE AFTERNOON. WAVES 1 TO 3 FT.
FRIDAY NIGHT
SOUTH WINDS 10 TO 15 KT BACKING TO NORTHEAST.
CHANCE OF SHOWERS IN THE EVENING, THEN SHOWERS LIKELY OVERNIGHT.
WAVES 1 TO 3 FT.
SATURDAY
NORTH WINDS 10 TO 15 KT INCREASING TO 10 TO 20 KT.
CHANCE OF SHOWERS IN THE MORNING. WAVES 1 TO 3 FT.
SATURDAY NIGHT
NORTH WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.
SUNDAY
NORTHEAST WINDS 10 TO 20 KT BECOMING NORTH TO 30 KT.
WAVES 3 TO 5 FT.
MONDAY
SOUTHEAST WINDS 5 TO 10 KT BECOMING SOUTH 10 TO 20 KT.
WAVES 1 TO 2 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-300330-
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-
239 PM CDT WED JUL 29 2026
SHEBOYGAN WI TO PENTWATER MI SOUTH...
TONIGHT
NORTH WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT
LATE THIS EVENING, THEN BECOMING NORTHWEST AFTER MIDNIGHT
BECOMING WEST LATE. WAVES 2 TO 4 FT SUBSIDING TO 1 TO 2 FT.
THURSDAY
WEST WINDS 5 TO 10 KT BECOMING SOUTHWEST LATE IN THE
MORNING, THEN BECOMING SOUTHWEST 10 TO 15 KT EARLY IN THE
AFTERNOON BECOMING SOUTH 10 TO 20 KT LATE. WAVES 1 TO 2 FT.
THURSDAY NIGHT
SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST
10 TO 15 KT. WAVES 1 TO 3 FT.
FRIDAY
SOUTHWEST WINDS 10 TO 15 KT BECOMING SOUTH. WAVES 1 TO
3 FT.
FRIDAY NIGHT
EAST WINDS 10 TO 20 KT. CHANCE OF SHOWERS IN THE
EVENING, THEN SHOWERS LIKELY OVERNIGHT. WAVES 2 TO 4 FT BUILDING
TO 3 TO 5 FT.
SATURDAY
EAST WINDS 10 TO 20 KT BECOMING NORTHEAST 15 TO
25 KT. CHANCE OF SHOWERS IN THE MORNING. WAVES 3 TO 5 FT.
SATURDAY NIGHT
NORTHEAST WINDS 15 TO 25 KT DIMINISHING TO
10 TO 20 KT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
SUNDAY
NORTHEAST WINDS 10 TO 20 KT BECOMING NORTH TO 30 KT.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
MONDAY
EAST WINDS 10 TO 15 KT INCREASING TO 10 TO 20 KT. WAVES
2 TO 4 FT SUBSIDING TO 1 TO 3 FT.
LMZ761-300330-
MAFOR 2922/
MICHIGAN NORTH 11520 14500 11500 12410. WAVES 2 FEET OR LESS.
MICHIGAN SOUTH 11820 11810 11800 11700 12600 11510 11410. WAVES 1
TO 3 FEET SUBSIDING TO 1 FOOT OR LESS TONIGHT. WAVES 2 FEET OR
LESS THURSDAY.
SHEPPARD
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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