630
FZUS63 KMKX 082031
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
231 PM CST THU JAN 8 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
SOUTHERLY WINDS ACROSS LAKE MICHIGAN WILL GRADUALLY TURN AS LOW
PRESSURE AROUND 29.2 INCHES LIFTS FROM THE MO/IA BORDER INTO THE
NORTHERN HALF OF LAKE MICHIGAN OVERNIGHT. WILL SEE GUSTY SOUTH TO
SOUTHEASTERLY WINDS OVER THE SOUTHERN HALF OF LAKE MICHIGAN THIS
EVENING AS THE LOW APPROACHES THEN VEERING TO SOUTHWEST OVERNIGHT.
LIGHTER MORE EASTERLY WINDS ARE EXPECTED FOR THE NORTH HALF OF
THE LAKE, BUT GRADUALLY WEAKEN AS THE LOW PUSHES NORTHEASTWARD
INTO FRIDAY MORNING. BEHIND THE LOW, EXPECT MORE NORTH TO
NORTHWESTERLY WINDS PICK UP INTO FRIDAY MORNING. GIVEN THE TIGHT
PRESSURE GRADIENT ON THE BACKSIDE OF THIS DEPARTING SYSTEM, WILL
SEE GUSTS OF 30 KNOTS AND A FEW BRIEF GALE FORCE GUSTS THROUGH
LATE FRIDAY MORNING, ESPECIALLY ALONG THE EASTERN LAKESHORE.
WINDS WILL GRADUALLY WEAKEN FRIDAY AFTERNOON AS HIGH PRESSURE
AROUND 30.2 INCHES WORKS ITS WAY ACROSS THE LAKE MICHIGAN THROUGH
FRIDAY NIGHT. THEN LOOKING AT TWO AREAS OF LOW PRESSURE ONE COMING
UP FROM THE SOUTHERN PLAINS AND ANOTHER DIGGING DOWN ACROSS THE
UPPER MIDWEST MERGING OVER THE GREAT LAKES FOR SATURDAY. EXPECT
WEST- NORTHWESTERLY WINDS OVER LAKE MICHIGAN TO INCREASE ON THE
BACKSIDE OF THIS DEEPENING LOW PRESSURE AS IT LIFT INTO EASTERN
ONTARIO/QUEBEC. WILL BE A POTENTIAL FOR GALES ACROSS THE OPEN
WATER, BUT STILL SOME UNCERTAINTY ON THE OVERALL STRENGTH OF THE
LOW PRESSURE. THEN ANOTHER HIGH PRESSURE WILL BUILD ACROSS THE
REGION FOR SUNDAY BEFORE ANOTHER SYSTEM TRAVERSES THE REGION EARLY
NEXT WEEK.
LMZ261-362-364-366-563-565-567-868-090415-
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-
231 PM CST THU JAN 8 2026
SHEBOYGAN WI TO PENTWATER MI NORTH...
TONIGHT
SOUTHEAST WINDS TO 30 KT VEERING TO WEST. RAIN. WAVES
4 TO 7 FT OCCASIONALLY TO 9 FT BUILDING TO 6 TO 9 FT OCCASIONALLY
TO 12 FT.
FRIDAY
NORTHWEST WINDS TO 30 KT. RAIN AND SNOW LIKELY IN THE
MORNING. WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT SUBSIDING TO 4 TO
7 FT OCCASIONALLY TO 9 FT.
FRIDAY NIGHT
NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH 5 TO
10 KT LATE IN THE EVENING, THEN VEERING TO EAST AFTER MIDNIGHT
BECOMING SOUTHEAST LATE. WAVES 3 TO 5 FT SUBSIDING TO 1 TO 3 FT.
SATURDAY
SOUTHEAST WINDS 10 TO 20 KT BECOMING EAST 15 TO
25 KT. CHANCE OF SNOW IN THE MORNING, THEN SNOW LIKELY IN THE
AFTERNOON. WAVES 1 TO 3 FT BUILDING TO 3 TO 5 FT.
SATURDAY NIGHT
NORTH WINDS TO 30 KT. SNOW LIKELY. WAVES 5 TO
8 FT OCCASIONALLY TO 10 FT BUILDING TO 7 TO 10 FT OCCASIONALLY TO
13 FT.
SUNDAY
NORTH GALES TO 35 KT BECOMING NORTHWEST TO 30 KT. WAVES
8 TO 11 FT OCCASIONALLY TO 14 FT SUBSIDING TO 7 TO 10 FT
OCCASIONALLY TO 13 FT.
SUNDAY NIGHT
WEST WINDS 15 TO 25 KT BECOMING SOUTHWEST TO
30 KT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.
MONDAY
SOUTHWEST WINDS TO 30 KT. WAVES 5 TO 8 FT OCCASIONALLY
TO 10 FT.
TUESDAY
SOUTHWEST WINDS 10 TO 20 KT. CHANCE OF RAIN AND SNOW.
WAVES 3 TO 5 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-090415-
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-
231 PM CST THU JAN 8 2026
SHEBOYGAN WI TO PENTWATER MI SOUTH...
TONIGHT
SOUTHEAST WINDS TO 30 KT BECOMING SOUTHWEST. RAIN AND
SLIGHT CHANCE OF THUNDERSTORMS THIS EVENING, THEN CHANCE OF RAIN
AND SLIGHT CHANCE OF THUNDERSTORMS OVERNIGHT. WAVES 6 TO 9 FT
OCCASIONALLY TO 12 FT.
FRIDAY
WEST GALES TO 35 KT BECOMING NORTHWEST LATE IN THE
MORNING, THEN DIMINISHING TO 30 KT EARLY IN THE AFTERNOON
BECOMING NORTH 15 TO 25 KT LATE. CHANCE OF RAIN IN THE MORNING.
WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT SUBSIDING TO 6 TO 9 FT
OCCASIONALLY TO 12 FT.
FRIDAY NIGHT
NORTH WINDS 10 TO 15 KT VEERING TO SOUTHEAST 5 TO
10 KT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 2 TO
4 FT.
SATURDAY
SOUTH WINDS 10 TO 15 KT VEERING TO WEST 15 TO 25 KT
IN THE AFTERNOON. SNOW AND RAIN LIKELY. WAVES 1 TO 3 FT BUILDING
TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
SATURDAY NIGHT
WEST WINDS TO 30 KT BECOMING NORTHWEST GALES TO
35 KT. SNOW LIKELY. WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT
BUILDING TO 8 TO 12 FT OCCASIONALLY TO 16 FT.
SUNDAY
NORTHWEST GALES TO 35 KT DIMINISHING TO 30 KT. CHANCE
OF SNOW IN THE MORNING. WAVES 10 TO 14 FT OCCASIONALLY TO 18 FT.
SUNDAY NIGHT
WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST TO
30 KT. WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT.
MONDAY
SOUTHWEST WINDS TO 30 KT. WAVES 6 TO 9 FT OCCASIONALLY
TO 12 FT.
TUESDAY
SOUTHWEST WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.
CHANCE OF RAIN. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
LMZ761-090415-
MAFOR 0823/
MICHIGAN NORTH 11336 12346 11446 11746 11757 11750 11740. WAVES 3
TO 6 FEET BUILDING TO 5 TO 9 FEET TONIGHT. WAVES 6 TO 9 FEET
SUBSIDING TO 4 TO 7 FEET FRIDAY.
MICHIGAN SOUTH 11346 11446 11440 11540 11650 12750 11740. WAVES 3
TO 5 FEET BUILDING TO 6 TO 9 FEET TONIGHT. WAVES 5 TO 9 FEET
FRIDAY.
WAGNER
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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