681
FZUS63 KMKX 311344
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
844 AM CDT FRI OCT 31 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
28.9 INCH LOW PRESSURE OVER FAR SOUTHERN QUEBEC THIS MORNING WILL
CONTINUE NORTHEASTWARD INTO TOMORROW, WHILE ITS WESTWARD
EXTENDING COLD FRONT MOVES SLOWLY SOUTH ACROSS LAKE MICHIGAN THIS
AFTERNOON INTO SATURDAY MORNING. MODEST NORTHWEST WINDS WILL
BECOME NORTHERLY AFTER THE FRONTAL PASSAGE AND LAST INTO SATURDAY
EVENING. RAIN SHOWERS DEVELOPING OVER THE SOUTHERN THIRD OF LAKE
MICHIGAN ON SATURDAY COULD PRODUCE AN ISOLATED WATERSPOUT OR TWO,
THOUGH WIDESPREAD WATERSPOUT ACTIVITY IS NOT ANTICIPATED AT THIS
TIME. A SURFACE RIDGE AROUND 30.2 INCHES WILL THEN SHIFT INTO LAKE
MICHIGAN FOR SATURDAY NIGHT.
WINDS WILL SHIFT OUT OF THE SOUTHWEST AND QUICKLY INCREASE DURING
THE DAY ON SUNDAY, WHEN 29.2 INCH LOW PRESSURE IS FORECAST TO
DEVELOP ACROSS THE CANADIAN GREAT PLAINS. SOUTHWEST WINDS WILL
CONTINUE TO STRENGTHEN SUNDAY EVENING AND NIGHT AS THE AREA OF LOW
PRESSURE ADVANCES TOWARD HUDSON BAY. GALES ARE POSSIBLE DURING
THIS TIME FRAME, WITH TRENDS BEING MONITORED FOR POTENTIAL GALE
WATCHES IN COMING FORECASTS. A COLD FRONT WILL CROSS LAKE
MICHIGAN DURING THE DAY MONDAY, RESULTING IN A WEST TO NORTHWEST
WIND SHIFT AND ADDITIONAL GUSTS NEAR GALE FORCE. WINDS WILL WEAKEN
MONDAY NIGHT AS 30.2 INCH HIGH PRESSURE CROSSES THE WATERS.
WIDESPREAD AREAS OF RAIN ARE LIKELY SUNDAY NIGHT.
LMZ261-362-364-366-563-565-567-868-312130-
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-
844 AM CDT FRI OCT 31 2025
SHEBOYGAN WI TO PENTWATER MI NORTH...
REST OF TODAY
NORTHWEST WINDS 10 TO 20 KT. ISOLATED RAIN
SHOWERS THROUGH MID MORNING, THEN SLIGHT CHANCE OF RAIN SHOWERS
THIS AFTERNOON. WAVES 2 TO 4 FT.
TONIGHT
NORTH WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT.
CHANCE OF RAIN SHOWERS. WAVES 1 TO 3 FT.
SATURDAY
NORTH WINDS 10 TO 15 KT. CHANCE OF RAIN SHOWERS.
WAVES 1 TO 3 FT.
SATURDAY NIGHT
NORTH WINDS 10 TO 15 KT BECOMING NORTHWEST.
CHANCE OF RAIN SHOWERS IN THE EVENING. WAVES 1 TO 3 FT.
SUNDAY
SOUTHWEST WINDS 10 TO 20 KT INCREASING TO 30 KT IN THE
AFTERNOON. WAVES 1 TO 2 FT BUILDING TO 4 TO 7 FT OCCASIONALLY TO
9 FT.
SUNDAY NIGHT
SOUTHWEST GALES TO 45 KT. CHANCE OF RAIN SHOWERS.
WAVES 8 TO 11 FT OCCASIONALLY TO 14 FT BUILDING TO 10 TO 14 FT
OCCASIONALLY TO 18 FT.
MONDAY
WEST GALES TO 35 KT. CHANCE OF RAIN SHOWERS. WAVES
10 TO 14 FT OCCASIONALLY TO 18 FT SUBSIDING TO 8 TO 11 FT
OCCASIONALLY TO 14 FT.
TUESDAY
WEST WINDS 15 TO 25 KT. WAVES 4 TO 6 FT OCCASIONALLY
TO 8 FT SUBSIDING TO 3 TO 5 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-312130-
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-
844 AM CDT FRI OCT 31 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH...
REST OF TODAY
NORTHWEST WINDS 10 TO 20 KT. ISOLATED RAIN
SHOWERS THROUGH MID MORNING. WAVES 3 TO 5 FT.
TONIGHT
NORTHWEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO
15 KT. SLIGHT CHANCE OF RAIN SHOWERS IN THE EVENING, THEN CHANCE
OF RAIN SHOWERS OVERNIGHT. WAVES 3 TO 5 FT SUBSIDING TO 1 TO
3 FT.
SATURDAY
NORTHWEST WINDS 10 TO 15 KT BECOMING NORTH. RAIN
SHOWERS LIKELY. WAVES 2 TO 4 FT.
SATURDAY NIGHT
NORTH WINDS 10 TO 15 KT DIMINISHING TO 5 TO
10 KT. CHANCE OF RAIN SHOWERS. WAVES 1 TO 3 FT.
SUNDAY
WEST WINDS 10 TO 15 KT BECOMING SOUTHWEST 15 TO 25 KT
IN THE AFTERNOON. WAVES 1 TO 2 FT BUILDING TO 3 TO 5 FT.
SUNDAY NIGHT
SOUTHWEST WINDS TO 30 KT INCREASING TO GALES TO
35 KT. CHANCE OF SHOWERS. WAVES 8 TO 11 FT OCCASIONALLY TO 14 FT
BUILDING TO 10 TO 14 FT OCCASIONALLY TO 18 FT.
MONDAY
WEST GALES TO 35 KT. WAVES 10 TO 14 FT OCCASIONALLY TO
18 FT.
TUESDAY
WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST. WAVES 5 TO
8 FT OCCASIONALLY TO 10 FT SUBSIDING TO 3 TO 5 FT.
LMZ761-312130-
MAFOR 3116/
MICHIGAN NORTH 12720 12820 14810. A CHANCE OF RAIN SHOWERS
TONIGHT AND SATURDAY MORNING. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO
3 FEET THIS AFTERNOON. WAVES 1 TO 3 FEET TONIGHT AND SATURDAY
MORNING.
MICHIGAN SOUTH 11730 12720 13710 11716 11816. WAVES 3 TO 5 FEET
THIS AFTERNOON. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET
TONIGHT. WAVES 1 TO 3 FEET SATURDAY MORNING.
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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