410
FZUS63 KMKX 311938
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
238 PM 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
28.8 INCH LOW PRESSURE OVER FAR SOUTHERN QUEBEC THIS AFTERNOON 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 HALF 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.
LMZ261-362-364-366-563-565-567-868-010315-
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-
238 PM CDT FRI OCT 31 2025
SHEBOYGAN WI TO PENTWATER MI NORTH...
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 IN
THE MORNING, THEN SLIGHT CHANCE OF RAIN SHOWERS IN THE AFTERNOON.
WAVES 1 TO 3 FT.
SATURDAY NIGHT
NORTH WINDS 10 TO 15 KT BACKING TO WEST. WAVES
1 TO 3 FT SUBSIDING TO 1 FT OR LESS.
SUNDAY
SOUTHWEST WINDS 10 TO 20 KT INCREASING TO GALES TO
35 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. RAIN SHOWERS LIKELY IN
THE EVENING, THEN RAIN SHOWERS OVERNIGHT. 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 DIMINISHING TO 30 KT. CHANCE OF
RAIN SHOWERS. WAVES 10 TO 14 FT OCCASIONALLY TO 18 FT SUBSIDING
TO 8 TO 11 FT OCCASIONALLY TO 14 FT.
MONDAY NIGHT
WEST GALES TO 35 KT DIMINISHING TO 30 KT. WAVES
6 TO 9 FT OCCASIONALLY TO 12 FT.
TUESDAY
WEST WINDS 15 TO 25 KT BECOMING SOUTHWEST. WAVES 4 TO
6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT.
WEDNESDAY
WEST WINDS 10 TO 20 KT BECOMING NORTHWEST 15 TO
25 KT. CHANCE OF RAIN SHOWERS. WAVES 6 TO 9 FT OCCASIONALLY TO
12 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-010315-
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-
238 PM CDT FRI OCT 31 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH...
TONIGHT
NORTHWEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO
15 KT. CHANCE OF RAIN SHOWERS. WAVES 3 TO 5 FT SUBSIDING TO 1 TO
3 FT.
SATURDAY
NORTHWEST WINDS 10 TO 15 KT BECOMING NORTH. SLIGHT
CHANCE OF WATERSPOUTS WITH PATCHY FOG IN THE MORNING, THEN SLIGHT
CHANCE OF WATERSPOUTS IN THE AFTERNOON. CHANCE OF RAIN SHOWERS
AND THUNDERSTORMS IN THE MORNING, THEN CHANCE OF RAIN SHOWERS IN
THE AFTERNOON. WAVES 2 TO 4 FT.
SATURDAY NIGHT
NORTH WINDS 10 TO 15 KT DIMINISHING TO 5 TO
10 KT. CHANCE OF RAIN SHOWERS IN THE EVENING. WAVES 1 TO 3 FT.
SUNDAY
SOUTHWEST WINDS 10 TO 15 KT INCREASING TO 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. CHANCE OF SHOWERS.
WAVES 8 TO 11 FT OCCASIONALLY TO 14 FT BUILDING TO 10 TO 14 FT
OCCASIONALLY TO 18 FT.
MONDAY
WEST WINDS TO 30 KT. CHANCE OF SHOWERS. WAVES 10 TO
14 FT OCCASIONALLY TO 18 FT.
MONDAY NIGHT
NORTHWEST WINDS TO 30 KT DIMINISHING TO 15 TO
25 KT. WAVES 10 TO 14 FT OCCASIONALLY TO 18 FT SUBSIDING TO 8 TO
11 FT OCCASIONALLY TO 14 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.
WEDNESDAY
WEST WINDS 15 TO 25 KT BECOMING NORTHWEST. CHANCE OF
SHOWERS. WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT.
LMZ761-010315-
MAFOR 3122/
MICHIGAN NORTH 12820 15810. A CHANCE OF RAIN SHOWERS TONIGHT AND
SATURDAY MORNING. WAVES 1 TO 3 FEET TONIGHT. WAVES 2 FEET OR LESS
SATURDAY.
MICHIGAN SOUTH 11720 14710 13810. A CHANCE OF SHOWERS TONIGHT. A
CHANCE OF SHOWERS AND THUNDERSTORMS SATURDAY MORNING, THEN A
CHANCE OF SHOWERS SATURDAY AFTERNOON. WAVES 2 TO 4 FEET SUBSIDING
TO 1 TO 3 FEET TONIGHT. WAVES 1 TO 3 FEET SATURDAY.
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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