855
FZUS63 KMKX 010201
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
901 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
DEEP LOW PRESSURE AROUND 28.8 INCHES NEAR NEW BRUNSWICK CANADA
WILL CONTINUE NORTHEASTWARD INTO TOMORROW, WHILE ITS WESTWARD
EXTENDING COLD FRONT MOVES SLOWLY SOUTH ACROSS LAKE MICHIGAN
THROUGH SATURDAY MORNING. MODEST NORTHWEST WINDS WILL BECOME
NORTHERLY AFTER THE FRONTAL PASSAGE LATE TONIGHT THROUGH SATURDAY
MORNING AND PERSIST 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.
LMZ261-362-364-366-563-565-567-868-010930-
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-
901 PM CDT FRI OCT 31 2025
SHEBOYGAN WI TO PENTWATER MI NORTH...
REST OF TONIGHT
NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH
10 TO 15 KT. SCATTERED RAIN SHOWERS. WAVES 1 TO 3 FT.
SATURDAY
NORTH WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT.
SCATTERED RAIN SHOWERS IN THE MORNING, THEN ISOLATED 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 3 FT BUILDING TO 4 TO 7 FT
OCCASIONALLY TO 9 FT.
SUNDAY NIGHT
SOUTHWEST GALES TO 40 KT. RAIN SHOWERS LIKELY IN
THE EVENING, THEN RAIN SHOWERS OVERNIGHT. WAVES 8 TO 11 FT
OCCASIONALLY TO 14 FT BUILDING TO 8 TO 12 FT OCCASIONALLY TO
16 FT.
MONDAY
WEST GALES TO 35 KT DIMINISHING TO 30 KT. CHANCE OF
RAIN SHOWERS. WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT SUBSIDING TO
5 TO 8 FT OCCASIONALLY TO 10 FT.
MONDAY NIGHT
WEST GALES TO 35 KT DIMINISHING TO 30 KT. WAVES
5 TO 8 FT OCCASIONALLY TO 10 FT.
TUESDAY
WEST WINDS 15 TO 25 KT BECOMING SOUTHWEST. WAVES 3 TO
5 FT.
WEDNESDAY
WEST WINDS 10 TO 20 KT BECOMING NORTHWEST 15 TO
25 KT. CHANCE OF RAIN SHOWERS. WAVES 4 TO 6 FT OCCASIONALLY TO
8 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-010930-
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-
901 PM CDT FRI OCT 31 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH...
REST OF TONIGHT
WEST WINDS 10 TO 15 KT BECOMING NORTHWEST.
SCATTERED RAIN SHOWERS. WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.
SATURDAY
NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH 10 TO
15 KT. SLIGHT CHANCE OF WATERSPOUTS. SCATTERED RAIN SHOWERS.
WAVES 2 TO 4 FT.
SATURDAY NIGHT
NORTH WINDS 10 TO 15 KT DIMINISHING TO 5 TO
10 KT. SCATTERED 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 GALES TO 35 KT. CHANCE OF SHOWERS.
WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT BUILDING TO 8 TO 12 FT
OCCASIONALLY TO 16 FT.
MONDAY
WEST WINDS TO 30 KT. CHANCE OF SHOWERS. WAVES 8 TO
11 FT OCCASIONALLY TO 14 FT SUBSIDING TO 7 TO 10 FT OCCASIONALLY
TO 13 FT.
MONDAY NIGHT
NORTHWEST WINDS TO 30 KT DIMINISHING TO 15 TO
25 KT. WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT SUBSIDING TO 6 TO
9 FT OCCASIONALLY TO 12 FT.
TUESDAY
WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST. WAVES 4 TO
7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 3 TO 5 FT.
WEDNESDAY
WEST WINDS 15 TO 25 KT BECOMING NORTHWEST. CHANCE OF
SHOWERS. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT.
LMZ761-010930-
MAFOR 0104/
MICHIGAN NORTH 12810 19816 11810 11810 19816 13810 11800. WAVES 1
TO 3 FEET OVERNIGHT. WAVES 2 FEET OR LESS SATURDAY AND SATURDAY
EVENING.
MICHIGAN SOUTH 13710 19716 11820 19826 14810 19816. WAVES 1 TO 3
FEET.
CRONCE
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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