102
FZUS63 KMKX 310801
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
301 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
29.2 INCH LOW PRESSURE IS CENTERED OVER THE NORTHEASTERN UNITED
STATES THIS MORNING, RESULTING IN BREEZY NORTHWEST WINDS ACROSS LAKE
MICHIGAN. NORTHWEST WINDS WILL CONTINUE THROUGH TODAY AS WEAK LOW
PRESSURE OF 29.9 INCHES MOVES INTO WISCONSIN FROM THE NORTHERN GREAT
PLAINS. WINDS WILL TURN NORTHERLY TONIGHT AS THE LOW SHIFTS SOUTH
AND 30.3 INCH HIGH PRESSURE BUILDS INTO THE NORTHERN GREAT PLAINS.
LAKE EFFECT SHOWERS WILL CONTINUE INTO THIS AFTERNOON ACROSS THE
EASTERN HALF OF LAKE MICHIGAN, WITH RAIN CHANCES EXPANDING TO THE
ENTIRETY OF THE WATERS TONIGHT AS THE AFOREMENTIONED LOW PRESSURE
PASSES BY. PRECIP CHANCES WILL LINGER THROUGH THE DAY ON SATURDAY.
RAIN SHOWERS DEVELOPING OVER THE SOUTHERN THIRD OF LAKE MICHIGAN
COULD PRODUCE AN ISOLATED WATERSPOUT OR TWO, THOUGH WIDESPREAD
WATERSPOUT ACTIVITY IS NOT ANTICIPATED AT THIS TIME. NORTHERLY WINDS
WILL DECREASE SATURDAY NIGHT AS HIGH PRESSURE MOVES ACROSS THE OPEN
WATERS.
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 THE HUDSON BAY. GALES ARE POSSIBLE DURING
THIS TIME FRAME, WITH TRENDS BEING MONITORED FOR POTENTIAL GALE
WARNINGS 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.
LMZ261-362-364-366-563-565-567-868-311515-
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-
301 AM CDT FRI OCT 31 2025
SHEBOYGAN WI TO PENTWATER MI NORTH...
TODAY
NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH. ISOLATED
RAIN SHOWERS. WAVES 2 TO 4 FT.
TONIGHT
NORTH WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT.
SCATTERED RAIN SHOWERS. WAVES 1 TO 3 FT.
SATURDAY
NORTHEAST WINDS 10 TO 15 KT BECOMING NORTH. 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 35 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.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-311515-
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-
301 AM CDT FRI OCT 31 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH...
TODAY
NORTHWEST WINDS 10 TO 20 KT. ISOLATED RAIN SHOWERS THIS
MORNING. WAVES 3 TO 5 FT.
TONIGHT
NORTHWEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO
15 KT. ISOLATED RAIN SHOWERS IN THE EVENING, THEN SCATTERED 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.
LMZ761-311515-
MAFOR 3110/
MICHIGAN NORTH 11820 11720 12820 11820 19826 13810 19816. WAVES 1
TO 3 FEET BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO 3 FEET
TODAY. WAVES 1 TO 3 FEET TONIGHT.
MICHIGAN SOUTH 14720 12710 12710 19716. WAVES 2 TO 4 FEET
BUILDING TO 3 TO 5 FEET TODAY. WAVES 2 TO 4 FEET SUBSIDING TO 1
TO 3 FEET TONIGHT.
QUIGLEY
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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