140
FZUS63 KMKX 082018
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
318 PM CDT WED APR 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
LOW PRESSURE AROUND 29.6 INCHES TRACKING ALONG THE NORTHERN GREAT
PLAINS AND CANADIAN BORDER WILL TRACK NORTH OF LAKE SUPERIOR
TONIGHT INTO THURSDAY MORNING. THIS WILL RESULT IN CONTINUED GALES
INTO TONIGHT ACROSS THE NORTHERN 3/4 OF THE LAKE.
MUCH LIGHTER WESTERLY WINDS ARE THEN EXPECTED THURSDAY IN THE
WAKE OF A COLD FRONT. LIGHT AND VARIABLE WINDS WILL PREVAIL FRIDAY
INTO SATURDAY, UNTIL BREEZY SOUTHERLY WINDS RETURN LATE IN THE
WEEKEND.
LMZ261-362-364-366-563-565-567-868-090345-
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-
318 PM CDT WED APR 8 2026
SHEBOYGAN WI TO PENTWATER MI NORTH...
..GALE WARNING IN EFFECT THROUGH LATE TONIGHT
TONIGHT
SOUTH GALES TO 40 KT BECOMING SOUTHWEST GALES TO 35 KT
AFTER MIDNIGHT, THEN DIMINISHING TO 15 TO 25 KT LATE. RAIN
SHOWERS. WAVES 10 TO 14 FT OCCASIONALLY TO 18 FT SUBSIDING TO
6 TO 9 FT OCCASIONALLY TO 12 FT.
THURSDAY
SOUTHWEST WINDS 15 TO 25 KT BECOMING WEST 10 TO
20 KT. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 2 TO
4 FT.
THURSDAY NIGHT
WEST WINDS 10 TO 15 KT VEERING TO EAST. CHANCE
OF RAIN SHOWERS. WAVES 1 TO 3 FT SUBSIDING TO 1 TO 2 FT.
FRIDAY
NORTH WINDS 5 TO 10 KT BECOMING NORTHWEST. WAVES 1 FT
OR LESS.
FRIDAY NIGHT
NORTHEAST WINDS 5 TO 10 KT VEERING TO SOUTH.
WAVES 1 FT OR LESS.
SATURDAY
SOUTH WINDS 5 TO 10 KT. WAVES 1 TO 2 FT.
SATURDAY NIGHT
SOUTHEAST WINDS 10 TO 15 KT INCREASING TO 15 TO
25 KT. RAIN SHOWERS LIKELY. WAVES 1 TO 3 FT BUILDING TO 4 TO 7 FT
OCCASIONALLY TO 9 FT.
SUNDAY
SOUTH WINDS TO 30 KT. RAIN SHOWERS LIKELY WITH A CHANCE
OF THUNDERSTORMS. WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT BUILDING
TO 7 TO 10 FT OCCASIONALLY TO 13 FT.
MONDAY
SOUTHWEST GALES TO 35 KT DIMINISHING TO 30 KT. CHANCE
OF SHOWERS. WAVES 8 TO 12 FT OCCASIONALLY TO 16 FT SUBSIDING TO
8 TO 11 FT OCCASIONALLY TO 14 FT.
LMZ669-671-673-675-870-872-874-876-090345-
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 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-
318 PM CDT WED APR 8 2026
SHEBOYGAN WI TO PENTWATER MI SOUTH TO WINTHROP HARBOR IL TO SOUTH
HAVEN MI...
..GALE WARNING IN EFFECT THROUGH LATE TONIGHT
TONIGHT
SOUTH GALES TO 35 KT BECOMING SOUTHWEST TO 30 KT. RAIN
SHOWERS LIKELY OVERNIGHT. WAVES 8 TO 11 FT OCCASIONALLY TO 14 FT
SUBSIDING TO 6 TO 9 FT OCCASIONALLY TO 12 FT.
THURSDAY
SOUTHWEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO
15 KT. CHANCE OF RAIN SHOWERS IN THE MORNING. WAVES 4 TO 7 FT
OCCASIONALLY TO 9 FT SUBSIDING TO 2 TO 4 FT.
THURSDAY NIGHT
EAST WINDS LESS THAN 10 KT INCREASING TO 5 TO
10 KT LATE IN THE EVENING, THEN INCREASING TO 10 TO 15 KT AFTER
MIDNIGHT BECOMING NORTHEAST LATE. CHANCE OF RAIN SHOWERS IN THE
EVENING, THEN RAIN SHOWERS OVERNIGHT. WAVES 1 TO 2 FT.
FRIDAY
NORTH WINDS 5 TO 10 KT INCREASING TO 10 TO 15 KT.
CHANCE OF RAIN SHOWERS IN THE MORNING. WAVES 1 TO 2 FT.
FRIDAY NIGHT
NORTHEAST WINDS 5 TO 10 KT. WAVES 1 TO 2 FT.
SATURDAY
EAST WINDS 5 TO 10 KT BECOMING SOUTHEAST. WAVES 1 TO
2 FT.
SATURDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KT INCREASING TO 15 TO
25 KT. CHANCE OF RAIN SHOWERS AND THUNDERSTORMS. WAVES 1 TO 3 FT
BUILDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT.
SUNDAY
SOUTH WINDS TO 30 KT. CHANCE OF RAIN SHOWERS. WAVES
6 TO 9 FT OCCASIONALLY TO 12 FT BUILDING TO 7 TO 10 FT
OCCASIONALLY TO 13 FT.
MONDAY
SOUTHWEST WINDS TO 30 KT BECOMING SOUTH. CHANCE OF
SHOWERS. WAVES 8 TO 12 FT OCCASIONALLY TO 16 FT SUBSIDING TO 7 TO
10 FT OCCASIONALLY TO 13 FT.
LMZ080-777-779-878-090345-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 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 ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO
MID LAKE-
318 PM CDT WED APR 8 2026
WINTHROP HARBOR IL TO SOUTH HAVEN MI SOUTH...
TONIGHT
SOUTH WINDS TO 30 KT BECOMING SOUTHWEST. CHANCE OF
SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS OVERNIGHT. WAVES 4 TO
6 FT OCCASIONALLY TO 8 FT BUILDING TO 4 TO 7 FT OCCASIONALLY TO
9 FT.
THURSDAY
SOUTHWEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO
15 KT LATE IN THE MORNING, THEN DIMINISHING TO 5 TO 10 KT EARLY
IN THE AFTERNOON BACKING TO SOUTHEAST LATE. CHANCE OF RAIN
SHOWERS IN THE MORNING. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT
SUBSIDING TO 1 TO 3 FT.
THURSDAY NIGHT
NORTHEAST WINDS 5 TO 10 KT INCREASING TO 10 TO
15 KT. CHANCE OF RAIN SHOWERS IN THE EVENING, THEN RAIN SHOWERS
OVERNIGHT. WAVES 1 TO 2 FT.
FRIDAY
NORTHEAST WINDS 10 TO 15 KT BECOMING NORTH. RAIN
SHOWERS IN THE MORNING, THEN CHANCE OF RAIN SHOWERS IN THE
AFTERNOON. WAVES 1 TO 2 FT.
FRIDAY NIGHT
NORTHEAST WINDS 5 TO 10 KT. WAVES 1 TO 2 FT.
SATURDAY
EAST WINDS 5 TO 10 KT BECOMING NORTHEAST. WAVES 1 FT
OR LESS.
SATURDAY NIGHT
EAST WINDS 10 TO 15 KT BECOMING SOUTHEAST 10 TO
20 KT. CHANCE OF RAIN SHOWERS AND THUNDERSTORMS. WAVES 1 TO 2 FT
BUILDING TO 2 TO 4 FT.
SUNDAY
SOUTH WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.
CHANCE OF SHOWERS. WAVES 3 TO 5 FT.
MONDAY
SOUTHWEST WINDS TO 30 KT. CHANCE OF SHOWERS. WAVES 5 TO
8 FT OCCASIONALLY TO 10 FT SUBSIDING TO 4 TO 7 FT OCCASIONALLY TO
9 FT.
LMZ761-090345-
MAFOR 0822/
MICHIGAN NORTH...GALE WARNING IN EFFECT...11450 11456 11556 11546
11530 12630 11620. WAVES 10 TO 14 FEET SUBSIDING TO 5 TO 8 FEET
TONIGHT. WAVES 3 TO 6 FEET SUBSIDING TO 1 TO 3 FEET THURSDAY.
MICHIGAN SOUTH...GALE WARNING IN EFFECT...13450 11556 11530 11510
11610 11510. WAVES 7 TO 11 FEET SUBSIDING TO 5 TO 8 FEET TONIGHT.
WAVES 3 TO 6 FEET SUBSIDING TO 1 TO 3 FEET THURSDAY.
DDV
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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