539
FZUS63 KMKX 132026
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
326 PM CDT MON APR 13 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 29.5 INCHES OVER NEBRASKA WILL CONTINUE TO
LIFT INTO THE UPPER GREAT LAKES REGION THIS EVENING WITH A WARM
FRONT EXTENDING OUT AHEAD OF IT. WILL SEE SHOWER AND THUNDERSTORM
ACTIVITY ALONG THIS BOUNDARY TONIGHT AS THE LOW PRESSURE LIFTS
EAST-NORTHEASTWARD. EXPECT LIGHT WINDS ACROSS THE LAKE TO VARY
WITH THE FRONT AND PASSING LOW. THEN EXPECTING ANOTHER A COUPLE
PASSING LOW PRESSURE SYSTEM TO DEVELOP IN THE PLAINS AND TRACK
ACROSS LAKE MICHIGAN AGAIN ON TUESDAY AND WEDNESDAY. EACH SYSTEM
WILL BRING A CHANCE FOR SHOWERS AND THUNDERSTORMS THROUGH THE
MIDDLE OF THE WEEK. AREAS OF DENSE FOG WILL LIKELY OCCUR AT TIMES
DUE TO A RELATIVELY MILD AND HUMID AIRMASS OVER THE COLD WATERS
PAIRED WITH LIGHTER WINDS.
LMZ261-362-364-366-563-565-567-868-140315-
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-
326 PM CDT MON APR 13 2026
SHEBOYGAN WI TO PENTWATER MI NORTH...
..DENSE FOG ADVISORY IN EFFECT UNTIL 7 AM CDT TUESDAY
TONIGHT
EAST WINDS 10 TO 20 KT BECOMING SOUTHEAST 15 TO 25 KT.
PATCHY DENSE FOG THIS EVENING, THEN AREAS OF DENSE FOG OVERNIGHT.
RAIN SHOWERS WITH A CHANCE OF THUNDERSTORMS. WAVES 1 TO 3 FT
BUILDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
TUESDAY
WEST WINDS 10 TO 20 KT BACKING TO SOUTH 10 TO 15 KT.
PATCHY FOG IN THE MORNING, THEN PATCHY DENSE FOG IN THE
AFTERNOON. SLIGHT CHANCE OF RAIN SHOWERS IN THE MORNING, THEN
SLIGHT CHANCE OF RAIN SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT.
TUESDAY NIGHT
NORTHEAST WINDS 10 TO 15 KT DIMINISHING TO 5 TO
10 KT. PATCHY DENSE FOG IN THE EVENING. CHANCE OF RAIN SHOWERS.
WAVES 2 TO 4 FT.
WEDNESDAY
NORTHEAST WINDS 5 TO 10 KT. CHANCE OF RAIN SHOWERS
IN THE AFTERNOON. WAVES 1 TO 3 FT.
WEDNESDAY NIGHT
NORTHEAST WINDS 5 TO 10 KT BECOMING EAST 10 TO
15 KT. CHANCE OF RAIN SHOWERS IN THE EVENING, THEN RAIN SHOWERS
LIKELY OVERNIGHT. WAVES 1 TO 3 FT.
THURSDAY
EAST WINDS 10 TO 15 KT BACKING TO NORTHWEST. CHANCE
OF RAIN SHOWERS. WAVES 2 TO 4 FT.
THURSDAY NIGHT
NORTH WINDS 10 TO 15 KT BECOMING NORTHEAST.
WAVES 2 TO 4 FT.
FRIDAY
EAST WINDS 10 TO 15 KT BECOMING SOUTHEAST 10 TO 20 KT.
WAVES 1 TO 3 FT BUILDING TO 2 TO 4 FT.
SATURDAY
SOUTH WINDS TO 30 KT BECOMING SOUTHWEST. RAIN SHOWERS
LIKELY. WAVES 8 TO 11 FT OCCASIONALLY TO 14 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-140315-
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-
326 PM CDT MON APR 13 2026
SHEBOYGAN WI TO PENTWATER MI SOUTH...
TONIGHT
SOUTH WINDS 10 TO 20 KT INCREASING TO 30 KT LATE THIS
EVENING, THEN BECOMING SOUTH TO 30 KT AFTER MIDNIGHT BECOMING
SOUTHWEST LATE. PATCHY FOG. CHANCE OF RAIN SHOWERS AND
THUNDERSTORMS. WAVES 2 TO 4 FT BUILDING TO 4 TO 7 FT OCCASIONALLY
TO 9 FT.
TUESDAY
SOUTHWEST WINDS 15 TO 25 KT BECOMING SOUTH 10 TO
20 KT. PATCHY FOG IN THE MORNING, THEN PATCHY DENSE FOG IN THE
AFTERNOON. SLIGHT CHANCE OF RAIN SHOWERS IN THE MORNING, THEN
CHANCE OF RAIN SHOWERS AND THUNDERSTORMS IN THE AFTERNOON. WAVES
4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 4 TO 6 FT
OCCASIONALLY TO 8 FT.
TUESDAY NIGHT
SOUTH WINDS 10 TO 20 KT BECOMING SOUTHWEST. RAIN
SHOWERS WITH A CHANCE OF THUNDERSTORMS IN THE EVENING, THEN RAIN
SHOWERS LIKELY OVERNIGHT. WAVES 2 TO 4 FT.
WEDNESDAY
SOUTHWEST WINDS 10 TO 15 KT BECOMING SOUTH. CHANCE
OF RAIN SHOWERS IN THE MORNING, THEN RAIN SHOWERS LIKELY IN THE
AFTERNOON. WAVES 2 TO 4 FT.
WEDNESDAY NIGHT
SOUTHEAST WINDS 10 TO 15 KT BECOMING SOUTH
10 TO 20 KT. RAIN SHOWERS WITH A CHANCE OF THUNDERSTORMS IN THE
EVENING, THEN RAIN SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS
OVERNIGHT. WAVES 2 TO 4 FT.
THURSDAY
SOUTHWEST WINDS 10 TO 20 KT. RAIN SHOWERS LIKELY.
WAVES 2 TO 4 FT.
THURSDAY NIGHT
NORTHWEST WINDS 10 TO 15 KT BECOMING NORTH.
WAVES 2 TO 4 FT.
FRIDAY
EAST WINDS 10 TO 15 KT BECOMING SOUTHEAST 10 TO 20 KT.
WAVES 1 TO 3 FT BUILDING TO 2 TO 4 FT.
SATURDAY
SOUTH WINDS TO 30 KT BECOMING SOUTHWEST. RAIN SHOWERS
LIKELY. WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT.
LMZ761-140315-
MAFOR 1322/
MICHIGAN NORTH 11214 11229 19224 12336 19334 11530 19534 11720
11410 11410 19414. WAVES 1 TO 3 FEET BUILDING TO 3 TO 6 FEET
TONIGHT. WAVES 3 TO 6 FEET SUBSIDING TO 2 TO 4 FEET TUESDAY.
MICHIGAN SOUTH 11420 11430 11440 11540 12530 11520 11420 19424. A
CHANCE OF SHOWERS AND THUNDERSTORMS TONIGHT AND TUESDAY
AFTERNOON. WAVES 1 TO 3 FEET BUILDING TO 3 TO 6 FEET TONIGHT.
WAVES 3 TO 6 FEET SUBSIDING TO 2 TO 4 FEET TUESDAY.
WAGNER
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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