291
FZUS63 KMKX 210803
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
303 AM CDT SAT MAR 21 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
LIGHT WINDS EARLY THIS MORNING WILL CONTINUE AS HIGH PRESSURE
AROUND 30.3 INCHES MOVES FROM JAMES BAY TO MICHIGAN TO THE MID
ATLANTIC. AS THIS HIGH MOVES EAST OF THE LAKE TODAY, WINDS WILL
SHIFT TO SOUTHEAST TO SOUTH.
MEANWHILE, LOW PRESSURE AROUND 29.5 INCHES WILL DEVELOP IN
EASTERN WYOMING THIS MORNING AND MOVE EAST SOUTHEAST TOWARD
CENTRAL ILLINOIS/INDIANA BY SUNDAY. AS THIS LOW PASSES SOUTH OF
THE LAKE IT IS EXPECTED TO DEEPEN TO AROUND 29.4 INCHES. WINDS
WILL SHIFT TO THE NORTH AND NORTHEAST AND BECOME GUSTY LATER
TONIGHT INTO SUNDAY MORNING. A FEW NORTHERLY GALES ARE POSSIBLE
SUNDAY, MAINLY OVER SOUTHERN PORTIONS OF THE LAKE. HIGH PRESSURE
AROUND 30.4 INCHES SHOULD THEN BRING DECREASING WINDS FOR MONDAY.
LMZ261-362-364-366-563-565-567-868-211530-
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-
303 AM CDT SAT MAR 21 2026
SHEBOYGAN WI TO PENTWATER MI NORTH...
TODAY
SOUTHEAST WINDS 5 TO 10 KT BECOMING SOUTH 10 TO 20 KT.
SLIGHT CHANCE OF SNOW THIS MORNING, THEN SLIGHT CHANCE OF RAIN
THIS AFTERNOON. PATCHY FOG THIS AFTERNOON. WAVES 1 FT OR LESS
BUILDING TO 3 TO 5 FT.
TONIGHT
SOUTH WINDS 10 TO 20 KT BACKING TO NORTH. CHANCE OF
RAIN OVERNIGHT. WAVES 3 TO 5 FT.
SUNDAY
NORTH WINDS 10 TO 20 KT INCREASING TO 30 KT. WAVES 4 TO
6 FT OCCASIONALLY TO 8 FT BUILDING TO 7 TO 10 FT OCCASIONALLY TO
13 FT.
SUNDAY NIGHT
NORTH WINDS TO 30 KT DIMINISHING TO 10 TO 20 KT
OVERNIGHT. WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT SUBSIDING TO
4 TO 7 FT OCCASIONALLY TO 9 FT.
MONDAY
NORTH WINDS 10 TO 20 KT BECOMING NORTHWEST 10 TO 15 KT.
WAVES 3 TO 5 FT SUBSIDING TO 1 TO 3 FT.
MONDAY NIGHT
SOUTH WINDS 10 TO 15 KT INCREASING TO 15 TO
25 KT. WAVES 1 TO 2 FT BUILDING TO 2 TO 4 FT.
TUESDAY
SOUTHWEST WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.
WEDNESDAY
EAST WINDS 15 TO 25 KT DIMINISHING TO 10 TO 20 KT.
WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT SUBSIDING TO 4 TO 7 FT
OCCASIONALLY TO 9 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-211530-
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-
303 AM CDT SAT MAR 21 2026
SHEBOYGAN WI TO PENTWATER MI SOUTH...
TODAY
SOUTHEAST WINDS 5 TO 10 KT INCREASING TO 10 TO 15 KT
LATE THIS MORNING, THEN BECOMING SOUTH 10 TO 20 KT THIS
AFTERNOON. WAVES 1 TO 3 FT BUILDING TO 3 TO 5 FT.
TONIGHT
SOUTH WINDS 10 TO 20 KT VEERING TO NORTHWEST. WAVES
3 TO 5 FT.
SUNDAY
NORTH WINDS 10 TO 20 KT INCREASING TO 30 KT. CHANCE OF
RAIN. WAVES 3 TO 5 FT BUILDING TO 8 TO 12 FT OCCASIONALLY TO
16 FT.
SUNDAY NIGHT
NORTH WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.
WAVES 8 TO 12 FT OCCASIONALLY TO 16 FT SUBSIDING TO 7 TO 10 FT
OCCASIONALLY TO 13 FT.
MONDAY
NORTH WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT.
WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 3 TO 5 FT.
MONDAY NIGHT
EAST WINDS 10 TO 15 KT BECOMING SOUTHEAST 10 TO
20 KT. WAVES 2 TO 4 FT.
TUESDAY
SOUTH WINDS 15 TO 25 KT. WAVES 3 TO 5 FT.
WEDNESDAY
EAST WINDS 15 TO 25 KT BECOMING SOUTHEAST 10 TO
20 KT. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT SUBSIDING TO 4 TO
7 FT OCCASIONALLY TO 9 FT.
LMZ761-211530-
MAFOR 2110/
MICHIGAN NORTH 11200 11300 11310 12420 11410 11710 11810. A
CHANCE OF RAIN OVERNIGHT. WAVES 2 FEET OR LESS BUILDING TO 2 TO 4
FEET TODAY. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET TONIGHT.
WAVE HEIGHTS ARE FOR ICE FREE AREAS.
MICHIGAN SOUTH 11200 11310 11410 12420 11510 11610 11710. WAVES 2
FEET OR LESS BUILDING TO 2 TO 4 FEET TODAY. WAVES 2 TO 4 FEET
SUBSIDING TO 1 TO 3 FEET TONIGHT.
PATTERSON
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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