645
FZUS63 KMKX 061927
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
227 PM CDT MON APR 6 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
NORTHWEST GALES ARE EXPECTED OVER THE NORTH HALF OF THE LAKE THIS
AFTERNOON AND EARLY EVENING, AS LOW PRESSURE AROUND 29.7 INCHES
TRACKS ACROSS THE NORTHERN GREAT LAKES, REACHING THE LOWER GREAT
LAKES LATE TONIGHT. A GALE WARNING IS NOW IN EFFECT. SOME MODERATE
FREEZING SPRAY IS POSSIBLE OVER THE NORTHERN HALF OF THE LAKE
THIS EVENING.
WINDS WILL DECREASE LATE TONIGHT INTO TUESDAY AS HIGH PRESSURE
AROUND 30.5 INCHES MOVES ACROSS CENTRAL LAKE MICHIGAN TUESDAY
MORNING INTO THE EARLY AFTERNOON.
LOW PRESSURE AROUND 29.5 INCHES WILL THEN TRACK ALONG THE
CANADIAN BORDER TUESDAY NIGHT AND WEDNESDAY, THEN TRACK NORTH OF
LAKE SUPERIOR WEDNESDAY NIGHT INTO THURSDAY MORNING. THIS WILL
RESULT IN BREEZY SOUTH WINDS WHICH MAY INCREASE TO GALE FORCE.
MUCH WEAKER WINDS WILL THEN TAKE HOLD BY THURSDAY AFTERNOON AND
THE REMAINDER OF THE WEEK.
LMZ261-362-364-366-563-565-070430-
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-
227 PM CDT MON APR 6 2026
TWO RIVERS WI TO MANISTEE MI NORTH...
..GALE WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING
TONIGHT
NORTH GALES TO 35 KT DIMINISHING TO 10 TO 20 KT.
FREEZING SPRAY THIS EVENING. SCATTERED SNOW SHOWERS THIS EVENING.
WAVES 7 TO 10 FT OCCASIONALLY TO 13 FT SUBSIDING TO 6 TO 9 FT
OCCASIONALLY TO 12 FT.
TUESDAY
NORTHWEST WINDS 10 TO 15 KT BACKING TO SOUTHWEST 10 TO
20 KT. WAVES 3 TO 5 FT SUBSIDING TO 1 TO 3 FT.
TUESDAY NIGHT
SOUTH WINDS 10 TO 20 KT INCREASING TO 15 TO
25 KT. WAVES 1 TO 3 FT BUILDING TO 4 TO 6 FT OCCASIONALLY TO
8 FT.
WEDNESDAY
SOUTH WINDS TO 30 KT INCREASING TO GALES TO 35 KT.
CHANCE OF RAIN AND SNOW SHOWERS IN THE MORNING. WAVES 8 TO 12 FT
OCCASIONALLY TO 16 FT BUILDING TO 10 TO 14 FT OCCASIONALLY TO
18 FT.
WEDNESDAY NIGHT
SOUTH GALES TO 40 KT BECOMING SOUTHWEST. RAIN
SHOWERS. WAVES 10 TO 14 FT OCCASIONALLY TO 18 FT.
THURSDAY
SOUTHWEST GALES TO 35 KT DIMINISHING TO 30 KT. WAVES
8 TO 11 FT OCCASIONALLY TO 14 FT SUBSIDING TO 5 TO 8 FT
OCCASIONALLY TO 10 FT.
THURSDAY NIGHT
NORTHWEST WINDS 10 TO 20 KT VEERING TO
NORTHEAST 5 TO 10 KT. CHANCE OF RAIN SHOWERS. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT SUBSIDING TO 2 TO 4 FT.
FRIDAY
NORTH WINDS 5 TO 10 KT. WAVES 1 TO 3 FT.
SATURDAY
SOUTHEAST WINDS 5 TO 10 KT BECOMING SOUTH 10 TO
15 KT. WAVES 1 TO 3 FT.
LMZ567-868-070430-
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-
227 PM CDT MON APR 6 2026
TWO RIVERS WI TO MANISTEE MI SOUTH TO SHEBOYGAN WI TO PENTWATER
MI...
TONIGHT
NORTH WINDS TO 30 KT DIMINISHING TO 10 TO 20 KT.
SCATTERED SNOW SHOWERS THIS EVENING. WAVES 8 TO 11 FT
OCCASIONALLY TO 14 FT SUBSIDING TO 7 TO 10 FT OCCASIONALLY TO
13 FT.
TUESDAY
NORTH WINDS 10 TO 15 KT BACKING TO SOUTH. WAVES 4 TO
6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 1 TO 3 FT.
TUESDAY NIGHT
SOUTH WINDS 10 TO 15 KT INCREASING TO 15 TO
25 KT. WAVES 1 TO 3 FT BUILDING TO 4 TO 6 FT OCCASIONALLY TO
8 FT.
WEDNESDAY
SOUTH WINDS TO 30 KT INCREASING TO GALES TO 35 KT.
CHANCE OF RAIN SHOWERS IN THE MORNING. WAVES 10 TO 14 FT
OCCASIONALLY TO 18 FT.
WEDNESDAY NIGHT
SOUTH GALES TO 40 KT BECOMING SOUTHWEST. RAIN
SHOWERS IN THE EVENING, THEN RAIN SHOWERS LIKELY OVERNIGHT. WAVES
10 TO 14 FT OCCASIONALLY TO 18 FT.
THURSDAY
SOUTHWEST WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.
WAVES 8 TO 11 FT OCCASIONALLY TO 14 FT SUBSIDING TO 5 TO 8 FT
OCCASIONALLY TO 10 FT.
THURSDAY NIGHT
WEST WINDS 10 TO 15 KT VEERING TO NORTHEAST
5 TO 10 KT. CHANCE OF RAIN SHOWERS. WAVES 3 TO 5 FT SUBSIDING TO
2 TO 4 FT.
FRIDAY
NORTH WINDS 5 TO 10 KT INCREASING TO 10 TO 15 KT.
CHANCE OF RAIN SHOWERS. WAVES 1 TO 3 FT.
SATURDAY
EAST WINDS 5 TO 10 KT. WAVES 1 TO 3 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-070430-
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-
227 PM CDT MON APR 6 2026
SHEBOYGAN WI TO PENTWATER MI SOUTH...
TONIGHT
NORTH WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.
ISOLATED SNOW SHOWERS. WAVES 8 TO 11 FT OCCASIONALLY TO 14 FT
SUBSIDING TO 6 TO 9 FT OCCASIONALLY TO 12 FT.
TUESDAY
NORTH WINDS 10 TO 20 KT DIMINISHING TO 5 TO 10 KT LATE
IN THE MORNING, THEN BECOMING NORTHEAST EARLY IN THE AFTERNOON
BECOMING NORTHEAST 5 TO 10 KT LATE. ISOLATED SNOW SHOWERS IN THE
MORNING. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT SUBSIDING TO 2 TO
4 FT.
TUESDAY NIGHT
SOUTHEAST WINDS 10 TO 15 KT INCREASING TO 10 TO
20 KT AFTER MIDNIGHT, THEN BECOMING SOUTH 15 TO 25 KT LATE. WAVES
2 TO 4 FT BUILDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.
WEDNESDAY
SOUTH WINDS TO 30 KT INCREASING TO GALES TO 35 KT.
WAVES 8 TO 11 FT OCCASIONALLY TO 14 FT BUILDING TO 8 TO 12 FT
OCCASIONALLY TO 16 FT.
WEDNESDAY NIGHT
SOUTH GALES TO 35 KT. CHANCE OF RAIN SHOWERS
IN THE EVENING, THEN RAIN SHOWERS LIKELY OVERNIGHT. WAVES 8 TO
12 FT OCCASIONALLY TO 16 FT.
THURSDAY
SOUTHWEST WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.
CHANCE OF RAIN SHOWERS. WAVES 8 TO 11 FT OCCASIONALLY TO 14 FT
SUBSIDING TO 5 TO 8 FT OCCASIONALLY TO 10 FT.
THURSDAY NIGHT
SOUTH WINDS 10 TO 20 KT BACKING TO EAST 5 TO
10 KT. CHANCE OF RAIN SHOWERS. WAVES 3 TO 5 FT SUBSIDING TO 2 TO
4 FT.
FRIDAY
NORTH WINDS 10 TO 15 KT. CHANCE OF RAIN SHOWERS. WAVES
1 TO 3 FT.
SATURDAY
EAST WINDS 5 TO 10 KT BECOMING NORTHEAST. WAVES 2 TO
4 FT.
LMZ761-070430-
MAFOR 0622/
MICHIGAN NORTH...GALE WARNING IN EFFECT...11850 19857 12840 11820
11720 11700 11610 11520. WAVES 6 TO 10 FEET SUBSIDING TO 4 TO 7
FEET TONIGHT. WAVES 3 TO 5 FEET SUBSIDING TO 2 FEET OR LESS
TUESDAY.
MICHIGAN SOUTH 11840 19847 11840 12830 11820 11810 11800 11100.
WAVES 5 TO 8 FEET BUILDING TO 6 TO 10 FEET TONIGHT. WAVES 4 TO 7
FEET SUBSIDING TO 1 TO 3 FEET TUESDAY.
GEHRING
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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