999
FZUS63 KMKX 171937
GLFLM
OPEN LAKE FORECAST FOR LAKE MICHIGAN
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
237 PM CDT WED SEP 17 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
LOW PRESSURE AROUND 29.4 INCHES WILL CONTINUE EASTWARD ACROSS
NORTHERN QUEBEC CANADA TODAY, WITH HIGH PRESSURE AROUND 30.3
INCHES MOVING INTO ONTARIO THROUGH FRIDAY.
WINDS REMAIN NEARLY CALM THROUGH TONIGHT, WITH A LIGHT NORTHEAST
WIND DEVELOPING OVER THE NORTHERN HALF OF THE LAKE IN RESPONSE TO
A WEAK BACKDOOR COLD FRONT. THIS FRONT SAGS SOUTHWARD ACROSS THE
REST OF THE LAKE THURSDAY, BRINGING ROUGHLY 15 KT NORTH TO
NORTHEAST WINDS BEHIND IT. LIGHT NORTHEAST WINDS CONTINUE INTO
FRIDAY, BECOMING BREEZY AND VEERING SOUTHEAST FRIDAY NIGHT THROUGH
SATURDAY MORNING AS THE AFOREMENTIONED HIGH PRESSURE SYSTEM
STRENGTHENS TO AROUND 30.4 INCHES AND APPROACHES SOUTHERN
ONTARIO/QUEBEC AND LOW PRESSURE AROUND 29.9 INCHES MOVES INTO THE
DAKOTAS / MINNESOTA. THERE WILL BE CHANCES FOR THUNDERSTORMS
AT TIMES THIS WEEKEND.
LMZ261-362-364-366-563-565-567-868-180315-
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-
237 PM CDT WED SEP 17 2025
SHEBOYGAN WI TO PENTWATER MI NORTH...
TONIGHT
SOUTHWEST WINDS 10 TO 15 KT BACKING TO NORTHEAST.
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS THIS EVENING, THEN
SLIGHT CHANCE OF SHOWERS OVERNIGHT. WAVES 1 TO 2 FT.
THURSDAY
NORTHEAST WINDS 10 TO 15 KT BECOMING NORTH. WAVES
1 TO 2 FT.
THURSDAY NIGHT
NORTHEAST WINDS 10 TO 15 KT. WAVES 1 TO 3 FT.
FRIDAY
EAST WINDS 10 TO 15 KT BECOMING NORTHEAST 10 TO 20 KT.
WAVES 1 TO 3 FT.
FRIDAY NIGHT
EAST WINDS 10 TO 20 KT BECOMING SOUTHEAST. WAVES
2 TO 4 FT BUILDING TO 3 TO 5 FT.
SATURDAY
SOUTHEAST WINDS 10 TO 20 KT. WAVES 3 TO 5 FT.
SATURDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KT BECOMING SOUTH.
CHANCE OF SHOWERS. WAVES 2 TO 4 FT.
SUNDAY
SOUTH WINDS 10 TO 20 KT. CHANCE OF SHOWERS. WAVES 2 TO
4 FT.
MONDAY
SOUTH WINDS 10 TO 20 KT. CHANCE OF SHOWERS. WAVES 2 TO
4 FT.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-180315-
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-
237 PM CDT WED SEP 17 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH...
TONIGHT
NORTHWEST WINDS 10 TO 15 KT BACKING TO SOUTHEAST LATE
THIS EVENING, THEN BECOMING SOUTHEAST 5 TO 10 KT AFTER MIDNIGHT
DIMINISHING TO LESS THAN 10 KT LATE. WAVES 1 TO 2 FT.
THURSDAY
SOUTH WINDS 5 TO 10 KT BACKING TO NORTH. WAVES 1 TO
2 FT.
THURSDAY NIGHT
NORTH WINDS 10 TO 15 KT BECOMING EAST. WAVES
1 TO 3 FT.
FRIDAY
EAST WINDS 10 TO 15 KT BECOMING NORTHEAST. WAVES 1 TO
3 FT.
FRIDAY NIGHT
NORTHEAST WINDS 10 TO 20 KT BECOMING EAST 15 TO
25 KT. WAVES 2 TO 4 FT BUILDING TO 4 TO 6 FT OCCASIONALLY TO
8 FT.
SATURDAY
SOUTHEAST WINDS 10 TO 20 KT. WAVES 4 TO 6 FT
OCCASIONALLY TO 8 FT SUBSIDING TO 3 TO 5 FT.
SATURDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KT. CHANCE OF SHOWERS.
WAVES 2 TO 4 FT.
SUNDAY
SOUTH WINDS 10 TO 20 KT. CHANCE OF SHOWERS. WAVES 2 TO
4 FT.
MONDAY
SOUTH WINDS 10 TO 20 KT. CHANCE OF SHOWERS. WAVES 2 TO
4 FT.
LMZ761-180315-
MAFOR 1722/
MICHIGAN NORTH 12510 11810 13110 12810. WAVES 2 FEET OR LESS.
MICHIGAN SOUTH 11610 14300 11500 11800 11810. WAVES 2 FEET OR
LESS.
SHEPPARD
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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