278
FZUS63 KMKX 200146
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
846 PM CDT Sat Jul 19 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...

Scattered showers and weak thunderstorms will impact the southern
half of Lake Michigan into the evening. Winds will become
northerly overnight as a cold front moves across the lake. High
pressure of 30 inches will move across Lake Superior on Sunday.
Winds will shift to the east on Monday as the high moves into
Ontario.

Winds will increase to around 20 knots and become southeast on
Tuesday as low pressure of 29.5 inches approaches from the central
plains. There are chances for storms Wednesday through Friday
along a frontal boundary that sets up across the lake. South to
southwest winds will remain elevated Wednesday and Thursday ahead
of the front.

LMZ261-362-364-366-563-565-567-868-200930-
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-
846 PM CDT Sat Jul 19 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...North winds 10 to 15 kt increasing to 10 to
20 kt. Waves 2 to 4 ft.
.SUNDAY...North winds 10 to 20 kt. Waves 2 to 4 ft.
.SUNDAY NIGHT...North winds 10 to 20 kt becoming northeast 10 to
15 kt. Waves 1 to 3 ft.
.MONDAY...East winds 10 to 15 kt becoming northeast. Waves 1 to
2 ft.
.MONDAY NIGHT...East winds 10 to 15 kt becoming southeast 10 to
20 kt. Waves 1 to 2 ft building to 1 to 3 ft.
.TUESDAY...South winds 10 to 20 kt. Waves 3 to 5 ft.
.TUESDAY NIGHT...South winds 10 to 20 kt. Chance of showers.
Waves 3 to 5 ft.
.WEDNESDAY...South winds 15 to 25 kt. Chance of showers and
thunderstorms. Waves 3 to 5 ft.
.THURSDAY...Southwest winds 10 to 20 kt. Chance of showers. Waves
2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-200930-
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-
846 PM CDT Sat Jul 19 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...Southwest winds 10 to 15 kt veering to north
10 to 20 kt. Slight chance of showers and thunderstorms through
early evening. Waves 2 to 4 ft.
.SUNDAY...North winds 10 to 20 kt. Chance of showers in the
morning, then slight chance of showers in the afternoon. Waves
2 to 4 ft.
.SUNDAY NIGHT...North winds 10 to 20 kt becoming east. Waves 2 to
4 ft.
.MONDAY...East winds 10 to 20 kt becoming northeast 10 to 15 kt.
Waves 2 to 4 ft.
.MONDAY NIGHT...Northeast winds 10 to 15 kt becoming southeast
10 to 20 kt. Waves 1 to 2 ft building to 2 to 4 ft.
.TUESDAY...Southeast winds 10 to 20 kt becoming south. Waves 3 to
5 ft.
.TUESDAY NIGHT...South winds 10 to 20 kt. Waves 3 to 5 ft.
.WEDNESDAY...South winds 15 to 25 kt. Waves 3 to 5 ft.
.THURSDAY...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ761-200930-
MAFOR 2004/
MICHIGAN NORTH 13820 12810 12820 11810. Waves 1 to 3 feet
overnight and Sunday. Waves 2 feet or less Sunday evening.

MICHIGAN SOUTH 11720 13820 11810 12820 11110. A chance of showers
Sunday morning. Waves 1 to 3 feet overnight. Waves 2 to 4 feet
subsiding to 1 to 3 feet Sunday. Waves 1 to 3 feet Sunday
evening.

$$


Sheppard

Experimental modernized open lake forecast is available online at
weather.gov/mkx/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes