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National Weather Service Marine Forecast FZUS63 KMKX

FZUS63 KMKX 112019
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
319 PM CDT Sat Apr 11 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

Southeast winds return this afternoon and become gusty tonight as a sharper pressure gradient moves over Lake Michigan as low pressure moves into the northern Great Plains.

Low pressure will shift into the northern Great Plains during the day Sunday as it deepens to near 29.4 inches. The low will quickly shift east toward Lake Superior Sunday night, reaching the southern shores of the Hudson Bay by daybreak Monday morning. Winds will thus increase further across the open waters Sunday through Sunday night. Will be monitoring for gale potential during this time frame, particularly over the northern half of Lake Michigan. As of this forecast update, forecast models continue to suggest possible gales and headlines may be needed in the coming days.

Winds will weaken Monday morning as high pressure of 30.0 inches moves across Ontario. Then, passing low pressure systems will lead to persistently active conditions across Lake Michigan into next week. Will need to monitor thunderstorm development during the Monday- Wednesday time period, as some storms could become strong to severe.

LMZ261-362-364-366-563-565-567-868-120330
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
319 PM CDT Sat Apr 11 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

TONIGHT
South winds 10 to 20 kt becoming southeast to 30 kt. Chance of rain showers this evening, then rain showers and slight chance of thunderstorms overnight. Waves 1 to 3 ft building to 4 to 7 ft occasionally to 9 ft.

SUNDAY
Southeast winds to 30 kt becoming south. Rain showers with a chance of thunderstorms in the morning, then chance of rain showers and slight chance of thunderstorms in the afternoon. Waves 6 to 9 ft occasionally to 12 ft.

SUNDAY NIGHT
South winds to 30 kt becoming southwest. A few gusts to gale force possible. Chance of rain showers in the evening, then rain showers likely overnight. Waves 7 to 10 ft occasionally to 13 ft.

MONDAY
Southwest winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft.

MONDAY NIGHT
East winds 10 to 20 kt becoming southeast 15 to 25 kt. Rain showers likely with a chance of thunderstorms in the evening, then rain showers with a chance of thunderstorms overnight. Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.

TUESDAY
South winds 15 to 25 kt diminishing to 10 to 20 kt. Chance of rain showers and thunderstorms in the morning, then chance of rain showers in the afternoon. Waves 4 to 6 ft occasionally to 8 ft.

TUESDAY NIGHT
East winds 10 to 20 kt increasing to 15 to 25 kt. Rain showers likely. Waves 3 to 5 ft building to 4 to 7 ft occasionally to 9 ft.

WEDNESDAY
South winds 15 to 25 kt. Chance of rain showers. Waves 5 to 8 ft occasionally to 10 ft.

THURSDAY
Northeast winds 10 to 20 kt veering to southeast 10 to 15 kt. Waves 2 to 4 ft.

LMZ080-669-671-673-675-777-779-870-872-874-876-878-120330
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
319 PM CDT Sat Apr 11 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

TONIGHT
East winds 10 to 15 kt becoming southeast 10 to 20 kt late this evening, then increasing to 15 to 25 kt after midnight increasing to 30 kt late. Chance of rain showers this evening, then rain showers likely with slight chance of thunderstorms overnight. Waves 1 to 3 ft building to 4 to 7 ft occasionally to 9 ft.

SUNDAY
South winds to 30 kt becoming southwest. Chance of rain showers and slight chance of thunderstorms. Waves 5 to 8 ft occasionally to 10 ft.

SUNDAY NIGHT
Southwest winds to 30 kt diminishing to 15 to 25 kt. Rain showers likely in the evening, then rain showers overnight. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 7 ft occasionally to 9 ft.

MONDAY
Southwest winds 15 to 25 kt becoming south 10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft.

MONDAY NIGHT
South winds 10 to 20 kt increasing to 15 to 25 kt. Chance of rain showers and thunderstorms. Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.

TUESDAY
South winds 15 to 25 kt diminishing to 10 to 20 kt. Rain showers likely with a chance of thunderstorms in the afternoon. Waves 4 to 6 ft occasionally to 8 ft.

TUESDAY NIGHT
South winds 10 to 20 kt becoming southwest 15 to 25 kt. Rain showers with a chance of thunderstorms. Waves 3 to 5 ft building to 4 to 7 ft occasionally to 9 ft.

WEDNESDAY
Southwest winds 15 to 25 kt becoming south. Chance of rain showers. Waves 5 to 8 ft occasionally to 10 ft.

THURSDAY
Southwest winds 10 to 20 kt diminishing to 10 to 15 kt. Chance of rain showers. Waves 3 to 5 ft.

LMZ761-120330
MAFOR 1122/ MICHIGAN NORTH 11420 11310 11330 12346 12446 11440. A chance of thunderstorms Sunday morning. Waves 1 to 3 feet building to 3 to 6 feet tonight. Waves 5 to 8 feet Sunday.

MICHIGAN SOUTH 11210 11320 11336 11346 14440. A chance of thunderstorms overnight into Sunday. Waves 2 feet or less building to 3 to 6 feet tonight. Waves 5 to 8 feet Sunday.

Sheppard

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

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