FZUS63 KMKX 210803

GLFLM 



OPEN LAKE FORECAST for Lake Michigan

National Weather Service Milwaukee/Sullivan WI

303 AM CDT Sun Jun 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...



Low pressure around 29.5 inches will track eastward from the 

central Plains into central Illinois early this evening, then into

Ohio by Monday. This will bring light easterly winds through the

daytime hours today, becoming breezy northeast winds over the 

southern portions of the lake later today into tonight. Lighter 

winds return late Monday evening into Tuesday as high pressure 

around 30.1 inches builds into the region.



LMZ261-362-364-366-563-565-567-868-211515-

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 Sun Jun 21 2026



SHEBOYGAN WI TO PENTWATER MI NORTH...



.TODAY...Southeast winds less than 10 kt becoming south late this

morning, then becoming 10 to 15 kt early this afternoon becoming

south 10 to 15 kt late. Patchy fog. Waves 1 ft or less. 

.TONIGHT...East winds 5 to 10 kt becoming northeast late in the

evening, then increasing to 10 to 15 kt after midnight becoming

north 10 to 20 kt late. Waves 1 to 2 ft building to 1 to 3 ft. 

.MONDAY...North winds 10 to 20 kt increasing to 30 kt. Waves 3 to

5 ft. 

.MONDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to

20 kt. Waves 3 to 5 ft subsiding to 1 to 3 ft. 

.TUESDAY...North winds 10 to 15 kt becoming northwest 10 to

20 kt. Waves 1 to 2 ft. 

.TUESDAY NIGHT...North winds 5 to 10 kt veering to east. Waves

1 ft or less. 

.WEDNESDAY...Southeast winds 10 to 15 kt. Chance of showers.

Waves 1 to 2 ft. 

.THURSDAY...North winds 10 to 15 kt becoming northwest 10 to

20 kt. Waves 1 to 2 ft.  



$$



LMZ080-669-671-673-675-777-779-870-872-874-876-878-211515-

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 Sun Jun 21 2026



SHEBOYGAN WI TO PENTWATER MI SOUTH...



.TODAY...East winds less than 10 kt becoming southeast 10 to

20 kt. Chance of showers this afternoon. Waves nearly calm

building to 1 to 2 ft. 

.TONIGHT...East winds 15 to 25 kt becoming northeast to 30kt.

Showers likely in the evening, then chance of showers overnight.

Waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft. 

.MONDAY...Northeast winds to 30 kt becoming north. Waves 4 to

7 ft occasionally to 9 ft. 

.MONDAY NIGHT...North 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. 

.TUESDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.

Waves 2 to 4 ft. 

.TUESDAY NIGHT...North winds 10 to 15 kt backing to southwest.

Waves 1 to 2 ft. 

.WEDNESDAY...South winds 10 to 15 kt. Chance of showers. Waves

1 to 2 ft. 

.THURSDAY...West winds 10 to 15 kt becoming northwest 10 to

20 kt. Waves 1 to 2 ft.  



$$



LMZ761-211515-

MAFOR 2110/

MICHIGAN NORTH 12300 12410 11300 11100 12110. Waves 2 feet or

less. 



MICHIGAN SOUTH 11200 12300 11320 11336 11246 12140. Waves 2 feet

or less today. Waves 2 to 4 feet building to 3 to 6 feet tonight.



$$





Sheppard



Experimental modernized open lake forecast is available online at

weather.gov/mkx/glftable



Graphical marine forecasts are available online at:

weather.gov/greatlakes