663
FZUS63 KMKX 220203
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
903 PM CDT Wed May 21 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 29.6 inches will continue to exit through the
Ohio Valley into southern Ontario tonight, slowly filling and
weakening into Friday. Expect northeasterly winds across the
northern half and northwesterly winds across the southern half
into tonight, shifting to become all northwesterly and becoming
gusty around 30 kt into Thursday. Winds remain northwesterly
through Friday, with a ridge of high pressure around 30.2 inches
pushing into the western Great Lakes region Saturday and bringing
light and variable winds into Sunday. Sunday, low pressure around
29.5 inches will develop in the lee of the southern Rockies,
turning winds to northeasterly through early next week.

LMZ261-362-364-366-563-565-567-868-220915-
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-
903 PM CDT Wed May 21 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...North winds 10 to 20 kt increasing to 15 to
25 kt. Chance of rain showers late this evening. Waves 2 to 4 ft.
.THURSDAY...North winds 15 to 25 kt increasing to 30 kt. Waves
4 to 6 ft occasionally to 8 ft.
.THURSDAY NIGHT...North winds 15 to 25 kt becoming northwest
10 to 20 kt. Waves 3 to 5 ft.
.FRIDAY...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.
.FRIDAY NIGHT...North winds 10 to 20 kt becoming northwest. Waves
1 to 3 ft.
.SATURDAY...Northwest winds 10 to 15 kt increasing to 10 to
20 kt. Waves 1 to 2 ft.
.SATURDAY NIGHT...Northwest winds 10 to 15 kt becoming north 5 to
10 kt. Waves 1 to 2 ft.
.SUNDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.
.MONDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-220915-
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-
903 PM CDT Wed May 21 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...North winds 10 to 20 kt increasing to 15 to
25 kt. Rain showers late this evening, then chance of rain
showers overnight. Waves 3 to 5 ft.
.THURSDAY...North winds 15 to 25 kt increasing to 30 kt. Slight
chance of rain showers in the morning. Waves 3 to 5 ft building
to 5 to 8 ft occasionally to 10 ft.
.THURSDAY NIGHT...North winds 15 to 25 kt becoming northwest
10 to 20 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to
3 to 5 ft.
.FRIDAY...Northwest winds 10 to 20 kt becoming north. Waves 3 to
5 ft.
.FRIDAY NIGHT...North winds 10 to 20 kt diminishing to 5 to 10 kt
overnight. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.SATURDAY...North winds 10 to 15 kt. Waves 1 to 2 ft.
.SATURDAY NIGHT...Northeast winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 2 ft.
.SUNDAY...Northeast winds 10 to 15 kt becoming north 10 to 20 kt.
Waves 1 to 3 ft.
.MONDAY...Northeast winds 10 to 20 kt becoming north. Waves 1 to
3 ft.

$$

LMZ761-220915-
MAFOR 2204/
MICHIGAN NORTH 11820 13830 12840 12830. A chance of showers late
this evening. Waves 1 to 3 feet overnight. Waves 2 to 4 feet
building to 3 to 5 feet Thursday. Waves 2 to 4 feet Thursday
evening.

MICHIGAN SOUTH 11826 13830 12840 11830 11820. Waves 2 to 4 feet
overnight. Waves 2 to 4 feet building to 4 to 7 feet Thursday.
Waves 4 to 7 feet subsiding to 3 to 6 feet Thursday 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