849
FZUS63 KMKX 301948
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
248 PM CDT Wed Jul 30 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...

North to northeast winds will persist across Lake Michigan
through Friday. Weak low pressure around 29.9 inches is moving
east through the Ohio River Valley today bringing showers and
thunderstorms to the southern half of the Lake. A few stronger
gusts with the thunderstorms will be possible across the far
southern end of the Lake, but not anticipating any severe level
wind gusts.

High pressure around 30.3 inches will move into the western Great
Lakes from the Northern Plains Thursday. This area of high
pressure will slowly move eastward overtimes and be overhead
Saturday. Winds will light and variable across the lake much of
the day Saturday before becoming light south to southeasterly
Sunday afternoon as the high pushes into the New England States.

LMZ261-362-364-366-563-565-567-868-310315-
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-
248 PM CDT Wed Jul 30 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...North winds 15 to 25 kt becoming northeast. Areas of
smoke. Waves 3 to 5 ft building to 4 to 7 ft occasionally to
9 ft.
.THURSDAY...Northeast winds 15 to 25 kt increasing to 30 kt.
Areas of smoke. Waves 4 to 6 ft occasionally to 8 ft.
.THURSDAY NIGHT...North winds to 30 kt becoming northeast 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.
.FRIDAY...North winds 10 to 20 kt. Waves 1 to 3 ft.
.FRIDAY NIGHT...Northwest winds 10 to 20 kt becoming west 5 to
10 kt overnight. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.SATURDAY...West winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 1 to 2 ft.
.SATURDAY NIGHT...Southwest winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 2 ft.
.SUNDAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.
.MONDAY...South winds 5 to 10 kt becoming southeast 10 to 15 kt.
Waves 1 ft or less.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-310315-
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-
248 PM CDT Wed Jul 30 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Northeast winds 15 to 25 kt increasing to 30 kt.
Showers likely with slight chance of thunderstorms this evening,
then chance of showers and slight chance of thunderstorms
overnight. Waves 5 to 8 ft occasionally to 10 ft.
.THURSDAY...Northeast winds to 30 kt becoming north. Slight
chance of showers in the morning. Patchy smoke. Waves 5 to 8 ft
occasionally to 10 ft subsiding to 4 to 7 ft occasionally to
9 ft.
.THURSDAY NIGHT...North winds to 30 kt becoming northeast 15 to
25 kt late in the evening, then diminishing to 10 to 20 kt after
midnight becoming northeast 10 to 20 kt late. Patchy smoke in the
evening. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to
7 ft occasionally to 9 ft.
.FRIDAY...Northeast winds 10 to 20 kt becoming north. Waves 3 to
5 ft subsiding to 2 to 4 ft.
.FRIDAY NIGHT...North winds 10 to 20 kt becoming northeast 10 to
15 kt. Waves 2 to 4 ft.
.SATURDAY...Northeast winds 5 to 10 kt becoming north 10 to
15 kt. Waves 1 to 3 ft.
.SATURDAY NIGHT...North winds 5 to 10 kt veering to south. Waves
1 ft or less.
.SUNDAY...Southeast winds 5 to 10 kt becoming south. Waves 1 ft
or less.
.MONDAY...Southeast winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 2 ft.

$$

LMZ761-310315-
MAFOR 3022/
MICHIGAN NORTH 11830 15130 11140. Waves 2 to 4 feet building to 3
to 6 feet tonight. Waves 3 to 6 feet Thursday.

MICHIGAN SOUTH 13136 14130 11840. Waves 3 to 6 feet building to 4
to 7 feet tonight. Waves 4 to 7 feet subsiding to 3 to 6 feet
Thursday.

$$


Patterson

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

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