427
FZUS63 KMKX 250731
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
231 AM CDT Sat Jul 25 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...

Gusty south to southwest winds are expected across all of Lake
Michigan through today, as low pressure around 29.5 inches
approaches from the northern Plains. Gusts up to 30 knots are
expected over the north half of the lake.

A frontal boundary will then stall mainly over Wisconsin and Lake
Michigan tonight through most of Monday. This will result in
increasing thunderstorm chances, with severe storms possible. Very
warm, moist and unstable air flowing over the relatively cool
waters may cause patchy dense fog over the lake early next week.

Northerly winds are expected Monday night through Wednesday, as
high pressure around 29.9 inches builds over the Upper Great
Lakes. Look for southerly winds and more unsettled weather to
resume Thursday into next weekend.

LMZ261-362-364-366-563-565-567-868-251530-
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-
231 AM CDT Sat Jul 25 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Southwest winds 15 to 25 kt becoming south to 30 kt.
Waves 3 to 5 ft.
.TONIGHT...South winds 15 to 25 kt becoming southwest 10 to 20 kt
late in the evening, then diminishing to 10 to 15 kt after
midnight becoming southwest 10 to 15 kt late. Slight chance of
showers and thunderstorms in the evening, then slight chance of
showers overnight. Waves 3 to 5 ft subsiding to 2 to 4 ft.
.SUNDAY...Southwest winds 5 to 10 kt becoming south 10 to 20 kt.
Chance of showers and thunderstorms in the afternoon. Waves 1 to
3 ft.
.SUNDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Showers likely. Waves 1 to 3 ft.
.MONDAY...Southwest winds 10 to 20 kt becoming south. Chance of
showers. Waves 1 to 3 ft.
.MONDAY NIGHT...North winds 10 to 20 kt increasing to 15 to
25 kt. Waves 1 to 3 ft.
.TUESDAY...North winds 15 to 25 kt increasing to 30 kt. Waves
2 to 4 ft.
.WEDNESDAY...North winds 10 to 15 kt increasing to 15 to 25 kt.
Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-251530-
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-
231 AM CDT Sat Jul 25 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Southwest winds 10 to 20 kt becoming south 15 to 25 kt.
Waves 3 to 5 ft.
.TONIGHT...South winds 10 to 20 kt becoming southwest 10 to
15 kt. Slight chance of showers overnight. Waves 3 to 5 ft
subsiding to 2 to 4 ft.
.SUNDAY...West winds 10 to 15 kt becoming south 10 to 20 kt.
Waves 1 to 3 ft.
.SUNDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Chance of showers and thunderstorms in the evening, then chance
of showers overnight. Waves 1 to 3 ft.
.MONDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt.
Showers likely in the morning, then chance of showers and
thunderstorms in the afternoon. Waves 2 to 4 ft.
.MONDAY NIGHT...West winds 10 to 20 kt becoming north 15 to
25 kt. Waves 3 to 5 ft.
.TUESDAY...North winds 15 to 25 kt increasing to 30 kt. Waves
4 to 6 ft occasionally to 8 ft.
.WEDNESDAY...North winds 10 to 15 kt increasing to 15 to 25 kt.
Waves 1 to 3 ft.

$$

LMZ761-251530-
MAFOR 2510/
MICHIGAN NORTH 12530 11540 11440 11430 11520 12510. Waves 2 to 4
feet building to 3 to 5 feet today. Waves 2 to 4 feet subsiding
to 1 to 3 feet tonight.

MICHIGAN SOUTH 11510 11520 13430 11420 12510. Waves 1 to 3 feet
building to 2 to 4 feet today. Waves 2 to 4 feet subsiding to 1
to 3 feet tonight.

$$


Quigley

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

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