953
FZUS63 KMKX 011351
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
851 AM CDT Mon Sep 1 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...

High pressure around 30.3 inches will linger over the region into
Tuesday morning, with light winds. South to southwest winds will
become established late Tuesday afternoon through Tuesday night,
as low pressure around 29.6 inches develops across Lake Superior.

The low will slowly move east toward the Ontario and Quebec
border Wednesday, dragging a strong cold front across Lake
Michigan. Gusty northwest winds will become established along and
behind the passing front Wednesday evening through Thursday
morning. Widespread gale force gusts are not anticipated at this
time, though forecast trends will be closely monitored.

Winds are forecast to turn west southwest Thursday afternoon and
night, as another low pressure system around 29.4 inches develops
somewhere across the western Great Lakes region. Additional gusty
winds will be possible during this time. The low will cross over
or just to the north of Lake Michigan during the day on Friday,
resulting in a northwest wind shift Friday night into Saturday.

Showers are expected, with some thunderstorms, along the
advancing cold front Wednesday and Wednesday evening. A few storms
could produce gusty winds. Forecast trends will also be monitored
for waterspout potential during the day on Wednesday,
particularly across the northern half of the open waters.

Additional showers and isolated thunderstorms will be possible
ahead of the second low on Friday. Whether or not gusty winds or
waterspouts will accompany this activity remains uncertain at this
time.

LMZ261-362-364-366-563-565-567-868-012130-
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-
851 AM CDT Mon Sep 1 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...South winds less than 10 kt veering to west.
Waves nearly calm.
.TONIGHT...Northeast winds 5 to 10 kt backing to southwest. Waves
nearly calm.
.TUESDAY...Southwest winds 5 to 10 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.
.TUESDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Waves 2 to 4 ft.
.WEDNESDAY...Southwest winds 15 to 25 kt becoming west. Showers
likely in the morning, then showers with a chance of
thunderstorms in the afternoon. Waves 3 to 5 ft building to 4 to
6 ft occasionally to 8 ft.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 kt. Chance of
showers. Waves 4 to 6 ft occasionally to 8 ft.
.THURSDAY...Northwest winds 15 to 25 kt becoming west. Waves 3 to
5 ft.
.FRIDAY...Southwest winds 15 to 25 kt becoming west. Chance of
showers. Waves 4 to 6 ft occasionally to 8 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-012130-
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-
851 AM CDT Mon Sep 1 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...Southeast winds 5 to 10 kt backing to north.
Waves 1 ft or less.
.TONIGHT...North winds 5 to 10 kt veering to east. Waves 1 to
2 ft.
.TUESDAY...Southeast winds 5 to 10 kt veering to west. Waves 1 ft
or less.
.TUESDAY NIGHT...South winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 1 to 3 ft.
.WEDNESDAY...Southwest winds 10 to 20 kt increasing to 15 to
25 kt. Chance of showers. Waves 3 to 5 ft building to 4 to 6 ft
occasionally to 8 ft.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 kt. Showers likely
with a chance of thunderstorms. Waves 4 to 6 ft occasionally to
8 ft building to 4 to 7 ft occasionally to 9 ft.
.THURSDAY...Northwest winds 15 to 25 kt becoming west. Waves 4 to
7 ft occasionally to 9 ft.
.FRIDAY...Southwest winds 15 to 25 kt becoming west. Chance of
showers. Waves 4 to 7 ft occasionally to 9 ft.

$$

LMZ761-012130-
MAFOR 0116/
MICHIGAN NORTH 11400 11500 11700 11200 11300 11400 12500. Waves 1
foot or less.

MICHIGAN SOUTH 11300 12800 12100 12200 11500. Waves 1 foot or
less.

$$
Wood

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

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