463
FZUS63 KMKX 190144
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
844 PM CDT Fri Jul 18 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 30.1 inches over Lake Erie will continue to
move east tonight, as low pressure around 29.8 inches develops in
the lee of the Colorado Rockies. A warm front will develop across
northern Wisconsin and the Upper Peninsula of Michigan overnight,
bringing showers and thunderstorms to the northern half of the
lake. Additional thunderstorm development is possible across the
southern half of the lake into Saturday morning. Light south to
southeast winds will become south by Saturday morning.

Winds become southwesterly as the showers and storms end by
midday Saturday, then become northerly behind a cold front
Saturday afternoon and evening. A few thunderstorms are possible
along this front. High pressure around 30.0 inches will settle
back into the region on Sunday, slowly departing into Monday and
shifting winds to easterly. A low pressure trough around 29.8
inches will cross the Upper Midwest on Tuesday, bringing
southeasterly winds.

LMZ261-362-364-366-563-565-567-868-190915-
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-
844 PM CDT Fri Jul 18 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...Southwest winds 5 to 10 kt becoming south.
Waves 1 ft or less.
.SATURDAY...South winds 10 to 15 kt increasing to 10 to 20 kt,
then veering to northwest 10 to 15 kt late. Chance of showers and
slight chance of thunderstorms in the morning, then chance of
showers and thunderstorms in the afternoon. Waves 1 to 2 ft.
.SATURDAY NIGHT...North winds 10 to 15 kt. Waves 1 to 3 ft.
.SUNDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.SUNDAY NIGHT...Northeast winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 1 to 2 ft.
.MONDAY...East winds 10 to 15 kt. Waves 1 to 3 ft.
.MONDAY NIGHT...East winds 10 to 15 kt becoming southeast 10 to
20 kt. Waves 1 to 3 ft.
.TUESDAY...South winds 10 to 20 kt. Waves 2 to 4 ft.
.WEDNESDAY...Southwest winds 10 to 20 kt. Chance of showers and
thunderstorms. Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-190915-
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-
844 PM CDT Fri Jul 18 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...East winds 5 to 10 kt becoming south. Waves
1 to 2 ft.
.SATURDAY...South winds 10 to 15 kt becoming southwest 10 to
20 kt. Chance of showers and slight chance of thunderstorms in
the morning, then chance of showers and thunderstorms in the
afternoon. Waves 1 to 3 ft.
.SATURDAY NIGHT...Northwest winds 10 to 15 kt becoming north.
Chance of showers and thunderstorms in the evening. Waves 2 to
4 ft.
.SUNDAY...Northeast winds 10 to 20 kt becoming north. Waves 2 to
4 ft.
.SUNDAY NIGHT...Northeast winds 10 to 20 kt becoming east 10 to
15 kt. Waves 1 to 3 ft.
.MONDAY...East winds 10 to 20 kt diminishing to 10 to 15 kt.
Waves 2 to 4 ft.
.MONDAY NIGHT...East winds 10 to 15 kt becoming southeast 10 to
20 kt. Waves 1 to 3 ft.
.TUESDAY...Southeast winds 10 to 20 kt becoming south. Waves 2 to
4 ft.
.WEDNESDAY...South winds 10 to 20 kt becoming southwest. Waves
2 to 4 ft.

$$

LMZ761-190915-
MAFOR 1904/
MICHIGAN NORTH 12400 11410 11416 11410 11710 12810. A chance of
thunderstorms Saturday. Waves 2 feet or less.

MICHIGAN SOUTH 11300 11400 12410 11526 11520 11610 11810. A
chance of thunderstorms Saturday afternoon and Saturday evening.
Waves 2 feet 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