461
FZUS63 KMKX 041953
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
253 PM CDT Fri Jul 4 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 of 30.1 inches over the eastern Great Lakes will
continue to gradually move east tonight, with broad troughing of
29.7 inches persisting over the central and northern Great
Plains. South to southwest winds today will increase Saturday
ahead of a cold front, which will pass through the lake late
Saturday night. Northwest winds behind the front by late Saturday
night will become more northerly Sunday and Sunday night. Winds
will remain from the north on Monday as weak high pressure noses
into the region, before southerly flow returns on Tuesday.

Thunderstorms will be possible again Saturday night and early
Sunday with the front.

LMZ261-362-364-366-563-565-567-868-050315-
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-
253 PM CDT Fri Jul 4 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...South winds 10 to 20 kt becoming southwest. Waves 1 to
3 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south to 30 kt.
Slight chance of showers and thunderstorms in the afternoon.
Waves 3 to 5 ft.
.SATURDAY NIGHT...Southwest winds to 30 kt diminishing to 10 to
20 kt after midnight, then becoming west late. Showers likely
with a chance of thunderstorms in the evening, then showers
likely overnight. Waves 4 to 6 ft occasionally to 8 ft.
.SUNDAY...Northwest winds 15 to 25 kt becoming north. Chance of
showers. Waves 3 to 5 ft.
.SUNDAY NIGHT...North winds 10 to 20 kt. Waves 2 to 4 ft.
.MONDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.MONDAY NIGHT...Northeast winds 10 to 15 kt becoming southeast
5 to 10 kt. Waves 1 to 2 ft.
.TUESDAY...South winds 5 to 10 kt becoming southwest 10 to 15 kt.
Waves 1 ft or less.
.WEDNESDAY...Northeast winds 10 to 15 kt. Waves 1 ft or less.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-050315-
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-
253 PM CDT Fri Jul 4 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...South winds 10 to 20 kt becoming southwest. Waves 1 to
3 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south 15 to
25 kt. Waves 3 to 5 ft.
.SATURDAY NIGHT...South winds 15 to 25 kt becoming southwest
10 to 20 kt. Chance of showers and thunderstorms. Waves 3 to
5 ft.
.SUNDAY...West winds 10 to 20 kt becoming north 15 to 25 kt.
Chance of showers in the morning, then chance of showers and
thunderstorms in the afternoon. Waves 3 to 5 ft.
.SUNDAY NIGHT...North winds 10 to 20 kt. Waves 3 to 5 ft.
.MONDAY...Northeast winds 10 to 15 kt becoming north 10 to 20 kt.
Waves 2 to 4 ft.
.MONDAY NIGHT...Northeast winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 3 ft.
.TUESDAY...Southwest winds 5 to 10 kt becoming south 10 to 15 kt.
Waves 1 ft or less.
.WEDNESDAY...East winds 5 to 10 kt becoming northeast 10 to
15 kt. Waves 1 to 2 ft.

$$

LMZ761-050315-
MAFOR 0422/
MICHIGAN NORTH 13420 13520 11430 11440. Waves 1 to 3 feet
tonight. Waves 1 to 3 feet building to 2 to 4 feet Saturday.

MICHIGAN SOUTH 12420 11410 12520 12420 11430. Waves 1 to 3 feet
tonight. Waves 1 to 3 feet building to 2 to 4 feet Saturday.

$$

DDV

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

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