573
FZUS63 KMKX 260246
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
946 PM 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...

No major changes to the going forecast

A weak low pressure trough around 29.8 inches will stall along the
Wisconsin-Upper Michigan border this evening. It will remain over
Wisconsin and Lake Michigan through most of Monday which 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
through Monday as well.

Northerly winds will develop Monday night through Wednesday as
high pressure around 29.9 inches builds over the Upper Great Lakes
and the front pushes southward. A few gale force gusts are
possible Tuesday afternoon. Look for southerly winds and more
unsettled weather to resume Thursday into next weekend.

LMZ261-362-364-366-563-565-567-868-260930-
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-
946 PM CDT Sat Jul 25 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...Southwest winds 10 to 20 kt diminishing to
10 to 15 kt. Slight chance of showers and thunderstorms late this
evening. Patchy fog overnight. Waves 3 to 5 ft subsiding to 1 to
3 ft.
.SUNDAY...West winds 5 to 10 kt becoming southwest late in the
morning, then increasing to 10 to 15 kt early in the afternoon
becoming south 10 to 20 kt late. Patchy fog in the morning. Waves
1 to 3 ft.
.SUNDAY NIGHT...South winds 10 to 20 kt becoming southwest 10 to
15 kt. Chance of showers in the evening, then chance of showers
and thunderstorms overnight. Waves 1 to 3 ft.
.MONDAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Chance of showers in the morning, then showers likely in the
afternoon. Waves 1 to 3 ft.
.MONDAY NIGHT...North winds 10 to 20 kt increasing to 15 to
25 kt. Chance of showers. Waves 1 to 3 ft building to 4 to 6 ft
occasionally to 8 ft.
.TUESDAY...North winds 15 to 25 kt increasing to gales to 35 kt
in the afternoon. Waves 4 to 7 ft occasionally to 9 ft building
to 5 to 8 ft occasionally to 10 ft.
.TUESDAY NIGHT...North winds to 30 kt diminishing to 10 to 20 kt.
Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft.
.WEDNESDAY...North winds 10 to 20 kt increasing to 30 kt. Waves
2 to 4 ft.
.THURSDAY...East winds 10 to 15 kt veering to southwest 10 to
20 kt. Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-260930-
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-
946 PM CDT Sat Jul 25 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...South winds 10 to 20 kt becoming southwest
10 to 15 kt. Waves 2 to 4 ft.
.SUNDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt.
Waves 1 to 3 ft.
.SUNDAY NIGHT...South winds 10 to 15 kt. Chance of showers. Waves
1 to 3 ft.
.MONDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt.
Chance of showers in the morning, then showers likely with a
chance of thunderstorms in the afternoon. Waves 1 to 3 ft.
.MONDAY NIGHT...West winds 10 to 20 kt becoming north 15 to
25 kt. Showers likely with a chance of thunderstorms in the
evening, then chance of showers overnight. Waves 2 to 4 ft
building to 4 to 7 ft occasionally to 9 ft.
.TUESDAY...North winds 15 to 25 kt increasing to gales to 35 kt
in the afternoon. Waves 5 to 8 ft occasionally to 10 ft building
to 8 to 12 ft occasionally to 16 ft.
.TUESDAY NIGHT...North gales to 35 kt diminishing to 10 to 20 kt.
Waves 8 to 12 ft occasionally to 16 ft subsiding to 5 to 8 ft
occasionally to 10 ft.
.WEDNESDAY...North winds 10 to 20 kt increasing to 30 kt. Waves
3 to 5 ft.
.THURSDAY...Northeast winds 10 to 15 kt becoming north 10 to
20 kt. Waves 1 to 3 ft subsiding to 1 to 2 ft.

$$

LMZ761-260930-
MAFOR 2604/
MICHIGAN NORTH 11520 11510 11610 12500 13410. A chance of showers
Sunday evening. Waves 2 to 4 feet subsiding to 1 to 3 feet
overnight. Waves 2 feet or less Sunday and Sunday evening.

MICHIGAN SOUTH 13510 11500 11400 13410. A chance of showers
Sunday evening. Waves 1 to 3 feet overnight. Waves 2 feet or less
Sunday and Sunday evening.

$$


CMiller

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

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