923
FZUS63 KMKX 111351
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
851 AM CDT Tue Aug 11 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...

Light winds will dominate throughout the morning, with a line of
severe thunderstorms expected to cross the southern third around
midday today. Main hazards with these storms will be strong gusty
winds, but an isolated waterspout cannot be ruled out.

Light winds are expected to then continue throughout the week,
with periodic shower and thunderstorm chances for southern
portions of the Lake as weak areas of low pressure follow along
a stalled front over the lake. This front finally begins to sag
southward through Friday, allowing high pressure around 30.2
inches to build down across the Upper Great Lakes. As the high
pressure pushes east this weekend, expect low pressure to develop
over the Plains and track across the Great Lakes, bringing
increasing southerly winds.

LMZ261-362-364-366-563-565-567-868-112115-
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 Tue Aug 11 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...South winds 5 to 10 kt. Patchy fog through mid
morning. Waves nearly calm.
.TONIGHT...East winds 5 to 10 kt becoming north. Patchy fog
overnight. Slight chance of showers overnight. Waves nearly calm.
.WEDNESDAY...Northeast winds less than 10 kt becoming north late
in the morning, then becoming west 10 to 15 kt early in the
afternoon becoming northwest late. Patchy fog in the morning.
Waves nearly calm.
.WEDNESDAY NIGHT...North winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 ft or less.
.THURSDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.
.THURSDAY NIGHT...North winds 10 to 20 kt becoming northeast.
Waves 2 to 4 ft.
.FRIDAY...Northeast winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft.
.SATURDAY...Southeast winds 15 to 25 kt. Chance of showers. Waves
4 to 7 ft occasionally to 9 ft.

$$

LMZ080-669-671-870-872-874-876-878-112115-
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 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 Tue Aug 11 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH TO NORTH POINT LIGHT WI TO
GRAND HAVEN MI...

.REST OF TODAY...Southeast winds 5 to 10 kt becoming south.
Patchy fog through mid morning. Slight chance of showers and
thunderstorms through mid morning, then chance of showers and
slight chance of thunderstorms this afternoon. Waves 1 ft or
less.
.TONIGHT...Southeast winds 5 to 10 kt backing to north. Slight
chance of showers in the evening. Patchy fog overnight. Waves
1 ft or less.
.WEDNESDAY...North winds 5 to 10 kt becoming northwest. Patchy
fog in the morning. Waves nearly calm.
.WEDNESDAY NIGHT...North winds 5 to 10 kt. Waves 1 ft or less.
.THURSDAY...Northeast winds 10 to 15 kt becoming north 10 to
20 kt. Waves 1 to 2 ft.
.THURSDAY NIGHT...North winds 10 to 20 kt becoming northeast.
Waves 1 to 3 ft building to 3 to 5 ft.
.FRIDAY...Northeast winds 10 to 20 kt becoming north 15 to 25 kt.
Waves 3 to 5 ft.
.SATURDAY...Southeast winds 15 to 25 kt. Chance of showers. Waves
4 to 7 ft occasionally to 9 ft.

$$

LMZ673-675-777-779-112115-
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-
851 AM CDT Tue Aug 11 2026

NORTH POINT LIGHT WI TO GRAND HAVEN MI SOUTH...

...SEVERE THUNDERSTORM WATCH 563 IN EFFECT UNTIL 2 PM CDT THIS
AFTERNOON...

.REST OF TODAY...Southeast winds 5 to 10 kt becoming south 10 to
15 kt, then becoming southeast 5 to 10 kt late. Chance of showers
and thunderstorms through mid morning, then showers and
thunderstorms likely this afternoon. Waves 1 ft or less.
.TONIGHT...Southeast winds 5 to 10 kt backing to north. Slight
chance of showers in the evening. Patchy fog overnight. Waves
1 ft or less.
.WEDNESDAY...North winds 5 to 10 kt becoming east. Patchy fog in
the morning. Waves nearly calm.
.WEDNESDAY NIGHT...Northeast winds 5 to 10 kt. Waves 1 ft or
less.
.THURSDAY...Northeast winds 5 to 10 kt. Chance of showers in the
morning. Waves 1 to 2 ft.
.THURSDAY NIGHT...North winds 10 to 15 kt becoming northeast
10 to 20 kt. Waves 1 to 3 ft building to 3 to 5 ft.
.FRIDAY...Northeast winds 10 to 20 kt. Waves 3 to 5 ft.
.SATURDAY...Southeast winds 15 to 25 kt. Showers likely with a
chance of thunderstorms. Waves 4 to 6 ft occasionally to 8 ft.

$$

LMZ761-112115-
MAFOR 1116/
MICHIGAN NORTH 11400 11500 11200 12100 11800 11100 11800. Waves 1
foot or less.

MICHIGAN SOUTH...SEVERE THUNDERSTORM WATCH IN EFFECT...11319
11410 11300 12700 12800 11500. Waves 1 foot or less.

$$


MH

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

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