677
FZUS63 KMKX 180208
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
908 PM CDT Mon Aug 17 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...

A slow-moving low pressure trough of around 29.9 inches will slide
across Lake Michigan during the day Tuesday. Winds will be
predominantly westerly. A few storms are possible within the
vicinity of the trough/front through Tuesday night. An isolated
stronger storm with gusty winds and hail cannot be ruled out. High
pressure of 30.0 inches will move through the western Great Lakes
Wednesday through Thursday, with light and variable winds
prevailing across the waters. The next thunderstorm chances arrive
Friday afternoon and evening, when the next cold front is
expected to move across Lake Michigan.

LMZ261-362-364-366-563-565-567-868-180930-
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-
908 PM CDT Mon Aug 17 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...South winds 10 to 15 kt becoming southwest
10 to 20 kt. Waves 1 to 3 ft.
.TUESDAY...Southwest winds 10 to 20 kt. Slight chance of showers
and thunderstorms in the morning, then chance of showers and
thunderstorms in the afternoon. Waves 2 to 4 ft.
.TUESDAY NIGHT...Northwest winds 10 to 20 kt becoming north 10 to
15 kt. Chance of showers and thunderstorms in the evening. Waves
2 to 4 ft.
.WEDNESDAY...Northwest winds 10 to 15 kt increasing to 10 to
20 kt. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...East winds 10 to 15 kt becoming northeast.
Waves 1 to 2 ft.
.THURSDAY...Northeast winds 5 to 10 kt veering to southeast 10 to
20 kt in the afternoon. Waves 1 ft or less building to 1 to 2 ft.
.THURSDAY NIGHT...South winds 10 to 20 kt increasing to 15 to
25 kt. Waves 1 to 3 ft.
.FRIDAY...Southwest winds to 30 kt. Chance of showers. Waves 2 to
4 ft.
.SATURDAY...Northwest winds 15 to 25 kt becoming north to 30 kt.
Chance of showers. Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-180930-
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-
908 PM CDT Mon Aug 17 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...Southwest winds 10 to 15 kt becoming west
10 to 20 kt. Waves 1 to 3 ft.
.TUESDAY...West winds 10 to 20 kt becoming southwest. Chance of
showers and slight chance of thunderstorms in the afternoon.
Waves 2 to 4 ft.
.TUESDAY NIGHT...Southwest winds 10 to 20 kt veering to northwest
10 to 15 kt. Chance of showers and thunderstorms in the evening.
Waves 2 to 4 ft.
.WEDNESDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 kt diminishing to
5 to 10 kt overnight. Waves 1 to 2 ft.
.THURSDAY...Northeast winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 2 ft.
.THURSDAY NIGHT...Southeast winds 10 to 20 kt becoming south.
Waves 1 to 3 ft.
.FRIDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft.
.SATURDAY...West winds 15 to 25 kt becoming northwest. Waves 2 to
4 ft.

$$

LMZ761-180930-
MAFOR 1804/
MICHIGAN NORTH 13520 11620 12520 11620 11820. A chance of showers
and thunderstorms Tuesday afternoon and Tuesday evening. Waves 1
to 3 feet.

MICHIGAN SOUTH 12520 11620 14520 11520. A chance of showers
Tuesday afternoon. A chance of showers and thunderstorms Tuesday
evening. Waves 1 to 3 feet.

$$


Cronce

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

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