093
FZUS63 KMKX 170801
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
301 AM 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...

High pressure around 30.1 inches will build east from the Plains
today, bringing light and variable winds to Lake Michigan through
tonight. The high pressure will pass to the south of Lake
Michigan on Tuesday and bringing increasing southwesterly winds
through the day as a low pressure around 29.5 inches develops and
meanders over the Hudson Bay region. This low pressure will then
drag a slow moving cold front across the Upper Great Lakes later
Tuesday into early Wednesday and bring thunderstorm chances back
to the region. The front is progged to push east of the region by
Wednesday with another high pressure building back into the
region for the second half of the week along with light and
variable winds. Increasing southwesterly winds are expected to
return for the end of the week along with additional thunderstorm
chances.

LMZ261-362-364-366-563-565-567-868-171530-
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-
301 AM CDT Mon Aug 17 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Northwest winds 5 to 10 kt becoming west late this
morning, then becoming southwest 10 to 20 kt this afternoon.
Waves 1 to 2 ft.
.TONIGHT...South winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 1 to 3 ft.
.TUESDAY...West winds 10 to 20 kt increasing to 15 to 25 kt.
Chance of showers 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, then
chance of showers overnight. Waves 2 to 4 ft subsiding to 1 to
3 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. Waves 1 ft or less.
.FRIDAY...Southwest winds 15 to 25 kt increasing to 30 kt. Waves
2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-171530-
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-
301 AM CDT Mon Aug 17 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...North winds 10 to 15 kt increasing to 10 to 20 kt. Waves
1 to 3 ft.
.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 15 to 25 kt.
Chance of showers in the afternoon. Waves 2 to 4 ft.
.TUESDAY NIGHT...West winds 10 to 20 kt becoming northwest.
Chance of showers and thunderstorms in the evening, then chance
of showers overnight. 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. Waves 1 to 2 ft.
.THURSDAY...Northeast winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 2 ft.
.FRIDAY...South winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 1 to 2 ft building to 2 to 4 ft.

$$

LMZ761-171530-
MAFOR 1710/
MICHIGAN NORTH 11710 11700 11610 11520 11410 12510 11520. Waves 2
feet or less.

MICHIGAN SOUTH 11820 11810 12820 11610 13510. Waves 1 to 3 feet
today. Waves 2 feet or less tonight.

$$


Wagner

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

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