026
FZUS63 KMKX 171946
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
246 PM CDT Thu Sep 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...

Light and variable winds over the north half of the lake this
afternoon and light northeast winds over the south half, will
become a steady and modest east northeast wind over the entire
lake tonight and Friday. This will occur as an area of 30.4 inch
high pressure will shift from Manitoba into Ontario.

29.9 inch low pressure will develop near the middle Missouri
River Friday afternoon then gradually shifting to the northern
Ohio Valley for Saturday afternoon and night, and persist into
early next week. Breezy east southeast winds will develop over
the south half of the lake Friday night and Saturday becoming
northeast late Saturday night into early next week. Widespread
showers and storms will accompany the approaching and passing low
Friday night through at least Saturday night, with widespread
severe weather not expected.

LMZ261-362-364-366-563-565-567-868-180315-
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-
246 PM CDT Thu Sep 17 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...North winds 10 to 15 kt becoming northeast 10 to
20 kt. Waves 1 to 3 ft.
.FRIDAY...Northeast winds 10 to 20 kt. Chance of showers in the
afternoon. Waves 2 to 4 ft.
.FRIDAY NIGHT...East winds 10 to 20 kt becoming southeast 15 to
25 kt. Showers likely in the evening, then showers overnight.
Waves 3 to 5 ft building to 4 to 7 ft occasionally to 9 ft.
.SATURDAY...Southeast winds 15 to 25 kt becoming east. Chance of
showers. Waves 6 to 9 ft occasionally to 12 ft.
.SATURDAY NIGHT...East winds 10 to 20 kt becoming northeast.
Chance of showers. Waves 4 to 6 ft occasionally to 8 ft subsiding
to 2 to 4 ft.
.SUNDAY...Northeast winds 15 to 25 kt increasing to 30 kt. Waves
4 to 6 ft occasionally to 8 ft building to 5 to 8 ft occasionally
to 10 ft.
.SUNDAY NIGHT...Northeast winds to 30 kt becoming east 15 to
25 kt. Waves 6 to 9 ft occasionally to 12 ft.
.MONDAY...East winds 10 to 20 kt becoming northeast 15 to 25 kt.
Waves 4 to 6 ft occasionally to 8 ft.
.TUESDAY...East winds 10 to 20 kt becoming northeast 15 to 25 kt.
Waves 4 to 6 ft occasionally to 8 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-180315-
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-
246 PM CDT Thu Sep 17 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...North winds 10 to 20 kt becoming northeast. Slight
chance of drizzle this evening. Waves 2 to 4 ft.
.FRIDAY...East winds 10 to 20 kt becoming northeast. Waves 3 to
5 ft.
.FRIDAY NIGHT...East winds 10 to 20 kt increasing to 30 kt.
Chance of showers in the evening, then showers overnight. Waves
2 to 4 ft building to 6 to 9 ft occasionally to 12 ft.
.SATURDAY...Southeast winds to 30 kt. Showers. Waves 8 to 11 ft
occasionally to 14 ft.
.SATURDAY NIGHT...East winds 10 to 20 kt becoming northeast.
Showers. Waves 4 to 7 ft occasionally to 9 ft subsiding to 4 to
6 ft occasionally to 8 ft.
.SUNDAY...Northeast winds 15 to 25 kt increasing to 30 kt. Chance
of showers. Waves 6 to 9 ft occasionally to 12 ft building to
8 to 11 ft occasionally to 14 ft.
.SUNDAY NIGHT...Northeast winds to 30 kt becoming east. Chance of
showers. Waves 8 to 12 ft occasionally to 16 ft subsiding to 7 to
10 ft occasionally to 13 ft.
.MONDAY...East winds to 30 kt becoming northeast. Chance of
showers. Waves 8 to 11 ft occasionally to 14 ft building to 8 to
12 ft occasionally to 16 ft.
.TUESDAY...East winds 15 to 25 kt becoming northeast. Waves 6 to
9 ft occasionally to 12 ft.

$$

LMZ761-180315-
MAFOR 1722/
MICHIGAN NORTH 12810 12110 11120 13110. A chance of showers
Friday afternoon. Waves 1 to 3 feet.

MICHIGAN SOUTH 11810 11110 13120 12220 11110. Patchy drizzle
early this evening. Waves 1 to 3 feet building to 2 to 4 feet
tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet Friday.

$$


Gehring

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

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