810
FZUS63 KMKX 182049
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
249 PM CST Tue Nov 18 2025

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...

29.8 inch low pressure is positioned over the middle Mississippi
Valley this afternoon, resulting in breezy east winds across the
southern half of Lake Michigan. Winds are lighter further north,
where higher surface pressure is in place. Winds will gradually
taper across all of the Lake Michigan late tonight through
Wednesday as 30.2 inch high pressure builds across the western
Great Lakes. 29.6 inch low pressure will develop along the
Ontario-Manitoba border Wednesday night, deepening to near 29.5
inches over the Hudson Bay by Thursday afternoon. The low`s
development and progression will result in a southwest wind shift
across Lake Michigan, with winds becoming gusty late Thursday
morning and afternoon. Highest gusts are expected over the
northern third of the waters, where 20-25 kt readings are
currently forecast. Gales aren`t expected, though trends will
continue to be monitored. A cold front will cross the waters
Thursday night, resulting in northwest winds Friday into Saturday
morning. Rain showers will continue into this afternoon over the
southern half of Lake Michigan. A few wet snowflakes could mix in
over the middle portion of the lake. Additional rain is possible
Thursday, particularly over the northern third of the waters.

LMZ261-362-364-366-563-565-567-868-190415-
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-
249 PM CST Tue Nov 18 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Northeast winds 5 to 10 kt becoming north. Waves 1 to
2 ft.
.WEDNESDAY...Northwest winds less than 10 kt backing to
southwest. Waves 1 ft or less.
.WEDNESDAY NIGHT...Southwest winds 10 to 15 kt increasing to
10 to 20 kt. Waves 1 to 3 ft.
.THURSDAY...Southwest winds 15 to 25 kt. Chance of rain in the
morning, then rain likely in the afternoon. Waves 3 to 5 ft.
.THURSDAY NIGHT...West winds 15 to 25 kt becoming northwest 10 to
20 kt. Waves 3 to 5 ft.
.FRIDAY...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.
.FRIDAY NIGHT...Northwest winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 2 ft.
.SATURDAY...Southwest winds 10 to 20 kt. Waves 1 to 2 ft building
to 1 to 3 ft.
.SUNDAY...West winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-190415-
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-
249 PM CST Tue Nov 18 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Northeast winds 10 to 20 kt diminishing to 10 to
15 kt. Chance of sprinkles this evening. Waves 3 to 5 ft
subsiding to 2 to 4 ft.
.WEDNESDAY...East winds 10 to 15 kt becoming southeast 5 to
10 kt. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.WEDNESDAY NIGHT...Southeast winds 5 to 10 kt becoming southwest.
Waves 1 to 2 ft.
.THURSDAY...Southwest winds 10 to 20 kt. Chance of rain in the
afternoon. Waves 1 to 3 ft building to 2 to 4 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt becoming northwest.
Chance of rain in the evening. Waves 3 to 5 ft.
.FRIDAY...Northwest winds 10 to 20 kt. Waves 3 to 5 ft.
.FRIDAY NIGHT...North winds 10 to 15 kt becoming northeast. Waves
1 to 3 ft.
.SATURDAY...Southeast winds 10 to 15 kt becoming south. Waves
1 to 3 ft.
.SUNDAY...West winds 10 to 20 kt. Waves 3 to 5 ft.

$$

LMZ761-190415-
MAFOR 1823/
MICHIGAN NORTH 12100 13800 13500. Waves 2 feet or less.

MICHIGAN SOUTH 11220 13110 11210 11200 12300. Waves 3 to 5 feet
subsiding to 1 to 3 feet tonight. Waves 1 to 3 feet subsiding to
1 foot or less Wednesday.

$$


Quigley

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

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