350
FZUS63 KMKX 200810
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
310 AM CDT Sun Apr 20 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...

The high pressure around 30.5 inches will shift eastward today as
low pressure around 29.5 inches lifts into the area from the
southern Plains. Expect increasing east to northeasterly winds to
develop through the day as Lake Michigan sits in between the
departing high and an approaching low. The low pressure will lift
across the northern half of the lake on Monday with gusty
southerly winds then turning westerly across the lake as it
departs. Gusts to around 30 knots are expected, but some gales
can not be ruled out, especially over the western and central
portions of Lake Michigan through Monday. Lighter winds are
expected Tuesday into the middle of the week as high pressure
builds in behind the early week system.

LMZ261-362-364-366-563-565-567-868-201515-
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-
310 AM CDT Sun Apr 20 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...East winds 10 to 15 kt becoming northeast 10 to 20 kt.
Waves 1 to 3 ft.
.TONIGHT...East winds 15 to 25 kt increasing to gales to 35 kt.
Rain showers likely in the evening, then rain showers overnight.
Waves 3 to 5 ft building to 7 to 10 ft occasionally to 13 ft.
.MONDAY...East gales to 35 kt veering to southwest to 30 kt. Rain
showers. Waves 8 to 11 ft occasionally to 14 ft.
.MONDAY NIGHT...West winds to 30 kt. Chance of rain showers in
the evening. Waves 6 to 9 ft occasionally to 12 ft subsiding to
4 to 6 ft occasionally to 8 ft.
.TUESDAY...Northwest winds 15 to 25 kt becoming southwest 10 to
20 kt. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.TUESDAY NIGHT...Southeast winds 10 to 15 kt becoming east.
Chance of rain showers. Waves 1 to 2 ft.
.WEDNESDAY...Southeast winds 10 to 15 kt becoming south. Waves
1 to 3 ft.
.THURSDAY...East winds 10 to 15 kt becoming northeast. Waves 1 to
3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-201515-
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-
310 AM CDT Sun Apr 20 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...East winds 10 to 20 kt increasing to 15 to 25 kt. Chance
of rain showers this afternoon. Waves 1 to 3 ft building to 3 to
5 ft.
.TONIGHT...East winds to 30 kt nearing southeast gales to 35 kt.
Chance of rain showers and slight chance of thunderstorms in the
evening, then rain showers and slight chance of thunderstorms
overnight. Waves 4 to 6 ft occasionally to 8 ft building to 8 to
11 ft occasionally to 14 ft.
.MONDAY...South winds to 30 kt nearing southwest gales to 35 kt.
Chance of rain showers in the morning. Waves 8 to 11 ft
occasionally to 14 ft.
.MONDAY NIGHT...West winds to 30 kt diminishing to 15 to 25 kt.
Waves 6 to 9 ft occasionally to 12 ft subsiding to 4 to 6 ft
occasionally to 8 ft.
.TUESDAY...Northwest winds 10 to 20 kt backing to southeast 10 to
15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.TUESDAY NIGHT...East winds 10 to 15 kt becoming southeast. Rain
showers likely. Waves 1 to 3 ft.
.WEDNESDAY...South winds 10 to 15 kt becoming southeast. Waves
1 to 3 ft.
.THURSDAY...East winds 10 to 15 kt increasing to 10 to 20 kt.
Chance of rain showers. Waves 1 to 3 ft.

$$

LMZ761-201515-
MAFOR 2010/
MICHIGAN NORTH 12210 11110 11120 11130 11236 12246. Waves 2 feet
or less today. Waves 2 to 4 feet building to 5 to 8 feet tonight.

MICHIGAN SOUTH 14220 11230 11240 11256 11356. Waves 1 to 3 feet
building to 2 to 4 feet today. Waves 3 to 5 feet building to 6 to
10 feet 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