801
FZUS63 KMKX 171354
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
854 AM CDT Sat May 17 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...

Breezy west-southwest winds continue across Lake Michigan this
morning as 29.3 inch low pressure lingers near the northern open
waters. Breezy conditions will continue through today as the
aforementioned area of low pressure migrates toward the Ontario-
Quebec border. Wind directions will turn west-northwesterly
tonight as 30.4 inch high pressure moves toward the Hudson Bay
vicinity. The approach of this area of high pressure will allow
winds to taper during the second half of the overnight hours
tonight. Winds will turn due northerly during the day on Sunday as
high pressure pivots into far northern Ontario.

Wind speeds will increase during the day on Monday as 30.5 inch high
pressure lingers over the Hudson Bay vicinity and 29.5 inch low
pressure forms in the central Great Plains. Brisk winds will
continue into the day on Tuesday, shifting east-northeasterly as
the aforementioned area of low pressure moves into the Ohio River
Valley during the afternoon hours. The low will move into the
Appalachian Mountains on Wednesday, resulting in a northerly wind
shift across Lake Michigan. Given that low pressure will be
approaching and passing to the south of the open waters, winds
will be gusty on both Tuesday and Wednesday. Gales are not
anticipated at this time, though trends will continue to be
monitored in the coming forecasts. The approaching low will also
bring chances for showers and isolated thunderstorms, with severe
weather not expected. Winds will gradually taper Thursday into
Friday, when 30.2 inch high pressure is forecast to settle into
the western Great Lakes.

LMZ261-362-364-366-563-565-567-868-172115-
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-
854 AM CDT Sat May 17 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...Southwest winds 10 to 20 kt becoming west 15 to
25 kt. Chance of showers. Waves 3 to 5 ft.
.TONIGHT...West winds 15 to 25 kt becoming northwest. Slight
chance of rain showers in the evening. Waves 3 to 5 ft.
.SUNDAY...North winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft.
.SUNDAY NIGHT...North winds 10 to 20 kt. Waves 2 to 4 ft.
.MONDAY...Northeast winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft.
.MONDAY NIGHT...Northeast winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft.
.TUESDAY...Northeast winds 15 to 25 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.WEDNESDAY...Northeast winds 15 to 25 kt becoming north to 30 kt.
Waves 4 to 7 ft occasionally to 9 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-172115-
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-
854 AM CDT Sat May 17 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...West winds to 30 kt. Slight chance of showers
through mid morning, then chance of sprinkles this afternoon.
Waves 4 to 7 ft occasionally to 9 ft.
.TONIGHT...West winds to 30 kt becoming northwest 10 to 20 kt.
Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft.
.SUNDAY...Northwest winds 10 to 20 kt becoming north 15 to 25 kt.
Waves 3 to 5 ft.
.SUNDAY NIGHT...North winds 10 to 20 kt. Waves 3 to 5 ft.
.MONDAY...Northeast winds 10 to 20 kt becoming north 15 to 25 kt.
Waves 4 to 6 ft occasionally to 8 ft.
.MONDAY NIGHT...Northeast winds 15 to 25 kt becoming east. Waves
4 to 6 ft occasionally to 8 ft.
.TUESDAY...East winds to 30 kt becoming northeast. Chance of
showers. Waves 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...Northeast winds to 30 kt becoming north. Chance of
showers. Waves 6 to 9 ft occasionally to 12 ft.

$$

LMZ761-172115-
MAFOR 1716/
MICHIGAN NORTH 13630 13730 11820 11720. A chance of showers this
afternoon. Waves 2 to 4 feet building to 3 to 5 feet this
afternoon. Waves 3 to 5 feet subsiding to 2 to 4 feet tonight.
Waves 1 to 3 feet Sunday morning.

MICHIGAN SOUTH 13640 11630 11730 12720 11820. Waves 3 to 6 feet
this afternoon. Waves 3 to 5 feet subsiding to 2 to 4 feet
tonight. Waves 2 to 4 feet Sunday morning.

$$


Sheppard

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

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