735
FZUS63 KMKX 010216
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
916 PM CDT Mon Aug 31 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...

29.5 inch low pressure is located near the Ontario-Manitoba
border late this evening, and is forecast to continue eastward
toward the southern Hudson Bay by early Wednesday morning. The low
will make its eastward progression as it fills to near 29.8 inches,
resulting in light winds during overnight periods and southerly
gusts between 10-15 knots during the daytime hours. The light
overnight winds, combined with a lingering humid air mass, will
support areas of fog development across Lake Michigan both tonight
and Tuesday night. Whether fog will become dense remains
uncertain, with trends being monitored for Marine Dense Fog
Advisories during each overnight period. Off and on thunderstorms
remain forecast through Wednesday morning as a cold front lingers
just to the north of the open waters. Widespread severe weather
isn`t expected in any thunderstorm activity, though an isolated
stronger cell with hail and gusty winds can`t be entirely ruled
out.

Winds will shift east-northeasterly through the second half of the
week as 30.1 inch high pressure builds over the Hudson Bay and
broad, 29.6 inch low pressure moves into the northern Great
Plains. An unsettled pattern featuring multiple additional
thunderstorm chances will continue through at least Friday night.
Similar to earlier week storms, widespread severe weather isn`t
anticipated, though isolated stronger storms with hail and gusty
winds are possible.

LMZ261-362-364-366-563-565-567-868-010930-
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-
916 PM CDT Mon Aug 31 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...Southwest winds 10 to 15 kt veering to
northwest. Chance of showers and slight chance of thunderstorms
late this evening. Patchy fog. Waves 3 to 5 ft subsiding to 1 to
3 ft.
.TUESDAY...Northeast winds 5 to 10 kt veering to south late in
the morning, then increasing to 10 to 15 kt early in the
afternoon becoming south 10 to 15 kt late. Patchy fog in the
morning. Waves 1 to 3 ft.
.TUESDAY NIGHT...South winds 10 to 15 kt veering to west 5 to
10 kt. Waves 1 to 2 ft.
.WEDNESDAY...Northwest winds 10 to 15 kt becoming north. Chance
of showers. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...Northeast winds 5 to 10 kt. Waves 1 to 2 ft.
.THURSDAY...Northeast winds 5 to 10 kt increasing to 10 to 15 kt.
Chance of showers in the afternoon. Waves 1 ft or less.
.THURSDAY NIGHT...Northeast winds 10 to 15 kt diminishing to 5 to
10 kt. Chance of showers. Waves 1 ft or less.
.FRIDAY...East winds 5 to 10 kt becoming northeast 10 to 15 kt.
Waves 1 ft or less.
.SATURDAY...East winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-010930-
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-
916 PM CDT Mon Aug 31 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...Southwest winds 10 to 15 kt diminishing to
5 to 10 kt. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.TUESDAY...West winds 5 to 10 kt becoming south 10 to 15 kt.
Patchy fog in the morning. Waves 1 to 3 ft.
.TUESDAY NIGHT...Southwest winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 2 ft.
.WEDNESDAY...South winds 10 to 15 kt. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...Northwest winds 10 to 15 kt becoming north.
Chance of showers overnight. Waves 1 to 3 ft.
.THURSDAY...Northeast winds 5 to 10 kt becoming north 10 to
15 kt. Chance of showers and thunderstorms in the morning. Waves
1 to 2 ft.
.THURSDAY NIGHT...Northeast winds 10 to 15 kt becoming east 5 to
10 kt. Chance of showers and thunderstorms. Waves 1 to 2 ft.
.FRIDAY...East winds 10 to 15 kt becoming northeast. Chance of
showers. Waves 1 to 2 ft.
.SATURDAY...East winds 10 to 15 kt. Waves 2 to 4 ft.

$$

LMZ761-010930-
MAFOR 0104/
MICHIGAN NORTH 11510 11600 11800 19804 11300 13410 11510. A
chance of showers late this evening. Waves 2 to 4 feet subsiding
to 1 to 3 feet overnight. Waves 2 feet or less Tuesday and
Tuesday evening.

MICHIGAN SOUTH 11510 11500 11600 11500 11510 12410 11510. Waves 1
to 3 feet overnight. Waves 2 feet or less Tuesday and Tuesday
evening.

$$


Quigley

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

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