(1/4)
Latest Great Lakes Marine Forecast by KMKX
Issued 7/8/2026 8:43 PM US/Central.
Valid through 7/9/2026 4:15 AM US/Central.
fzus63 kmkx 090143
glflm
expires:202607090915;;650229
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
843 pm cdt wed jul 8 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...
high pressure around 30.0 inches will remain over the ohio river
valley through tonight. light south winds will continue tonight,
as weak low pressure around 29.8 inches and an accompanying cold
front approaches from upper michigan and northwest wisconsin.
light winds will become north behind the frontal passage thursday
into thursday night. winds will become north to northeast on
friday, as high pressure around 30.0 inches builds into the the
region from the northwest. the high should continue to bring
light to modest winds for the weekend.
lmz563-565-567-090915-
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-
843 pm cdt wed jul 8 2026
rock island passage to charlevoix mi south to sheboygan wi to
pentwater mi...
...severe thunderstorm watch 471 in effect until 10 pm cdt this
evening...
.rest of tonight...south winds 10 to 15 kt becoming southwest
5 to 10 kt. patchy fog. showers likely with a chance of
thunderstorms. with damaging winds and large hail through early
evening. waves 1 to 2 ft.
.thursday...southwest winds 5 to 10 kt veering to north 10 to
15 kt. patchy fog in the morning. chance of showers and slight
chance of thunderstorms in the morning, then slight chance of
showers in the afternoon. waves 1 to 2 ft.
.thursday night...north winds 5 to 10 kt. waves 1 to 2 ft.
.friday...northeast winds 10 to 15 kt. waves 1 to 2 ft.
.friday night...northeast winds 10 to 15 kt diminishing to 5 to
10 kt. waves 1 to 2 ft.
.saturday...east winds 5 to 10 kt becoming northeast. waves 1 ft
or less.
.saturday night...east winds 5 to 10 kt veering to south. waves
nearly calm.
.sunday...southwest winds 10 to 15 kt becoming south 10 to 20 kt.
waves 1 to 2 ft.
.monday...southwest winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 2 ft.
$$
(2/4)
Latest Great Lakes Marine Forecast by KMKX
Issued 7/8/2026 8:43 PM US/Central.
Valid through 7/9/2026 4:15 AM US/Central.
fzus63 kmkx 090143
glflm
expires:202607090915;;650231
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
843 pm cdt wed jul 8 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...
high pressure around 30.0 inches will remain over the ohio river
valley through tonight. light south winds will continue tonight,
as weak low pressure around 29.8 inches and an accompanying cold
front approaches from upper michigan and northwest wisconsin.
light winds will become north behind the frontal passage thursday
into thursday night. winds will become north to northeast on
friday, as high pressure around 30.0 inches builds into the the
region from the northwest. the high should continue to bring
light to modest winds for the weekend.
lmz669-090915-
lake michigan from sheboygan to port washington wi 5 nm offshore
to mid lake-
843 pm cdt wed jul 8 2026
sheboygan wi to pentwater mi south to port washington wi to
whitehall mi...
...severe thunderstorm watch 471 in effect until 10 pm cdt this
evening...
.rest of tonight...south winds 10 to 15 kt diminishing to 5 to
10 kt. showers with a chance of thunderstorms through early
evening, then showers likely with a chance of thunderstorms
overnight. patchy fog overnight. with damaging winds and large
hail through early evening. waves 1 to 2 ft.
.thursday...south winds 5 to 10 kt backing to northeast 10 to
15 kt. patchy fog in the morning. chance of showers and slight
chance of thunderstorms in the morning, then slight chance of
showers and thunderstorms in the afternoon. waves 1 ft or less.
.thursday night...northeast winds 5 to 10 kt becoming north 10 to
15 kt. waves 1 to 2 ft.
.friday...north winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 3 ft.
.friday night...north winds 10 to 20 kt becoming northeast 10 to
15 kt. waves 1 to 3 ft.
.saturday...northeast winds 5 to 10 kt. waves 1 to 2 ft.
.saturday night...northeast winds 5 to 10 kt becoming east. waves
1 ft or less.
.sunday...south winds 5 to 10 kt increasing to 10 to 15 kt. waves
1 ft or less.
.monday...west winds 5 to 10 kt becoming south 10 to 15 kt. waves
1 ft or less.
$$
(3/4)
Latest Great Lakes Marine Forecast by KMKX
Issued 7/8/2026 8:43 PM US/Central.
Valid through 7/9/2026 4:15 AM US/Central.
fzus63 kmkx 090143
glflm
expires:202607090915;;650228
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
843 pm cdt wed jul 8 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...
high pressure around 30.0 inches will remain over the ohio river
valley through tonight. light south winds will continue tonight,
as weak low pressure around 29.8 inches and an accompanying cold
front approaches from upper michigan and northwest wisconsin.
light winds will become north behind the frontal passage thursday
into thursday night. winds will become north to northeast on
friday, as high pressure around 30.0 inches builds into the the
region from the northwest. the high should continue to bring
light to modest winds for the weekend.
lmz261-362-364-366-868-090915-
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 pentwater to manistee mi 5 nm offshore to mid
lake-
843 pm cdt wed jul 8 2026
rock island passage to charlevoix mi north...
.rest of tonight...southwest winds 10 to 15 kt diminishing to
5 to 10 kt. patchy fog. showers likely with a chance of
thunderstorms. waves 1 to 2 ft.
.thursday...north winds 10 to 15 kt becoming northwest. patchy
fog in the morning. chance of showers and slight chance of
thunderstorms in the morning. waves 1 to 2 ft.
.thursday night...northwest winds 10 to 15 kt becoming north 5 to
10 kt. waves 1 to 2 ft.
.friday...north winds 10 to 15 kt increasing to 15 to 25 kt in
the afternoon. waves 1 to 2 ft building to 1 to 3 ft.
.friday night...northeast winds 10 to 20 kt becoming east 5 to
10 kt overnight. waves 1 to 3 ft subsiding to 1 to 2 ft.
.saturday...east winds 5 to 10 kt backing to north 10 to 20 kt in
the afternoon. waves 1 to 2 ft.
.saturday night...east winds 10 to 20 kt veering to south 10 to
15 kt. waves 1 to 2 ft.
.sunday...southwest winds 10 to 20 kt. waves 1 to 3 ft.
.monday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft.
$$
(4/4)
Latest Great Lakes Marine Forecast by KMKX
Issued 7/8/2026 8:43 PM US/Central.
Valid through 7/9/2026 4:15 AM US/Central.
fzus63 kmkx 090143
glflm
expires:202607090915;;650230
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
843 pm cdt wed jul 8 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...
high pressure around 30.0 inches will remain over the ohio river
valley through tonight. light south winds will continue tonight,
as weak low pressure around 29.8 inches and an accompanying cold
front approaches from upper michigan and northwest wisconsin.
light winds will become north behind the frontal passage thursday
into thursday night. winds will become north to northeast on
friday, as high pressure around 30.0 inches builds into the the
region from the northwest. the high should continue to bring
light to modest winds for the weekend.
lmz080-671-673-675-777-779-870-872-874-876-878-090915-
lake michigan from michigan city in to st. joseph mi 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-
843 pm cdt wed jul 8 2026
port washington wi to whitehall mi south...
.rest of tonight...south winds 10 to 15 kt diminishing to 5 to
10 kt. chance of showers and thunderstorms through early evening,
then chance of showers and slight chance of thunderstorms
overnight. waves 1 to 2 ft.
.thursday...south winds 10 to 15 kt. chance of showers and slight
chance of thunderstorms in the morning, then chance of showers
and thunderstorms in the afternoon. waves 1 ft or less.
.thursday night...north winds 10 to 15 kt diminishing to 5 to
10 kt. chance of thunderstorms in the evening. waves 1 to 2 ft.
.friday...north winds 10 to 15 kt increasing to 15 to 25 kt in
the afternoon. waves 1 to 3 ft building to 2 to 4 ft.
.friday night...north winds 15 to 25 kt becoming northeast 10 to
15 kt overnight. waves 2 to 4 ft.
.saturday...east winds 10 to 15 kt becoming north 10 to 20 kt.
waves 1 to 3 ft.
.saturday night...northeast winds 10 to 20 kt becoming east 5 to
10 kt. waves 1 to 2 ft.
.sunday...southeast winds 5 to 10 kt becoming east. waves 1 ft or
less.
.monday...west winds 10 to 15 kt becoming southwest 10 to 20 kt.
waves 1 to 2 ft.
$$
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