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(1/5)
Latest Great Lakes Marine Forecast by KMKX
Issued 9/12/2025 10:29 PM US/Central.
Valid through 9/13/2025 4:15 AM US/Central.
fzus63 kmkx 130329
glflm
expires:202509130915;;888168
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
1029 pm cdt fri sep 12 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...
dense fog with visibility below 1 nm is expected to expand and
persist over much of the north half of lake michigan tonight
through mid saturday morning.
low pressure around 29.6 inches over the northern great plains
will remain in place through early next week. lake michigan will
have south to southeast flow overnight into saturday. an area of
showers will cross wi and lake michigan overnight through
saturday afternoon. winds will gradually become northeast saturday
night into sunday as a frontal boundary shifts south and high
pressure around 30.3 inches develops in quebec. high pressure
remains dominant over the upper great lakes monday and tuesday,
with periods of light east to southeast winds (otherwise, light
and variable).
lmz261-362-364-366-563-565-567-669-868-870-130915-
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 sheboygan to port washington wi 5 nm offshore
to mid lake-
lake michigan from pentwater to manistee mi 5 nm offshore to mid
lake-
lake michigan from whitehall to pentwater mi 5 nm offshore to mid
lake-
1029 pm cdt fri sep 12 2025
port washington wi to whitehall mi north...
...dense fog advisory in effect until 10 am cdt saturday...
.rest of tonight...southeast winds 5 to 10 kt becoming south.
patchy dense fog, with the worst of it over western portions of
the lake. slight chance of showers late this evening, then chance
of showers overnight. waves 1 to 2 ft.
.saturday...southeast winds 10 to 15 kt becoming south. patchy
dense fog in the morning. chance of showers in the morning, then
slight chance of showers in the afternoon. waves 1 to 3 ft.
.saturday night...southeast winds 5 to 10 kt becoming east.
patchy fog overnight. waves 1 to 3 ft.
.sunday...northeast winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 2 ft.
.sunday night...northeast winds 10 to 20 kt becoming east 10 to
15 kt. waves 1 to 3 ft.
.monday...southeast winds 10 to 15 kt becoming east 10 to 20 kt.
waves 1 to 3 ft.
.monday night...east winds 10 to 20 kt becoming southeast 5 to
10 kt. waves 1 to 2 ft.
.tuesday...south winds 5 to 10 kt. waves 1 to 2 ft.
.wednesday...south winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 ft or less.
$$
(2/5)
Latest Great Lakes Marine Forecast by KMKX
Issued 9/12/2025 10:29 PM US/Central.
Valid through 9/13/2025 4:15 AM US/Central.
fzus63 kmkx 130329
glflm
expires:202509130915;;888169
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
1029 pm cdt fri sep 12 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...
dense fog with visibility below 1 nm is expected to expand and
persist over much of the north half of lake michigan tonight
through mid saturday morning.
low pressure around 29.6 inches over the northern great plains
will remain in place through early next week. lake michigan will
have south to southeast flow overnight into saturday. an area of
showers will cross wi and lake michigan overnight through
saturday afternoon. winds will gradually become northeast saturday
night into sunday as a frontal boundary shifts south and high
pressure around 30.3 inches develops in quebec. high pressure
remains dominant over the upper great lakes monday and tuesday,
with periods of light east to southeast winds (otherwise, light
and variable).
lmz080-671-673-675-777-779-872-874-876-878-130915-
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 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-
1029 pm cdt fri sep 12 2025
port washington wi to whitehall mi south...
.rest of tonight...southeast winds 10 to 15 kt becoming south.
slight chance of showers overnight. waves 1 to 2 ft.
.saturday...south winds 10 to 15 kt. chance of showers and slight
chance of thunderstorms, mainly in the morning. waves 1 to 3 ft.
.saturday night...southeast winds 10 to 15 kt becoming east 5 to
10 kt. waves 1 to 3 ft.
.sunday...east winds 5 to 10 kt becoming northeast. waves 1 to
2 ft.
.sunday night...northeast winds 10 to 15 kt becoming east. waves
1 to 3 ft.
.monday...east winds 10 to 15 kt becoming northeast 5 to 10 kt.
waves 1 to 3 ft.
.monday night...northeast winds 5 to 10 kt becoming southeast
10 to 15 kt. waves 1 to 2 ft.
.tuesday...southeast winds 5 to 10 kt becoming east. waves 1 to
2 ft.
.wednesday...southeast winds 5 to 10 kt becoming east. waves 1 to
2 ft.
$$
(3/5)
Latest Great Lakes Marine Forecast by KMKX
Issued 9/12/2025 8:52 PM US/Central.
Valid through 9/13/2025 4:30 AM US/Central.
fzus63 kmkx 130152
glflm
expires:202509130930;;885012
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
852 pm cdt fri sep 12 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...
dense fog with visibility below 1 nm is expected to expand and
persist over much of the north half of lake michigan tonight
through mid saturday morning.
low pressure around 29.6 inches over the northern great plains
will remain in place through early next week. lake michigan will
have south to southeast flow overnight into saturday. an area of
showers will cross wi and lake michigan overnight through
saturday afternoon. winds will gradually become northeast saturday
night into sunday as a frontal boundary shifts south and high
pressure around 30.3 inches develops in quebec. high pressure
remains dominant over the upper great lakes monday and tuesday,
with periods of light east to southeast winds (otherwise, light
and variable).
lmz261-362-364-366-563-565-567-868-130930-
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-
852 pm cdt fri sep 12 2025
sheboygan wi to pentwater mi north...
...dense fog advisory in effect until 10 am cdt saturday...
.rest of tonight...southeast winds 5 to 10 kt becoming south.
patchy dense fog. chance of showers overnight. waves 1 ft or
less.
.saturday...southeast winds 10 to 15 kt becoming south. patchy
dense fog in the morning. chance of showers in the morning. waves
1 to 3 ft.
.saturday night...southeast winds 5 to 10 kt becoming east.
patchy fog overnight. waves 1 to 3 ft.
.sunday...northeast winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 2 ft.
.sunday night...northeast winds 10 to 20 kt becoming southeast
10 to 15 kt. waves 1 to 2 ft.
.monday...southeast winds 10 to 15 kt becoming east 10 to 20 kt.
waves 1 to 2 ft.
.monday night...east winds 10 to 20 kt becoming southeast 5 to
10 kt. waves 1 to 2 ft.
.tuesday...south winds 5 to 10 kt. waves 1 ft or less.
.wednesday...south winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 ft or less.
$$
(4/5)
Latest Great Lakes Marine Forecast by KMKX
Issued 9/12/2025 8:52 PM US/Central.
Valid through 9/13/2025 4:30 AM US/Central.
fzus63 kmkx 130152
glflm
expires:202509130930;;885013
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
852 pm cdt fri sep 12 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...
dense fog with visibility below 1 nm is expected to expand and
persist over much of the north half of lake michigan tonight
through mid saturday morning.
low pressure around 29.6 inches over the northern great plains
will remain in place through early next week. lake michigan will
have south to southeast flow overnight into saturday. an area of
showers will cross wi and lake michigan overnight through
saturday afternoon. winds will gradually become northeast saturday
night into sunday as a frontal boundary shifts south and high
pressure around 30.3 inches develops in quebec. high pressure
remains dominant over the upper great lakes monday and tuesday,
with periods of light east to southeast winds (otherwise, light
and variable).
lmz669-671-870-872-130930-
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 whitehall to pentwater mi 5 nm offshore to mid
lake-
lake michigan from grand haven to whitehall mi 5 nm offshore to
mid lake-
852 pm cdt fri sep 12 2025
sheboygan wi to pentwater mi south to north point light wi to
grand haven mi...
...dense fog advisory in effect until 10 pm cdt this evening...
.rest of tonight...southeast winds 5 to 10 kt increasing to 10 to
15 kt. chance of showers overnight. waves 1 to 2 ft.
.saturday...southeast winds 10 to 15 kt becoming south. chance of
showers and slight chance of thunderstorms in the morning, then
slight chance of showers and thunderstorms in the afternoon.
waves 1 to 3 ft.
.saturday night...southeast winds 10 to 15 kt becoming east 5 to
10 kt. waves 1 to 3 ft.
.sunday...east winds 5 to 10 kt becoming northeast 10 to 15 kt.
waves 1 to 2 ft.
.sunday night...northeast winds 10 to 15 kt becoming east. waves
1 to 3 ft.
.monday...southeast winds 10 to 15 kt becoming east 5 to 10 kt.
waves 1 to 3 ft.
.monday night...northeast winds 5 to 10 kt becoming southeast
10 to 15 kt. waves 1 to 2 ft.
.tuesday...southeast winds 5 to 10 kt becoming south. waves 1 to
2 ft.
.wednesday...southeast winds 5 to 10 kt becoming south. waves
1 to 2 ft.
$$
(5/5)
Latest Great Lakes Marine Forecast by KMKX
Issued 9/12/2025 8:52 PM US/Central.
Valid through 9/13/2025 4:30 AM US/Central.
fzus63 kmkx 130152
glflm
expires:202509130930;;885014
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
852 pm cdt fri sep 12 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...
dense fog with visibility below 1 nm is expected to expand and
persist over much of the north half of lake michigan tonight
through mid saturday morning.
low pressure around 29.6 inches over the northern great plains
will remain in place through early next week. lake michigan will
have south to southeast flow overnight into saturday. an area of
showers will cross wi and lake michigan overnight through
saturday afternoon. winds will gradually become northeast saturday
night into sunday as a frontal boundary shifts south and high
pressure around 30.3 inches develops in quebec. high pressure
remains dominant over the upper great lakes monday and tuesday,
with periods of light east to southeast winds (otherwise, light
and variable).
lmz080-673-675-777-779-874-876-878-130930-
lake michigan from michigan city in to st. joseph mi 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 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-
852 pm cdt fri sep 12 2025
north point light wi to grand haven mi south...
.rest of tonight...east winds 10 to 15 kt becoming south. waves
1 to 2 ft.
.saturday...south winds 10 to 15 kt increasing to 10 to 20 kt,
then becoming southeast 10 to 15 kt late. chance of showers and
slight chance of thunderstorms. waves 1 to 3 ft.
.saturday night...southeast winds 10 to 15 kt becoming east 5 to
10 kt. waves 1 to 3 ft.
.sunday...east winds 5 to 10 kt becoming northeast. waves 1 to
2 ft.
.sunday night...northeast winds 10 to 15 kt becoming east. waves
1 to 3 ft.
.monday...east winds 10 to 15 kt becoming northeast 5 to 10 kt.
waves 1 to 3 ft.
.monday night...northeast winds 5 to 10 kt becoming southeast.
waves 1 to 2 ft.
.tuesday...southeast winds 5 to 10 kt becoming northeast. waves
1 to 2 ft.
.wednesday...southeast winds 5 to 10 kt becoming east. waves 1 to
2 ft.
$$
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