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Latest Great Lakes Marine Forecast by KMKX
Issued 9/15/2025 3:19 AM US/Central.
Valid through 9/15/2025 10:30 AM US/Central.
fzus63 kmkx 150819
glflm
expires:202509151530;;012123
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
319 am cdt mon sep 15 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...
no major changes to the going synopsis.
weakening low pressure around 29.7 inches over the northern
great plains will remain nearly stationary through at least
wednesday, with broad high pressure of 30.2 inches dominating
our weather pattern. light (10kt or less) easterly winds are
expected during this time over lake michigan, keeping waves in
the 1 to 3 foot range, and usually on the lower end of that
range. will need to continue to monitor for areas of dense fog
development from time to time.
lmz261-362-364-366-563-565-567-669-868-870-151530-
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-
319 am cdt mon sep 15 2025
port washington wi to whitehall mi north...
.today...southeast winds 10 to 15 kt. waves 1 to 2 ft.
.tonight...northeast winds 10 to 15 kt veering to southeast.
waves 1 to 2 ft.
.tuesday...southeast winds 10 to 15 kt becoming south. waves 1 to
2 ft.
.tuesday night...southeast winds 5 to 10 kt becoming south. waves
1 ft or less.
.wednesday...south winds 10 to 15 kt becoming southwest. waves
1 ft or less.
.wednesday night...southwest winds 5 to 10 kt becoming west.
waves 1 ft or less.
.thursday...north winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 to 2 ft.
.friday...northeast winds 10 to 20 kt. waves 2 to 4 ft.
$$
(2/2)
Latest Great Lakes Marine Forecast by KMKX
Issued 9/15/2025 3:19 AM US/Central.
Valid through 9/15/2025 10:30 AM US/Central.
fzus63 kmkx 150819
glflm
expires:202509151530;;012124
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
319 am cdt mon sep 15 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...
no major changes to the going synopsis.
weakening low pressure around 29.7 inches over the northern
great plains will remain nearly stationary through at least
wednesday, with broad high pressure of 30.2 inches dominating
our weather pattern. light (10kt or less) easterly winds are
expected during this time over lake michigan, keeping waves in
the 1 to 3 foot range, and usually on the lower end of that
range. will need to continue to monitor for areas of dense fog
development from time to time.
lmz080-671-673-675-777-779-872-874-876-878-151530-
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-
319 am cdt mon sep 15 2025
port washington wi to whitehall mi south...
.today...southeast winds 10 to 20 kt becoming east 10 to 15 kt
early this afternoon, then becoming north 5 to 10 kt late. waves
1 to 3 ft.
.tonight...northeast winds 10 to 15 kt veering to southeast.
waves 1 to 2 ft.
.tuesday...southeast winds 10 to 15 kt backing to north 5 to
10 kt. waves 1 to 2 ft.
.tuesday night...northeast winds 5 to 10 kt becoming east. waves
1 ft or less.
.wednesday...southeast winds 5 to 10 kt becoming east. waves 1 ft
or less.
.wednesday night...northeast winds 5 to 10 kt veering to
southeast. waves 1 ft or less.
.thursday...east winds 5 to 10 kt backing to north. waves 1 to
2 ft.
.friday...northeast winds 10 to 15 kt increasing to 10 to 20 kt.
waves 2 to 4 ft.
$$
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