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Latest Great Lakes Marine Forecast by KMKX
Issued 4/21/2026 2:30 PM US/Central.
Valid through 4/21/2026 10:15 PM US/Central.
fzus63 kmkx 211930
glflm
expires:202604220315;;761152
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
230 pm cdt tue apr 21 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...
light to modest south winds will shift to light north to
northeasterly tonight, as a weak cold front passes and high
pressure moves across ontario and the northern great lakes.
scattered strong thunderstorms will affect far southern lake
michigan this afternoon.
the high over the northern great lakes will then shift to the
lower great lakes on wednesday. light northeast to east winds on
wednesday will then become southeast wednesday night and increase
thursday into friday, as strong low pressure around 29.2 inches
develops in the northern plains.
lmz261-362-364-366-563-565-567-868-220315-
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-
230 pm cdt tue apr 21 2026
sheboygan wi to pentwater mi north...
.tonight...north winds 5 to 10 kt increasing to 10 to 15 kt.
waves 2 to 4 ft subsiding to 1 to 3 ft.
.wednesday...northeast winds 5 to 10 kt becoming east. waves 1 to
2 ft.
.wednesday night...east winds 5 to 10 kt becoming southeast 10 to
15 kt. waves 1 to 2 ft.
.thursday...southeast winds 10 to 20 kt. waves 2 to 4 ft building
to 4 to 6 ft occasionally to 8 ft.
.thursday night...southeast winds 15 to 25 kt increasing to
30 kt. waves 4 to 7 ft occasionally to 9 ft.
.friday...south winds 15 to 25 kt diminishing to 10 to 20 kt.
chance of rain showers in the morning, then rain showers likely
in the afternoon. waves 4 to 7 ft occasionally to 9 ft.
.friday night...north winds 10 to 20 kt. chance of rain showers.
waves 3 to 5 ft.
.saturday...north winds 10 to 20 kt becoming northeast. waves
3 to 5 ft.
.sunday...northeast winds 10 to 20 kt diminishing to 10 to 15 kt.
waves 1 to 3 ft.
$$
(2/2)
Latest Great Lakes Marine Forecast by KMKX
Issued 4/21/2026 2:30 PM US/Central.
Valid through 4/21/2026 10:15 PM US/Central.
fzus63 kmkx 211930
glflm
expires:202604220315;;761153
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
230 pm cdt tue apr 21 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...
light to modest south winds will shift to light north to
northeasterly tonight, as a weak cold front passes and high
pressure moves across ontario and the northern great lakes.
scattered strong thunderstorms will affect far southern lake
michigan this afternoon.
the high over the northern great lakes will then shift to the
lower great lakes on wednesday. light northeast to east winds on
wednesday will then become southeast wednesday night and increase
thursday into friday, as strong low pressure around 29.2 inches
develops in the northern plains.
lmz080-669-671-673-675-777-779-870-872-874-876-878-220315-
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-
230 pm cdt tue apr 21 2026
sheboygan wi to pentwater mi south...
.tonight...south winds 10 to 15 kt backing to north. patchy fog.
waves 2 to 4 ft subsiding to 1 to 3 ft.
.wednesday...northeast winds 5 to 10 kt. patchy fog in the
morning. waves 1 to 2 ft.
.wednesday night...east winds 5 to 10 kt veering to south 10 to
15 kt. waves 1 to 3 ft.
.thursday...south winds 10 to 20 kt. waves 2 to 4 ft building to
4 to 6 ft occasionally to 8 ft.
.thursday night...south winds 15 to 25 kt. waves 4 to 7 ft
occasionally to 9 ft.
.friday...south winds 15 to 25 kt diminishing to 10 to 20 kt.
chance of rain showers in the morning, then rain showers likely
in the afternoon. waves 4 to 7 ft occasionally to 9 ft.
.friday night...northwest winds 10 to 20 kt becoming north.
chance of rain showers. waves 3 to 5 ft.
.saturday...north winds 10 to 20 kt. waves 3 to 5 ft.
.sunday...northeast winds 10 to 20 kt diminishing to 10 to 15 kt.
waves 3 to 5 ft.
$$
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