fzus63 kmkx 211230
glflm 
expires:202608212100;;107326

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
730 am cdt fri aug 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...

south to southwest winds will increase today as a low pressure
trough of 29.8 inches approaches southern wisconsin from the 
minnesota arrowhead. thunderstorms are expected at times today
through tonight. the trough will cross lake michigan from north 
to south tonight and bring a wind shift to the northwest. then look
for gusty northerly winds to develop along a cold front that will
track from north to south down lake michigan saturday evening. a 
few thunderstorms are possible along this front. northerly winds
will persist through sunday as low pressure around 29.6 inches
tracks from lower michigan to ontario. variable winds are 
expected for monday and tuesday as high pressure of 30.1 inches 
crosses the upper great lakes.


lmz261-362-364-366-563-565-567-868-212100-
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-
730 am cdt fri aug 21 2026

sheboygan wi to pentwater mi north...

.rest of today...south winds 10 to 20 kt increasing to 15 to
25 kt. chance of showers and slight chance of thunderstorms this
morning, then chance of showers and thunderstorms this afternoon.
waves 3 to 5 ft. 
.tonight...south winds 15 to 25 kt becoming southwest 10 to 20 kt
late in the evening, then becoming west 10 to 15 kt after
midnight becoming north 10 to 20 kt late. chance of showers and
thunderstorms in the evening, then chance of showers and slight
chance of thunderstorms overnight. waves 3 to 5 ft subsiding to
2 to 4 ft. 
.saturday...north winds 10 to 20 kt increasing to 30 kt. waves
2 to 4 ft. 
.saturday night...north winds to 30 kt diminishing to 15 to
25 kt. chance of showers in the evening. waves 4 to 6 ft
occasionally to 8 ft. 
.sunday...north winds to 30 kt. waves 4 to 6 ft occasionally to
8 ft. 
.sunday night...north gales to 35 kt diminishing to 10 to 20 kt.
waves 3 to 5 ft subsiding to 1 to 3 ft. 
.monday...northwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 2 ft. 
.tuesday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft building to 2 to 4 ft.  

$$

fzus63 kmkx 211230
glflm 
expires:202608212100;;107327

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
730 am cdt fri aug 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...

south to southwest winds will increase today as a low pressure
trough of 29.8 inches approaches southern wisconsin from the 
minnesota arrowhead. thunderstorms are expected at times today
through tonight. the trough will cross lake michigan from north 
to south tonight and bring a wind shift to the northwest. then look
for gusty northerly winds to develop along a cold front that will
track from north to south down lake michigan saturday evening. a 
few thunderstorms are possible along this front. northerly winds
will persist through sunday as low pressure around 29.6 inches
tracks from lower michigan to ontario. variable winds are 
expected for monday and tuesday as high pressure of 30.1 inches 
crosses the upper great lakes.


lmz080-669-671-673-675-777-779-870-872-874-876-878-212100-
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-
730 am cdt fri aug 21 2026

sheboygan wi to pentwater mi south...

.rest of today...south winds 10 to 20 kt. slight chance of
showers this morning, then chance of showers and thunderstorms
this afternoon. waves 2 to 4 ft. 
.tonight...south winds 10 to 20 kt veering to northwest. chance
of showers and thunderstorms in the evening, then chance of
showers and slight chance of thunderstorms overnight. waves 2 to
4 ft subsiding to 1 to 3 ft. 
.saturday...northwest winds 10 to 20 kt becoming north 15 to
25 kt. waves 3 to 5 ft. 
.saturday night...north winds 15 to 25 kt. waves 3 to 5 ft
building to 4 to 6 ft occasionally to 8 ft. 
.sunday...north winds to 30 kt. waves 4 to 7 ft occasionally to
9 ft. 
.sunday night...north winds 15 to 25 kt diminishing to 10 to
15 kt. waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft. 
.monday...northwest winds 10 to 20 kt becoming north. waves 1 to
2 ft. 
.tuesday...south winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft building to 2 to 4 ft.  

$$