fzus63 kmkx 202059
glflm 
expires:202608210315;;069691

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
359 pm cdt thu aug 20 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 continues to track through the 
western great lakes region this afternoon. as the high pressure 
exits to the southeast later tonight, south to southwest winds 
will develop. theses winds will increase for friday, along with 
shower and thunderstorm chances, as low pressure around 29.8 
inches moves across the region and drags a cold front through lake
michigan. gusty winds will then shift to the northwest later 
friday night into saturday after the front exits. another high 
pressure system around 30.2 inches is expected to build into the 
region later this weekend, which may maintain gusty northerly 
winds as it moves in.


lmz261-362-364-366-563-565-567-868-210315-
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-
359 pm cdt thu aug 20 2026

sheboygan wi to pentwater mi north...

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

$$

fzus63 kmkx 202059
glflm 
expires:202608210315;;069692

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
359 pm cdt thu aug 20 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 continues to track through the 
western great lakes region this afternoon. as the high pressure 
exits to the southeast later tonight, south to southwest winds 
will develop. theses winds will increase for friday, along with 
shower and thunderstorm chances, as low pressure around 29.8 
inches moves across the region and drags a cold front through lake
michigan. gusty winds will then shift to the northwest later 
friday night into saturday after the front exits. another high 
pressure system around 30.2 inches is expected to build into the 
region later this weekend, which may maintain gusty northerly 
winds as it moves in.


lmz080-669-671-673-675-777-779-870-872-874-876-878-210315-
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-
359 pm cdt thu aug 20 2026

sheboygan wi to pentwater mi south...

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

$$