fzus63 kmkx 180813
glflm 
expires:202604181515;;571003

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
313 am cdt sat apr 18 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...

breezy northwest winds continue to build in behind a cold front,
overspreading the lake and achieving 20 to 30 kt gusts through
today. low pressure continues its northeastward track across 
ontario canada and james bay today, with high pressure systems 
over the southern plains and saskatchewan/manitoba canada 
maintaining a tight pressure gradient and breezy west to northwest
winds. high pressure builds its way into the midwestern us states
through sunday / monday, with continued northwest wind flow 
sunday then light and variable winds into monday morning as the 
high makes its closest approach to lake michigan. as the high 
exits east, expecting breezy southerly winds monday afternoon and 
night. 


lmz261-362-364-366-563-565-567-868-181515-
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-
313 am cdt sat apr 18 2026

sheboygan wi to pentwater mi north...

...dense fog advisory in effect until 4 am cdt early this
morning...

.today...northwest winds to 30 kt becoming west. waves 4 to 6 ft
occasionally to 8 ft. 
.tonight...west winds to 30 kt diminishing to 15 to 25 kt. waves
4 to 6 ft occasionally to 8 ft. 
.sunday...west winds 15 to 25 kt becoming north. waves 2 to 4 ft.
.sunday night...north winds 15 to 25 kt diminishing to 10 to
20 kt. waves 2 to 4 ft. 
.monday...west winds 10 to 15 kt becoming south 10 to 20 kt.
waves 1 to 2 ft building to 2 to 4 ft. 
.monday night...south winds to 30 kt. waves 5 to 8 ft
occasionally to 10 ft. 
.tuesday...southwest winds to 30 kt diminishing to 10 to 20 kt.
waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft
occasionally to 8 ft. 
.wednesday...northeast winds 10 to 15 kt diminishing to 5 to
10 kt. waves 1 to 2 ft.  

$$

fzus63 kmkx 180813
glflm 
expires:202604181515;;571004

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
313 am cdt sat apr 18 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...

breezy northwest winds continue to build in behind a cold front,
overspreading the lake and achieving 20 to 30 kt gusts through
today. low pressure continues its northeastward track across 
ontario canada and james bay today, with high pressure systems 
over the southern plains and saskatchewan/manitoba canada 
maintaining a tight pressure gradient and breezy west to northwest
winds. high pressure builds its way into the midwestern us states
through sunday / monday, with continued northwest wind flow 
sunday then light and variable winds into monday morning as the 
high makes its closest approach to lake michigan. as the high 
exits east, expecting breezy southerly winds monday afternoon and 
night. 


lmz080-669-671-673-675-777-779-870-872-874-876-878-181515-
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-
313 am cdt sat apr 18 2026

sheboygan wi to pentwater mi south...

...dense fog advisory in effect until 4 am cdt early this
morning...

.today...west winds to 30 kt diminishing to 15 to 25 kt. slight
chance of rain showers this morning. waves 4 to 6 ft occasionally
to 8 ft. 
.tonight...west winds 15 to 25 kt diminishing to 10 to 20 kt.
waves 4 to 6 ft occasionally to 8 ft. 
.sunday...west winds 10 to 20 kt becoming northwest. waves 3 to
5 ft. 
.sunday night...north winds 10 to 20 kt becoming northeast 10 to
15 kt. waves 2 to 4 ft. 
.monday...east winds 5 to 10 kt becoming southeast 10 to 20 kt in
the afternoon. waves 1 to 2 ft building to 2 to 4 ft. 
.monday night...southeast winds 15 to 25 kt becoming south to
30 kt. waves 4 to 7 ft occasionally to 9 ft. 
.tuesday...south winds to 30 kt diminishing to 10 to 20 kt. waves
4 to 7 ft occasionally to 9 ft. 
.wednesday...northeast winds 10 to 15 kt diminishing to 5 to
10 kt. waves 2 to 4 ft.  

$$