fzus63 kmkx 040213
glflm 
expires:202609040915;;864910

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
913 pm cdt thu sep 3 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...

no major changes to the synopsis this evening as the overall
pattern and forecast remains largely unchanged. some marine dense
fog may form tonight, mainly over the middle third of the lake,
close to a stalled frontal boundary.

otherwise, the frontal boundary will remain across the great 
lakes region through friday. as this frontal boundary waffles 
north to south across the lake from day to day, generally east to 
northeast winds are expected north of the front, with east to 
southeast winds south of the front. on and off thunderstorms will 
be possible along and north of this frontal boundary through at 
least friday night. then high pressure around 30.1 inches builds 
over hudson bay on saturday, while low pressure around 29.6 inches
moves into the northern great plains. similar to earlier week 
storms, widespread severe weather is not anticipated, though 
isolated stronger storms with hail and gusty winds are possible.


lmz261-362-364-366-563-565-567-868-040915-
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-
913 pm cdt thu sep 3 2026

sheboygan wi to pentwater mi north...

.rest of tonight...east winds 5 to 10 kt increasing to 10 to
15 kt. slight chance of showers and thunderstorms late this
evening, then chance of showers and thunderstorms overnight.
patchy fog overnight. waves 1 to 2 ft. 
.friday...southeast winds 10 to 15 kt becoming east 10 to 20 kt.
patchy fog in the morning. chance of showers and slight chance of
thunderstorms in the morning. waves 1 to 2 ft. 
.friday night...northeast winds 10 to 15 kt becoming east 5 to
10 kt. patchy fog overnight. waves 1 to 2 ft. 
.saturday...east winds 10 to 15 kt becoming northeast. waves 1 to
2 ft. 
.saturday night...northeast winds 10 to 15 kt becoming southeast.
waves 1 to 2 ft. 
.sunday...southeast winds 10 to 15 kt becoming south. waves 1 to
2 ft. 
.sunday night...east winds 5 to 10 kt becoming southeast. waves
1 to 2 ft. 
.monday...south winds 10 to 15 kt. waves 1 to 3 ft. 
.tuesday...south winds to 30 kt. chance of showers. waves 5 to
8 ft occasionally to 10 ft.  

$$

fzus63 kmkx 040213
glflm 
expires:202609040915;;864911

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
913 pm cdt thu sep 3 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...

no major changes to the synopsis this evening as the overall
pattern and forecast remains largely unchanged. some marine dense
fog may form tonight, mainly over the middle third of the lake,
close to a stalled frontal boundary.

otherwise, the frontal boundary will remain across the great 
lakes region through friday. as this frontal boundary waffles 
north to south across the lake from day to day, generally east to 
northeast winds are expected north of the front, with east to 
southeast winds south of the front. on and off thunderstorms will 
be possible along and north of this frontal boundary through at 
least friday night. then high pressure around 30.1 inches builds 
over hudson bay on saturday, while low pressure around 29.6 inches
moves into the northern great plains. similar to earlier week 
storms, widespread severe weather is not anticipated, though 
isolated stronger storms with hail and gusty winds are possible.


lmz080-669-671-673-675-777-779-870-872-874-876-878-040915-
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-
913 pm cdt thu sep 3 2026

sheboygan wi to pentwater mi south...

.rest of tonight...southeast winds 10 to 15 kt. slight chance of
showers and thunderstorms late this evening, then chance of
showers and thunderstorms overnight. patchy fog overnight. waves
1 to 2 ft. 
.friday...east winds 10 to 20 kt becoming southeast late in the
morning, then becoming south 10 to 15 kt early in the afternoon
becoming southeast 5 to 10 kt late. chance of showers and slight
chance of thunderstorms in the morning. waves 1 to 3 ft. 
.friday night...east winds 5 to 10 kt becoming northeast. chance
of showers and thunderstorms. waves 1 to 2 ft. 
.saturday...east winds 10 to 15 kt becoming northeast. chance of
showers in the morning. waves 1 to 3 ft. 
.saturday night...northeast winds 10 to 20 kt becoming east.
waves 2 to 4 ft. 
.sunday...east winds 10 to 15 kt. waves 2 to 4 ft. 
.sunday night...northeast winds 10 to 15 kt becoming southeast.
waves 1 to 3 ft. 
.monday...southeast winds 10 to 15 kt. waves 1 to 3 ft. 
.tuesday...southeast winds to 30 kt becoming south. waves 4 to
7 ft occasionally to 9 ft.  

$$