fzus63 kmkx 180119
glflm 
expires:202609180915;;630543

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
819 pm cdt thu sep 17 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...

30.4 inch high pressure will shift from the canadian great plains
into ontario tonight, maintaining east-northeast winds across 
lake michigan. 29.9 inch low pressure will develop near the 
missouri river friday afternoon, moving over or just south of 
waters during the day on saturday. winds will veer east- 
southeasterly ahead of the low, becoming gusty at points. a few 
gusts could approach gale thresholds, particularly on friday night
and saturday morning. not expecting any borderline gales to be 
prolonged or widespread enough to warrant gale warnings, but will 
continue to monitor trends. areas of widespread showers & storms 
will accompany the approaching/passing area of low pressure friday
night through at least saturday night, with widespread severe 
weather not expected at this time. 

winds will trend northeasterly sunday through monday night as the 
aforementioned area of low pressure slowly moves into the ohio river 
valley. additional rain showers will accompany the passing low, with 
thunder and severe weather hazards appearing unlikely at this time. 
30.5 inch high pressure will concurrently slide into ontario from
the canadian great plains, with a compacted pressure gradient 
allowing for gusty winds through most of the late weekend/early 
week time frame. similar to saturday, gusts could occasionally 
approach gale thresholds during the sunday-monday night time 
frame, with conditions not expected to be widespread enough for 
gale warnings at this time. winds will steadily taper tuesday 
through wednesday as a new area of 30.3 inch high pressure builds
into northern wisconsin.


lmz261-362-364-366-563-565-567-868-180915-
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-
819 pm cdt thu sep 17 2026

sheboygan wi to pentwater mi north...

.rest of tonight...north winds 10 to 15 kt becoming northeast
10 to 20 kt. waves 1 to 3 ft. 
.friday...northeast winds 10 to 20 kt. chance of showers in the
afternoon. waves 2 to 4 ft. 
.friday night...east winds 10 to 20 kt becoming southeast 15 to
25 kt. showers likely in the evening, then showers overnight.
waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft. 
.saturday...southeast winds 15 to 25 kt becoming east. chance of
showers. waves 4 to 7 ft occasionally to 9 ft. 
.saturday night...east winds 10 to 20 kt becoming northeast.
chance of showers. waves 4 to 6 ft occasionally to 8 ft subsiding
to 2 to 4 ft. 
.sunday...northeast winds 15 to 25 kt increasing to 30 kt. waves
4 to 6 ft occasionally to 8 ft building to 5 to 8 ft occasionally
to 10 ft. 
.sunday night...northeast winds to 30 kt becoming east 15 to
25 kt. waves 6 to 9 ft occasionally to 12 ft. 
.monday...east winds 10 to 20 kt becoming northeast 15 to 25 kt.
waves 4 to 6 ft occasionally to 8 ft. 
.tuesday...east winds 10 to 20 kt becoming northeast 15 to 25 kt.
waves 4 to 6 ft occasionally to 8 ft.  

$$

fzus63 kmkx 180119
glflm 
expires:202609180915;;630544

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
819 pm cdt thu sep 17 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...

30.4 inch high pressure will shift from the canadian great plains
into ontario tonight, maintaining east-northeast winds across 
lake michigan. 29.9 inch low pressure will develop near the 
missouri river friday afternoon, moving over or just south of 
waters during the day on saturday. winds will veer east- 
southeasterly ahead of the low, becoming gusty at points. a few 
gusts could approach gale thresholds, particularly on friday night
and saturday morning. not expecting any borderline gales to be 
prolonged or widespread enough to warrant gale warnings, but will 
continue to monitor trends. areas of widespread showers & storms 
will accompany the approaching/passing area of low pressure friday
night through at least saturday night, with widespread severe 
weather not expected at this time. 

winds will trend northeasterly sunday through monday night as the 
aforementioned area of low pressure slowly moves into the ohio river 
valley. additional rain showers will accompany the passing low, with 
thunder and severe weather hazards appearing unlikely at this time. 
30.5 inch high pressure will concurrently slide into ontario from
the canadian great plains, with a compacted pressure gradient 
allowing for gusty winds through most of the late weekend/early 
week time frame. similar to saturday, gusts could occasionally 
approach gale thresholds during the sunday-monday night time 
frame, with conditions not expected to be widespread enough for 
gale warnings at this time. winds will steadily taper tuesday 
through wednesday as a new area of 30.3 inch high pressure builds
into northern wisconsin.


lmz080-669-671-673-675-777-779-870-872-874-876-878-180915-
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-
819 pm cdt thu sep 17 2026

sheboygan wi to pentwater mi south...

.rest of tonight...north winds 10 to 20 kt becoming northeast.
isolated showers through early evening. waves 2 to 4 ft. 
.friday...east winds 10 to 20 kt becoming northeast. waves 3 to
5 ft. 
.friday night...east winds 10 to 20 kt increasing to 30 kt.
chance of showers in the evening, then showers overnight. waves
2 to 4 ft building to 5 to 8 ft occasionally to 10 ft. 
.saturday...southeast winds to 30 kt. showers. waves 5 to 8 ft
occasionally to 10 ft. 
.saturday night...east winds 10 to 20 kt becoming northeast.
showers. waves 4 to 7 ft occasionally to 9 ft subsiding to 4 to
6 ft occasionally to 8 ft. 
.sunday...northeast winds 15 to 25 kt increasing to 30 kt. chance
of showers. waves 6 to 9 ft occasionally to 12 ft building to
8 to 11 ft occasionally to 14 ft. 
.sunday night...northeast winds to 30 kt becoming east. chance of
showers. waves 8 to 12 ft occasionally to 16 ft subsiding to 7 to
10 ft occasionally to 13 ft. 
.monday...east winds to 30 kt becoming northeast. chance of
showers. waves 8 to 11 ft occasionally to 14 ft building to 8 to
12 ft occasionally to 16 ft. 
.tuesday...east winds 15 to 25 kt becoming northeast. waves 6 to
9 ft occasionally to 12 ft.  

$$