fzus63 kmkx 231343
glflm 
expires:202608232115;;226130

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
843 am cdt sun aug 23 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...

scattered shower chances continue over the northern third of lake 
michigan today, with a few waterspouts possible. 29.7 inch low 
pressure is centered near the ontario-quebec border, resulting in 
breezy northwest winds across the open waters of lake michigan. 
the breezy winds will continue through tonight as the low lingers 
in the same general vicinity. expecting most gusts to remain in 
the 25-30 knot range, though a few gusts approaching gale force 
are possible over the northern third of the lake. given the brief 
& isolated nature of any such gusts, not anticipating the need for
any gale headlines, but will be monitoring trends. 30.1 inch high
pressure will steadily build into the upper mississippi valley 
today, reaching the waters by monday afternoon. the high's arrival
will lead to decreasing winds, with conditions becoming light and
variable by monday evening. 

light and variable winds will continue monday night with high 
pressure lingering in the vicinity. the high will shift east into 
ontario by tuesday, resulting in a south-southwest wind shift across 
the waters. 29.7 inch low pressure will approach from the 
northern great plains tuesday night into wednesday, reinforcing 
the south-southwesterly wind pattern. the low will cross lake 
michigan during the second half of the day wednesday, bringing a 
breezy northwest wind shift. gales are not expected as this 
occurs. showers and thunderstorms will accompany the 
approaching/passing surface low tuesday night into wednesday 
afternoon. it remains too early to tell if any of these storms 
could be severe, with trends being monitored through the beginning
of this week. the next area of 30.1 inch high pressure will 
gradually build toward lake michigan from the northern great 
plains wednesday night through friday, bringing slowly decreasing 
winds. 


lmz261-362-364-366-563-565-567-868-232115-
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-
843 am cdt sun aug 23 2026

sheboygan wi to pentwater mi north...

.rest of today...northwest winds to 30 kt becoming north. slight
chance of showers through mid morning. waves 4 to 7 ft
occasionally to 9 ft. 
.tonight...north winds to 30 kt becoming northwest. waves 4 to
7 ft occasionally to 9 ft. 
.monday...northwest winds 15 to 25 kt. waves 4 to 6 ft
occasionally to 8 ft subsiding to 2 to 4 ft. 
.monday night...northwest winds 10 to 20 kt diminishing to 5 to
10 kt overnight. waves 2 to 4 ft subsiding to 1 to 2 ft. 
.tuesday...southwest winds 10 to 15 kt increasing to 15 to 25 kt
in the afternoon. waves 1 to 2 ft building to 2 to 4 ft. 
.tuesday night...south winds 15 to 25 kt diminishing to 10 to
20 kt. chance of showers. waves 3 to 5 ft. 
.wednesday...southwest winds 15 to 25 kt becoming south to 30 kt.
showers likely with a chance of thunderstorms. waves 4 to 6 ft
occasionally to 8 ft. 
.thursday...northwest winds 10 to 20 kt increasing to 30 kt.
waves 1 to 3 ft.  

$$

fzus63 kmkx 231343
glflm 
expires:202608232115;;226131

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
843 am cdt sun aug 23 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...

scattered shower chances continue over the northern third of lake 
michigan today, with a few waterspouts possible. 29.7 inch low 
pressure is centered near the ontario-quebec border, resulting in 
breezy northwest winds across the open waters of lake michigan. 
the breezy winds will continue through tonight as the low lingers 
in the same general vicinity. expecting most gusts to remain in 
the 25-30 knot range, though a few gusts approaching gale force 
are possible over the northern third of the lake. given the brief 
& isolated nature of any such gusts, not anticipating the need for
any gale headlines, but will be monitoring trends. 30.1 inch high
pressure will steadily build into the upper mississippi valley 
today, reaching the waters by monday afternoon. the high's arrival
will lead to decreasing winds, with conditions becoming light and
variable by monday evening. 

light and variable winds will continue monday night with high 
pressure lingering in the vicinity. the high will shift east into 
ontario by tuesday, resulting in a south-southwest wind shift across 
the waters. 29.7 inch low pressure will approach from the 
northern great plains tuesday night into wednesday, reinforcing 
the south-southwesterly wind pattern. the low will cross lake 
michigan during the second half of the day wednesday, bringing a 
breezy northwest wind shift. gales are not expected as this 
occurs. showers and thunderstorms will accompany the 
approaching/passing surface low tuesday night into wednesday 
afternoon. it remains too early to tell if any of these storms 
could be severe, with trends being monitored through the beginning
of this week. the next area of 30.1 inch high pressure will 
gradually build toward lake michigan from the northern great 
plains wednesday night through friday, bringing slowly decreasing 
winds. 


lmz080-669-671-673-675-777-779-870-872-874-876-878-232115-
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-
843 am cdt sun aug 23 2026

sheboygan wi to pentwater mi south...

.rest of today...northwest winds to 30 kt becoming north. waves
5 to 8 ft occasionally to 10 ft. 
.tonight...north winds 15 to 25 kt diminishing to 10 to 20 kt.
waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft. 
.monday...northwest winds 10 to 20 kt becoming north. waves 2 to
4 ft. 
.monday night...northeast winds 10 to 15 kt backing to southwest.
waves 1 to 3 ft subsiding to 1 to 2 ft. 
.tuesday...southwest winds 10 to 15 kt becoming south 10 to
20 kt. waves 1 to 2 ft building to 2 to 4 ft. 
.tuesday night...south winds 15 to 25 kt becoming southwest 10 to
20 kt. waves 3 to 5 ft. 
.wednesday...southwest winds 15 to 25 kt increasing to 30 kt.
chance of showers and thunderstorms. waves 4 to 6 ft occasionally
to 8 ft. 
.thursday...northwest winds 10 to 20 kt becoming north. waves
2 to 4 ft.  

$$