fzus63 kmkx 220032
glflm 
expires:202604220915;;771847

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
732 pm cdt tue apr 21 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...

a weak surface boundary will continue to work south into the 
southern third of lake michigan tonight, leading to light and 
variable winds with breezier winds further north. the light winds 
could lead to areas of fog over the southern third of the open 
waters through the overnight hours, with trends being monitored for 
possible dense fog advisories through this evening. light north-
northeast winds will become established over all of lake michigan 
after sunrise on wednesday, trending east-southeasterly during the 
second half of the afternoon hours.

southerly winds will increase over the open waters wednesday night 
through friday morning as 29.2 inch low pressure develops over 
the northern great plains. while winds will be breezy, gales are 
not anticipated at this time. the low will pull a cold front 
across lake michigan friday afternoon and evening, resulting in a 
breezy north- northwest wind shift. periods of showers and 
embedded thunderstorms will accompany the approaching/passing 
surface low & front thursday night through friday. severe weather 
is not anticipated at this time.

north to northeast winds will continue through the weekend across 
lake michigan. 29.5 inch low pressure will approach the open 
waters from the great plains during the day on monday, resulting 
in a breezy east wind shift. the low will cross lake michigan 
monday night into tuesday, bringing a northwest wind shift by 
tuesday evening. don't anticipate widespread gale potential as of 
this forecast, though trends will continue to be monitored over 
coming updates. 


lmz261-362-364-366-563-565-567-868-220915-
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-
732 pm cdt tue apr 21 2026

sheboygan wi to pentwater mi north...

.rest of tonight...northeast winds 5 to 10 kt becoming north.
waves 2 to 4 ft subsiding to 1 to 3 ft. 
.wednesday...northeast winds 10 to 15 kt diminishing to 5 to
10 kt. waves 1 to 2 ft. 
.wednesday night...east winds 5 to 10 kt becoming southeast 10 to
15 kt. waves 1 to 2 ft. 
.thursday...southeast winds 10 to 20 kt increasing to 15 to
25 kt. waves 2 to 4 ft. 
.thursday night...southeast winds 15 to 25 kt. waves 4 to 7 ft
occasionally to 9 ft. 
.friday...southeast winds 15 to 25 kt. chance of rain showers in
the morning, then rain showers likely in the afternoon. waves
4 to 7 ft occasionally to 9 ft. 
.friday night...northeast winds 15 to 25 kt becoming north.
chance of rain showers. waves 3 to 5 ft. 
.saturday...north winds 10 to 20 kt becoming northeast. waves
3 to 5 ft. 
.sunday...northeast winds 10 to 15 kt. waves 1 to 3 ft.  

$$

fzus63 kmkx 220032
glflm 
expires:202604220915;;771848

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
732 pm cdt tue apr 21 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...

a weak surface boundary will continue to work south into the 
southern third of lake michigan tonight, leading to light and 
variable winds with breezier winds further north. the light winds 
could lead to areas of fog over the southern third of the open 
waters through the overnight hours, with trends being monitored for 
possible dense fog advisories through this evening. light north-
northeast winds will become established over all of lake michigan 
after sunrise on wednesday, trending east-southeasterly during the 
second half of the afternoon hours.

southerly winds will increase over the open waters wednesday night 
through friday morning as 29.2 inch low pressure develops over 
the northern great plains. while winds will be breezy, gales are 
not anticipated at this time. the low will pull a cold front 
across lake michigan friday afternoon and evening, resulting in a 
breezy north- northwest wind shift. periods of showers and 
embedded thunderstorms will accompany the approaching/passing 
surface low & front thursday night through friday. severe weather 
is not anticipated at this time.

north to northeast winds will continue through the weekend across 
lake michigan. 29.5 inch low pressure will approach the open 
waters from the great plains during the day on monday, resulting 
in a breezy east wind shift. the low will cross lake michigan 
monday night into tuesday, bringing a northwest wind shift by 
tuesday evening. don't anticipate widespread gale potential as of 
this forecast, though trends will continue to be monitored over 
coming updates. 


lmz080-669-671-673-675-777-779-870-872-874-876-878-220915-
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-
732 pm cdt tue apr 21 2026

sheboygan wi to pentwater mi south...

.rest of tonight...south winds 10 to 15 kt backing to north.
patchy fog. waves 2 to 4 ft subsiding to 1 to 3 ft. 
.wednesday...north winds 10 to 15 kt diminishing to 5 to 10 kt.
patchy fog in the morning. waves 1 to 2 ft. 
.wednesday night...northeast winds 5 to 10 kt veering to
southeast. waves 1 to 2 ft. 
.thursday...south winds 10 to 20 kt. waves 1 to 3 ft building to
2 to 4 ft. 
.thursday night...south winds 10 to 20 kt. waves 4 to 7 ft
occasionally to 9 ft. 
.friday...south winds 10 to 20 kt. chance of rain showers in the
morning, then rain showers likely in the afternoon. waves 4 to
7 ft occasionally to 9 ft. 
.friday night...west winds 10 to 20 kt becoming northwest. chance
of rain showers. waves 3 to 5 ft. 
.saturday...north winds 10 to 20 kt. waves 3 to 5 ft. 
.sunday...northeast winds 10 to 15 kt becoming north. waves 3 to
5 ft.  

$$