fzus63 kmkx 221408
glflm 
expires:202608222115;;169063

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
908 am cdt sat aug 22 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...

29.8 inch low pressure is centered over the southern hudson bay 
this morning, resulting in generally northeast winds across the 
open waters of lake michigan. these winds will continue into this 
evening as a weak cold front moves across the lake and 30.2 inch 
high pressure builds into the northern great plains. isolated 
showers and thunderstorms are possible along the passing front 
this afternoon & evening. severe weather potential is low in this 
activity, though an isolated stronger storm with gusty winds or a 
waterspout can't be entirely ruled out. will be watching radar 
trends for any potential marine weather statements or special 
marine warnings through this evening. northwest winds will 
continue through the day sunday, ultimately weakening by sunday 
night as the aforementioned area of high pressure approaches lake 
michigan. 

light and variable winds will continue monday 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 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 into the beginning of next week. 


lmz261-362-364-366-563-565-567-868-222115-
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-
908 am cdt sat aug 22 2026

sheboygan wi to pentwater mi north...

.rest of today...northwest winds 10 to 20 kt increasing to 15 to
25 kt. slight chance of showers and thunderstorms this afternoon.
waves 2 to 4 ft. 
.tonight...north winds to 30 kt diminishing to 15 to 25 kt.
slight chance of showers and thunderstorms in the evening. waves
4 to 6 ft occasionally to 8 ft. 
.sunday...northwest winds 15 to 25 kt becoming north to 30 kt.
waves 4 to 7 ft occasionally to 9 ft. 
.sunday night...north winds to 30 kt becoming northwest 15 to
25 kt. waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to
5 ft. 
.monday...northwest winds 15 to 25 kt becoming north. waves 2 to
4 ft. 
.monday night...west winds 10 to 20 kt becoming southwest 5 to
10 kt. waves 1 to 3 ft subsiding to 1 to 2 ft. 
.tuesday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 2 ft building to 2 to 4 ft. 
.wednesday...southwest winds 15 to 25 kt increasing to 30 kt.
chance of showers. waves 3 to 5 ft.  

$$

fzus63 kmkx 221408
glflm 
expires:202608222115;;169064

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
908 am cdt sat aug 22 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...

29.8 inch low pressure is centered over the southern hudson bay 
this morning, resulting in generally northeast winds across the 
open waters of lake michigan. these winds will continue into this 
evening as a weak cold front moves across the lake and 30.2 inch 
high pressure builds into the northern great plains. isolated 
showers and thunderstorms are possible along the passing front 
this afternoon & evening. severe weather potential is low in this 
activity, though an isolated stronger storm with gusty winds or a 
waterspout can't be entirely ruled out. will be watching radar 
trends for any potential marine weather statements or special 
marine warnings through this evening. northwest winds will 
continue through the day sunday, ultimately weakening by sunday 
night as the aforementioned area of high pressure approaches lake 
michigan. 

light and variable winds will continue monday 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 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 into the beginning of next week. 


lmz080-669-671-673-675-777-779-870-872-874-876-878-222115-
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-
908 am cdt sat aug 22 2026

sheboygan wi to pentwater mi south...

.rest of today...northwest winds 10 to 20 kt. waves 4 to 6 ft
occasionally to 8 ft. 
.tonight...north winds 15 to 25 kt diminishing to 10 to 20 kt.
slight chance of showers and thunderstorms in the evening, then
slight chance of showers overnight. waves 4 to 6 ft occasionally
to 8 ft. 
.sunday...northwest winds 15 to 25 kt becoming north to 30 kt.
waves 4 to 7 ft occasionally to 9 ft. 
.sunday night...north winds 15 to 25 kt diminishing to 10 to
20 kt. waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft. 
.monday...northwest winds 10 to 20 kt becoming north. waves 2 to
4 ft. 
.monday night...east winds 10 to 15 kt veering to south. waves
1 to 3 ft. 
.tuesday...south winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 2 ft building to 1 to 3 ft. 
.wednesday...southwest winds 15 to 25 kt increasing to 30 kt.
chance of showers. waves 3 to 5 ft.  

$$