fzus63 kmkx 150813
glflm 
expires:202608151515;;222276

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
313 am cdt sat aug 15 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...

periods of showers and storms continue over the southern half of
lake michigan today and tonight as a warm front remains stalled 
south over il/in. low pressure around 29.8 inches over ks will 
track to the northeast this morning, then east toward southern 
lake michigan this evening. expect increasing southeasterly winds
and waves across the southern two thirds of lake michigan through
the daytime hours today as the low pressure tracks through the
region then winds diminish tonight as it closes in. a cold front 
will then sweep across the lake overnight into sunday morning, 
with chances for showers and weak storms. expect a northwest 
wind shift behind the cold front into sunday. beyond this system,
a broad ridge of high pressure around 30.1 inches will push into 
the great lakes early next week before another potential system 
moves through the region midweek. 


lmz261-362-364-366-563-565-567-868-151515-
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-
313 am cdt sat aug 15 2026

sheboygan wi to pentwater mi north...

.today...east winds 10 to 20 kt. waves 3 to 5 ft. 
.tonight...east winds 10 to 20 kt veering to southwest 10 to
15 kt. slight chance of showers and thunderstorms overnight.
waves 1 to 3 ft subsiding to 1 to 2 ft. 
.sunday...west winds 10 to 15 kt becoming northwest 10 to 20 kt
late in the morning, then increasing to 15 to 25 kt early in the
afternoon becoming north to 30 kt late. chance of showers in the
morning. waves 1 to 2 ft building to 2 to 4 ft. 
.sunday night...north winds to 30 kt diminishing to 10 to 20 kt
overnight. waves 2 to 4 ft. 
.monday...northwest winds 10 to 15 kt backing to southwest 10 to
20 kt. waves 1 to 3 ft. 
.monday night...southwest winds 10 to 15 kt increasing to 10 to
20 kt. waves 1 to 3 ft. 
.tuesday...southwest winds 15 to 25 kt increasing to 30 kt.
chance of showers. waves 2 to 4 ft. 
.wednesday...north winds 15 to 25 kt increasing to 30 kt. chance
of showers. waves 3 to 5 ft.  

$$

fzus63 kmkx 150813
glflm 
expires:202608151515;;222277

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
313 am cdt sat aug 15 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...

periods of showers and storms continue over the southern half of
lake michigan today and tonight as a warm front remains stalled 
south over il/in. low pressure around 29.8 inches over ks will 
track to the northeast this morning, then east toward southern 
lake michigan this evening. expect increasing southeasterly winds
and waves across the southern two thirds of lake michigan through
the daytime hours today as the low pressure tracks through the
region then winds diminish tonight as it closes in. a cold front 
will then sweep across the lake overnight into sunday morning, 
with chances for showers and weak storms. expect a northwest 
wind shift behind the cold front into sunday. beyond this system,
a broad ridge of high pressure around 30.1 inches will push into 
the great lakes early next week before another potential system 
moves through the region midweek. 


lmz080-669-671-673-675-777-779-870-872-874-876-878-151515-
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-
313 am cdt sat aug 15 2026

sheboygan wi to pentwater mi south...

.today...southeast winds 10 to 20 kt. chance of showers and
thunderstorms this morning, then chance of showers and slight
chance of thunderstorms this afternoon. waves 4 to 6 ft
occasionally to 8 ft. 
.tonight...southeast winds 10 to 15 kt veering to west. slight
chance of showers and thunderstorms overnight. waves 2 to 4 ft
subsiding to 1 to 2 ft. 
.sunday...west winds 10 to 20 kt becoming northwest 10 to 15 kt.
chance of showers in the morning. waves 1 to 2 ft. 
.sunday night...north winds 10 to 20 kt. waves 2 to 4 ft. 
.monday...north winds 10 to 15 kt becoming northwest 10 to 20 kt.
waves 2 to 4 ft. 
.monday night...south winds 10 to 15 kt becoming southwest. waves
1 to 2 ft building to 1 to 3 ft. 
.tuesday...southwest winds 10 to 20 kt. waves 2 to 4 ft. 
.wednesday...west winds 15 to 25 kt becoming north to 30 kt.
chance of showers and thunderstorms. waves 4 to 6 ft occasionally
to 8 ft.  

$$