fzus63 kmkx 181358
glflm 
expires:202608182115;;938265

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
858 am cdt tue aug 18 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...

low pressure around 29.6 inches moving across the hudson bay 
region today will drag a cold front southward across lake michigan  
this afternoon and evening. expect prevailing west to 
southwesterly winds ahead of the cold front along with a few 
thunderstorms through this evening. then the cold front will push 
down the lake by wednesday bringing a north-northwesterly winds 
shift. winds will weaken and become more variable as high pressure
around 30.0 inches tracks through the western great lakes through
thursday. southwesterly winds and thunderstorm chances return 
later friday as another system is progged to bring another cold 
front across the upper great lakes region.


lmz261-362-364-366-563-565-567-868-182115-
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-
858 am cdt tue aug 18 2026

sheboygan wi to pentwater mi north...

.rest of today...west winds 10 to 20 kt becoming southwest 15 to
25 kt. slight chance of showers and thunderstorms through mid
morning, then chance of showers and slight chance of
thunderstorms this afternoon. waves 2 to 4 ft. 
.tonight...west winds 10 to 20 kt becoming northwest 10 to 15 kt.
chance of showers and thunderstorms in the evening. waves 2 to
4 ft subsiding to 1 to 3 ft. 
.wednesday...northwest winds 10 to 15 kt backing to southwest
10 to 20 kt. waves 1 to 2 ft. 
.wednesday night...south winds 10 to 15 kt becoming southeast.
waves 1 to 2 ft. 
.thursday...southwest winds 10 to 15 kt increasing to 10 to
20 kt. waves 1 to 2 ft. 
.thursday night...south winds 10 to 20 kt increasing to 15 to
25 kt. waves 2 to 4 ft. 
.friday...southwest winds to 30 kt. chance of showers. waves 3 to
5 ft. 
.saturday...northwest winds 10 to 20 kt increasing to 30 kt.
waves 1 to 3 ft.  

$$

fzus63 kmkx 181358
glflm 
expires:202608182115;;938266

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
858 am cdt tue aug 18 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...

low pressure around 29.6 inches moving across the hudson bay 
region today will drag a cold front southward across lake michigan  
this afternoon and evening. expect prevailing west to 
southwesterly winds ahead of the cold front along with a few 
thunderstorms through this evening. then the cold front will push 
down the lake by wednesday bringing a north-northwesterly winds 
shift. winds will weaken and become more variable as high pressure
around 30.0 inches tracks through the western great lakes through
thursday. southwesterly winds and thunderstorm chances return 
later friday as another system is progged to bring another cold 
front across the upper great lakes region.


lmz080-669-671-673-675-777-779-870-872-874-876-878-182115-
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-
858 am cdt tue aug 18 2026

sheboygan wi to pentwater mi south...

.rest of today...west winds 10 to 20 kt becoming southwest 15 to
25 kt. chance of showers and thunderstorms this afternoon. waves
2 to 4 ft. 
.tonight...southwest winds 10 to 20 kt veering to north 10 to
15 kt. chance of showers and thunderstorms in the evening, then
slight chance of showers and thunderstorms overnight. waves 3 to
5 ft. 
.wednesday...north winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 3 ft subsiding to 1 to 2 ft. 
.wednesday night...northeast winds 10 to 15 kt becoming southeast
5 to 10 kt. waves 1 to 2 ft. 
.thursday...southeast winds 5 to 10 kt becoming south 10 to 20 kt
in the afternoon. waves 1 to 2 ft. 
.thursday night...south winds 10 to 20 kt. waves 1 to 3 ft. 
.friday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 2 to 4 ft. 
.saturday...northwest winds 10 to 20 kt increasing to 15 to
25 kt. waves 2 to 4 ft.  

$$

fzus63 kmqt 181414
glfls 
expires:202608182000;;939272

open lake forecast for lake superior
national weather service marquette mi 
issued by national weather service gaylord mi 
1015 am edt tue aug 18 2026

for waters beyond 5 nautical miles of shore on lake superior.

waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.synopsis...

a 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow evening 
before expanding to cover much of the great lakes by thursday 
afternoon. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario quickly followed by 30.2 
inch ridging for the latter part of the weekend into next week.




lsz162-182000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1015 am edt tue aug 18 2026 /301 am cdt tue aug 18 2026/

.rest of today...northwest winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. waves building to 1 to 3 feet. 
.tonight...west winds 5 to 15 knots veering northwest late. waves
subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest in the
afternoon. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming north
less than 10 knots after midnight. waves calm to 2 feet. 
.thursday...east winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. a chance of showers. waves calm to
2 feet. 
.thursday night...east winds 5 to 15 knots backing northeast
after midnight. showers likely through midnight. waves calm to
2 feet. 
.friday...north winds 5 to 15 knots backing northwest. waves calm
to 2 feet. 
.saturday...northwest winds 5 to 15 knots veering north. waves
calm to 2 feet. 

$$

fzus63 kmqt 181414
glfls 
expires:202608182000;;939273

open lake forecast for lake superior
national weather service marquette mi 
issued by national weather service gaylord mi 
1015 am edt tue aug 18 2026

for waters beyond 5 nautical miles of shore on lake superior.

waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.synopsis...

a 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow evening 
before expanding to cover much of the great lakes by thursday 
afternoon. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario quickly followed by 30.2 
inch ridging for the latter part of the weekend into next week.




lsz263-182000-
lake superior from saxon harbor wi to upper entrance to portage
canal mi 5nm off shore to the us/canadian border including isle
royale national park-
1015 am edt tue aug 18 2026

.rest of today...northwest winds 10 to 20 knots backing west in the
afternoon, then becoming southwest 15 to 25 knots late. waves
subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.tonight...west winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then veering northwest late. waves subsiding to
calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing west in the
afternoon, then becoming southwest 10 to 20 knots late. waves
calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots diminishing to
less than 10 knots after midnight. waves calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots backing southeast by
mid afternoon. a chance of showers by mid afternoon. waves calm
to 2 feet. 
.thursday night...southeast winds 5 to 15 knots. a chance of
showers. waves calm to 2 feet. 
.friday...north winds 5 to 15 knots backing northwest. waves calm
to 2 feet. 
.saturday...northwest winds 5 to 15 knots veering north. waves
calm to 2 feet. 

$$

fzus63 kmqt 181414
glfls 
expires:202608182000;;939274

open lake forecast for lake superior
national weather service marquette mi 
issued by national weather service gaylord mi 
1015 am edt tue aug 18 2026

for waters beyond 5 nautical miles of shore on lake superior.

waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.synopsis...

a 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow evening 
before expanding to cover much of the great lakes by thursday 
afternoon. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario quickly followed by 30.2 
inch ridging for the latter part of the weekend into next week.




lsz264-182000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1015 am edt tue aug 18 2026

.rest of today...northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon, then becoming southwest 10 to 20 knots
late. waves subsiding to calm to 2 feet, then building to 1 to
3 feet. 
.tonight...west winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then veering northwest late. waves subsiding to
calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing southwest
late. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming south
less than 10 knots after midnight. waves calm to 2 feet. 
.thursday...southeast winds less than 10 knots becoming south
5 to 15 knots by mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots. a chance of
showers. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots backing north. waves calm to
2 feet. 
.saturday...northwest winds 5 to 15 knots veering north. waves
calm to 2 feet. 

$$

fzus63 kmqt 181414
glfls 
expires:202608182000;;939275

open lake forecast for lake superior
national weather service marquette mi 
issued by national weather service gaylord mi 
1015 am edt tue aug 18 2026

for waters beyond 5 nautical miles of shore on lake superior.

waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.synopsis...

a 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow evening 
before expanding to cover much of the great lakes by thursday 
afternoon. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario quickly followed by 30.2 
inch ridging for the latter part of the weekend into next week.




lsz265-182000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1015 am edt tue aug 18 2026

.rest of today...west winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon, then backing west late. waves building
to 2 to 4 feet, then subsiding to calm to 2 feet. 
.tonight...west winds 15 to 25 knots. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots veering northwest in the
afternoon, then becoming north 5 to 15 knots late. waves calm to
2 feet. 
.wednesday night...south winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. waves calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots backing southeast by
mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 10 to 20 knots veering south
after midnight. a chance of showers. waves calm to 2 feet. 
.friday...northeast winds 10 to 20 knots backing northwest. a
chance of showers. waves calm to 2 feet. 
.saturday...northwest winds 15 to 25 knots. waves building to
2 to 4 feet, then subsiding to 1 to 3 feet. 

$$

fzus63 kmqt 181414
glfls 
expires:202608182000;;939276

open lake forecast for lake superior
national weather service marquette mi 
issued by national weather service gaylord mi 
1015 am edt tue aug 18 2026

for waters beyond 5 nautical miles of shore on lake superior.

waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.synopsis...

a 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow evening 
before expanding to cover much of the great lakes by thursday 
afternoon. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario quickly followed by 30.2 
inch ridging for the latter part of the weekend into next week.




lsz266-182000-
lake superior east of a line from manitou island to marquette mi
and west of a line from grand marais mi to the us/canadian border
beyond 5nm from shore-
1015 am edt tue aug 18 2026

.rest of today...west winds 15 to 25 knots veering northwest in the
afternoon, then becoming west 10 to 20 knots late. a slight
chance of showers through early afternoon. waves building to 2 to
4 feet, then subsiding to calm to 2 feet. 
.tonight...west winds 10 to 20 knots veering northwest late.
waves building to 1 to 3 feet, then subsiding to calm to 2 feet. 
.wednesday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then veering north late. waves calm to
2 feet. 
.wednesday night...south winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...southwest winds 5 to 15 knots backing southeast by
mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. a chance of showers. waves calm to
2 feet. 
.friday...southeast winds 10 to 20 knots backing north. a chance
of showers. waves building to 1 to 3 feet. 
.saturday...northwest winds 15 to 25 knots veering north. waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet. 

$$

fzus63 kmqt 181414
glfls 
expires:202608182000;;939277

open lake forecast for lake superior
national weather service marquette mi 
issued by national weather service gaylord mi 
1015 am edt tue aug 18 2026

for waters beyond 5 nautical miles of shore on lake superior.

waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.synopsis...

a 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow evening 
before expanding to cover much of the great lakes by thursday 
afternoon. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario quickly followed by 30.2 
inch ridging for the latter part of the weekend into next week.




lsz267-182000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1015 am edt tue aug 18 2026

.rest of today...west winds 10 to 20 knots. a slight chance of showers
and thunderstorms through early afternoon. waves 1 to 3 feet. 
.tonight...west winds 10 to 20 knots. waves subsiding to calm to
2 feet. 
.wednesday...northwest winds 10 to 20 knots backing west in the
afternoon, then becoming northwest 5 to 15 knots late. waves calm
to 2 feet. 
.wednesday night...west winds 5 to 15 knots backing south after
midnight. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots veering northwest by mid
afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. a chance of showers. waves calm to
2 feet. 
.friday...southeast winds 10 to 20 knots backing east. showers
likely, then a chance of showers. waves calm to 2 feet. 
.saturday...northwest winds 10 to 20 knots becoming north 15 to
25 knots. waves building to 2 to 4 feet. 

$$