fzus63 kdtx 180736
glflh 
expires:202509181545;;178875

open lake forecast for lake huron
national weather service detroit/pontiac mi
336 am edt thu sep 18 2025

for waters beyond five nautical miles off shore on lake huron

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...high pressure, 30.00 inches, over the central and
eastern great lakes will gradually weaken into thursday. a
stronger high developing over northern ontario forces a weak cold
front across the region thursday. the high pressure then
gradually shifts southeast across ontario before reaching
southern quebec on saturday and new england on sunday.


lhz361-181545-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
336 am edt thu sep 18 2025

.today...northwest winds 5 to 10 knots until late afternoon
becoming light and variable. waves 2 feet or less. 
.tonight...light and variable winds becoming northeast 5 to
10 knots late in the evening...then increasing to 10 to 15 knots
after midnight. waves 2 feet or less. 
.friday...northeast winds 10 to 15 knots becoming east 5 to
10 knots in the late morning and afternoon. waves 1 to 3 feet. 
.friday night...east winds 5 to 10 knots increasing to 15 to
20 knots after midnight. waves 1 to 3 feet. 
.saturday...east winds 15 to 20 knots with gusts to around
30 knots becoming southeast 10 to 15 knots late in the evening. a
chance of showers late in the evening. waves 3 to 5 feet. 
.sunday...southeast winds 10 to 15 knots decreasing to 5 to
10 knots until early morning. a chance of showers early in the
morning...then showers likely until early morning. waves 2 to
4 feet subsiding to 1 to 3 feet in the late evening and early
morning. 
.monday...south winds 5 to 10 knots until afternoon becoming
light and variable. a chance of showers. a chance of
thunderstorms in the late morning and early afternoon. waves 1 to
3 feet. 


$$

fzus63 kdtx 180736
glflh 
expires:202509181545;;178876

open lake forecast for lake huron
national weather service detroit/pontiac mi
336 am edt thu sep 18 2025

for waters beyond five nautical miles off shore on lake huron

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...high pressure, 30.00 inches, over the central and
eastern great lakes will gradually weaken into thursday. a
stronger high developing over northern ontario forces a weak cold
front across the region thursday. the high pressure then
gradually shifts southeast across ontario before reaching
southern quebec on saturday and new england on sunday.


lhz362-363-181545-
lake huron from presque isle light to sturgeon point mi beyond
5nm off shore-
lake huron from sturgeon point to alabaster mi beyond 5nm off
shore-
336 am edt thu sep 18 2025

.today...northwest winds 5 to 10 knots. waves 1 to 3 feet. 
.tonight...north winds 5 to 10 knots becoming northeast 10 to
15 knots after midnight. waves 1 to 3 feet. 
.friday...northeast winds 10 to 15 knots. waves 2 to 4 feet. 
.friday night...northeast winds 5 to 10 knots becoming east 15 to
20 knots. waves 2 to 4 feet. 
.saturday...east winds 15 to 20 knots decreasing to 10 to
15 knots. waves 3 to 5 feet. 
.sunday...southeast winds 10 to 15 knots. a chance of showers in
the late morning and early afternoon. rain showers likely until
early morning. waves 2 to 4 feet. 
.monday...south winds 10 to 15 knots decreasing to 5 to 10 knots
until early morning. showers likely early in the morning...then a
chance of showers. waves 2 to 4 feet subsiding to 1 to 3 feet
until early morning. 


$$

fzus63 kdtx 180736
glflh 
expires:202509181545;;178877

open lake forecast for lake huron
national weather service detroit/pontiac mi
336 am edt thu sep 18 2025

for waters beyond five nautical miles off shore on lake huron

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...high pressure, 30.00 inches, over the central and
eastern great lakes will gradually weaken into thursday. a
stronger high developing over northern ontario forces a weak cold
front across the region thursday. the high pressure then
gradually shifts southeast across ontario before reaching
southern quebec on saturday and new england on sunday.


lhz462>464-181545-
lake huron from port austin to harbor beach beyond 5nm off shore-
lake huron from harbor beach to port sanilac beyond 5nm off shore-
lake huron from port sanilac to port huron beyond 5nm off shore-
336 am edt thu sep 18 2025

.today...west winds 5 to 10 knots veering to the north early in
the afternoon...then increasing to 10 to 15 knots late in the
afternoon. waves 2 feet or less. 
.tonight...northeast winds 10 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet in the late evening and overnight. 
.friday...northeast winds 10 to 15 knots. waves 2 to 4 feet. 
.friday night...northeast winds 15 to 20 knots becoming east
10 to 15 knots after midnight. waves 2 to 4 feet. 
.saturday...east winds 10 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet late in the afternoon...then building to
2 to 4 feet late in the evening. 
.sunday...southeast winds 10 to 15 knots veering to the south in
the late evening and early morning. a chance of showers early in
the evening. rain showers likely in the late evening and early
morning. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.monday...south winds 10 to 15 knots decreasing to 5 to 10 knots
until early morning. showers likely...then a chance of showers in
the late evening and early morning. waves 1 to 3 feet. 


$$

fzus63 kmkx 180748
glflm 
expires:202509181530;;179346

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
248 am cdt thu sep 18 2025

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...

winds remain light and variable over the southern half of the lake,
with a light northeast wind developing over the northern half of 
the lake in response to a weak backdoor cold front through this 
morning. this front sags southward across the rest of the lake by
this afternoon, bringing steady north winds. 

light to moderate northeast winds are then expected into friday, 
becoming breezy and veering southeast friday night through 
saturday morning as the high pressure strengthens to around 30.4 
inches and approaches southern ontario and quebec and as low 
pressure around 29.9 inches moves into the dakotas and minnesota. 
on and off thunderstorms are expected friday night through sunday.


lmz261-362-364-366-563-565-567-868-181530-
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-
248 am cdt thu sep 18 2025

sheboygan wi to pentwater mi north...

.today...northeast winds 5 to 10 kt becoming north. patchy fog
this morning. slight chance of showers this morning, then slight
chance of showers and thunderstorms this afternoon. waves 1 to
2 ft. 
.tonight...northeast winds 10 to 15 kt becoming east. slight
chance of showers in the evening. waves 1 to 3 ft. 
.friday...east winds 10 to 15 kt becoming northeast 10 to 20 kt.
waves 1 to 3 ft. 
.friday night...east winds 15 to 25 kt becoming southeast. waves
2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.saturday...southeast winds 10 to 20 kt increasing to 15 to
25 kt. chance of showers. waves 4 to 6 ft occasionally to 8 ft. 
.saturday night...southeast winds 10 to 20 kt. chance of showers.
waves 2 to 4 ft. 
.sunday...south winds 10 to 20 kt. chance of showers. waves 2 to
4 ft. 
.monday...southwest winds 10 to 15 kt increasing to 10 to 20 kt.
chance of showers. waves 1 to 3 ft.  

$$

fzus63 kmkx 180748
glflm 
expires:202509181530;;179347

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
248 am cdt thu sep 18 2025

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...

winds remain light and variable over the southern half of the lake,
with a light northeast wind developing over the northern half of 
the lake in response to a weak backdoor cold front through this 
morning. this front sags southward across the rest of the lake by
this afternoon, bringing steady north winds. 

light to moderate northeast winds are then expected into friday, 
becoming breezy and veering southeast friday night through 
saturday morning as the high pressure strengthens to around 30.4 
inches and approaches southern ontario and quebec and as low 
pressure around 29.9 inches moves into the dakotas and minnesota. 
on and off thunderstorms are expected friday night through sunday.


lmz080-669-671-673-675-777-779-870-872-874-876-878-181530-
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-
248 am cdt thu sep 18 2025

sheboygan wi to pentwater mi south...

.today...south winds less than 10 kt becoming southwest late this
morning, then becoming north early this afternoon increasing to
10 to 15 kt late. waves 1 to 2 ft. 
.tonight...northeast winds 10 to 15 kt becoming east. waves 1 to
3 ft. 
.friday...east winds 10 to 15 kt becoming northeast. waves 1 to
3 ft. 
.friday night...east winds 10 to 20 kt becoming southeast 15 to
25 kt. waves 2 to 4 ft building to 4 to 6 ft occasionally to
8 ft. 
.saturday...southeast winds 10 to 20 kt. chance of showers in the
afternoon. waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to
5 ft. 
.saturday night...southeast winds 10 to 15 kt increasing to 10 to
20 kt. chance of showers. waves 2 to 4 ft. 
.sunday...south winds 10 to 20 kt. chance of showers. waves 2 to
4 ft. 
.monday...southwest winds 10 to 20 kt becoming south. chance of
showers. waves 1 to 3 ft.  

$$

fzus63 kmqt 180801
glfls 
expires:202509182000;;179683

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 18 2025

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 30.3 inch high over manitoba shifts over northern ontario through 
friday and strengthens to 30.4 inches on saturday over eastern 
ontario and western quebec. the 30.4 inch high will move to new 
england by sunday morning. this brings 30.2 inch ridging back over 
lake superior late today and friday, weakening to 30.1 inches by the 
end of the day saturday. troughing then begins to spread over lake 
superior sunday into the beginning of next week as low pressure 
deepens over the canadian prairie to around 29.5 inches.



lsz162-182000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt thu sep 18 2025 /301 am cdt thu sep 18 2025/

.early this morning...northeast winds 15 to 25 knots. waves 1 to
3 feet. 
.today...northeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then becoming east 15 to 25 knots
late. a slight chance of showers. waves building to 3 to 6 feet
occasionally to 8 feet. 
.tonight...east winds 15 to 25 knots. a slight chance of showers
and thunderstorms. waves subsiding to 3 to 5 feet occasionally to
7 feet. 
.friday...east winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. a slight chance of thunderstorms through early
afternoon. a chance of showers. waves building to 5 to 8 feet
occasionally to 10 feet. 
.friday night...east winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. a chance of showers and a slight chance
of thunderstorms. waves subsiding to 2 to 4 feet. 
.saturday...east winds 10 to 20 knots. showers likely. waves
subsiding to calm to 2 feet. 
.saturday night...southeast winds 5 to 15 knots veering south
after midnight. showers likely through midnight. a chance of
thunderstorms. a chance of showers after midnight. waves calm to
2 feet. 
.sunday...south winds 5 to 15 knots backing northeast. a chance
of showers. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots backing north. waves calm to
2 feet. 

$$

fzus63 kmqt 180801
glfls 
expires:202509182000;;179684

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 18 2025

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 30.3 inch high over manitoba shifts over northern ontario through 
friday and strengthens to 30.4 inches on saturday over eastern 
ontario and western quebec. the 30.4 inch high will move to new 
england by sunday morning. this brings 30.2 inch ridging back over 
lake superior late today and friday, weakening to 30.1 inches by the 
end of the day saturday. troughing then begins to spread over lake 
superior sunday into the beginning of next week as low pressure 
deepens over the canadian prairie to around 29.5 inches.



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-
401 am edt thu sep 18 2025

.early this morning...northeast winds 10 to 20 knots. waves 1 to
3 feet. 
.today...northeast winds 10 to 20 knots increasing to 15 to
25 knots late. a slight chance of showers. waves building to 3 to
6 feet occasionally to 8 feet. 
.tonight...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. a slight chance of showers and
thunderstorms. waves subsiding to 2 to 4 feet. 
.friday...east winds 15 to 25 knots. a slight chance of showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.friday night...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. a chance of showers and a slight chance
of thunderstorms. waves subsiding to 2 to 4 feet. 
.saturday...southeast winds 10 to 20 knots. showers likely. waves
building to 3 to 5 feet occasionally to 7 feet. 
.saturday night...southeast winds 5 to 15 knots veering south
after midnight. showers likely through midnight. a chance of
showers after midnight. waves subsiding to 1 to 3 feet. 
.sunday...south winds 5 to 15 knots. a chance of showers. waves
subsiding to calm to 2 feet. 
.monday...southwest winds 5 to 15 knots veering north. waves calm
to 2 feet. 

$$

fzus63 kmqt 180801
glfls 
expires:202509182000;;179685

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 18 2025

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 30.3 inch high over manitoba shifts over northern ontario through 
friday and strengthens to 30.4 inches on saturday over eastern 
ontario and western quebec. the 30.4 inch high will move to new 
england by sunday morning. this brings 30.2 inch ridging back over 
lake superior late today and friday, weakening to 30.1 inches by the 
end of the day saturday. troughing then begins to spread over lake 
superior sunday into the beginning of next week as low pressure 
deepens over the canadian prairie to around 29.5 inches.



lsz264-182000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 am edt thu sep 18 2025

.early this morning...northeast winds 10 to 20 knots. waves 1 to
3 feet. 
.today...northeast winds 10 to 20 knots. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.tonight...northeast winds 5 to 15 knots becoming east 10 to
20 knots after midnight. waves subsiding to calm to 2 feet, then
building to 2 to 4 feet. 
.friday...east winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. waves 2 to 4 feet. 
.friday night...east winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. a slight chance of showers after
midnight. waves building to 3 to 5 feet occasionally to 7 feet. 
.saturday...southeast winds 15 to 25 knots. a chance of showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.saturday night...southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. a chance of showers. waves
subsiding to 2 to 4 feet. 
.sunday...south winds 5 to 15 knots. a chance of showers. waves
subsiding to calm to 2 feet. 
.monday...south winds 5 to 15 knots veering southwest. waves calm
to 2 feet. 

$$

fzus63 kmqt 180801
glfls 
expires:202509182000;;179686

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 18 2025

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 30.3 inch high over manitoba shifts over northern ontario through 
friday and strengthens to 30.4 inches on saturday over eastern 
ontario and western quebec. the 30.4 inch high will move to new 
england by sunday morning. this brings 30.2 inch ridging back over 
lake superior late today and friday, weakening to 30.1 inches by the 
end of the day saturday. troughing then begins to spread over lake 
superior sunday into the beginning of next week as low pressure 
deepens over the canadian prairie to around 29.5 inches.



lsz265-182000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 am edt thu sep 18 2025

.early this morning...northeast winds 10 to 20 knots. waves calm
to 2 feet building to 1 to 3 feet. 
.today...northeast winds 10 to 20 knots. waves subsiding to calm
to 2 feet. 
.tonight...northeast winds 10 to 20 knots veering east after
midnight. waves building to 1 to 3 feet. 
.friday...east winds 15 to 25 knots. waves building to 2 to
4 feet. 
.friday night...east winds 15 to 25 knots veering southeast after
midnight. a slight chance of showers after midnight. waves 2 to
4 feet. 
.saturday...southeast winds 15 to 25 knots. a chance of showers.
waves subsiding to 1 to 3 feet. 
.saturday night...southeast winds 10 to 20 knots veering south
after midnight. a chance of showers through midnight. showers
likely after midnight. waves subsiding to calm to 2 feet. 
.sunday...south winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of showers. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 180801
glfls 
expires:202509182000;;179687

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 18 2025

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 30.3 inch high over manitoba shifts over northern ontario through 
friday and strengthens to 30.4 inches on saturday over eastern 
ontario and western quebec. the 30.4 inch high will move to new 
england by sunday morning. this brings 30.2 inch ridging back over 
lake superior late today and friday, weakening to 30.1 inches by the 
end of the day saturday. troughing then begins to spread over lake 
superior sunday into the beginning of next week as low pressure 
deepens over the canadian prairie to around 29.5 inches.



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-
401 am edt thu sep 18 2025

.early this morning...northeast winds 10 to 20 knots. waves 1 to
3 feet. 
.today...northeast winds 10 to 20 knots. waves 1 to 3 feet. 
.tonight...northeast winds 10 to 20 knots veering east after
midnight. waves building to 2 to 4 feet. 
.friday...east winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. waves subsiding to 1 to 3 feet. 
.friday night...east winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. a slight chance of showers after
midnight. waves building to 3 to 5 feet occasionally to 7 feet. 
.saturday...southeast winds 15 to 25 knots. a chance of showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.saturday night...southeast winds 10 to 20 knots veering south
after midnight. a chance of showers through midnight. showers
likely after midnight. waves subsiding to 2 to 4 feet. 
.sunday...south winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of showers. waves subsiding to calm to 2 feet.
.monday...south winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 

$$

fzus63 kmqt 180801
glfls 
expires:202509182000;;179688

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 18 2025

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 30.3 inch high over manitoba shifts over northern ontario through 
friday and strengthens to 30.4 inches on saturday over eastern 
ontario and western quebec. the 30.4 inch high will move to new 
england by sunday morning. this brings 30.2 inch ridging back over 
lake superior late today and friday, weakening to 30.1 inches by the 
end of the day saturday. troughing then begins to spread over lake 
superior sunday into the beginning of next week as low pressure 
deepens over the canadian prairie to around 29.5 inches.



lsz267-182000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 am edt thu sep 18 2025

.early this morning...north winds 10 to 20 knots. waves calm to
2 feet. 
.today...north winds 10 to 20 knots. waves building to 1 to
3 feet, then subsiding to calm to 2 feet. 
.tonight...northeast winds 10 to 20 knots veering east after
midnight. waves building to 1 to 3 feet. 
.friday...east winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then backing northeast late. waves subsiding to
calm to 2 feet. 
.friday night...east winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.saturday...southeast winds 15 to 25 knots. waves 2 to 4 feet. 
.saturday night...southeast winds 15 to 25 knots. a chance of
showers through midnight. showers likely after midnight. waves
2 to 4 feet. 
.sunday...southeast winds 10 to 20 knots veering south. showers
likely and a chance of thunderstorms. waves subsiding to calm to
2 feet. 
.monday...south winds 10 to 20 knots. a chance of showers. waves
calm to 2 feet. 

$$