fzus63 kdtx 170728
glflh 
expires:202609171530;;589065

open lake forecast for lake huron
national weather service detroit/pontiac mi
328 am edt thu sep 17 2026

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...southern edge of northern ontario high pressure, 30.30
inches, slides across the central great lakes through thursday. a
secondary cold front passes southward through the region thursday
night into early friday before plains low pressure arrives this
weekend.


lhz462>464-171530-
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-
328 am edt thu sep 17 2026

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


$$

fzus63 kdtx 170728
glflh 
expires:202609171530;;589064

open lake forecast for lake huron
national weather service detroit/pontiac mi
328 am edt thu sep 17 2026

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...southern edge of northern ontario high pressure, 30.30
inches, slides across the central great lakes through thursday. a
secondary cold front passes southward through the region thursday
night into early friday before plains low pressure arrives this
weekend.


lhz362-363-171530-
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-
328 am edt thu sep 17 2026

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


$$

fzus63 kdtx 170728
glflh 
expires:202609171530;;589063

open lake forecast for lake huron
national weather service detroit/pontiac mi
328 am edt thu sep 17 2026

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...southern edge of northern ontario high pressure, 30.30
inches, slides across the central great lakes through thursday. a
secondary cold front passes southward through the region thursday
night into early friday before plains low pressure arrives this
weekend.


lhz361-171530-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
328 am edt thu sep 17 2026

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


$$

fzus63 kmkx 170813
glflm 
expires:202609171515;;591138

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
313 am cdt thu sep 17 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...

30.4 inch high pressure will continue east through the day into
quebec. progression of the high will maintain east-northeast 
winds across the open waters through the afternoon. occasional 
periods of showers and thunderstorms will continue across the
lake, but no severe weather is expected.

a second area of 30.4 inch high pressure will shift from the 
canadian great plains into ontario tonight into friday morning, 
maintaining east-northeast winds across lake michigan. 29.9 inch 
low pressure will develop near the missouri river friday 
afternoon, moving over or just south of waters during the day on 
saturday. winds will veer east-southeasterly and increase as the 
low approaches. some gusts could approach gale thresholds, 
particularly friday night into saturday morning. whether 
borderline gales will be widespread enough to warrant gale 
warnings remains uncertain at this time. widespread showers and
storms will accompany the approaching/passing area of low pressure
friday night through at least saturday night, with widespread 
severe weather not expected. winds will shift northeasterly as 
the low slowly moves into the ohio river valley sunday into the 
beginning of next week.


lmz261-362-364-366-563-565-567-868-171515-
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 thu sep 17 2026

sheboygan wi to pentwater mi north...

.today...east winds 5 to 10 kt backing to northwest early this
afternoon, then increasing to 10 to 20 kt late. slight chance of
showers this morning. waves 1 to 2 ft. 
.tonight...north winds 10 to 20 kt becoming northeast 10 to
15 kt. waves 1 to 3 ft. 
.friday...northeast winds 10 to 15 kt becoming east. waves 1 to
3 ft. 
.friday night...east winds 15 to 25 kt becoming southeast to
30 kt. chance of showers. waves 3 to 5 ft building to 6 to 9 ft
occasionally to 12 ft. 
.saturday...southeast winds to 30 kt becoming east. showers in
the morning, then chance of showers in the afternoon. waves 8 to
11 ft occasionally to 14 ft. 
.saturday night...east winds 15 to 25 kt becoming northeast.
chance of showers. waves 5 to 8 ft occasionally to 10 ft
subsiding to 4 to 6 ft occasionally to 8 ft. 
.sunday...northeast winds to 30 kt. waves 5 to 8 ft occasionally
to 10 ft. 
.monday...east winds 15 to 25 kt. waves 4 to 6 ft occasionally to
8 ft.  

$$

fzus63 kmkx 170813
glflm 
expires:202609171515;;591139

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
313 am cdt thu sep 17 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...

30.4 inch high pressure will continue east through the day into
quebec. progression of the high will maintain east-northeast 
winds across the open waters through the afternoon. occasional 
periods of showers and thunderstorms will continue across the
lake, but no severe weather is expected.

a second area of 30.4 inch high pressure will shift from the 
canadian great plains into ontario tonight into friday morning, 
maintaining east-northeast winds across lake michigan. 29.9 inch 
low pressure will develop near the missouri river friday 
afternoon, moving over or just south of waters during the day on 
saturday. winds will veer east-southeasterly and increase as the 
low approaches. some gusts could approach gale thresholds, 
particularly friday night into saturday morning. whether 
borderline gales will be widespread enough to warrant gale 
warnings remains uncertain at this time. widespread showers and
storms will accompany the approaching/passing area of low pressure
friday night through at least saturday night, with widespread 
severe weather not expected. winds will shift northeasterly as 
the low slowly moves into the ohio river valley sunday into the 
beginning of next week.


lmz080-669-671-673-675-777-779-870-872-874-876-878-171515-
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 thu sep 17 2026

sheboygan wi to pentwater mi south...

.today...northeast winds 10 to 15 kt increasing to 10 to 20 kt.
chance of showers this morning. waves 1 to 2 ft. 
.tonight...northeast winds 10 to 20 kt. waves 1 to 3 ft. 
.friday...east winds 10 to 20 kt. waves 3 to 5 ft. 
.friday night...east winds 15 to 25 kt becoming southeast to
30 kt. chance of showers in the evening, then showers overnight.
waves 4 to 6 ft occasionally to 8 ft building to 6 to 9 ft
occasionally to 12 ft. 
.saturday...southeast winds to 30 kt. showers. waves 8 to 12 ft
occasionally to 16 ft. 
.saturday night...east winds 15 to 25 kt becoming northeast.
showers likely with a chance of thunderstorms. waves 6 to 9 ft
occasionally to 12 ft. 
.sunday...northeast winds to 30 kt increasing to gales to 35 kt.
chance of showers. waves 7 to 10 ft occasionally to 13 ft
building to 8 to 11 ft occasionally to 14 ft. 
.monday...east winds to 30 kt becoming northeast gales to 35 kt.
chance of showers. waves 7 to 10 ft occasionally to 13 ft
building to 8 to 11 ft occasionally to 14 ft.  

$$

fzus63 kmqt 170801
glfls 
expires:202609172000;;589905

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 17 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...

this morning, a 29.8 inch low over the western hudson bay is 
extending weak 30.2 inch troughing over lake superior, which is 
flanked by 30.3 inch highs over quebec and southern manitoba 
respectively. throughout today, the low and assocated trough will 
push east and weaken while the western high will move over the 
ontario/manitoba line. this high builds to 30.4 inches over northern 
lake superior and northern ontario by friday morning as a 29.9 inch 
low develops over nebraska. by saturday, the high weakens to 30.3 
inches over quebec as the low extends over iowa. meanwhile, a 30.2 
inch high builds over the canadian prairie. throughout the weekend, 
the prairies high will build to 30.3 inches as it moves over 
northern ontario as the low passes south of the great lakes. the 
high builds to 30.4 inches monday and expands over western quebec 
before building to 30.5 inches over quebec tuesday.




lsz263-172000-
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 17 2026

.early this morning...southwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...west winds 5 to 15 knots. waves calm to 2 feet. 
.tonight...west winds 5 to 15 knots veering northeast after
midnight, then veering east late. waves building to 1 to 3 feet. 
.friday...east winds 5 to 15 knots increasing to 10 to 20 knots
late. a slight chance of showers by mid afternoon. waves
subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.friday night...east winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. a chance of showers. waves subsiding to
calm to 2 feet. 
.saturday...east winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.saturday night...northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.sunday...northeast winds 20 to 30 knots veering east. waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
calm to 2 feet. 
.monday...east winds 15 to 25 knots veering southeast. waves
building to 1 to 3 feet, then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 170801
glfls 
expires:202609172000;;589906

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 17 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...

this morning, a 29.8 inch low over the western hudson bay is 
extending weak 30.2 inch troughing over lake superior, which is 
flanked by 30.3 inch highs over quebec and southern manitoba 
respectively. throughout today, the low and assocated trough will 
push east and weaken while the western high will move over the 
ontario/manitoba line. this high builds to 30.4 inches over northern 
lake superior and northern ontario by friday morning as a 29.9 inch 
low develops over nebraska. by saturday, the high weakens to 30.3 
inches over quebec as the low extends over iowa. meanwhile, a 30.2 
inch high builds over the canadian prairie. throughout the weekend, 
the prairies high will build to 30.3 inches as it moves over 
northern ontario as the low passes south of the great lakes. the 
high builds to 30.4 inches monday and expands over western quebec 
before building to 30.5 inches over quebec tuesday.




lsz264-172000-
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 17 2026

.early this morning...southwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...west winds 5 to 15 knots. waves calm to 2 feet. 
.tonight...north winds 5 to 15 knots veering east late. waves
building to 1 to 3 feet. 
.friday...east winds 5 to 15 knots. waves subsiding to calm to
2 feet. 
.friday night...southeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves calm to 2 feet. 
.saturday...southeast winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.saturday night...east winds 5 to 15 knots becoming north 15 to
25 knots after midnight. waves building to 1 to 3 feet. 
.sunday...northeast winds 15 to 25 knots becoming east 5 to
15 knots. waves building to 2 to 4 feet, then subsiding to calm
to 2 feet. 
.monday...east winds 5 to 15 knots veering southeast. waves
building to 1 to 3 feet, then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 170801
glfls 
expires:202609172000;;589907

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 17 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...

this morning, a 29.8 inch low over the western hudson bay is 
extending weak 30.2 inch troughing over lake superior, which is 
flanked by 30.3 inch highs over quebec and southern manitoba 
respectively. throughout today, the low and assocated trough will 
push east and weaken while the western high will move over the 
ontario/manitoba line. this high builds to 30.4 inches over northern 
lake superior and northern ontario by friday morning as a 29.9 inch 
low develops over nebraska. by saturday, the high weakens to 30.3 
inches over quebec as the low extends over iowa. meanwhile, a 30.2 
inch high builds over the canadian prairie. throughout the weekend, 
the prairies high will build to 30.3 inches as it moves over 
northern ontario as the low passes south of the great lakes. the 
high builds to 30.4 inches monday and expands over western quebec 
before building to 30.5 inches over quebec tuesday.




lsz265-172000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 am edt thu sep 17 2026

.early this morning...southwest winds 10 to 20 knots. a slight
chance of showers. waves calm to 2 feet. 
.today...west winds 5 to 15 knots becoming northwest 10 to
20 knots late. waves calm to 2 feet. 
.tonight...northwest winds 10 to 20 knots veering northeast after
midnight. waves building to 1 to 3 feet. 
.friday...east winds 10 to 20 knots increasing to 15 to 25 knots
late. waves 1 to 3 feet. 
.friday night...southeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. a slight chance of showers after
midnight. waves subsiding to calm to 2 feet. 
.saturday...southeast winds 15 to 25 knots becoming east 10 to
20 knots by mid afternoon. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.saturday night...east winds 10 to 20 knots becoming north 15 to
25 knots after midnight. waves building to 1 to 3 feet. 
.sunday...northeast winds 20 to 30 knots becoming east 15 to
25 knots. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet. 
.monday...east winds 15 to 25 knots becoming southeast 10 to
20 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 170801
glfls 
expires:202609172000;;589908

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 17 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...

this morning, a 29.8 inch low over the western hudson bay is 
extending weak 30.2 inch troughing over lake superior, which is 
flanked by 30.3 inch highs over quebec and southern manitoba 
respectively. throughout today, the low and assocated trough will 
push east and weaken while the western high will move over the 
ontario/manitoba line. this high builds to 30.4 inches over northern 
lake superior and northern ontario by friday morning as a 29.9 inch 
low develops over nebraska. by saturday, the high weakens to 30.3 
inches over quebec as the low extends over iowa. meanwhile, a 30.2 
inch high builds over the canadian prairie. throughout the weekend, 
the prairies high will build to 30.3 inches as it moves over 
northern ontario as the low passes south of the great lakes. the 
high builds to 30.4 inches monday and expands over western quebec 
before building to 30.5 inches over quebec tuesday.




lsz266-172000-
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 17 2026

.early this morning...southwest winds 5 to 15 knots. a slight
chance of showers. waves calm to 2 feet. 
.today...west winds 5 to 15 knots veering northwest in the
afternoon. waves calm to 2 feet. 
.tonight...north winds 10 to 20 knots veering northeast late.
waves building to 1 to 3 feet. 
.friday...east winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. waves subsiding to calm to 2 feet. 
.friday night...east winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. a slight chance of showers after
midnight. waves calm to 2 feet. 
.saturday...southeast winds 10 to 20 knots becoming east 5 to
15 knots by mid afternoon. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.saturday night...east winds 5 to 15 knots becoming north 15 to
25 knots after midnight. waves building to 1 to 3 feet. 
.sunday...northeast winds 20 to 30 knots becoming east 15 to
25 knots. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.monday...east winds 5 to 15 knots. waves subsiding to calm to
2 feet. 

$$

fzus63 kmqt 170801
glfls 
expires:202609172000;;589909

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 17 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...

this morning, a 29.8 inch low over the western hudson bay is 
extending weak 30.2 inch troughing over lake superior, which is 
flanked by 30.3 inch highs over quebec and southern manitoba 
respectively. throughout today, the low and assocated trough will 
push east and weaken while the western high will move over the 
ontario/manitoba line. this high builds to 30.4 inches over northern 
lake superior and northern ontario by friday morning as a 29.9 inch 
low develops over nebraska. by saturday, the high weakens to 30.3 
inches over quebec as the low extends over iowa. meanwhile, a 30.2 
inch high builds over the canadian prairie. throughout the weekend, 
the prairies high will build to 30.3 inches as it moves over 
northern ontario as the low passes south of the great lakes. the 
high builds to 30.4 inches monday and expands over western quebec 
before building to 30.5 inches over quebec tuesday.




lsz267-172000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 am edt thu sep 17 2026

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

$$

fzus63 kmqt 170801
glfls 
expires:202609172000;;589904

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 17 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...

this morning, a 29.8 inch low over the western hudson bay is 
extending weak 30.2 inch troughing over lake superior, which is 
flanked by 30.3 inch highs over quebec and southern manitoba 
respectively. throughout today, the low and assocated trough will 
push east and weaken while the western high will move over the 
ontario/manitoba line. this high builds to 30.4 inches over northern 
lake superior and northern ontario by friday morning as a 29.9 inch 
low develops over nebraska. by saturday, the high weakens to 30.3 
inches over quebec as the low extends over iowa. meanwhile, a 30.2 
inch high builds over the canadian prairie. throughout the weekend, 
the prairies high will build to 30.3 inches as it moves over 
northern ontario as the low passes south of the great lakes. the 
high builds to 30.4 inches monday and expands over western quebec 
before building to 30.5 inches over quebec tuesday.




lsz162-172000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt thu sep 17 2026 /301 am cdt thu sep 17 2026/

.early this morning...west winds 5 to 15 knots. waves calm to
2 feet. 
.today...west winds 5 to 15 knots backing southwest in the
afternoon. waves calm to 2 feet. 
.tonight...west winds 5 to 15 knots veering northeast after
midnight, then becoming east 10 to 20 knots late. waves building
to 1 to 3 feet. 
.friday...east winds 10 to 20 knots increasing to 15 to 25 knots
late. a slight chance of showers by mid afternoon. waves 1 to
3 feet. 
.friday night...east winds 10 to 20 knots. a chance of showers.
waves 1 to 3 feet. 
.saturday...east winds 15 to 25 knots backing northeast by mid
afternoon. waves building to 2 to 4 feet, then subsiding to calm
to 2 feet. 
.saturday night...northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.sunday...northeast gales to 35 knots becoming east 20 to
30 knots. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet. 
.monday...east winds 20 to 30 knots diminishing to 15 to
25 knots. waves subsiding to calm to 2 feet, then building to
2 to 4 feet. 

$$