fzus61 kbuf 170802
glflo 
expires:202609171500;;589996

open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu sep 17 2026

for waters beyond five nautical miles of shore on lake ontario

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 weak front stalled just south of the lake 
this morning will lift slightly back northward as a 30.2 inch 
surface low advances eastward along the front. this low, traveling 
south of the lake, will then carry the front southeast of the lake 
this evening. a 30.4 inch high will then build from northwest 
ontario province thursday night to southern quebec by saturday 
morning before moving off the new england coast by sunday while 
weakening to 30.2 inches. another 30.4 inch high will then build 
from northwest ontario province sunday to western quebec monday. 
meanwhile, a 29.8 inch low will move into the lower ohio valley by 
monday.


loz063>065-171500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt thu sep 17 2026

.today...southeast winds 10 knots or less becoming north. a
chance of showers early. waves 1 foot or less. 
.tonight...northwest winds 5 to 10 knots becoming north. waves
2 feet or less. 
.friday...north winds 10 to 15 knots. waves 1 to 3 feet. 
.friday night...north winds 10 to 15 knots becoming northeast.
waves 1 to 3 feet. 
.saturday...east winds 5 to 15 knots becoming southeast. showers
likely saturday night. waves 1 to 3 feet. 
.sunday...east winds 15 to 25 knots becoming northeast. showers
likely during the day. waves 1 to 3 feet building to 3 to 5 feet.
.monday...northeast winds 15 to 25 knots. waves 3 to 6 feet. 

$$

fzus61 kbuf 170802
glflo 
expires:202609171500;;589995

open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu sep 17 2026

for waters beyond five nautical miles of shore on lake ontario

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 weak front stalled just south of the lake 
this morning will lift slightly back northward as a 30.2 inch 
surface low advances eastward along the front. this low, traveling 
south of the lake, will then carry the front southeast of the lake 
this evening. a 30.4 inch high will then build from northwest 
ontario province thursday night to southern quebec by saturday 
morning before moving off the new england coast by sunday while 
weakening to 30.2 inches. another 30.4 inch high will then build 
from northwest ontario province sunday to western quebec monday. 
meanwhile, a 29.8 inch low will move into the lower ohio valley by 
monday.


loz062-171500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt thu sep 17 2026

.today...northeast winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.tonight...west winds 10 knots or less becoming north. waves
2 feet or less. 
.friday...north winds 10 knots or less. waves 2 feet or less. 
.friday night...north winds 10 to 15 knots becoming east. waves
2 feet or less building to 2 to 3 feet. 
.saturday...east winds 10 to 15 knots. showers likely saturday
night. waves 1 to 3 feet. 
.sunday...northeast winds 15 to 25 knots. showers likely during
the day. waves 2 to 3 feet building to 3 to 6 feet. 
.monday...northeast winds 15 to 25 knots becoming east to
30 knots. waves 3 to 6 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 

$$

fzus61 kcle 170752
glfle 
expires:202609171415;;589596

open lake forecast for lake erie
national weather service cleveland oh
352 am edt thu sep 17 2026

for waters beyond five nautical miles of shore on lake erie

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 stationary front will slowly sag south tonight into thursday,
followed by high pressure of 30.20 inches for friday. low 
pressure 29.90 inches will track east in the vicinity of lake erie
on saturday and extend a cold front through the area on sunday. a
trough averaging 29.90 inches will linger behind the front into 
early next week while high pressure of 30.40 inches sets up north 
of the great lakes. 


lez061-168-169-171415-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-geneva-on-the-
lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
352 am edt thu sep 17 2026

.today...northeast winds 10 knots or less becoming north. a
slight chance of showers this morning. waves 2 feet or less. 
.tonight...north winds 10 knots or less increasing to 10 to
15 knots. a slight chance of showers after midnight. waves 2 feet
or less. 
.friday...north winds 15 to 20 knots becoming northeast 5 to
15 knots. waves 1 to 3 feet. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.saturday...east winds 10 to 15 knots becoming south. a chance of
showers during the day, then showers saturday night. waves 1 to
3 feet. 
.sunday...northeast winds 15 to 25 knots. showers likely during
the day. waves 2 to 4 feet building to 3 to 6 feet. 
.monday...northeast winds to 30 knots becoming east. a chance of
showers monday night. waves 3 to 6 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 170752
glfle 
expires:202609171415;;589594

open lake forecast for lake erie
national weather service cleveland oh
352 am edt thu sep 17 2026

for waters beyond five nautical miles of shore on lake erie

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 stationary front will slowly sag south tonight into thursday,
followed by high pressure of 30.20 inches for friday. low 
pressure 29.90 inches will track east in the vicinity of lake erie
on saturday and extend a cold front through the area on sunday. a
trough averaging 29.90 inches will linger behind the front into 
early next week while high pressure of 30.40 inches sets up north 
of the great lakes. 


lez162-163-171415-
detroit river lt. to maumee bay oh to reno beach oh beyond 5nm
offshoreline to us-canadian border-
reno beach to the islands oh beyond 5nm off shoreline to us-
canadian border-
352 am edt thu sep 17 2026

.today...north winds 10 knots or less. a slight chance of showers
and thunderstorms early, then a slight chance of showers late
this morning. waves 1 foot or less. 
.tonight...northeast winds 10 knots or less increasing to 15 to
20 knots. a slight chance of showers late in the evening. waves
2 feet or less. 
.friday...northeast winds 15 to 20 knots diminishing to 10 to
15 knots. waves 1 to 3 feet. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 2 feet or less. 
.saturday...east winds 10 to 15 knots becoming southwest. showers
during the day, then showers with a chance of thunderstorms
saturday night. waves 1 to 2 feet. 
.sunday...northwest winds 15 to 25 knots becoming northeast.
showers likely during the day. waves 1 to 3 feet building to 3 to
6 feet. 
.monday...northeast winds to 30 knots. a chance of showers monday
night. waves 3 to 6 feet building to 4 to 7 feet, then subsiding
to 3 to 6 feet. waves occasionally around 9 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 170752
glfle 
expires:202609171415;;589595

open lake forecast for lake erie
national weather service cleveland oh
352 am edt thu sep 17 2026

for waters beyond five nautical miles of shore on lake erie

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 stationary front will slowly sag south tonight into thursday,
followed by high pressure of 30.20 inches for friday. low 
pressure 29.90 inches will track east in the vicinity of lake erie
on saturday and extend a cold front through the area on sunday. a
trough averaging 29.90 inches will linger behind the front into 
early next week while high pressure of 30.40 inches sets up north 
of the great lakes. 


lez164>167-171415-
the islands to vermilion oh beyond 5 nm off shoreline to us-
canadian border-
vermilion to avon point oh beyond 5 nm off shoreline to us-
canadian border-
avon point to willowick oh beyond 5 nm off shoreline to us-
canadian border-willowick to geneva-on-the-
lake oh beyond 5nm off shoreline to us-canadian border-
352 am edt thu sep 17 2026

.today...north winds 10 knots or less. a chance of showers with a
slight chance of thunderstorms early, then a chance of showers
late this morning. waves 1 foot or less. 
.tonight...north winds less than 10 knots increasing to 15 to
20 knots. waves 2 feet or less building to 2 to 4 feet. 
.friday...northeast winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.saturday...east winds 10 to 15 knots becoming southwest. showers
likely during the day, then showers with a chance of
thunderstorms saturday night. waves 1 to 3 feet. 
.sunday...northwest winds 15 to 25 knots becoming northeast to
30 knots. showers likely during the day. waves 3 to 6 feet
building to 4 to 7 feet. waves occasionally around 9 feet. 
.monday...east winds to 30 knots. a chance of showers monday
night. waves 5 to 8 feet. waves occasionally around 10 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 171353
glfsc 
expires:202609172200;;603118

lake st clair forecast
national weather service detroit/pontiac mi
953 am edt thu sep 17 2026

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.


lcz460-172200-
lake st clair-
953 am edt thu sep 17 2026

.rest of today...north winds 5 to 10 knots. partly sunny. waves 2
feet or less.
.tonight...northeast winds 5 to 10 knots becoming north 10 to 15
knots in the late evening and overnight. partly cloudy becoming
mostly cloudy late this evening becoming partly cloudy. waves 2 feet
or less.
.friday...north winds 10 to 15 knots becoming northeast 5 to 10
knots in the late morning and early afternoon...then increasing to
10 to 15 knots early in the afternoon. partly sunny. waves 2 feet or
less.
.friday night...northeast winds 15 to 20 knots diminishing to 10 to
15 knots in the late evening and overnight. mostly cloudy. waves 1
to 3 feet.
.saturday...east winds 10 to 15 knots. showers likely in the
morning. showers in the afternoon and evening. a chance of
thunderstorms in the evening. waves 2 feet or less.
.sunday...northeast winds 20 to 25 knots. showers. waves 1 to 3
feet.
.monday...northeast winds 20 to 25 knots with gusts to 30 knots.
partly cloudy. waves 2 to 4 feet. a small craft advisory may be
needed.

$$

fzus63 kdtx 171351
glflh 
expires:202609172200;;603112

open lake forecast for lake huron
national weather service detroit/pontiac mi
951 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.


lhz361-172200-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
951 am edt thu sep 17 2026

.rest of today...light and variable winds. waves nearly calm. 
.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 subsiding to 1 to 3 feet early in the
evening...then building to 2 to 4 feet by midnight. 


$$

fzus63 kdtx 171351
glflh 
expires:202609172200;;603113

open lake forecast for lake huron
national weather service detroit/pontiac mi
951 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.


lhz362-363-172200-
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-
951 am edt thu sep 17 2026

.rest of today...light and variable winds. 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. 
.friday...north winds 10 to 15 knots becoming northeast 5 to
10 knots early in the afternoon. waves 2 to 4 feet subsiding to
1 to 3 feet early in the afternoon. 
.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. 
.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 2 to 4 feet building to 4 to 6 feet. waves
occasionally around 8 feet. 
.monday...northeast winds 15 to 20 knots. gusts to 30 knots early
in the evening. waves 4 to 6 feet. 


$$

fzus63 kdtx 171351
glflh 
expires:202609172200;;603114

open lake forecast for lake huron
national weather service detroit/pontiac mi
951 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>464-172200-
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-
951 am edt thu sep 17 2026

.rest of 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 2 to 4 feet subsiding to 1 to
3 feet in the late evening and overnight. 
.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. 
.sunday...northeast winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers early in the morning. waves 2 to
4 feet building to 4 to 6 feet. waves occasionally around 8 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 4 to 6 feet. waves
occasionally around 8 feet. 


$$

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 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 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;;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;;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;;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. 

$$

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;;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. 

$$