fzus61 kbuf 120802
glflo 
expires:202607121500;;835375

open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sun jul 12 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 large 30.2 inch high will continue to build south 
across the lower great lakes today, before sliding east into new 
england monday, then off the coast by tuesday. this will allow a 
warm front to sweep across the lake tuesday, followed by a cold 
front pushing south across the lake on wednesday, trailed by a 
secondary cold front pushing south across the lake thursday.


loz063>065-121500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sun jul 12 2026

.today...east winds 10 knots or less becoming north. waves 1 foot
or less. 
.tonight...south winds less than 10 knots. waves 1 foot or less. 
.monday...southwest winds 5 to 10 knots becoming west. waves
1 foot or less. 
.monday night...southwest winds 5 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet. 
.tuesday...southwest winds 15 to 25 knots becoming west. waves
3 to 6 feet building to 4 to 7 feet. waves occasionally around
9 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.thursday...northwest winds 5 to 15 knots. waves 1 to 3 feet. 

$$

fzus61 kbuf 120802
glflo 
expires:202607121500;;835374

open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sun jul 12 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 large 30.2 inch high will continue to build south 
across the lower great lakes today, before sliding east into new 
england monday, then off the coast by tuesday. this will allow a 
warm front to sweep across the lake tuesday, followed by a cold 
front pushing south across the lake on wednesday, trailed by a 
secondary cold front pushing south across the lake thursday.


loz062-121500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt sun jul 12 2026

.today...northeast winds less than 10 knots becoming east. waves
1 foot or less. 
.tonight...southeast winds less than 10 knots. waves 1 foot or
less. 
.monday...light and variable winds becoming southwest 5 to
10 knots. waves 1 foot or less. 
.monday night...southwest winds 10 to 15 knots increasing to
15 to 20 knots. waves 1 to 3 feet. 
.tuesday...southwest winds 15 to 20 knots becoming west. waves
2 to 4 feet building to 3 to 6 feet. 
.wednesday...west winds 5 to 15 knots becoming northwest. waves
2 to 4 feet subsiding to 1 to 2 feet. 
.thursday...west winds 5 to 15 knots becoming northwest. waves
1 to 2 feet. 

$$

fzus61 kcle 120817
glfle 
expires:202607121415;;836605

open lake forecast for lake erie
national weather service cleveland oh
417 am edt sun jul 12 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...
high pressure of 30.20 inches will build over great lakes today 
and tomorrow before settling south to the ohio valley on tuesday.
high pressure will persist through thursday.


lez162-163-121415-
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-
417 am edt sun jul 12 2026

.today...northeast winds 10 to 15 knots becoming east. waves 1 to
3 feet. 
.tonight...east winds 5 to 15 knots becoming northeast less than
10 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.monday...northeast winds less than 10 knots becoming east. waves
1 foot or less. 
.monday night...southeast winds 10 knots or less becoming
southwest. waves 1 foot or less. 
.tuesday...southwest winds 5 to 15 knots becoming west. waves
2 feet or less. 
.wednesday...west winds 5 to 10 knots becoming northeast. waves
2 feet or less. 
.thursday...north winds 5 to 10 knots becoming northeast. waves
1 foot or less. 

$$

fzus61 kcle 120817
glfle 
expires:202607121415;;836607

open lake forecast for lake erie
national weather service cleveland oh
417 am edt sun jul 12 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...
high pressure of 30.20 inches will build over great lakes today 
and tomorrow before settling south to the ohio valley on tuesday.
high pressure will persist through thursday.


lez061-167>169-121415-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-willowick to geneva-on-the-
lake oh beyond 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-
417 am edt sun jul 12 2026

.today...east winds 10 to 15 knots becoming northeast 15 to
20 knots. waves 1 to 3 feet. 
.tonight...northeast winds 5 to 15 knots becoming east less than
10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.monday...southeast winds less than 10 knots becoming northwest.
waves 1 foot or less. 
.monday night...southwest winds 10 knots or less. waves 1 foot or
less. 
.tuesday...southwest winds 10 to 15 knots becoming west. waves
1 to 2 feet building to 2 to 4 feet. 
.wednesday...west winds 5 to 10 knots becoming north. waves 1 to
3 feet. 
.thursday...northwest winds 5 to 10 knots becoming north. waves
2 feet or less. 

$$

fzus61 kcle 120817
glfle 
expires:202607121415;;836606

open lake forecast for lake erie
national weather service cleveland oh
417 am edt sun jul 12 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...
high pressure of 30.20 inches will build over great lakes today 
and tomorrow before settling south to the ohio valley on tuesday.
high pressure will persist through thursday.


lez164>166-121415-
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-
417 am edt sun jul 12 2026

.today...east winds 10 to 15 knots becoming northeast 15 to
20 knots. waves 2 to 4 feet. 
.tonight...northeast winds 15 to 20 knots becoming east and
diminishing to less than 10 knots. waves 2 to 4 feet subsiding to
1 to 2 feet. 
.monday...northeast winds less than 10 knots becoming north.
waves 1 foot or less. 
.monday night...east winds 10 knots or less becoming southwest.
waves 1 foot or less. 
.tuesday...southwest winds 10 to 15 knots becoming west. waves
1 to 3 feet. 
.wednesday...west winds 5 to 10 knots becoming north. waves 1 to
3 feet. 
.thursday...north winds 10 knots or less becoming northeast.
waves 2 feet or less. 

$$

fzus63 kdtx 120650
glfsc 
expires:202607121500;;833214

lake st clair forecast
national weather service detroit/pontiac mi
250 am edt sun jul 12 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...broad area of high pressure will continue to influence
the quiet weather over the great lakes region through the
weekend. the high pressure system will strengthen slightly to
30.20 inches sunday, bringing benign marine conditions.


lcz460-121500-
lake st clair-
250 am edt sun jul 12 2026

.today...east winds 5 to 10 knots. sunny. waves 2 feet or less.
.tonight...east winds 5 to 10 knots this evening becoming light and
variable. clear. waves 2 feet or less.
.monday...light and variable winds becoming south 5 to 10 knots in
the late morning and afternoon. sunny. waves 2 feet or less.
.monday night...south winds 5 to 10 knots. clear. waves 2 feet or
less.
.tuesday...southwest winds 5 to 10 knots increasing to 10 to 15
knots in the afternoon and evening. clear. waves 2 feet or less.
.wednesday...northeast winds 10 to 15 knots. clear. waves 2 feet or
less.
.thursday...northeast winds 5 to 10 knots. mostly clear. waves 2
feet or less.

$$

fzus63 kdtx 120649
glflh 
expires:202607121500;;833204

open lake forecast for lake huron
national weather service detroit/pontiac mi
249 am edt sun jul 12 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...broad area of high pressure will continue to influence
the quiet weather over the great lakes region through the
weekend. the high pressure system will strengthen slightly to
30.20 inches sunday, bringing benign marine conditions.


lhz362-363-121500-
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-
249 am edt sun jul 12 2026

.today...light and variable winds becoming southeast 5 to
10 knots late in the afternoon. waves 2 feet or less. 
.tonight...south winds 5 to 10 knots increasing to 10 to 15 knots
in the late evening and overnight. waves 1 to 3 feet. 
.monday...southwest winds 10 to 15 knots decreasing to 5 to
10 knots in the late morning and early afternoon...then becoming
south 10 to 15 knots early in the afternoon. waves 1 to 3 feet. 
.monday night...south winds 5 to 10 knots becoming southwest
10 to 15 knots after midnight. waves 1 to 3 feet. 
.tuesday...southwest winds 10 to 15 knots veering to the west
late in the evening. waves 3 to 5 feet. 
.wednesday...northwest winds 5 to 10 knots increasing to 10 to
15 knots . waves 1 to 3 feet building to 2 to 4 feet . 
.thursday...northwest winds 5 to 10 knots veering to the north .
waves 1 to 3 feet. 


$$

fzus63 kdtx 120649
glflh 
expires:202607121500;;833203

open lake forecast for lake huron
national weather service detroit/pontiac mi
249 am edt sun jul 12 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...broad area of high pressure will continue to influence
the quiet weather over the great lakes region through the
weekend. the high pressure system will strengthen slightly to
30.20 inches sunday, bringing benign marine conditions.


lhz361-121500-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
249 am edt sun jul 12 2026

.today...southwest winds 5 to 10 knots early in the morning
becoming light and variable...then becoming southeast 5 to
10 knots in the afternoon. waves 2 feet or less. 
.tonight...southeast winds 5 to 10 knots veering to the south by
midnight...then becoming southwest 10 to 15 knots early in the
morning. waves 1 to 3 feet. 
.monday...southwest winds 10 to 15 knots becoming west 5 to
10 knots early in the afternoon. waves 1 to 3 feet. 
.monday night...southwest winds 5 to 10 knots becoming west 10 to
15 knots after midnight. waves 1 to 3 feet building to 2 to
4 feet after midnight. 
.tuesday...west winds 15 to 20 knots becoming northwest 10 to
15 knots late in the evening. waves 3 to 5 feet. 
.wednesday...northwest winds 5 to 10 knots increasing to 10 to
15 knots . waves 1 to 3 feet building to 2 to 4 feet . 
.thursday...northwest winds 5 to 10 knots increasing to 10 to
15 knots . waves 1 to 3 feet. 


$$

fzus63 kdtx 120649
glflh 
expires:202607121500;;833205

open lake forecast for lake huron
national weather service detroit/pontiac mi
249 am edt sun jul 12 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...broad area of high pressure will continue to influence
the quiet weather over the great lakes region through the
weekend. the high pressure system will strengthen slightly to
30.20 inches sunday, bringing benign marine conditions.


lhz462>464-121500-
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-
249 am edt sun jul 12 2026

.today...light and variable winds. waves 2 feet or less. 
.tonight...light and variable winds becoming south 5 to 10 knots
after midnight. waves 2 feet or less. 
.monday...southwest winds 5 to 10 knots backing to the south
early in the afternoon. waves 2 feet or less. 
.monday night...south winds 5 to 10 knots becoming southwest
10 to 15 knots in the late evening and overnight. waves 1 to
3 feet. 
.tuesday...southwest winds 10 to 15 knots veering to the west
late in the evening. waves 1 to 3 feet building to 2 to 4 feet
late in the morning...then subsiding to 1 to 3 feet late in the
evening. 
.wednesday...northwest winds 5 to 10 knots. waves 1 to 3 feet. 
.thursday...north winds 5 to 10 knots. waves 2 feet or less. 


$$

fzus63 kmkx 120804
glflm 
expires:202607121530;;835648

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
304 am cdt sun jul 12 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...

high pressure of 30.2 inches over the great lakes region will
maintain an axis roughly from northern iowa to southern lower 
michigan through monday and then sink into illinois and indiana 
tuesday and wednesday while weakening to 30.1 inches. low pressure
around 29.6 inches will approach from the northern plains thursday
into friday. look for winds over lake michigan to become 
southerly across the north half sunday and light and variable in 
the south. winds will become south-southwesterly monday and
increase a bit by tuesday. a weak cold front will bring a wind
shift to the north-northeast wednesday into thursday.


lmz261-362-364-366-563-565-567-868-121530-
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-
304 am cdt sun jul 12 2026

sheboygan wi to pentwater mi north...

.today...south winds 10 to 15 kt becoming southwest 10 to 20 kt.
waves 2 to 4 ft. 
.tonight...southwest winds 10 to 20 kt. waves 2 to 4 ft. 
.monday...southwest winds 10 to 20 kt. waves 1 to 3 ft. 
.monday night...southwest winds 10 to 20 kt. waves 1 to 3 ft. 
.tuesday...west winds 15 to 25 kt becoming southwest to 30 kt.
waves 2 to 4 ft. 
.tuesday night...west winds 15 to 25 kt becoming northwest 10 to
15 kt. waves 2 to 4 ft. 
.wednesday...north winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 3 ft. 
.thursday...north winds 10 to 15 kt becoming northwest 10 to
20 kt. waves 1 to 2 ft.  

$$

fzus63 kmkx 120804
glflm 
expires:202607121530;;835649

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
304 am cdt sun jul 12 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...

high pressure of 30.2 inches over the great lakes region will
maintain an axis roughly from northern iowa to southern lower 
michigan through monday and then sink into illinois and indiana 
tuesday and wednesday while weakening to 30.1 inches. low pressure
around 29.6 inches will approach from the northern plains thursday
into friday. look for winds over lake michigan to become 
southerly across the north half sunday and light and variable in 
the south. winds will become south-southwesterly monday and
increase a bit by tuesday. a weak cold front will bring a wind
shift to the north-northeast wednesday into thursday.


lmz080-669-671-673-675-777-779-870-872-874-876-878-121530-
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-
304 am cdt sun jul 12 2026

sheboygan wi to pentwater mi south...

.today...east winds 5 to 10 kt backing to northwest 10 to 15 kt.
waves 1 to 2 ft. 
.tonight...west winds 10 to 15 kt becoming southwest. waves 1 to
2 ft. 
.monday...southwest winds 10 to 15 kt becoming south. waves 1 to
2 ft. 
.monday night...southwest winds 10 to 15 kt. waves 1 to 2 ft. 
.tuesday...west winds 10 to 15 kt becoming southwest 10 to 20 kt.
waves 1 to 2 ft. 
.tuesday night...southwest winds 10 to 20 kt becoming west 10 to
15 kt. waves 1 to 3 ft. 
.wednesday...northwest winds 10 to 15 kt becoming north 10 to
20 kt. waves 1 to 3 ft. 
.thursday...northeast winds 5 to 10 kt becoming north 10 to
20 kt. waves 1 to 2 ft.  

$$

fzus63 kmqt 120801
glfls 
expires:202607122000;;835235

open lake forecast for lake superior
national weather service marquette mi
400 am edt sun jul 12 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... 

high pressure of 30.1 inches is draped from quebec to the upper 
great lakes this morning. this surface high then shifts south toward 
the lower great lakes as pressure falls over the lake to 29.9 inches 
by sunday night. early next week a strong low of around 29.3 inches 
tracks northeast from the northern plains toward hudson bay, keeping 
pressure over lake superior at 29.9 inches through tuesday morning. 
wednesday, high pressure extending from the canadian prairies to the 
southern appalachians weakens slightly as the canadian low deepens 
to 29.1 inches in northern quebec. lake superior remains under weak 
high pressure wednesday into thursday at 30.0 inches.




lsz267-122000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 am edt sun jul 12 2026

.early this morning...south winds 10 to 20 knots. waves calm to
2 feet building to 1 to 3 feet. 
.today...south winds 10 to 20 knots. a chance of showers and
thunderstorms by mid afternoon. waves subsiding to calm to
2 feet. 
.tonight...south winds 10 to 20 knots veering southwest after
midnight. waves calm to 2 feet. 
.monday...southwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon, then backing southeast late. waves
building to 1 to 3 feet, then subsiding to calm to 2 feet. 
.monday night...south winds 10 to 20 knots becoming west 15 to
25 knots after midnight. waves building to 4 to 7 feet
occasionally to 9 feet. 
.tuesday...west winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to 2 to 4 feet. 
.tuesday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 10 to 20 knots becoming northwest 5 to
15 knots. waves calm to 2 feet. 
.thursday...northwest winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 120801
glfls 
expires:202607122000;;835232

open lake forecast for lake superior
national weather service marquette mi
400 am edt sun jul 12 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... 

high pressure of 30.1 inches is draped from quebec to the upper 
great lakes this morning. this surface high then shifts south toward 
the lower great lakes as pressure falls over the lake to 29.9 inches 
by sunday night. early next week a strong low of around 29.3 inches 
tracks northeast from the northern plains toward hudson bay, keeping 
pressure over lake superior at 29.9 inches through tuesday morning. 
wednesday, high pressure extending from the canadian prairies to the 
southern appalachians weakens slightly as the canadian low deepens 
to 29.1 inches in northern quebec. lake superior remains under weak 
high pressure wednesday into thursday at 30.0 inches.




lsz264-122000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 am edt sun jul 12 2026

.early this morning...southwest winds 5 to 15 knots. a slight
chance of showers and thunderstorms. waves calm to 2 feet. 
.today...southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. a chance of showers and a slight chance of thunderstorms
through early afternoon. waves building to 2 to 4 feet. 
.tonight...southwest winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then veering west late. a slight chance
of showers through midnight. waves building to 3 to 5 feet
occasionally to 7 feet. 
.monday...west winds 10 to 20 knots becoming southwest 15 to
25 knots in the afternoon, then increasing to 20 to 30 knots
late. waves subsiding to 2 to 4 feet, then building to 3 to
6 feet occasionally to 8 feet. 
.monday night...southwest winds 20 to 30 knots veering west after
midnight. waves building to 4 to 8 feet occasionally to 10 feet. 
.tuesday...west winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to 1 to 3 feet. 
.tuesday night...west winds 5 to 15 knots veering northwest after
midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots. waves calm to 2 feet. 
.thursday...northwest winds 5 to 15 knots veering east. waves
calm to 2 feet. 

$$

fzus63 kmqt 120801
glfls 
expires:202607122000;;835234

open lake forecast for lake superior
national weather service marquette mi
400 am edt sun jul 12 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... 

high pressure of 30.1 inches is draped from quebec to the upper 
great lakes this morning. this surface high then shifts south toward 
the lower great lakes as pressure falls over the lake to 29.9 inches 
by sunday night. early next week a strong low of around 29.3 inches 
tracks northeast from the northern plains toward hudson bay, keeping 
pressure over lake superior at 29.9 inches through tuesday morning. 
wednesday, high pressure extending from the canadian prairies to the 
southern appalachians weakens slightly as the canadian low deepens 
to 29.1 inches in northern quebec. lake superior remains under weak 
high pressure wednesday into thursday at 30.0 inches.




lsz266-122000-
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-
400 am edt sun jul 12 2026

.early this morning...south winds 10 to 20 knots. waves calm to
2 feet building to 1 to 3 feet. 
.today...southwest winds 10 to 20 knots backing south in the
afternoon. a slight chance of showers and thunderstorms. waves
subsiding to calm to 2 feet. 
.tonight...south winds 10 to 20 knots becoming southwest 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
waves building to 2 to 4 feet. 
.monday...west winds 10 to 20 knots becoming south 15 to 25 knots
late. waves building to 3 to 6 feet occasionally to 8 feet. 
.monday night...southwest winds 20 to 30 knots veering west after
midnight. waves building to 5 to 8 feet occasionally to 10 feet. 
.tuesday...west winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to 2 to 4 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves subsiding
to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots. waves calm to 2 feet.
.thursday...northwest winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 120801
glfls 
expires:202607122000;;835233

open lake forecast for lake superior
national weather service marquette mi
400 am edt sun jul 12 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... 

high pressure of 30.1 inches is draped from quebec to the upper 
great lakes this morning. this surface high then shifts south toward 
the lower great lakes as pressure falls over the lake to 29.9 inches 
by sunday night. early next week a strong low of around 29.3 inches 
tracks northeast from the northern plains toward hudson bay, keeping 
pressure over lake superior at 29.9 inches through tuesday morning. 
wednesday, high pressure extending from the canadian prairies to the 
southern appalachians weakens slightly as the canadian low deepens 
to 29.1 inches in northern quebec. lake superior remains under weak 
high pressure wednesday into thursday at 30.0 inches.




lsz265-122000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 am edt sun jul 12 2026

.early this morning...southwest winds 10 to 20 knots. waves calm
to 2 feet. 
.today...southwest winds 10 to 20 knots backing south in the
afternoon. a slight chance of showers and thunderstorms. waves
calm to 2 feet. 
.tonight...south winds 10 to 20 knots becoming southwest 15 to
25 knots after midnight, then veering west late. waves building
to 2 to 4 feet. 
.monday...west winds 15 to 25 knots diminishing to 10 to 20 knots
in the afternoon, then becoming southwest 15 to 25 knots late.
waves subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.monday night...southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet. 
.tuesday...west winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.tuesday night...west winds 10 to 20 knots veering northwest
after midnight. waves calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing west. waves
calm to 2 feet. 
.thursday...north winds 5 to 15 knots backing west. waves calm to
2 feet. 

$$

fzus63 kmqt 120801
glfls 
expires:202607122000;;835230

open lake forecast for lake superior
national weather service marquette mi
400 am edt sun jul 12 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... 

high pressure of 30.1 inches is draped from quebec to the upper 
great lakes this morning. this surface high then shifts south toward 
the lower great lakes as pressure falls over the lake to 29.9 inches 
by sunday night. early next week a strong low of around 29.3 inches 
tracks northeast from the northern plains toward hudson bay, keeping 
pressure over lake superior at 29.9 inches through tuesday morning. 
wednesday, high pressure extending from the canadian prairies to the 
southern appalachians weakens slightly as the canadian low deepens 
to 29.1 inches in northern quebec. lake superior remains under weak 
high pressure wednesday into thursday at 30.0 inches.




lsz162-122000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt sun jul 12 2026 /300 am cdt sun jul 12 2026/

.early this morning...southwest winds 5 to 15 knots. a chance of
showers and thunderstorms. waves calm to 2 feet. 
.today...southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. waves building to 2 to 4 feet. 
.tonight...southwest winds 15 to 25 knots. waves subsiding to
1 to 3 feet. 
.monday...southwest winds 10 to 20 knots increasing to 20 to
30 knots. waves building to 3 to 5 feet occasionally to 7 feet. 
.monday night...southwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet. 
.tuesday...west winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.tuesday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves calm to 2 feet. 
.wednesday...north winds 5 to 15 knots. waves calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 

$$

fzus63 kmqt 120801
glfls 
expires:202607122000;;835231

open lake forecast for lake superior
national weather service marquette mi
400 am edt sun jul 12 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... 

high pressure of 30.1 inches is draped from quebec to the upper 
great lakes this morning. this surface high then shifts south toward 
the lower great lakes as pressure falls over the lake to 29.9 inches 
by sunday night. early next week a strong low of around 29.3 inches 
tracks northeast from the northern plains toward hudson bay, keeping 
pressure over lake superior at 29.9 inches through tuesday morning. 
wednesday, high pressure extending from the canadian prairies to the 
southern appalachians weakens slightly as the canadian low deepens 
to 29.1 inches in northern quebec. lake superior remains under weak 
high pressure wednesday into thursday at 30.0 inches.




lsz263-122000-
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-
400 am edt sun jul 12 2026

.early this morning...southwest winds 10 to 20 knots. a slight
chance of showers and thunderstorms. waves calm to 2 feet. 
.today...southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. a slight chance of showers and
thunderstorms through early afternoon. waves building to 2 to
4 feet. 
.tonight...southwest winds 15 to 25 knots veering west late.
waves building to 3 to 5 feet occasionally to 7 feet. 
.monday...southwest winds 10 to 20 knots increasing to 20 to
30 knots. waves subsiding to 2 to 4 feet, then building to 4 to
7 feet occasionally to 9 feet. 
.monday night...southwest winds 20 to 30 knots veering west after
midnight. waves 4 to 7 feet occasionally to 9 feet. 
.tuesday...west winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves subsiding
to calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots veering west. waves
calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots veering east. waves
calm to 2 feet. 

$$