fzus61 kbuf 172002
glflo 
expires:202509180300;;151052

open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt wed sep 17 2025

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 30.3 inch high across quebec will drift east off the 
new england coast by tonight, while remaining ridged over the lake. 
a cold front will cross the lake thursday night, with another area 
of high pressure over western ontario builds southeast across the 
lower great lakes friday and saturday.


loz063>065-180300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt wed sep 17 2025

.tonight...east winds 10 knots or less becoming southwest. waves
1 foot or less. 
.thursday...southwest winds 5 to 15 knots becoming west. patchy
fog early. waves 2 feet or less. 
.thursday night...west winds 10 to 15 knots becoming north 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.friday...north winds 15 to 20 knots becoming northwest 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday night...northwest winds 5 to 15 knots becoming northeast.
waves 1 to 3 feet. 
.saturday...northeast winds 5 to 15 knots becoming southeast.
waves 1 to 3 feet. 
.sunday...southeast winds 10 to 15 knots becoming south 15 to
20 knots. a chance of showers sunday night. waves 2 to 4 feet
building to 3 to 5 feet. 
.monday...south winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers. waves 3 to 5 feet subsiding to
1 to 3 feet. 

$$

fzus61 kbuf 172002
glflo 
expires:202509180300;;151051

open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt wed sep 17 2025

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 30.3 inch high across quebec will drift east off the 
new england coast by tonight, while remaining ridged over the lake. 
a cold front will cross the lake thursday night, with another area 
of high pressure over western ontario builds southeast across the 
lower great lakes friday and saturday.


loz062-180300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt wed sep 17 2025

.tonight...east winds less than 10 knots becoming west. areas of
fog after midnight. waves 1 foot or less. 
.thursday...west winds 5 to 10 knots becoming southwest. areas of
fog in the morning. waves 1 foot or less. 
.thursday night...west winds 5 to 15 knots becoming north 15 to
20 knots. waves 2 feet or less building to 2 to 3 feet. 
.friday...north winds 15 to 20 knots diminishing to less than
10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.friday night...north winds 10 knots or less becoming east and
increasing to 15 to 20 knots overnight. waves 2 feet or less
building to 2 to 3 feet. 
.saturday...east winds 10 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.sunday...southeast winds 5 to 10 knots becoming south. a chance
of showers sunday night. waves 1 to 2 feet. 
.monday...south winds 5 to 10 knots becoming southwest. a chance
of showers. waves 1 to 2 feet. 

$$

fzus61 kcle 171941
glfle 
expires:202509180215;;150094

open lake forecast for lake erie
national weather service cleveland oh
341 pm edt wed sep 17 2025

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 ridging averaging 30.20 inches and extending from
new england lingers over lake erie before a cold front sweeps
generally southward across the lake thursday evening into thursday
night. behind the front, another ridge averaging 30.20 inches 
affects lake erie as the parent high pressure center moves from 
near hudson bay thursday evening to atlantic waters near nova 
scotia by this monday. however, a warm front will sweep northward 
across lake erie on sunday into early monday.


lez164>168-180215-
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-geneva-on-
the-lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
341 pm edt wed sep 17 2025

.tonight...east winds less than 10 knots. waves 1 foot or less. 
.thursday...west winds 10 knots or less. waves 1 foot or less. 
.thursday night...southwest winds 5 to 10 knots becoming
northeast. waves 1 foot or less. 
.friday...northeast winds 5 to 10 knots. waves 1 to 2 feet. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.saturday...east winds 10 to 15 knots becoming southeast. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.sunday...south winds 5 to 15 knots. a chance of showers sunday
night. waves 1 to 3 feet. 
.monday...south winds 5 to 15 knots. a chance of showers. waves
1 to 3 feet. 

$$

fzus61 kcle 171941
glfle 
expires:202509180215;;150095

open lake forecast for lake erie
national weather service cleveland oh
341 pm edt wed sep 17 2025

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 ridging averaging 30.20 inches and extending from
new england lingers over lake erie before a cold front sweeps
generally southward across the lake thursday evening into thursday
night. behind the front, another ridge averaging 30.20 inches 
affects lake erie as the parent high pressure center moves from 
near hudson bay thursday evening to atlantic waters near nova 
scotia by this monday. however, a warm front will sweep northward 
across lake erie on sunday into early monday.


lez061-169-180215-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
341 pm edt wed sep 17 2025

.tonight...east winds less than 10 knots. waves 1 foot or less. 
.thursday...southwest winds 10 knots or less. waves 2 feet or
less. 
.thursday night...southwest winds 5 to 10 knots becoming
northeast. waves 1 to 2 feet. 
.friday...northeast winds around 10 knots. waves 1 to 2 feet. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.saturday...east winds 10 to 15 knots becoming southeast. waves
1 to 3 feet. 
.sunday...south winds 5 to 15 knots. a chance of showers sunday
night. waves 1 to 3 feet. 
.monday...south winds 5 to 15 knots. a chance of showers monday
night. waves 1 to 3 feet. 

$$

fzus61 kcle 171941
glfle 
expires:202509180215;;150093

open lake forecast for lake erie
national weather service cleveland oh
341 pm edt wed sep 17 2025

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 ridging averaging 30.20 inches and extending from
new england lingers over lake erie before a cold front sweeps
generally southward across the lake thursday evening into thursday
night. behind the front, another ridge averaging 30.20 inches 
affects lake erie as the parent high pressure center moves from 
near hudson bay thursday evening to atlantic waters near nova 
scotia by this monday. however, a warm front will sweep northward 
across lake erie on sunday into early monday.


lez162-163-180215-
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-
341 pm edt wed sep 17 2025

.tonight...southeast winds less than 10 knots. waves 1 foot or
less. 
.thursday...light and variable winds. waves 1 foot or less. 
.thursday night...southeast winds 10 knots or less becoming
northeast. waves 1 foot or less. 
.friday...northeast winds around 10 knots becoming east. waves
2 feet or less. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.saturday...east winds 10 to 15 knots becoming southeast. waves
1 to 3 feet. 
.sunday...southeast winds 5 to 15 knots becoming south. a chance
of showers sunday night. waves 2 feet or less. 
.monday...south winds around 10 knots. a chance of showers. waves
2 feet or less. 

$$

fzus63 kdtx 171947
glfsc 
expires:202509180400;;150316

lake st clair forecast
national weather service detroit/pontiac mi
347 pm edt wed sep 17 2025

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

.synopsis...high pressure, 30.00 inches, over the central and
eastern great lakes gradually weakens over the next 24 hours. a
stronger high developing over northern ontario forces a weak cold
front across the region tonight through thursday. the high
pressure then gradually shifts southeast across ontario before
reaching southern quebec on saturday and new england on sunday.


lcz460-180400-
lake st clair-
347 pm edt wed sep 17 2025

.tonight...light and variable winds. clear. waves nearly calm.
.thursday...light and variable winds becoming southwest 5 to 10
knots early in the afternoon...then backing to the east late in the
afternoon. mostly sunny. waves 2 feet or less.
.thursday night...northeast winds 10 to 15 knots diminishing to 5 to
10 knots in the late evening and early morning...then increasing to
10 to 15 knots after midnight. partly cloudy. waves 2 feet or less.
.friday...northeast winds 5 to 10 knots increasing to 10 to 15 knots
early in the afternoon. partly sunny. waves 2 feet or less.
.friday night...northeast winds 10 to 15 knots. mostly clear. waves
2 feet or less.
.saturday...east winds 10 to 15 knots. mostly sunny becoming partly
sunny in the afternoon becoming mostly clear. waves 2 feet or less.
.sunday...south winds 10 to 15 knots. partly cloudy. a chance of
showers. waves 2 feet or less.
.monday...south winds 10 to 15 knots. partly cloudy. a chance of
showers. waves 2 feet or less.

$$

fzus63 kdtx 171945
glflh 
expires:202509180400;;150287

open lake forecast for lake huron
national weather service detroit/pontiac mi
345 pm edt wed sep 17 2025

for waters beyond five nautical miles off shore on lake huron

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

.synopsis...high pressure, 30.00 inches, over the central and
eastern great lakes gradually weakens over the next 24 hours. a
stronger high developing over northern ontario forces a weak cold
front across the region tonight through thursday. the high
pressure then gradually shifts southeast across ontario before
reaching southern quebec on saturday and new england on sunday.


lhz462>464-180400-
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-
345 pm edt wed sep 17 2025

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


$$

fzus63 kdtx 171945
glflh 
expires:202509180400;;150285

open lake forecast for lake huron
national weather service detroit/pontiac mi
345 pm edt wed sep 17 2025

for waters beyond five nautical miles off shore on lake huron

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

.synopsis...high pressure, 30.00 inches, over the central and
eastern great lakes gradually weakens over the next 24 hours. a
stronger high developing over northern ontario forces a weak cold
front across the region tonight through thursday. the high
pressure then gradually shifts southeast across ontario before
reaching southern quebec on saturday and new england on sunday.


lhz361-180400-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
345 pm edt wed sep 17 2025

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


$$

fzus63 kdtx 171945
glflh 
expires:202509180400;;150286

open lake forecast for lake huron
national weather service detroit/pontiac mi
345 pm edt wed sep 17 2025

for waters beyond five nautical miles off shore on lake huron

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

.synopsis...high pressure, 30.00 inches, over the central and
eastern great lakes gradually weakens over the next 24 hours. a
stronger high developing over northern ontario forces a weak cold
front across the region tonight through thursday. the high
pressure then gradually shifts southeast across ontario before
reaching southern quebec on saturday and new england on sunday.


lhz362-363-180400-
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-
345 pm edt wed sep 17 2025

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


$$

fzus63 kmkx 171937
glflm 
expires:202509180315;;149939

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
237 pm cdt wed sep 17 2025

for waters beyond five nautical miles of shore on lake michigan.

waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.

.synopsis...

low pressure around 29.4 inches will continue eastward across 
northern quebec canada today, with high pressure around 30.3 
inches moving into ontario through friday. 

winds remain nearly calm through tonight, with a light northeast
wind developing over the northern half of the lake in response to
a weak backdoor cold front. this front sags southward across the
rest of the lake thursday, bringing roughly 15 kt north to
northeast winds behind it. light northeast winds continue into
friday, becoming breezy and veering southeast friday night through
saturday morning as the aforementioned high pressure system
strengthens to around 30.4 inches and approaches southern
ontario/quebec and low pressure around 29.9 inches moves into the
dakotas / minnesota. there will be chances for thunderstorms
at times this weekend. 


lmz080-669-671-673-675-777-779-870-872-874-876-878-180315-
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-
237 pm cdt wed sep 17 2025

sheboygan wi to pentwater mi south...

.tonight...northwest winds 10 to 15 kt backing to southeast late
this evening, then becoming southeast 5 to 10 kt after midnight
diminishing to less than 10 kt late. waves 1 to 2 ft. 
.thursday...south winds 5 to 10 kt backing to north. waves 1 to
2 ft. 
.thursday night...north winds 10 to 15 kt becoming east. waves
1 to 3 ft. 
.friday...east winds 10 to 15 kt becoming northeast. waves 1 to
3 ft. 
.friday night...northeast winds 10 to 20 kt becoming east 15 to
25 kt. waves 2 to 4 ft building to 4 to 6 ft occasionally to
8 ft. 
.saturday...southeast winds 10 to 20 kt. waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft. 
.saturday night...southeast winds 10 to 20 kt. chance of showers.
waves 2 to 4 ft. 
.sunday...south winds 10 to 20 kt. chance of showers. waves 2 to
4 ft. 
.monday...south winds 10 to 20 kt. chance of showers. waves 2 to
4 ft.  

$$

fzus63 kmkx 171937
glflm 
expires:202509180315;;149938

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
237 pm cdt wed sep 17 2025

for waters beyond five nautical miles of shore on lake michigan.

waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.

.synopsis...

low pressure around 29.4 inches will continue eastward across 
northern quebec canada today, with high pressure around 30.3 
inches moving into ontario through friday. 

winds remain nearly calm through tonight, with a light northeast
wind developing over the northern half of the lake in response to
a weak backdoor cold front. this front sags southward across the
rest of the lake thursday, bringing roughly 15 kt north to
northeast winds behind it. light northeast winds continue into
friday, becoming breezy and veering southeast friday night through
saturday morning as the aforementioned high pressure system
strengthens to around 30.4 inches and approaches southern
ontario/quebec and low pressure around 29.9 inches moves into the
dakotas / minnesota. there will be chances for thunderstorms
at times this weekend. 


lmz261-362-364-366-563-565-567-868-180315-
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-
237 pm cdt wed sep 17 2025

sheboygan wi to pentwater mi north...

.tonight...southwest winds 10 to 15 kt backing to northeast.
slight chance of showers and thunderstorms this evening, then
slight chance of showers overnight. waves 1 to 2 ft. 
.thursday...northeast winds 10 to 15 kt becoming north. waves
1 to 2 ft. 
.thursday night...northeast winds 10 to 15 kt. waves 1 to 3 ft. 
.friday...east winds 10 to 15 kt becoming northeast 10 to 20 kt.
waves 1 to 3 ft. 
.friday night...east winds 10 to 20 kt becoming southeast. waves
2 to 4 ft building to 3 to 5 ft. 
.saturday...southeast winds 10 to 20 kt. waves 3 to 5 ft. 
.saturday night...southeast winds 10 to 20 kt becoming south.
chance of showers. waves 2 to 4 ft. 
.sunday...south winds 10 to 20 kt. chance of showers. waves 2 to
4 ft. 
.monday...south winds 10 to 20 kt. chance of showers. waves 2 to
4 ft.  

$$

fzus63 kmqt 172001
glfls 
expires:202509180800;;150976

open lake forecast for lake superior
national weather service marquette mi
401 pm edt wed sep 17 2025

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

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

.synopsis...

a 30.3 inch high over manitoba gradually shifts over northern 
ontario tonight through friday and strengthens to 30.4 inches on 
saturday over eastern ontario and quebec. the 30.4 inch high will 
move to new england by sunday morning. this brings 30.2 inch ridging 
back over lake superior thursday and friday, weakening to 30.0 
inches by the end of the day saturday. troughing then begins to 
spread over lake superior sunday into the beginning of next week as 
low pressure deepens over the canadian prairie to around 29.5 inches.



lsz162-180800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt wed sep 17 2025 /301 pm cdt wed sep 17 2025/

.late this afternoon...west winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...northeast winds 5 to 15 knots becoming east 10 to
20 knots after midnight, then backing northeast late. a slight
chance of showers after midnight. waves building to 1 to 3 feet. 
.thursday...northeast winds 15 to 25 knots veering east in the
afternoon. a slight chance of showers. waves building to 3 to
6 feet occasionally to 8 feet. 
.thursday night...east winds 15 to 25 knots. a slight chance of
showers. a slight chance of thunderstorms after midnight. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.friday...east winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. a slight chance of thunderstorms through early
afternoon. a slight chance of showers. waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.friday night...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. a chance of showers. waves subsiding to
calm to 2 feet. 
.saturday...southeast winds 10 to 20 knots backing east by mid
afternoon. showers likely and a chance of thunderstorms. waves
calm to 2 feet. 
.saturday night...east winds 5 to 15 knots veering south after
midnight. a chance of showers and thunderstorms. waves calm to
2 feet. 
.sunday...south winds 5 to 15 knots veering southwest. a chance
of showers. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots becoming west 10 to 20 knots.
a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 172001
glfls 
expires:202509180800;;150977

open lake forecast for lake superior
national weather service marquette mi
401 pm edt wed sep 17 2025

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

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

.synopsis...

a 30.3 inch high over manitoba gradually shifts over northern 
ontario tonight through friday and strengthens to 30.4 inches on 
saturday over eastern ontario and quebec. the 30.4 inch high will 
move to new england by sunday morning. this brings 30.2 inch ridging 
back over lake superior thursday and friday, weakening to 30.0 
inches by the end of the day saturday. troughing then begins to 
spread over lake superior sunday into the beginning of next week as 
low pressure deepens over the canadian prairie to around 29.5 inches.



lsz263-180800-
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 pm edt wed sep 17 2025

.late this afternoon...west winds less than 10 knots. waves calm
to 2 feet. 
.tonight...northeast winds 5 to 15 knots increasing to 10 to
20 knots late. waves building to 1 to 3 feet. 
.thursday...northeast winds 10 to 20 knots veering east in the
afternoon. a slight chance of showers. waves building to 3 to
6 feet occasionally to 8 feet. 
.thursday night...east winds 10 to 20 knots. a slight chance of
showers. waves subsiding to 2 to 4 feet. 
.friday...east winds 15 to 25 knots. a slight chance of showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.friday night...east winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.saturday...southeast winds 5 to 15 knots. a chance of showers.
waves building to 1 to 3 feet. 
.saturday night...south winds 5 to 15 knots. a chance of showers
and thunderstorms. waves subsiding to calm to 2 feet. 
.sunday...south winds 5 to 15 knots. a chance of showers and
thunderstorms. waves calm to 2 feet. 
.monday...southwest winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 172001
glfls 
expires:202509180800;;150978

open lake forecast for lake superior
national weather service marquette mi
401 pm edt wed sep 17 2025

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

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

.synopsis...

a 30.3 inch high over manitoba gradually shifts over northern 
ontario tonight through friday and strengthens to 30.4 inches on 
saturday over eastern ontario and quebec. the 30.4 inch high will 
move to new england by sunday morning. this brings 30.2 inch ridging 
back over lake superior thursday and friday, weakening to 30.0 
inches by the end of the day saturday. troughing then begins to 
spread over lake superior sunday into the beginning of next week as 
low pressure deepens over the canadian prairie to around 29.5 inches.



lsz264-180800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 pm edt wed sep 17 2025

.late this afternoon...west winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...north winds 5 to 15 knots becoming northeast 10 to
20 knots late. waves building to 1 to 3 feet. 
.thursday...northeast winds 10 to 20 knots. waves 1 to 3 feet. 
.thursday night...northeast winds 5 to 15 knots veering east
after midnight. waves subsiding to calm to 2 feet, then building
to 2 to 4 feet. 
.friday...east winds 10 to 20 knots. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.friday night...east winds 10 to 20 knots veering southeast after
midnight. waves subsiding to calm to 2 feet. 
.saturday...southeast winds 10 to 20 knots. a chance of showers.
waves building to 2 to 4 feet. 
.saturday night...south winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. a chance of showers and thunderstorms.
waves subsiding to 1 to 3 feet. 
.sunday...south winds 5 to 15 knots. a chance of showers and
thunderstorms. waves subsiding to calm to 2 feet. 
.monday...south winds 5 to 15 knots veering southwest. waves calm
to 2 feet. 

$$

fzus63 kmqt 172001
glfls 
expires:202509180800;;150979

open lake forecast for lake superior
national weather service marquette mi
401 pm edt wed sep 17 2025

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

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

.synopsis...

a 30.3 inch high over manitoba gradually shifts over northern 
ontario tonight through friday and strengthens to 30.4 inches on 
saturday over eastern ontario and quebec. the 30.4 inch high will 
move to new england by sunday morning. this brings 30.2 inch ridging 
back over lake superior thursday and friday, weakening to 30.0 
inches by the end of the day saturday. troughing then begins to 
spread over lake superior sunday into the beginning of next week as 
low pressure deepens over the canadian prairie to around 29.5 inches.



lsz265-180800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 pm edt wed sep 17 2025

.late this afternoon...northeast winds 5 to 15 knots. waves calm
to 2 feet. 
.tonight...north winds 5 to 15 knots increasing to 10 to 20 knots
late. waves calm to 2 feet. 
.thursday...northeast winds 10 to 20 knots. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 
.thursday night...northeast winds 10 to 20 knots veering east
after midnight. a slight chance of showers through midnight.
waves building to 1 to 3 feet. 
.friday...east winds 10 to 20 knots. waves 1 to 3 feet. 
.friday night...east winds 10 to 20 knots veering southeast after
midnight. waves subsiding to calm to 2 feet. 
.saturday...southeast winds 15 to 25 knots. a chance of showers.
waves calm to 2 feet. 
.saturday night...southeast winds 15 to 25 knots becoming south
10 to 20 knots after midnight. a chance of showers through
midnight. a chance of thunderstorms. showers likely after
midnight. waves calm to 2 feet. 
.sunday...south winds 10 to 20 knots. a chance of showers and
thunderstorms. waves calm to 2 feet. 
.monday...south winds 10 to 20 knots veering southwest. a chance
of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 172001
glfls 
expires:202509180800;;150980

open lake forecast for lake superior
national weather service marquette mi
401 pm edt wed sep 17 2025

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

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

.synopsis...

a 30.3 inch high over manitoba gradually shifts over northern 
ontario tonight through friday and strengthens to 30.4 inches on 
saturday over eastern ontario and quebec. the 30.4 inch high will 
move to new england by sunday morning. this brings 30.2 inch ridging 
back over lake superior thursday and friday, weakening to 30.0 
inches by the end of the day saturday. troughing then begins to 
spread over lake superior sunday into the beginning of next week as 
low pressure deepens over the canadian prairie to around 29.5 inches.



lsz266-180800-
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 pm edt wed sep 17 2025

.late this afternoon...northwest winds 5 to 15 knots. areas of
dense fog. waves calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots veering north after
midnight, then increasing to 10 to 20 knots late. patchy fog.
waves building to 1 to 3 feet. 
.thursday...northeast winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 
.thursday night...northeast winds 10 to 20 knots veering east
after midnight. waves building to 1 to 3 feet. 
.friday...east winds 10 to 20 knots. waves 1 to 3 feet. 
.friday night...east winds 10 to 20 knots veering southeast after
midnight. waves subsiding to calm to 2 feet. 
.saturday...southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet. 
.saturday night...southeast winds 15 to 25 knots veering south
after midnight. a chance of showers through midnight. a chance of
thunderstorms. showers likely after midnight. waves subsiding to
1 to 3 feet. 
.sunday...south winds 10 to 20 knots. a chance of showers and
thunderstorms. waves subsiding to calm to 2 feet. 
.monday...south winds 10 to 20 knots. a chance of showers. waves
calm to 2 feet. 

$$

fzus63 kmqt 172001
glfls 
expires:202509180800;;150981

open lake forecast for lake superior
national weather service marquette mi
401 pm edt wed sep 17 2025

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

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

.synopsis...

a 30.3 inch high over manitoba gradually shifts over northern 
ontario tonight through friday and strengthens to 30.4 inches on 
saturday over eastern ontario and quebec. the 30.4 inch high will 
move to new england by sunday morning. this brings 30.2 inch ridging 
back over lake superior thursday and friday, weakening to 30.0 
inches by the end of the day saturday. troughing then begins to 
spread over lake superior sunday into the beginning of next week as 
low pressure deepens over the canadian prairie to around 29.5 inches.



lsz267-180800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 pm edt wed sep 17 2025

.late this afternoon...northwest winds 5 to 15 knots. areas of
dense fog. waves calm to 2 feet. 
.tonight...west winds 10 to 20 knots veering north late. areas of
dense fog through midnight, then patchy fog after midnight. waves
calm to 2 feet. 
.thursday...north winds 10 to 20 knots veering northeast in the
afternoon. patchy fog through early afternoon. waves calm to
2 feet. 
.thursday night...northeast winds 10 to 20 knots veering east
after midnight. waves building to 1 to 3 feet. 
.friday...east winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. waves subsiding to calm to 2 feet. 
.friday night...east winds 10 to 20 knots veering southeast after
midnight. waves calm to 2 feet. 
.saturday...southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. waves building to 1 to 3 feet. 
.saturday night...southeast winds 15 to 25 knots. a chance of
showers. a chance of thunderstorms after midnight. waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet. 
.sunday...south winds 10 to 20 knots. showers likely. waves
subsiding to calm to 2 feet. 
.monday...south winds 10 to 20 knots. a chance of showers. waves
calm to 2 feet. 

$$