fzus61 kbuf 172002
glflo 
expires:202608180300;;896971

open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt mon aug 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 ridge of high pressure averaging 30.0 inches will 
build over the lower great lakes tonight through tuesday, then drift 
to the eastern seaboard wednesday. a cold front will cross the lake 
wednesday before another 30.1 inch high builds into the great lakes 
thursday through friday.


loz062-180300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt mon aug 17 2026

.tonight...west winds 5 to 15 knots becoming north. waves 2 feet
or less. 
.tuesday...north winds 10 knots or less becoming southwest. waves
1 foot or less. 
.tuesday night...south winds 10 to 15 knots becoming southwest.
showers likely overnight. waves 2 feet or less. 
.wednesday...southwest winds 5 to 15 knots becoming west. showers
likely. waves 2 feet or less. 
.wednesday night...west winds 5 to 10 knots becoming northwest.
waves 2 feet or less. 
.thursday...northwest winds 10 knots or less becoming north.
waves 1 foot or less. 
.friday...northeast winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...south winds 5 to 10 knots becoming southwest. a
chance of showers during the day, then showers likely saturday
night. waves 2 feet or less. 

$$

fzus61 kbuf 172002
glflo 
expires:202608180300;;896972

open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt mon aug 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 ridge of high pressure averaging 30.0 inches will 
build over the lower great lakes tonight through tuesday, then drift 
to the eastern seaboard wednesday. a cold front will cross the lake 
wednesday before another 30.1 inch high builds into the great lakes 
thursday through friday.


loz063>065-180300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt mon aug 17 2026

.tonight...northwest winds 5 to 15 knots becoming north. waves
1 to 3 feet subsiding to 1 foot or less. 
.tuesday...north winds 10 knots or less becoming west. waves
1 foot or less. 
.tuesday night...west winds 5 to 15 knots becoming southwest. a
chance of showers overnight. waves 2 feet or less. 
.wednesday...southwest winds 10 to 15 knots becoming west.
showers likely in the morning, then showers likely with a chance
of thunderstorms in the afternoon. waves 1 to 3 feet. 
.wednesday night...west winds 5 to 15 knots becoming northwest. a
chance of showers in the evening. waves 1 to 3 feet. 
.thursday...northwest winds 5 to 10 knots. waves 2 feet or less. 
.friday...northwest winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.saturday...south winds 5 to 15 knots. a chance of showers during
the day, then showers likely saturday night. waves 2 feet or
less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 171953
glfle 
expires:202608180215;;896582

open lake forecast for lake erie
national weather service cleveland oh
353 pm edt mon aug 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...
high pressure 30.00 inches will move south of lake erie on 
tuesday. a cold front will move south across the lake on 
wednesday. high pressure 30.20 inches will build over the lake on
thursday and friday.


lez165>167-180215-
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-
353 pm edt mon aug 17 2026

.tonight...north winds 5 to 15 knots. waves 1 to 3 feet. 
.tuesday...northwest winds 10 knots or less becoming west. waves
1 foot or less. 
.tuesday night...southwest winds 10 to 15 knots increasing to
15 to 20 knots. a chance of showers overnight. waves 1 to 3 feet
building to 2 to 4 feet. 
.wednesday...west winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers. waves 2 to 4 feet subsiding to
1 to 3 feet. 
.wednesday night...northwest winds 5 to 10 knots becoming
northeast. a chance of showers and thunderstorms in the evening.
waves 2 feet or less. 
.thursday...east winds 5 to 10 knots. waves 1 foot or less. 
.friday...east winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...southwest winds 5 to 15 knots becoming west. a chance
of showers during the day, then showers likely saturday night.
waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 171953
glfle 
expires:202608180215;;896581

open lake forecast for lake erie
national weather service cleveland oh
353 pm edt mon aug 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...
high pressure 30.00 inches will move south of lake erie on 
tuesday. a cold front will move south across the lake on 
wednesday. high pressure 30.20 inches will build over the lake on
thursday and friday.


lez162>164-180215-
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-
the islands to vermilion oh beyond 5 nm off shoreline to us-
canadian border-
353 pm edt mon aug 17 2026

.tonight...northeast winds 10 knots or less. waves 2 feet or
less. 
.tuesday...west winds 10 knots or less becoming southwest. waves
1 foot or less. 
.tuesday night...southwest winds 5 to 15 knots. a chance of
showers overnight. waves 2 feet or less. 
.wednesday...west winds 5 to 15 knots. a chance of showers. waves
2 feet or less. 
.wednesday night...northwest winds 5 to 10 knots becoming east. a
chance of showers in the evening. waves 1 foot or less. 
.thursday...northeast winds 5 to 10 knots becoming east. waves
1 foot or less. 
.friday...east winds 10 knots or less becoming southwest. waves
1 foot or less. 
.saturday...southwest winds 5 to 15 knots becoming northwest. a
chance of showers and thunderstorms during the day, then a chance
of showers saturday night. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 171953
glfle 
expires:202608180215;;896583

open lake forecast for lake erie
national weather service cleveland oh
353 pm edt mon aug 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...
high pressure 30.00 inches will move south of lake erie on 
tuesday. a cold front will move south across the lake on 
wednesday. high pressure 30.20 inches will build over the lake on
thursday and friday.


lez061-168-169-180215-
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-
353 pm edt mon aug 17 2026

.tonight...northwest winds 5 to 15 knots becoming northeast.
waves 2 feet or less. 
.tuesday...north winds 10 knots or less becoming west. waves
1 foot or less. 
.tuesday night...southwest winds 10 to 15 knots. a chance of
showers overnight. waves 1 to 3 feet building to 2 to 4 feet. 
.wednesday...southwest winds 10 to 15 knots becoming west.
showers likely in the morning, then a chance of showers and
thunderstorms in the afternoon. waves 2 to 4 feet. 
.wednesday night...west winds 5 to 10 knots becoming northeast. a
chance of showers and thunderstorms in the evening. waves 1 to
2 feet. 
.thursday...northeast winds 10 knots or less becoming east. waves
1 foot or less. 
.friday...east winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...southwest winds 5 to 15 knots. a chance of showers
during the day, then showers likely saturday night. waves 2 feet
or less. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 171935
glfsc 
expires:202608180345;;896131

lake st clair forecast
national weather service detroit/pontiac mi
335 pm edt mon aug 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...diffuse area of high pressure, 30.00 inches, will hold
across the great lakes through tomorrow morning. a cold front
will then push across the region tomorrow afternoon through
tomorrow evening. this will bring showers and thunderstorms and
will veer winds from southwest to northwest in the wake of the
front.


lcz460-180345-
lake st clair-
335 pm edt mon aug 17 2026

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

$$

fzus63 kdtx 171934
glflh 
expires:202608180345;;896129

open lake forecast for lake huron
national weather service detroit/pontiac mi
334 pm edt mon aug 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...diffuse area of high pressure, 30.00 inches, will hold
across the great lakes through tomorrow morning. a cold front
will then push across the region tomorrow afternoon through
tomorrow evening. this will bring showers and thunderstorms and
will veer winds from southwest to northwest in the wake of the
front.


lhz462>464-180345-
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-
334 pm edt mon aug 17 2026

.tonight...north winds 5 to 10 knots early in the evening
becoming light and variable. waves 2 feet or less. 
.tuesday...southwest winds 5 to 10 knots backing to the south
late in the afternoon. waves 2 feet or less. 
.tuesday night...south winds 5 to 10 knots becoming west 10 to
15 knots after midnight. a chance of showers and thunderstorms in
the evening...then showers likely after midnight. waves 1 to
3 feet. 
.wednesday...northwest winds 10 to 15 knots becoming north 5 to
10 knots in the late morning and afternoon. a chance of showers
in the morning. waves 1 to 3 feet. 
.wednesday night...light and variable winds becoming east 5 to
10 knots after midnight. waves 2 feet or less. 
.thursday...east winds 5 to 10 knots backing to the north late in
the morning...then veering to the east late in the evening. waves
2 feet or less. 
.friday...south winds 5 to 10 knots increasing to 10 to 15 knots
by midnight. a chance of showers by midnight. waves 2 feet or
less. 
.saturday...southwest winds 5 to 10 knots becoming west 10 to
15 knots by midnight. a chance of showers early in the morning.
rain showers likely until early evening...then a chance of
showers by midnight. waves 2 feet or less. 


$$

fzus63 kdtx 171934
glflh 
expires:202608180345;;896127

open lake forecast for lake huron
national weather service detroit/pontiac mi
334 pm edt mon aug 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...diffuse area of high pressure, 30.00 inches, will hold
across the great lakes through tomorrow morning. a cold front
will then push across the region tomorrow afternoon through
tomorrow evening. this will bring showers and thunderstorms and
will veer winds from southwest to northwest in the wake of the
front.


lhz361-180345-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
334 pm edt mon aug 17 2026

.tonight...west winds 5 to 10 knots early in the evening becoming
light and variable...then becoming southwest 5 to 10 knots after
midnight. waves 2 feet or less. 
.tuesday...southwest winds 10 to 15 knots veering to the west
late in the afternoon. a chance of showers and thunderstorms in
the afternoon. waves 1 to 3 feet. 
.tuesday night...northwest winds 10 to 15 knots decreasing to
5 to 10 knots after midnight. a chance of showers and
thunderstorms in the evening...then a chance of showers after
midnight. waves 1 to 3 feet. 
.wednesday...northwest winds 5 to 10 knots becoming west 10 to
15 knots early in the afternoon. waves 2 feet or less. 
.wednesday night...west winds 10 to 15 knots becoming northwest
5 to 10 knots in the late evening and overnight. waves 1 to
3 feet. 
.thursday...northwest winds 5 to 10 knots in the morning becoming
light and variable...then becoming southwest 5 to 10 knots late
in the afternoon backing to the south. waves 2 feet or less. 
.friday...south winds 5 to 10 knots. a chance of showers in the
late morning and early afternoon. rain showers likely early in
the evening...then a chance of showers by midnight. waves 2 feet
or less. 
.saturday...southwest winds 5 to 10 knots becoming north 10 to
15 knots . a chance of showers. a chance of thunderstorms early
in the evening. waves 1 to 3 feet. 


$$

fzus63 kdtx 171934
glflh 
expires:202608180345;;896128

open lake forecast for lake huron
national weather service detroit/pontiac mi
334 pm edt mon aug 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...diffuse area of high pressure, 30.00 inches, will hold
across the great lakes through tomorrow morning. a cold front
will then push across the region tomorrow afternoon through
tomorrow evening. this will bring showers and thunderstorms and
will veer winds from southwest to northwest in the wake of the
front.


lhz362-363-180345-
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-
334 pm edt mon aug 17 2026

.tonight...light and variable winds becoming southwest 5 to
10 knots early in the morning. waves 2 feet or less. 
.tuesday...southwest winds 5 to 10 knots becoming south 10 to
15 knots in the late morning and afternoon. a chance of showers
and thunderstorms in the afternoon. waves 1 to 3 feet. 
.tuesday night...north winds 5 to 10 knots backing to the west by
midnight...then becoming northwest 10 to 15 knots after midnight.
a chance of showers and thunderstorms in the evening...then a
chance of showers after midnight. waves 1 to 3 feet. 
.wednesday...north winds 5 to 10 knots veering to the northeast
early in the afternoon. waves 1 to 3 feet. 
.wednesday night...north winds 5 to 10 knots backing to the
northwest after midnight. waves 1 to 3 feet. 
.thursday...northwest winds 5 to 10 knots in the morning becoming
light and variable...then becoming north 5 to 10 knots late in
the afternoon veering to the southeast. waves 2 feet or less. 
.friday...south winds 5 to 10 knots increasing to 10 to 15 knots.
a chance of showers . waves 1 to 3 feet. 
.saturday...southwest winds 10 to 15 knots decreasing to 5 to
10 knots in the late morning and early afternoon...then veering
to the southwest 5 to 10 knots early in the evening increasing to
10 to 15 knots by midnight. a chance of showers. waves 1 to
3 feet building to 2 to 4 feet by midnight. 


$$

fzus63 kmkx 171926
glflm 
expires:202608180315;;895976

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
226 pm cdt mon aug 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...

30.1 inch low pressure is approaching lake michigan this 
afternoon, bringing light to variable winds to the open waters. 
the lighter winds will continue into this evening as the high 
continues east. a slow-moving cold front will approach from the 
northern great plains tuesday into wednesday, bringing increasing 
southwest winds and chances for thunderstorms. tuesday evening and
night appears most favored for storm potential, with storm 
chances expected to move well south of the waters on wednesday. an
isolated stronger storm with gusty winds and hail cant be ruled 
out in this activity, though widespread severe weather potential 
appears low at this time. will continue to monitor trends through 
tomorrow. 30.0 inch high pressure will move through the western 
great lakes wednesday through thursday, with light and variable 
winds prevailing across the waters. the next thunderstorm chances 
arrive friday afternoon and evening, when the next cold front is 
expected to move across lake michigan.


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-
226 pm cdt mon aug 17 2026

sheboygan wi to pentwater mi north...

.tonight...south winds 10 to 20 kt becoming southwest. waves 1 to
3 ft. 
.tuesday...southwest winds 10 to 20 kt. slight chance of showers
and thunderstorms in the morning, then chance of showers and
thunderstorms in the afternoon. waves 2 to 4 ft. 
.tuesday night...northwest winds 10 to 20 kt becoming north 10 to
15 kt. chance of showers and thunderstorms in the evening. waves
2 to 4 ft subsiding to 1 to 3 ft. 
.wednesday...northwest winds 10 to 15 kt increasing to 10 to
20 kt. waves 1 to 2 ft. 
.wednesday night...east winds 10 to 15 kt becoming northeast.
waves 1 to 2 ft. 
.thursday...northeast winds 5 to 10 kt veering to southeast 10 to
20 kt in the afternoon. waves 1 ft or less. 
.thursday night...south winds 10 to 20 kt increasing to 15 to
25 kt. waves 1 to 2 ft. 
.friday...southwest winds to 30 kt. chance of showers. waves 2 to
4 ft. 
.saturday...northwest winds 15 to 25 kt becoming north to 30 kt.
chance of showers. waves 2 to 4 ft.  

$$

fzus63 kmkx 171926
glflm 
expires:202608180315;;895977

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
226 pm cdt mon aug 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...

30.1 inch low pressure is approaching lake michigan this 
afternoon, bringing light to variable winds to the open waters. 
the lighter winds will continue into this evening as the high 
continues east. a slow-moving cold front will approach from the 
northern great plains tuesday into wednesday, bringing increasing 
southwest winds and chances for thunderstorms. tuesday evening and
night appears most favored for storm potential, with storm 
chances expected to move well south of the waters on wednesday. an
isolated stronger storm with gusty winds and hail cant be ruled 
out in this activity, though widespread severe weather potential 
appears low at this time. will continue to monitor trends through 
tomorrow. 30.0 inch high pressure will move through the western 
great lakes wednesday through thursday, with light and variable 
winds prevailing across the waters. the next thunderstorm chances 
arrive friday afternoon and evening, when the next cold front is 
expected to move across lake michigan.


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-
226 pm cdt mon aug 17 2026

sheboygan wi to pentwater mi south...

.tonight...southwest winds 10 to 15 kt becoming west 10 to 20 kt.
waves 2 to 4 ft. 
.tuesday...west winds 10 to 20 kt becoming southwest. chance of
showers and slight chance of thunderstorms in the afternoon.
waves 2 to 4 ft. 
.tuesday night...southwest winds 10 to 20 kt veering to northwest
10 to 15 kt. chance of showers and thunderstorms in the evening.
waves 2 to 4 ft. 
.wednesday...north winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 3 ft. 
.wednesday night...northeast winds 10 to 20 kt diminishing to
5 to 10 kt overnight. waves 1 to 2 ft. 
.thursday...northeast winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 to 2 ft. 
.thursday night...southeast winds 10 to 20 kt becoming south.
waves 1 to 2 ft. 
.friday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 2 ft building to 2 to 4 ft. 
.saturday...west winds 15 to 25 kt becoming northwest. waves 2 to
4 ft.  

$$

fzus63 kmqt 172001
glfls 
expires:202608180800;;896915

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon aug 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...

a 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior tonight through tuesday 
afternoon, then weak 29.9 inch ridging returns to lake superior 
tuesday night. a 30.0 inch high pressure settles over the northern 
plains tuesday afternoon and night, eventually moving over lake 
superior wednesday evening before expanding to cover much of the 
great lakes by thursday afternoon. friday into the weekend, a low 
pressure of around 29.8 inches transits across northern ontario 
quickly followed by 30.2 inch ridging for the latter part of the 
weekend into next week.




lsz162-180800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt mon aug 17 2026 /301 pm cdt mon aug 17 2026/

.late this afternoon...southwest winds 10 to 20 knots. waves 1 to
3 feet. 
.tonight...southwest winds 10 to 20 knots veering west after
midnight. a chance of showers and a slight chance of
thunderstorms through midnight. waves subsiding to calm to
2 feet. 
.tuesday...northwest winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. waves building to 1 to 3 feet. 
.tuesday night...west winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming north
less than 10 knots after midnight. waves calm to 2 feet. 
.thursday...southeast winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots backing north
after midnight. a chance of showers. waves calm to 2 feet. 
.friday...west winds 5 to 15 knots becoming northwest 10 to
20 knots. waves calm to 2 feet. 
.saturday...north winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 172001
glfls 
expires:202608180800;;896916

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon aug 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...

a 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior tonight through tuesday 
afternoon, then weak 29.9 inch ridging returns to lake superior 
tuesday night. a 30.0 inch high pressure settles over the northern 
plains tuesday afternoon and night, eventually moving over lake 
superior wednesday evening before expanding to cover much of the 
great lakes by thursday afternoon. friday into the weekend, a low 
pressure of around 29.8 inches transits across northern ontario 
quickly followed by 30.2 inch ridging for the latter part of the 
weekend into next week.




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 mon aug 17 2026

.late this afternoon...southwest winds 15 to 25 knots. waves 2 to
4 feet. 
.tonight...southwest winds 15 to 25 knots becoming west 10 to
20 knots after midnight. a slight chance of thunderstorms through
midnight. a chance of showers. waves subsiding to 1 to 3 feet. 
.tuesday...northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon, then becoming southwest 10 to 20 knots
late. waves subsiding to calm to 2 feet, then building to 1 to
3 feet. 
.tuesday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering northwest late. waves
subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing southwest by
mid afternoon. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming south
less than 10 knots after midnight. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots. waves calm to 2 feet. 
.thursday night...south winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 
.friday...west winds 10 to 20 knots veering north. waves calm to
2 feet. 
.saturday...north winds 10 to 20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 172001
glfls 
expires:202608180800;;896917

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon aug 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...

a 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior tonight through tuesday 
afternoon, then weak 29.9 inch ridging returns to lake superior 
tuesday night. a 30.0 inch high pressure settles over the northern 
plains tuesday afternoon and night, eventually moving over lake 
superior wednesday evening before expanding to cover much of the 
great lakes by thursday afternoon. friday into the weekend, a low 
pressure of around 29.8 inches transits across northern ontario 
quickly followed by 30.2 inch ridging for the latter part of the 
weekend into next week.




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 mon aug 17 2026

.late this afternoon...southwest winds 10 to 20 knots. waves calm
to 2 feet building to 1 to 3 feet. 
.tonight...southwest winds 10 to 20 knots veering west late. a
slight chance of thunderstorms through midnight. a slight chance
of showers. waves building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.tuesday...northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon, then becoming southwest 10 to 20 knots
late. waves subsiding to calm to 2 feet, then building to 1 to
3 feet. 
.tuesday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering northwest late. waves
building to 2 to 4 feet, then subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing west by mid
afternoon. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots diminishing to
less than 10 knots after midnight. waves calm to 2 feet. 
.thursday...south winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.thursday night...south winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 
.friday...southwest winds 10 to 20 knots becoming north 5 to
15 knots. a chance of showers. waves calm to 2 feet. 
.saturday...north winds 10 to 20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 172001
glfls 
expires:202608180800;;896918

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon aug 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...

a 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior tonight through tuesday 
afternoon, then weak 29.9 inch ridging returns to lake superior 
tuesday night. a 30.0 inch high pressure settles over the northern 
plains tuesday afternoon and night, eventually moving over lake 
superior wednesday evening before expanding to cover much of the 
great lakes by thursday afternoon. friday into the weekend, a low 
pressure of around 29.8 inches transits across northern ontario 
quickly followed by 30.2 inch ridging for the latter part of the 
weekend into next week.




lsz265-180800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 pm edt mon aug 17 2026

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

$$

fzus63 kmqt 172001
glfls 
expires:202608180800;;896919

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon aug 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...

a 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior tonight through tuesday 
afternoon, then weak 29.9 inch ridging returns to lake superior 
tuesday night. a 30.0 inch high pressure settles over the northern 
plains tuesday afternoon and night, eventually moving over lake 
superior wednesday evening before expanding to cover much of the 
great lakes by thursday afternoon. friday into the weekend, a low 
pressure of around 29.8 inches transits across northern ontario 
quickly followed by 30.2 inch ridging for the latter part of the 
weekend into next week.




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 mon aug 17 2026

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

$$

fzus63 kmqt 172001
glfls 
expires:202608180800;;896920

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon aug 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...

a 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior tonight through tuesday 
afternoon, then weak 29.9 inch ridging returns to lake superior 
tuesday night. a 30.0 inch high pressure settles over the northern 
plains tuesday afternoon and night, eventually moving over lake 
superior wednesday evening before expanding to cover much of the 
great lakes by thursday afternoon. friday into the weekend, a low 
pressure of around 29.8 inches transits across northern ontario 
quickly followed by 30.2 inch ridging for the latter part of the 
weekend into next week.




lsz267-180800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 pm edt mon aug 17 2026

.late this afternoon...west winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...south winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then veering southwest late. a chance of showers
after midnight. waves building to 1 to 3 feet. 
.tuesday...west winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon, then diminishing to 10 to 20 knots late. a
slight chance of showers through early afternoon. waves 1 to
3 feet. 
.tuesday night...west winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 
.wednesday...northwest winds 10 to 20 knots. waves calm to
2 feet. 
.wednesday night...northwest winds 5 to 15 knots backing west
after midnight. waves calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. a chance of showers. waves calm to
2 feet. 
.friday...south winds 10 to 20 knots veering southwest. showers
likely. a chance of showers. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.saturday...north winds 15 to 25 knots. waves building to 3 to
5 feet occasionally to 7 feet. 

$$