fzus61 kbuf 040202
glflo 
expires:202609040900;;864215

open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu sep 3 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 secondary cold front near lake ontario will slowly push southward 
overnight. following the frontal passage, a 30.1 inch high will 
gradually settle southward from northern ontario friday through 
monday. another cold front will then cross the lake monday night, 
with another 30.1 inch high then forecast to build south from near 
james bay on tuesday.


loz062-040900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt thu sep 3 2026

.overnight...northwest winds less than 10 knots. waves
1 foot or less. 
.friday...northwest winds 10 knots or less becoming west. waves
1 foot or less. 
.friday night...west winds 5 to 10 knots becoming north. waves
1 foot or less. 
.saturday...north winds 10 knots or less. waves 1 foot or less. 
.saturday night...north winds 10 knots or less becoming
northeast. waves 2 feet or less. 
.sunday...northeast winds 10 to 15 knots becoming light and
variable. waves 2 feet or less. 
.monday...light and variable winds. waves 1 foot or less. 
.tuesday...northeast winds 10 knots or less becoming southeast
10 to 15 knots. a chance of showers tuesday night. waves 2 feet
or less. 

$$

fzus61 kbuf 040202
glflo 
expires:202609040900;;864216

open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu sep 3 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 secondary cold front near lake ontario will slowly push southward 
overnight. following the frontal passage, a 30.1 inch high will 
gradually settle southward from northern ontario friday through 
monday. another cold front will then cross the lake monday night, 
with another 30.1 inch high then forecast to build south from near 
james bay on tuesday.


loz063>065-040900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt thu sep 3 2026

.overnight...west winds 10 knots or less becoming
northwest. waves 1 foot or less. 
.friday...northwest winds 10 knots or less becoming west. waves
1 foot or less. 
.friday night...west winds 5 to 10 knots becoming north. waves
2 feet or less. 
.saturday...north winds 5 to 10 knots. waves 2 feet or less. 
.saturday night...north winds 10 to 15 knots becoming northeast.
waves 2 feet or less. 
.sunday...northeast winds 5 to 15 knots diminishing to less than
10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.monday...west winds 10 knots or less becoming southwest. waves
1 foot or less. 
.tuesday...northwest winds 5 to 15 knots becoming southeast.
waves 1 foot or less. 

$$

fzus61 kcle 040125
glfle 
expires:202609040815;;863271

open lake forecast for lake erie
national weather service cleveland oh
925 pm edt thu sep 3 2026

for waters beyond five nautical miles of shore on lake erie

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

.synopsis...
a frontal boundary located near lake erie will settle to the south 
tonight, then push towards the ohio valley through saturday. a 
ridge averaging 30.00 inches will build from the great lakes into 
northern ohio this weekend and into early next week.


lez162-163-040815-
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-
925 pm edt thu sep 3 2026

.rest of tonight...south winds 5 to 10 knots becoming west. a
chance of showers and thunderstorms, then showers likely with a
chance of thunderstorms late. some thunderstorms may produce
damaging winds and large hail late this evening. waves 1 foot or
less. 
.friday...west winds 10 knots or less becoming northwest. showers
likely with a slight chance of thunderstorms early, then a chance
of showers with a slight chance of thunderstorms. a slight chance
of showers and thunderstorms late. waves 1 foot or less. 
.friday night...northeast winds 5 to 10 knots. a chance of
showers. waves 1 foot or less. 
.saturday...northeast winds 10 to 15 knots. a chance of showers
in the morning. waves 1 to 3 feet. 
.saturday night...northeast winds 10 to 15 knots. waves 1 to
3 feet. 
.sunday...northeast winds 10 to 15 knots becoming east. waves
1 to 3 feet. 
.monday...east winds 5 to 10 knots becoming southeast. waves
2 feet or less. 
.tuesday...southeast winds 5 to 15 knots becoming south. a chance
of showers tuesday night. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 040125
glfle 
expires:202609040815;;863273

open lake forecast for lake erie
national weather service cleveland oh
925 pm edt thu sep 3 2026

for waters beyond five nautical miles of shore on lake erie

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

.synopsis...
a frontal boundary located near lake erie will settle to the south 
tonight, then push towards the ohio valley through saturday. a 
ridge averaging 30.00 inches will build from the great lakes into 
northern ohio this weekend and into early next week.


lez061-168-169-040815-
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-
925 pm edt thu sep 3 2026

.rest of tonight...west winds 10 knots or less. thunderstorms
likely with a chance of showers late this evening, then a chance
of showers and thunderstorms after midnight. some thunderstorms
may produce damaging winds and large hail late this evening.
waves around 1 foot. 
.friday...northwest winds 10 knots or less. a chance of showers
with a slight chance of thunderstorms through early afternoon,
then a chance of showers late. waves 1 foot or less. 
.friday night...northwest winds 10 knots or less becoming
northeast. waves 1 foot or less. 
.saturday...northeast winds 10 to 15 knots. waves 2 feet or less.
.saturday night...northeast winds 5 to 15 knots becoming east.
waves 2 feet or less. 
.sunday...northeast winds 5 to 15 knots becoming east. waves
2 feet or less. 
.monday...east winds 10 knots or less becoming southeast. waves
1 foot or less. 
.tuesday...southeast winds 10 knots or less becoming south and
increasing to 15 to 20 knots. a chance of showers tuesday night.
waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 040125
glfle 
expires:202609040815;;863272

open lake forecast for lake erie
national weather service cleveland oh
925 pm edt thu sep 3 2026

for waters beyond five nautical miles of shore on lake erie

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

.synopsis...
a frontal boundary located near lake erie will settle to the south 
tonight, then push towards the ohio valley through saturday. a 
ridge averaging 30.00 inches will build from the great lakes into 
northern ohio this weekend and into early next week.


lez164>167-040815-
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-
925 pm edt thu sep 3 2026

.rest of tonight...southwest winds 5 to 10 knots becoming west.
showers and thunderstorms likely late this evening, then a chance
of showers and thunderstorms after midnight. showers likely with
a chance of thunderstorms late. some thunderstorms may produce
damaging winds and large hail late this evening. waves 1 foot or
less. 
.friday...west winds 10 knots or less becoming northwest. showers
likely with a slight chance of thunderstorms early, then a chance
of showers with a slight chance of thunderstorms. a slight chance
of showers and thunderstorms late. waves 1 foot or less. 
.friday night...northwest winds 5 to 10 knots becoming northeast.
a chance of showers. waves 1 foot or less. 
.saturday...northeast winds 10 to 15 knots. waves 1 to 3 feet. 
.saturday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.sunday...northeast winds 15 to 20 knots becoming east 10 to
15 knots. waves 1 to 3 feet. 
.monday...east winds 5 to 15 knots becoming southeast. waves
2 feet or less. 
.tuesday...southeast winds 5 to 15 knots becoming south 15 to
20 knots. a chance of showers tuesday night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 040152
glfsc 
expires:202609041000;;863943

lake st clair forecast
national weather service detroit/pontiac mi
952 pm edt thu sep 3 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...a stalled frontal boundary remains draped across the
southern great lakes tonight. additional rounds of storms follow
along and north of the front late tonight and friday until the
front dislodges southward friday night. dry weather is then
forecast for saturday and sunday.


lcz460-041000-
lake st clair-
952 pm edt thu sep 3 2026

.rest of tonight...light and variable winds. mostly cloudy. patchy
fog after midnight. a chance of showers early in the morning. waves
2 feet or less.
.friday...light and variable winds becoming northeast 5 to 10 knots
late in the afternoon. mostly cloudy. areas of fog in the morning.
patchy fog early in the afternoon. a chance of showers early in the
morning. showers likely late in the morning...then a chance of
showers early in the afternoon. waves nearly calm.
.friday night...northeast winds 5 to 10 knots. partly cloudy ...
then mostly cloudy with a chance of light showers after midnight.
waves 2 feet or less.
.saturday...northeast winds 5 to 10 knots increasing to 10 to 15
knots early in the afternoon. mostly cloudy early in the morning
then clearing. a chance of light showers early in the morning. waves
2 feet or less.
.saturday night...northeast winds 10 to 15 knots diminishing to 5 to
10 knots after midnight. clear. waves 2 feet or less.
.sunday...northeast winds 5 to 10 knots. sunny in the morning
becoming mostly clear. waves 2 feet or less.
.monday...east winds 5 to 10 knots. mostly clear. waves 2 feet or
less.
.tuesday...southeast winds 10 to 15 knots. partly cloudy. waves 2
feet or less.

$$

fzus63 kdtx 040150
glflh 
expires:202609041000;;863937

open lake forecast for lake huron
national weather service detroit/pontiac mi
950 pm edt thu sep 3 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...a stalled frontal boundary remains draped across the
southern great lakes tonight. additional rounds of storms follow
along and north of the front late tonight and friday until the 
front dislodges southward friday night. dry weather is then 
forecast for saturday and sunday.


lhz463-464-041000-
lake huron from harbor beach to port sanilac beyond 5nm off shore-
lake huron from port sanilac to port huron beyond 5nm off shore-
950 pm edt thu sep 3 2026

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


$$

fzus63 kdtx 040150
glflh 
expires:202609041000;;863936

open lake forecast for lake huron
national weather service detroit/pontiac mi
950 pm edt thu sep 3 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...a stalled frontal boundary remains draped across the
southern great lakes tonight. additional rounds of storms follow
along and north of the front late tonight and friday until the 
front dislodges southward friday night. dry weather is then 
forecast for saturday and sunday.


lhz363-462-041000-
lake huron from sturgeon point to alabaster mi beyond 5nm off
shore-
lake huron from port austin to harbor beach beyond 5nm off shore-
950 pm edt thu sep 3 2026

.rest of tonight...light and variable winds. waves 2 feet or
less. 
.friday...light and variable winds. a chance of showers. waves
2 feet or less. 
.friday night...northeast winds 5 to 10 knots. waves 2 feet or
less. 
.saturday...northeast winds 5 to 10 knots. waves 2 feet or less. 
.saturday night...northeast winds 5 to 10 knots. waves 2 feet or
less. 
.sunday...northeast winds 5 to 10 knots in the morning becoming
light and variable. waves 2 feet or less. 
.monday...light and variable winds becoming southeast 5 to
10 knots by midnight. waves 2 feet or less. 
.tuesday...southeast winds 5 to 10 knots increasing to 10 to
15 knots . a chance of showers . waves 1 to 3 feet building to
2 to 4 feet by midnight. 


$$

fzus63 kdtx 040150
glflh 
expires:202609041000;;863935

open lake forecast for lake huron
national weather service detroit/pontiac mi
950 pm edt thu sep 3 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...a stalled frontal boundary remains draped across the
southern great lakes tonight. additional rounds of storms follow
along and north of the front late tonight and friday until the 
front dislodges southward friday night. dry weather is then 
forecast for saturday and sunday.


lhz361-362-041000-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
lake huron from presque isle light to sturgeon point mi beyond
5nm off shore-
950 pm edt thu sep 3 2026

.rest of tonight...light and variable winds. waves 2 feet or
less. 
.friday...light and variable winds becoming northeast 5 to
10 knots late in the morning...then becoming light and variable
in the afternoon. patchy fog in the morning. a chance of showers.
waves 2 feet or less. 
.friday night...light and variable winds becoming northeast 5 to
10 knots after midnight. waves 2 feet or less. 
.saturday...northeast winds 5 to 10 knots until late afternoon
becoming light and variable. waves 2 feet or less. 
.saturday night...light and variable winds. waves 2 feet or less.
.sunday...light and variable winds. waves 2 feet or less. 
.monday...light and variable winds becoming east 5 to 10 knots .
waves 2 feet or less. 
.tuesday...southeast winds 5 to 10 knots increasing to 10 to
15 knots. a chance of showers...then showers likely by midnight.
waves 1 to 3 feet building to 2 to 4 feet . 


$$

fzus63 kmkx 040213
glflm 
expires:202609040915;;864910

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
913 pm cdt thu sep 3 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...

no major changes to the synopsis this evening as the overall
pattern and forecast remains largely unchanged. some marine dense
fog may form tonight, mainly over the middle third of the lake,
close to a stalled frontal boundary.

otherwise, the frontal boundary will remain across the great 
lakes region through friday. as this frontal boundary waffles 
north to south across the lake from day to day, generally east to 
northeast winds are expected north of the front, with east to 
southeast winds south of the front. on and off thunderstorms will 
be possible along and north of this frontal boundary through at 
least friday night. then high pressure around 30.1 inches builds 
over hudson bay on saturday, while low pressure around 29.6 inches
moves into the northern great plains. similar to earlier week 
storms, widespread severe weather is not anticipated, though 
isolated stronger storms with hail and gusty winds are possible.


lmz261-362-364-366-563-565-567-868-040915-
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-
913 pm cdt thu sep 3 2026

sheboygan wi to pentwater mi north...

.rest of tonight...east winds 5 to 10 kt increasing to 10 to
15 kt. slight chance of showers and thunderstorms late this
evening, then chance of showers and thunderstorms overnight.
patchy fog overnight. waves 1 to 2 ft. 
.friday...southeast winds 10 to 15 kt becoming east 10 to 20 kt.
patchy fog in the morning. chance of showers and slight chance of
thunderstorms in the morning. waves 1 to 2 ft. 
.friday night...northeast winds 10 to 15 kt becoming east 5 to
10 kt. patchy fog overnight. waves 1 to 2 ft. 
.saturday...east winds 10 to 15 kt becoming northeast. waves 1 to
2 ft. 
.saturday night...northeast winds 10 to 15 kt becoming southeast.
waves 1 to 2 ft. 
.sunday...southeast winds 10 to 15 kt becoming south. waves 1 to
2 ft. 
.sunday night...east winds 5 to 10 kt becoming southeast. waves
1 to 2 ft. 
.monday...south winds 10 to 15 kt. waves 1 to 3 ft. 
.tuesday...south winds to 30 kt. chance of showers. waves 5 to
8 ft occasionally to 10 ft.  

$$

fzus63 kmkx 040213
glflm 
expires:202609040915;;864911

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
913 pm cdt thu sep 3 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...

no major changes to the synopsis this evening as the overall
pattern and forecast remains largely unchanged. some marine dense
fog may form tonight, mainly over the middle third of the lake,
close to a stalled frontal boundary.

otherwise, the frontal boundary will remain across the great 
lakes region through friday. as this frontal boundary waffles 
north to south across the lake from day to day, generally east to 
northeast winds are expected north of the front, with east to 
southeast winds south of the front. on and off thunderstorms will 
be possible along and north of this frontal boundary through at 
least friday night. then high pressure around 30.1 inches builds 
over hudson bay on saturday, while low pressure around 29.6 inches
moves into the northern great plains. similar to earlier week 
storms, widespread severe weather is not anticipated, though 
isolated stronger storms with hail and gusty winds are possible.


lmz080-669-671-673-675-777-779-870-872-874-876-878-040915-
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-
913 pm cdt thu sep 3 2026

sheboygan wi to pentwater mi south...

.rest of tonight...southeast winds 10 to 15 kt. slight chance of
showers and thunderstorms late this evening, then chance of
showers and thunderstorms overnight. patchy fog overnight. waves
1 to 2 ft. 
.friday...east winds 10 to 20 kt becoming southeast late in the
morning, then becoming south 10 to 15 kt early in the afternoon
becoming southeast 5 to 10 kt late. chance of showers and slight
chance of thunderstorms in the morning. waves 1 to 3 ft. 
.friday night...east winds 5 to 10 kt becoming northeast. chance
of showers and thunderstorms. waves 1 to 2 ft. 
.saturday...east winds 10 to 15 kt becoming northeast. chance of
showers in the morning. waves 1 to 3 ft. 
.saturday night...northeast winds 10 to 20 kt becoming east.
waves 2 to 4 ft. 
.sunday...east winds 10 to 15 kt. waves 2 to 4 ft. 
.sunday night...northeast winds 10 to 15 kt becoming southeast.
waves 1 to 3 ft. 
.monday...southeast winds 10 to 15 kt. waves 1 to 3 ft. 
.tuesday...southeast winds to 30 kt becoming south. waves 4 to
7 ft occasionally to 9 ft.  

$$

fzus63 kmqt 040201
glfls 
expires:202609040800;;864173

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt thu sep 3 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 29.9 inch ridge extends over lake superior from a 30.2 inch high 
over hudson bay, while 29.7 inch low moves into mn. this will cause 
height falls over the western half of the lake tonight, but the 
parent low weakens to 29.8 inches by friday morning. meanwhile, the 
ridge over the lake gradually strengthen to 30.1 inches through this 
weekend as a 29.8 inch low over quebec shifts east towards nova 
scotia and deepens to 29.5 inches. ridging builds to 30.2 inches 
over the lake by early next week as high pressure over hudson bay 
strengthens to 30.4 inches. broad troughing of 29.5 to 29.6 inches 
will persist over the rockies and northern plains through the period.




lsz264-040800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1000 pm edt thu sep 3 2026

.rest of tonight...east winds 5 to 15 knots. a slight chance of
showers after midnight. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. a slight chance of showers through early
afternoon. waves calm to 2 feet. 
.friday night...east winds 5 to 15 knots backing northeast after
midnight, then veering east late. a slight chance of showers
after midnight. waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots. waves calm to 2 feet. 
.saturday night...east winds 5 to 15 knots diminishing to less
than 10 knots after midnight. waves calm to 2 feet. 
.sunday...southeast winds less than 10 knots. waves calm to
2 feet. 
.sunday night...southeast winds 5 to 15 knots. waves calm to
2 feet. 
.monday...east winds 10 to 20 knots becoming southeast 20 to
30 knots. a chance of showers. showers likely. waves building to
3 to 6 feet occasionally to 8 feet. 
.tuesday...south gales to 35 knots diminishing to 20 to 30 knots.
showers likely. a chance of showers. waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet. 

$$

fzus63 kmqt 040201
glfls 
expires:202609040800;;864174

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt thu sep 3 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 29.9 inch ridge extends over lake superior from a 30.2 inch high 
over hudson bay, while 29.7 inch low moves into mn. this will cause 
height falls over the western half of the lake tonight, but the 
parent low weakens to 29.8 inches by friday morning. meanwhile, the 
ridge over the lake gradually strengthen to 30.1 inches through this 
weekend as a 29.8 inch low over quebec shifts east towards nova 
scotia and deepens to 29.5 inches. ridging builds to 30.2 inches 
over the lake by early next week as high pressure over hudson bay 
strengthens to 30.4 inches. broad troughing of 29.5 to 29.6 inches 
will persist over the rockies and northern plains through the period.




lsz265-040800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1000 pm edt thu sep 3 2026

.rest of tonight...east winds 10 to 20 knots. a chance of showers
after midnight. waves calm to 2 feet. 
.friday...east winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. a chance of showers. waves building to 1 to
3 feet. 
.friday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.saturday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves calm to 2 feet. 
.saturday night...east winds 5 to 15 knots veering southeast
after midnight. waves calm to 2 feet. 
.sunday...southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.sunday night...southeast winds 10 to 20 knots veering south
after midnight. waves calm to 2 feet. 
.monday...east winds 15 to 25 knots becoming southeast 20 to
30 knots. a chance of showers. waves building to 3 to 5 feet
occasionally to 7 feet. 
.tuesday...south gales to 35 knots diminishing to 20 to 30 knots.
showers likely. a chance of showers. waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 2 to 4 feet. 

$$

fzus63 kmqt 040201
glfls 
expires:202609040800;;864175

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt thu sep 3 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 29.9 inch ridge extends over lake superior from a 30.2 inch high 
over hudson bay, while 29.7 inch low moves into mn. this will cause 
height falls over the western half of the lake tonight, but the 
parent low weakens to 29.8 inches by friday morning. meanwhile, the 
ridge over the lake gradually strengthen to 30.1 inches through this 
weekend as a 29.8 inch low over quebec shifts east towards nova 
scotia and deepens to 29.5 inches. ridging builds to 30.2 inches 
over the lake by early next week as high pressure over hudson bay 
strengthens to 30.4 inches. broad troughing of 29.5 to 29.6 inches 
will persist over the rockies and northern plains through the period.




lsz266-040800-
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-
1000 pm edt thu sep 3 2026

.rest of tonight...east winds 5 to 15 knots. a chance of showers
after midnight. waves calm to 2 feet. 
.friday...east winds 10 to 20 knots. a slight chance of showers
through early afternoon. waves calm to 2 feet. 
.friday night...northeast winds 5 to 15 knots veering east late.
waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots. waves calm to 2 feet. 
.saturday night...east winds 5 to 15 knots. waves calm to 2 feet.
.sunday...southeast winds 5 to 15 knots. waves calm to 2 feet. 
.sunday night...southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. waves calm to 2 feet. 
.monday...east winds 15 to 25 knots becoming southeast 20 to
30 knots. a chance of showers. waves building to 3 to 6 feet
occasionally to 8 feet. 
.tuesday...south gales to 35 knots diminishing to 20 to 30 knots.
showers likely. a chance of showers. waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet. 

$$

fzus63 kmqt 040201
glfls 
expires:202609040800;;864176

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt thu sep 3 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 29.9 inch ridge extends over lake superior from a 30.2 inch high 
over hudson bay, while 29.7 inch low moves into mn. this will cause 
height falls over the western half of the lake tonight, but the 
parent low weakens to 29.8 inches by friday morning. meanwhile, the 
ridge over the lake gradually strengthen to 30.1 inches through this 
weekend as a 29.8 inch low over quebec shifts east towards nova 
scotia and deepens to 29.5 inches. ridging builds to 30.2 inches 
over the lake by early next week as high pressure over hudson bay 
strengthens to 30.4 inches. broad troughing of 29.5 to 29.6 inches 
will persist over the rockies and northern plains through the period.




lsz267-040800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1000 pm edt thu sep 3 2026

.rest of tonight...northeast winds 5 to 15 knots veering east
after midnight. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots backing northeast in the
afternoon. waves calm to 2 feet. 
.friday night...northeast winds 10 to 20 knots veering east after
midnight. waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots backing northeast by mid
afternoon. waves calm to 2 feet. 
.saturday night...northeast winds 5 to 15 knots veering southeast
after midnight. waves calm to 2 feet. 
.sunday...southeast winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.sunday night...south winds 5 to 15 knots. waves calm to 2 feet. 
.monday...east winds 5 to 15 knots becoming southeast 15 to
25 knots. a chance of showers. waves building to 2 to 4 feet. 
.tuesday...southeast winds 20 to 30 knots veering south. showers
likely. a chance of showers. waves building to 3 to 6 feet
occasionally to 8 feet. 

$$

fzus63 kmqt 040201
glfls 
expires:202609040800;;864171

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt thu sep 3 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 29.9 inch ridge extends over lake superior from a 30.2 inch high 
over hudson bay, while 29.7 inch low moves into mn. this will cause 
height falls over the western half of the lake tonight, but the 
parent low weakens to 29.8 inches by friday morning. meanwhile, the 
ridge over the lake gradually strengthen to 30.1 inches through this 
weekend as a 29.8 inch low over quebec shifts east towards nova 
scotia and deepens to 29.5 inches. ridging builds to 30.2 inches 
over the lake by early next week as high pressure over hudson bay 
strengthens to 30.4 inches. broad troughing of 29.5 to 29.6 inches 
will persist over the rockies and northern plains through the period.




lsz162-040800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt thu sep 3 2026 /900 pm cdt thu sep 3 2026/

.rest of tonight...east winds 15 to 25 knots backing northeast
after midnight. a chance of showers and thunderstorms. waves 2 to
4 feet. 
.friday...northeast winds 15 to 25 knots increasing to 20 to
30 knots late. a slight chance of showers through early
afternoon. waves 2 to 4 feet. 
.friday night...northeast winds 15 to 25 knots diminishing to
5 to 15 knots. waves subsiding to calm to 2 feet. 
.saturday...northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.saturday night...northeast winds 5 to 15 knots. a slight chance
of showers after midnight. waves calm to 2 feet. 
.sunday...east winds 5 to 15 knots backing northeast by mid
afternoon. a chance of showers. waves calm to 2 feet. 
.sunday night...northeast winds 5 to 15 knots. a chance of
showers. waves calm to 2 feet. 
.monday...east gales to 35 knots. a chance of showers. a chance
of thunderstorms. showers likely. waves building to 3 to 6 feet
occasionally to 8 feet. 
.tuesday...south gales to 35 knots becoming southwest 20 to
30 knots. showers likely. a chance of showers. waves subsiding to
1 to 3 feet. 

$$

fzus63 kmqt 040201
glfls 
expires:202609040800;;864172

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt thu sep 3 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 29.9 inch ridge extends over lake superior from a 30.2 inch high 
over hudson bay, while 29.7 inch low moves into mn. this will cause 
height falls over the western half of the lake tonight, but the 
parent low weakens to 29.8 inches by friday morning. meanwhile, the 
ridge over the lake gradually strengthen to 30.1 inches through this 
weekend as a 29.8 inch low over quebec shifts east towards nova 
scotia and deepens to 29.5 inches. ridging builds to 30.2 inches 
over the lake by early next week as high pressure over hudson bay 
strengthens to 30.4 inches. broad troughing of 29.5 to 29.6 inches 
will persist over the rockies and northern plains through the period.




lsz263-040800-
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-
1000 pm edt thu sep 3 2026

.rest of tonight...east winds 10 to 20 knots. a chance of showers
and thunderstorms. waves 2 to 4 feet subsiding to 1 to 3 feet,
then building to 2 to 4 feet. 
.friday...east winds 10 to 20 knots backing northeast late. a
slight chance of showers through early afternoon. waves 2 to
4 feet. 
.friday night...northeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight. a slight chance of showers after
midnight. waves subsiding to calm to 2 feet. 
.saturday...east winds 5 to 15 knots backing northeast by mid
afternoon. waves calm to 2 feet. 
.saturday night...east winds 5 to 15 knots diminishing to less
than 10 knots after midnight. waves calm to 2 feet. 
.sunday...east winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.sunday night...east winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet. 
.monday...east winds 15 to 25 knots becoming southeast gales to
35 knots. a chance of showers. showers likely. waves building to
3 to 6 feet occasionally to 8 feet. 
.tuesday...south gales to 35 knots veering southwest. showers
likely. a chance of showers. waves subsiding to 2 to 4 feet. 

$$