fzus61 kbuf 251402
glflo 
expires:202608252100;;337504

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt tue aug 25 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 averaging 30.1 inches will build from the 
western and central great lakes through wednesday. the ridge will 
exit eastward wednesday night through thursday morning and allow a 
warm front to sweep northeastward across lake ontario before a cold 
front sweeps eastward across the lake thursday evening through 
thursday night. behind the cold front, a high pressure ridge 
averaging 30.0 inches should build from the upper midwest through 
saturday and then begin to exit eastward on sunday.


loz062-252100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt tue aug 25 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 251402
glflo 
expires:202608252100;;337505

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt tue aug 25 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 averaging 30.1 inches will build from the 
western and central great lakes through wednesday. the ridge will 
exit eastward wednesday night through thursday morning and allow a 
warm front to sweep northeastward across lake ontario before a cold 
front sweeps eastward across the lake thursday evening through 
thursday night. behind the cold front, a high pressure ridge 
averaging 30.0 inches should build from the upper midwest through 
saturday and then begin to exit eastward on sunday.


loz063>065-252100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt tue aug 25 2026

.this afternoon...northwest winds 10 to 15 knots becoming west. a
chance of showers. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tonight...west winds 10 knots or less. waves 2 feet or less. 
.wednesday...southwest winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.wednesday night...east winds 5 to 15 knots becoming south 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.thursday...south winds 15 to 20 knots becoming west 5 to
15 knots. showers likely with a chance of thunderstorms. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.friday...northwest winds 5 to 10 knots becoming north. waves
2 feet or less. 
.saturday...north winds 10 knots or less becoming south. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 251344
glfle 
expires:202608252015;;337052

open lake forecast for lake erie
national weather service cleveland oh
944 am edt tue aug 25 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 moves across the region today before 
shifting east. low pressure 29.80 inches tracks north of the great
lakes wednesday and thursday, pulling a cold front across lake 
erie on thursday. high pressure 30.20 inches builds into the great
lakes friday and into the weekend.


lez165>167-252015-
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-
944 am edt tue aug 25 2026

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

$$

fzus61 kcle 251344
glfle 
expires:202608252015;;337053

open lake forecast for lake erie
national weather service cleveland oh
944 am edt tue aug 25 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 moves across the region today before 
shifting east. low pressure 29.80 inches tracks north of the great
lakes wednesday and thursday, pulling a cold front across lake 
erie on thursday. high pressure 30.20 inches builds into the great
lakes friday and into the weekend.


lez061-168-169-252015-
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-
944 am edt tue aug 25 2026

.this afternoon...northwest winds 10 knots or less. waves 2 feet 
or less. 
.tonight...west winds 5 to 10 knots becoming south. waves 1 foot
or less. 
.wednesday...south winds 5 to 15 knots becoming southwest less
than 10 knots. waves 2 feet or less. 
.wednesday night...south winds 5 to 15 knots becoming southwest
15 to 20 knots. showers likely overnight. waves 1 to 3 feet
building to 2 to 4 feet. 
.thursday...southwest winds 15 to 20 knots becoming north 5 to
15 knots. a chance of showers. waves 2 to 4 feet subsiding to
1 to 3 feet. 
.friday...north winds 5 to 10 knots becoming northeast. waves
1 foot or less. 
.saturday...east winds 10 knots or less becoming south. waves
1 foot or less. 

$$

fzus61 kcle 251344
glfle 
expires:202608252015;;337051

open lake forecast for lake erie
national weather service cleveland oh
944 am edt tue aug 25 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 moves across the region today before 
shifting east. low pressure 29.80 inches tracks north of the great
lakes wednesday and thursday, pulling a cold front across lake 
erie on thursday. high pressure 30.20 inches builds into the great
lakes friday and into the weekend.


lez162>164-252015-
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-
944 am edt tue aug 25 2026

.this afternoon...northwest winds 10 knots or less becoming
variable. waves 1 foot or less. 
.tonight...southeast winds 5 to 10 knots becoming south. waves
2 feet or less. 
.wednesday...southwest winds 10 to 15 knots. waves 2 feet or
less. 
.wednesday night...south winds 10 to 15 knots becoming southwest.
showers likely. waves 1 to 3 feet. 
.thursday...west winds 5 to 15 knots becoming northeast. a chance
of showers thursday night. waves 1 to 3 feet subsiding to 1 foot
or less. 
.friday...north winds 5 to 10 knots becoming east. waves 2 feet
or less. 
.saturday...southeast winds 10 knots or less becoming south.
waves 1 foot or less. 

$$

fzus63 kdtx 251930
glflh 
expires:202608260330;;350776

open lake forecast for lake huron
national weather service detroit/pontiac mi
330 pm edt tue aug 25 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...high pressure, 30.10 inches, holds over the great
lakes today. southwest winds will increase tonight ahead of a
cold front, which brings showers and thunderstorms to the central
great lakes tomorrow.


lhz462>464-260330-
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-
330 pm edt tue aug 25 2026

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


$$

fzus63 kdtx 251930
glflh 
expires:202608260330;;350775

open lake forecast for lake huron
national weather service detroit/pontiac mi
330 pm edt tue aug 25 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...high pressure, 30.10 inches, holds over the great
lakes today. southwest winds will increase tonight ahead of a
cold front, which brings showers and thunderstorms to the central
great lakes tomorrow.


lhz362-363-260330-
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-
330 pm edt tue aug 25 2026

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


$$

fzus63 kdtx 251930
glflh 
expires:202608260330;;350774

open lake forecast for lake huron
national weather service detroit/pontiac mi
330 pm edt tue aug 25 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...high pressure, 30.10 inches, holds over the great
lakes today. southwest winds will increase tonight ahead of a
cold front, which brings showers and thunderstorms to the central
great lakes tomorrow.


lhz361-260330-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
330 pm edt tue aug 25 2026

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


$$

fzus63 kdtx 251358
glfsc 
expires:202608252200;;337308

lake st clair forecast
national weather service detroit/pontiac mi
958 am edt tue aug 25 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...high pressure, 30.10 inches, centered over the ohio
valley will provide light wind this afternoon. southerly winds
will increase tonight ahead of a cold front, which brings showers
and thunderstorms to the central great lakes tomorrow.


lcz460-252200-
lake st clair-
958 am edt tue aug 25 2026

.rest of today...light and variable winds becoming southeast 5 to 10
knots late in the afternoon. mostly sunny. waves 2 feet or less.
.tonight...south winds 5 to 10 knots. partly cloudy. waves 2 feet or
less.
.wednesday...southwest winds 5 to 10 knots becoming south 10 to 15
knots in the late morning and afternoon. partly sunny. waves 2 feet
or less.
.wednesday night...southwest winds 10 to 15 knots. partly cloudy. a
chance of light showers . waves 2 feet or less.
.thursday...west winds 5 to 10 knots veering to the north in the
evening. mostly clear. waves 2 feet or less.
.friday...northeast winds 10 to 15 knots. mostly clear. waves 2 feet
or less.
.saturday...south winds 10 to 15 knots. mostly clear. waves 2 feet
or less.

$$

fzus63 kmkx 251349
glflm 
expires:202608252115;;337176

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
849 am cdt tue aug 25 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 going forecast this morning.

high pressure of 30.1 inches centered over southern lake michigan
will exit the region as low pressure system around 29.7 inches 
approaches from the northern plains. as the low crosses lake
superior east, an associated cold front will move across lake 
michigan wednesday. showers and thunderstorms will accompany the 
approaching/passing surface low and cold front tonight into 
wednesday. an isolated stronger storm with hail and gusty winds 
will be possible but chances are low. increasing southerly winds 
today will shift to the northwest late wednesday afternoon/evening.
breezy northwest winds are expected through wednesday night. 

high pressure around 30.1 inches will gradually build in from the
northern plains behind this exiting low for thursday and friday. 
light north to northeast winds are expected.


lmz080-669-671-673-675-777-779-870-872-874-876-878-252115-
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-
849 am cdt tue aug 25 2026

sheboygan wi to pentwater mi south...

.rest of today...south winds 5 to 10 kt increasing to 15 to
25 kt. waves 1 to 2 ft building to 3 to 5 ft. 
.tonight...south winds 15 to 25 kt becoming southwest. slight
chance of showers and thunderstorms overnight. waves 3 to 5 ft
building to 4 to 6 ft occasionally to 8 ft. 
.wednesday...southwest winds 15 to 25 kt diminishing to 10 to
20 kt. chance of showers. waves 4 to 7 ft occasionally to 9 ft
subsiding to 3 to 5 ft. 
.wednesday night...west winds 10 to 20 kt becoming northwest.
waves 2 to 4 ft. 
.thursday...north winds 10 to 20 kt increasing to 15 to 25 kt.
waves 3 to 5 ft. 
.thursday night...north winds 10 to 20 kt becoming northeast
10 to 15 kt. waves 2 to 4 ft subsiding to 1 to 3 ft. 
.friday...northeast winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 to 2 ft. 
.saturday...south winds 10 to 20 kt increasing to 30 kt. waves
1 to 3 ft building to 3 to 5 ft.  

$$

fzus63 kmkx 251349
glflm 
expires:202608252115;;337175

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
849 am cdt tue aug 25 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 going forecast this morning.

high pressure of 30.1 inches centered over southern lake michigan
will exit the region as low pressure system around 29.7 inches 
approaches from the northern plains. as the low crosses lake
superior east, an associated cold front will move across lake 
michigan wednesday. showers and thunderstorms will accompany the 
approaching/passing surface low and cold front tonight into 
wednesday. an isolated stronger storm with hail and gusty winds 
will be possible but chances are low. increasing southerly winds 
today will shift to the northwest late wednesday afternoon/evening.
breezy northwest winds are expected through wednesday night. 

high pressure around 30.1 inches will gradually build in from the
northern plains behind this exiting low for thursday and friday. 
light north to northeast winds are expected.


lmz261-362-364-366-563-565-567-868-252115-
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-
849 am cdt tue aug 25 2026

sheboygan wi to pentwater mi north...

.rest of today...southwest winds 5 to 10 kt becoming south 15 to
25 kt. waves 1 to 2 ft building to 3 to 5 ft. 
.tonight...south winds 15 to 25 kt. slight chance of showers in
the evening, then chance of showers and slight chance of
thunderstorms overnight. waves 4 to 6 ft occasionally to 8 ft. 
.wednesday...southwest winds to 30 kt. showers likely in the
morning, then showers likely with a chance of thunderstorms in
the afternoon. waves 4 to 7 ft occasionally to 9 ft subsiding to
3 to 5 ft. 
.wednesday night...northwest winds 15 to 25 kt diminishing to
10 to 20 kt. chance of showers and thunderstorms in the evening.
waves 2 to 4 ft subsiding to 1 to 3 ft. 
.thursday...northwest winds 15 to 25 kt becoming north. waves
2 to 4 ft. 
.thursday night...north winds 15 to 25 kt diminishing to 10 to
15 kt. waves 1 to 3 ft. 
.friday...north winds 10 to 15 kt. waves 1 to 2 ft. 
.saturday...south winds 10 to 20 kt increasing to 30 kt. waves
1 to 3 ft building to 3 to 5 ft.  

$$

fzus63 kmqt 251401
glfls 
expires:202608252000;;337460

open lake forecast for lake superior
national weather service marquette mi
1000 am edt tue aug 25 2026

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

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

.synopsis...

this morning, lake superior is between 30.1 inch high pressure over 
the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz267-252000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1001 am edt tue aug 25 2026

.rest of today...south winds 5 to 15 knots backing southeast in
the afternoon, then increasing to 10 to 20 knots late. waves calm
to 2 feet. 
.tonight...south winds 15 to 25 knots. showers and a chance of
thunderstorms. waves building to 2 to 4 feet. 
.wednesday...south winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then veering west late. showers likely
through early afternoon. a chance of thunderstorms. a chance of
showers by mid afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. a slight chance of showers. waves
building to 3 to 5 feet occasionally to 7 feet. 
.thursday...northwest winds 15 to 25 knots. waves subsiding to
2 to 4 feet. 
.thursday night...north winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 
.friday...northwest winds 5 to 15 knots backing south. waves calm
to 2 feet. 
.saturday...south winds 10 to 20 knots. a chance of showers.
waves building to 1 to 3 feet. 

$$

fzus63 kmqt 251401
glfls 
expires:202608252000;;337457

open lake forecast for lake superior
national weather service marquette mi
1000 am edt tue aug 25 2026

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

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

.synopsis...

this morning, lake superior is between 30.1 inch high pressure over 
the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz264-252000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1001 am edt tue aug 25 2026

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

$$

fzus63 kmqt 251401
glfls 
expires:202608252000;;337458

open lake forecast for lake superior
national weather service marquette mi
1000 am edt tue aug 25 2026

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

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

.synopsis...

this morning, lake superior is between 30.1 inch high pressure over 
the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz265-252000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1001 am edt tue aug 25 2026

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

$$

fzus63 kmqt 251401
glfls 
expires:202608252000;;337455

open lake forecast for lake superior
national weather service marquette mi
1000 am edt tue aug 25 2026

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

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

.synopsis...

this morning, lake superior is between 30.1 inch high pressure over 
the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz162-252000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt tue aug 25 2026 /901 am cdt tue aug 25 2026/

.rest of today...south winds 5 to 15 knots backing east in the
afternoon. a chance of showers and thunderstorms. waves calm to
2 feet. 
.tonight...east winds 5 to 15 knots veering west after midnight,
then increasing to 10 to 20 knots late. a chance of showers and
thunderstorms through midnight. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots veering northwest late.
waves calm to 2 feet. 
.wednesday night...northwest winds 10 to 20 knots. waves calm to
2 feet. 
.thursday...northwest winds 5 to 15 knots backing south by mid
afternoon. waves calm to 2 feet. 
.thursday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.friday...east winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 

$$

fzus63 kmqt 251401
glfls 
expires:202608252000;;337456

open lake forecast for lake superior
national weather service marquette mi
1000 am edt tue aug 25 2026

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

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

.synopsis...

this morning, lake superior is between 30.1 inch high pressure over 
the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz263-252000-
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-
1001 am edt tue aug 25 2026

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

$$

fzus63 kmqt 251401
glfls 
expires:202608252000;;337459

open lake forecast for lake superior
national weather service marquette mi
1000 am edt tue aug 25 2026

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

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

.synopsis...

this morning, lake superior is between 30.1 inch high pressure over 
the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz266-252000-
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-
1001 am edt tue aug 25 2026

.rest of today...south winds 10 to 20 knots becoming southeast
5 to 15 knots in the afternoon, then increasing to 10 to 20 knots
late. a slight chance of showers by mid afternoon. waves calm to
2 feet. 
.tonight...south winds 15 to 25 knots diminishing to 10 to
20 knots late. showers likely through midnight. a chance of
thunderstorms. a chance of showers after midnight. waves building
to 2 to 4 feet. 
.wednesday...southwest winds 10 to 20 knots becoming west 15 to
25 knots in the afternoon, then veering northwest late. a chance
of showers and a slight chance of thunderstorms. waves subsiding
to 1 to 3 feet, then building to 2 to 4 feet. 
.wednesday night...northwest winds 15 to 25 knots. a slight
chance of showers. waves subsiding to 1 to 3 feet, then building
to 3 to 5 feet occasionally to 7 feet. 
.thursday...north winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. waves subsiding to 1 to 3 feet. 
.thursday night...northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.friday...northwest winds 5 to 15 knots becoming south 10 to
20 knots. waves calm to 2 feet. 
.saturday...south winds 10 to 20 knots increasing to 15 to
25 knots. a chance of showers. waves building to 1 to 3 feet. 

$$