fzus61 kbuf 042003
glflo 
expires:202608050300;;623167

open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt tue aug 4 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 high pressure ridge averaging 30.0 inches exits slowly 
toward new england through this weekend. a cold front should 
approach lake ontario slowly from the northwest thursday through 
this weekend.


loz063>065-050300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt tue aug 4 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 042003
glflo 
expires:202608050300;;623166

open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt tue aug 4 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 high pressure ridge averaging 30.0 inches exits slowly 
toward new england through this weekend. a cold front should 
approach lake ontario slowly from the northwest thursday through 
this weekend.


loz062-050300-
lake ontario open waters from the niagara river to hamlin beach-
403 pm edt tue aug 4 2026

.tonight...east winds 5 to 10 knots becoming south. waves 1 foot
or less. 
.wednesday...south winds 10 knots or less becoming east. waves
1 foot or less. 
.wednesday night...east winds 10 knots or less becoming
southwest. waves 1 foot or less. 
.thursday...light and variable winds. a chance of showers. waves
1 foot or less. 
.thursday night...south winds less than 10 knots becoming west.
waves 1 foot or less. 
.friday...light and variable winds becoming southwest 5 to
10 knots. a chance of showers and thunderstorms. waves 1 foot or
less. 
.saturday...southwest winds 5 to 15 knots becoming west. a chance
of showers and thunderstorms during the day, then a chance of
showers saturday night. waves 1 foot or less. 
.sunday...west winds 5 to 15 knots becoming southwest. a chance
of showers and thunderstorms. waves 1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 041946
glfle 
expires:202608050230;;622769

open lake forecast for lake erie
national weather service cleveland oh
346 pm edt tue aug 4 2026

for waters beyond five nautical miles of shore on lake erie

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

.synopsis...
high pressure of 30.00 inches over lake erie will weaken on
wednesday as it drifts east ahead of an approaching cold front. 
this front will slow just to the west of lake erie thursday  
before slowly moving east across the lake friday and saturday.


lez162>164-050230-
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-
346 pm edt tue aug 4 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 041946
glfle 
expires:202608050230;;622770

open lake forecast for lake erie
national weather service cleveland oh
346 pm edt tue aug 4 2026

for waters beyond five nautical miles of shore on lake erie

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

.synopsis...
high pressure of 30.00 inches over lake erie will weaken on
wednesday as it drifts east ahead of an approaching cold front. 
this front will slow just to the west of lake erie thursday  
before slowly moving east across the lake friday and saturday.


lez061-165>169-050230-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
vermilion to avon point oh beyond 5 nm off shoreline to us-
canadian border-
avon point to willowick oh beyond 5 nm off shoreline to us-
canadian border-willowick to geneva-on-the-
lake oh beyond 5nm off shoreline to us-canadian border-geneva-on-
the-lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
346 pm edt tue aug 4 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 041856
glfsc 
expires:202608050300;;621249

lake st clair forecast
national weather service detroit/pontiac mi
256 pm edt tue aug 4 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, 30.00 inches, retreats toward the mid
atlantic tonight. a slow moving cold front will move into lake
huron wednesday triggering showers and a chance for thunderstorms
across the region through the end of the workweek.


lcz460-050300-
lake st clair-
256 pm edt tue aug 4 2026

.tonight...south winds 5 to 10 knots. clear. waves 2 feet or less.
.wednesday...light and variable winds becoming south 5 to 10 knots
in the afternoon. mostly sunny. waves 2 feet or less.
.wednesday night...southwest winds 5 to 10 knots. partly cloudy.
waves 2 feet or less.
.thursday...southwest winds 5 to 10 knots. mostly cloudy. light
showers likely until late afternoon...then light showers likely and
a chance of thunderstorms early in the afternoon. waves 2 feet or
less.
.thursday night...north winds 5 to 10 knots early in the evening
becoming light and variable. mostly cloudy early in the evening
becoming partly cloudy. light showers likely and a chance of
thunderstorms early in the evening. a chance of light showers in the
late evening and overnight. waves 2 feet or less.
.friday...south winds 5 to 10 knots. partly sunny in the
morning...then partly cloudy with a chance of showers and
thunderstorms in the afternoon and evening. waves 2 feet or less.
.saturday...west winds 5 to 10 knots. mostly clear. a chance of
showers and thunderstorms. waves 2 feet or less.
.sunday...southwest winds 10 to 15 knots. mostly clear. a chance of
showers and thunderstorms. waves 2 feet or less.

$$

fzus63 kdtx 041856
glflh 
expires:202608050300;;621245

open lake forecast for lake huron
national weather service detroit/pontiac mi
256 pm edt tue aug 4 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, 30.00 inches, retreats toward the mid
atlantic tonight. a slow moving cold front will move into lake
huron wednesday triggering showers and a chance for thunderstorms
across the region through the end of the workweek.


lhz361-050300-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
256 pm edt tue aug 4 2026

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


$$

fzus63 kdtx 041856
glflh 
expires:202608050300;;621246

open lake forecast for lake huron
national weather service detroit/pontiac mi
256 pm edt tue aug 4 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, 30.00 inches, retreats toward the mid
atlantic tonight. a slow moving cold front will move into lake
huron wednesday triggering showers and a chance for thunderstorms
across the region through the end of the workweek.


lhz362-363-050300-
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-
256 pm edt tue aug 4 2026

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


$$

fzus63 kdtx 041856
glflh 
expires:202608050300;;621247

open lake forecast for lake huron
national weather service detroit/pontiac mi
256 pm edt tue aug 4 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, 30.00 inches, retreats toward the mid
atlantic tonight. a slow moving cold front will move into lake
huron wednesday triggering showers and a chance for thunderstorms
across the region through the end of the workweek.


lhz462>464-050300-
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-
256 pm edt tue aug 4 2026

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


$$

fzus63 kmkx 041855
glflm 
expires:202608050315;;621243

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
155 pm cdt tue aug 4 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 high pressure is centered between lakes erie and ontario 
this afternoon, resulting in generally southerly winds across the
open waters. a cold front is moving into western wisconsin, and 
will approach lake michigan through the remainder of the afternoon.
the front will slowly move across the waters this evening into 
wednesday morning, bringing a brief north-northwest wind shift. 
periods of showers and storms will accompany the slow-moving 
front, with severe weather appearing unlikely at this time. winds 
will trend variable wednesday evening through thursday, when 30.1 
inch high pressure is forecast to build back into the western 
great lakes.

a prolonged period of south-southwest winds will become established 
across lake michigan thursday night through sunday as 30.1 inch 
high pressure lingers off the mid-atlantic coast and 29.6 inch 
low pressure stalls over the hudson bay. a slow-moving surface
front will linger across the western great lakes saturday into the
beginning of next week, bringing multiple periods of showers and
thunderstorms. some of these storms could be stronger, with
additional details clarifying through the end of this week.


lmz080-669-671-673-675-777-779-870-872-874-876-878-050315-
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-
155 pm cdt tue aug 4 2026

sheboygan wi to pentwater mi south...

.tonight...south winds 15 to 25 kt diminishing to 10 to 20 kt
late this evening, then becoming southwest after midnight
diminishing to 10 to 15 kt late. chance of showers and slight
chance of thunderstorms overnight. waves 3 to 5 ft subsiding to
2 to 4 ft. 
.wednesday...southwest winds 10 to 15 kt diminishing to 5 to
10 kt. chance of showers and slight chance of thunderstorms in
the morning, then slight chance of showers and thunderstorms in
the afternoon. waves 1 to 3 ft. 
.wednesday night...west winds 5 to 10 kt becoming north. chance
of showers and thunderstorms. waves 1 to 2 ft. 
.thursday...northeast winds 5 to 10 kt becoming north 10 to
15 kt. chance of showers in the morning. waves 1 ft or less.
.thursday night...east winds 5 to 10 kt veering to southwest.
waves 1 ft or less. 
.friday...southwest winds 5 to 10 kt becoming south 10 to 20 kt
in the afternoon. waves 1 to 2 ft. 
.friday night...south winds 10 to 20 kt becoming southwest 10 to
15 kt. waves 1 to 3 ft. 
.saturday...southwest winds 10 to 20 kt becoming south. waves
1 to 3 ft. 
.sunday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 2 to 4 ft.  

$$

fzus63 kmkx 041855
glflm 
expires:202608050315;;621242

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
155 pm cdt tue aug 4 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 high pressure is centered between lakes erie and ontario 
this afternoon, resulting in generally southerly winds across the
open waters. a cold front is moving into western wisconsin, and 
will approach lake michigan through the remainder of the afternoon.
the front will slowly move across the waters this evening into 
wednesday morning, bringing a brief north-northwest wind shift. 
periods of showers and storms will accompany the slow-moving 
front, with severe weather appearing unlikely at this time. winds 
will trend variable wednesday evening through thursday, when 30.1 
inch high pressure is forecast to build back into the western 
great lakes.

a prolonged period of south-southwest winds will become established 
across lake michigan thursday night through sunday as 30.1 inch 
high pressure lingers off the mid-atlantic coast and 29.6 inch 
low pressure stalls over the hudson bay. a slow-moving surface
front will linger across the western great lakes saturday into the
beginning of next week, bringing multiple periods of showers and
thunderstorms. some of these storms could be stronger, with
additional details clarifying through the end of this week.


lmz261-362-364-366-563-565-567-868-050315-
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-
155 pm cdt tue aug 4 2026

sheboygan wi to pentwater mi north...

.tonight...southwest winds 15 to 25 kt diminishing to 10 to 20 kt
late this evening, then backing to east 10 to 15 kt after
midnight becoming northeast late. chance of showers and
thunderstorms this evening, then chance of showers and slight
chance of thunderstorms overnight. patchy fog overnight. waves
4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft. 
.wednesday...northeast winds 10 to 15 kt diminishing to 5 to
10 kt. patchy fog in the morning. chance of showers and slight
chance of thunderstorms in the morning, then slight chance of
showers in the afternoon. waves 1 to 3 ft subsiding to 1 to 2 ft.
.wednesday night...southeast winds 5 to 10 kt. waves 1 ft or
less. 
.thursday...south winds 10 to 15 kt becoming southwest. waves
1 ft or less. 
.thursday night...south winds 10 to 15 kt becoming southwest
10 to 20 kt. waves 1 to 2 ft. 
.friday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 2 to 4 ft. 
.friday night...south winds 15 to 25 kt becoming southwest. waves
2 to 4 ft. 
.saturday...southwest winds 15 to 25 kt. waves 1 to 3 ft. 
.sunday...southwest winds 15 to 25 kt. waves 2 to 4 ft.  

$$

fzus63 kmqt 042001
glfls 
expires:202608050800;;623092

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 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...

troughing to 29.9 remains over lake superior tonight before 30.0 
inch ridging returns on wednesday as high pressure builds into the 
great lakes from the northern plains. for the late week and into the 
weekend, pressure over lake superior will remain around 29.9 to 30.0 
inches between a 30.3 inch bermuda high and 29.5 inch low pressure 
near the western shores of hudson bay.




lsz162-050800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt tue aug 4 2026 /301 pm cdt tue aug 4 2026/

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

$$

fzus63 kmqt 042001
glfls 
expires:202608050800;;623093

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 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...

troughing to 29.9 remains over lake superior tonight before 30.0 
inch ridging returns on wednesday as high pressure builds into the 
great lakes from the northern plains. for the late week and into the 
weekend, pressure over lake superior will remain around 29.9 to 30.0 
inches between a 30.3 inch bermuda high and 29.5 inch low pressure 
near the western shores of hudson bay.




lsz263-050800-
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 tue aug 4 2026

.late this afternoon...southwest winds 15 to 25 knots. waves 2 to
4 feet. 
.tonight...west winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. waves subsiding to calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing south late. waves
building to 1 to 3 feet. 
.wednesday night...south winds 5 to 15 knots becoming southwest
10 to 20 knots late. waves subsiding to calm to 2 feet. 
.thursday...southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.thursday night...south winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet. 
.friday...southwest winds 15 to 25 knots. a chance of showers. a
chance of thunderstorms by mid afternoon. waves subsiding to 1 to
3 feet. 
.friday night...west winds 5 to 15 knots. waves subsiding to calm
to 2 feet. 
.saturday...west winds 15 to 25 knots diminishing to 10 to
20 knots. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 
.sunday...west winds 10 to 20 knots diminishing to 5 to 15 knots.
waves calm to 2 feet. 

$$

fzus63 kmqt 042001
glfls 
expires:202608050800;;623094

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 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...

troughing to 29.9 remains over lake superior tonight before 30.0 
inch ridging returns on wednesday as high pressure builds into the 
great lakes from the northern plains. for the late week and into the 
weekend, pressure over lake superior will remain around 29.9 to 30.0 
inches between a 30.3 inch bermuda high and 29.5 inch low pressure 
near the western shores of hudson bay.




lsz264-050800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 pm edt tue aug 4 2026

.late this afternoon...southwest winds 15 to 25 knots. waves 2 to
4 feet. 
.tonight...west winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. waves subsiding to calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots backing south late.
waves calm to 2 feet. 
.wednesday night...south winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...southwest winds 10 to 20 knots. waves building to
2 to 4 feet. 
.thursday night...south winds 15 to 25 knots veering southwest
after midnight. waves subsiding to 1 to 3 feet, then building to
3 to 5 feet occasionally to 7 feet. 
.friday...southwest winds 10 to 20 knots. a chance of showers.
waves subsiding to 1 to 3 feet. 
.friday night...west winds 5 to 15 knots. a chance of showers
through midnight. waves subsiding to calm to 2 feet. 
.saturday...southwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves calm to 2 feet. 
.sunday...west winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 042001
glfls 
expires:202608050800;;623095

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 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...

troughing to 29.9 remains over lake superior tonight before 30.0 
inch ridging returns on wednesday as high pressure builds into the 
great lakes from the northern plains. for the late week and into the 
weekend, pressure over lake superior will remain around 29.9 to 30.0 
inches between a 30.3 inch bermuda high and 29.5 inch low pressure 
near the western shores of hudson bay.




lsz265-050800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 pm edt tue aug 4 2026

.late this afternoon...west winds 10 to 20 knots. waves calm to
2 feet. 
.tonight...west winds 10 to 20 knots backing southwest after
midnight. waves calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots backing east late.
waves calm to 2 feet. 
.wednesday night...south winds 10 to 20 knots. waves calm to
2 feet. 
.thursday...southwest winds 10 to 20 knots backing south by mid
afternoon. waves calm to 2 feet. 
.thursday night...south winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight. waves building to 1 to 3 feet. 
.friday...southwest winds 15 to 25 knots becoming south 10 to
20 knots by mid afternoon. a chance of showers by mid afternoon.
waves subsiding to calm to 2 feet. 
.friday night...west winds 10 to 20 knots increasing to 15 to
25 knots after midnight. a chance of showers. waves calm to
2 feet. 
.saturday...west winds 10 to 20 knots backing southwest. waves
calm to 2 feet. 
.sunday...west winds 10 to 20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 042001
glfls 
expires:202608050800;;623096

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 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...

troughing to 29.9 remains over lake superior tonight before 30.0 
inch ridging returns on wednesday as high pressure builds into the 
great lakes from the northern plains. for the late week and into the 
weekend, pressure over lake superior will remain around 29.9 to 30.0 
inches between a 30.3 inch bermuda high and 29.5 inch low pressure 
near the western shores of hudson bay.




lsz266-050800-
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 tue aug 4 2026

.late this afternoon...west winds 10 to 20 knots. waves 2 to
4 feet. 
.tonight...west winds 5 to 15 knots backing southwest after
midnight. waves subsiding to calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots backing east late.
waves calm to 2 feet. 
.wednesday night...south winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet. 
.thursday...south winds 10 to 20 knots. waves building to 1 to
3 feet. 
.thursday night...south winds 15 to 25 knots increasing to 20 to
30 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.friday...south winds 15 to 25 knots. a chance of showers by mid
afternoon. waves subsiding to 1 to 3 feet. 
.friday night...southwest winds 10 to 20 knots veering west after
midnight. a chance of showers. waves subsiding to calm to 2 feet.
.saturday...west winds 10 to 20 knots becoming southwest 5 to
15 knots. waves calm to 2 feet. 
.sunday...west winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 042001
glfls 
expires:202608050800;;623097

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 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...

troughing to 29.9 remains over lake superior tonight before 30.0 
inch ridging returns on wednesday as high pressure builds into the 
great lakes from the northern plains. for the late week and into the 
weekend, pressure over lake superior will remain around 29.9 to 30.0 
inches between a 30.3 inch bermuda high and 29.5 inch low pressure 
near the western shores of hudson bay.




lsz267-050800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 pm edt tue aug 4 2026

.late this afternoon...west winds 5 to 15 knots. a chance of
showers and a slight chance of thunderstorms. waves calm to
2 feet. 
.tonight...southwest winds 5 to 15 knots backing south after
midnight. a slight chance of showers. patchy fog after midnight.
waves calm to 2 feet. 
.wednesday...west winds 5 to 15 knots veering north late. waves
calm to 2 feet. 
.wednesday night...south winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...south winds 5 to 15 knots. waves calm to 2 feet. 
.thursday night...south winds 15 to 25 knots. waves building to
2 to 4 feet. 
.friday...south winds 10 to 20 knots. waves subsiding to calm to
2 feet. 
.friday night...south winds 10 to 20 knots veering west after
midnight. a chance of showers. waves building to 1 to 3 feet,
then subsiding to calm to 2 feet. 
.saturday...west winds 5 to 15 knots backing southwest. waves
calm to 2 feet. 
.sunday...west winds 5 to 15 knots. waves calm to 2 feet. 

$$