fzus61 kbuf 040803
glflo 
expires:202608041500;;596447

open lake forecast for lake ontario
national weather service buffalo ny
403 am 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 ridge averaging 30.0 inches builds eastward across the 
lake ontario region today and then exit slowly toward new england 
through saturday. a cold front should approach lake ontario slowly 
from the northwest thursday through saturday.


loz063>065-041500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt tue aug 4 2026

.today...west winds 5 to 10 knots becoming north. waves 2 feet or
less. 
.tonight...east winds 10 knots or less becoming south. waves
1 foot or less. 
.wednesday...south winds 5 to 15 knots becoming east less than
10 knots. waves 2 feet or less. 
.wednesday night...southeast winds 10 knots or less 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 and thunderstorms. waves 1 foot or less. 
.friday...west winds 10 knots or less becoming southwest. a
chance of showers and thunderstorms. waves 1 foot or less. 
.saturday...southwest winds 5 to 10 knots. a chance of showers
and thunderstorms during the day. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 040803
glflo 
expires:202608041500;;596446

open lake forecast for lake ontario
national weather service buffalo ny
403 am 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 ridge averaging 30.0 inches builds eastward across the 
lake ontario region today and then exit slowly toward new england 
through saturday. a cold front should approach lake ontario slowly 
from the northwest thursday through saturday.


loz062-041500-
lake ontario open waters from the niagara river to hamlin beach-
403 am edt tue aug 4 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 041315
glfle 
expires:202608042015;;608133

open lake forecast for lake erie
national weather service cleveland oh
915 am 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 cross lake erie thursday and friday before
stalling just east of the lakes on saturday.


lez061-165>169-042015-
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-
915 am edt tue aug 4 2026

.this afternoon...southwest winds less than 10 knots becoming
northeast. waves 1 foot or less. 
.tonight...northeast winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.wednesday...south winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.wednesday night...southeast winds 10 knots or less becoming
south. waves 1 foot or less. 
.thursday...southwest winds 10 knots or less. showers likely with
a chance of thunderstorms thursday night. waves 1 foot or less. 
.friday...southwest winds 5 to 10 knots. a chance of showers and
thunderstorms. waves 1 foot or less. 
.saturday...southwest winds 5 to 15 knots. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 041315
glfle 
expires:202608042015;;608132

open lake forecast for lake erie
national weather service cleveland oh
915 am 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 cross lake erie thursday and friday before
stalling just east of the lakes on saturday.


lez162>164-042015-
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-
915 am edt tue aug 4 2026

.this afternoon...south winds less than 10 knots becoming east.
waves 1 foot or less. 
.tonight...east winds less than 10 knots. waves 1 foot or less. 
.wednesday...light and variable winds. waves 1 foot or less. 
.wednesday night...southeast winds 10 knots or less becoming
southwest. waves 1 foot or less. 
.thursday...southwest winds 5 to 10 knots. a chance of showers
and thunderstorms during the day, then showers likely with a
chance of thunderstorms thursday night. waves 1 foot or less. 
.friday...southwest winds 10 knots or less. a chance of showers
and thunderstorms friday night. waves 1 foot or less. 
.saturday...southwest winds 5 to 10 knots. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 041326
glfsc 
expires:202608042130;;608246

lake st clair forecast
national weather service detroit/pontiac mi
926 am 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, will retreat across the
eastern great lakes toward the mid atlantic today and tonight. a
slow moving cold front, 29.90 inches, will move from the western
great lakes wednesday to the eastern great lakes thursday
afternoon and thursday night. this front will trigger showers and
a chance of thunderstorms across the region. a weak south-
southwest flow will then take hold across the region friday into
saturday.


lcz460-042130-
lake st clair-
926 am edt tue aug 4 2026

.rest of today...south winds 5 to 10 knots. sunny. waves 2 feet or
less.
.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 late morning and afternoon. sunny. waves 2 feet or less.
.wednesday night...southwest winds 5 to 10 knots. mostly clear.
waves 2 feet or less.
.thursday...southwest winds 5 to 10 knots backing to the south in
the evening. partly sunny becoming mostly cloudy. a chance of light
showers. a chance of thunderstorms in the afternoon and evening.
light showers likely in the evening. waves 2 feet or less.
.friday...south winds 5 to 10 knots. partly cloudy. light showers
likely and a chance of thunderstorms. waves 2 feet or less.
.saturday...southwest winds 5 to 10 knots. mostly clear. waves 2
feet or less.

$$

fzus63 kdtx 041325
glflh 
expires:202608042130;;608240

open lake forecast for lake huron
national weather service detroit/pontiac mi
925 am 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, will retreat across the
eastern great lakes toward the mid atlantic today and tonight. a
slow moving cold front, 29.90 inches, will move from the western
great lakes wednesday to the eastern great lakes thursday
afternoon and thursday night. this front will trigger showers and
a chance of thunderstorms across the region. a weak south-
southwest flow will then take hold across the region friday into
saturday.


lhz462>464-042130-
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-
925 am edt tue aug 4 2026

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


$$

fzus63 kdtx 041325
glflh 
expires:202608042130;;608238

open lake forecast for lake huron
national weather service detroit/pontiac mi
925 am 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, will retreat across the
eastern great lakes toward the mid atlantic today and tonight. a
slow moving cold front, 29.90 inches, will move from the western
great lakes wednesday to the eastern great lakes thursday
afternoon and thursday night. this front will trigger showers and
a chance of thunderstorms across the region. a weak south-
southwest flow will then take hold across the region friday into
saturday.


lhz361-042130-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
925 am edt tue aug 4 2026

.rest of today...south winds 5 to 10 knots backing to the
southeast late in the afternoon. waves 2 feet or less building to
2 to 4 feet late in the afternoon. 
.tonight...light and variable winds becoming north 5 to 10 knots
early in the morning. a chance of showers after midnight. waves
3 to 5 feet subsiding to 1 to 3 feet early in the morning. 
.wednesday...light and variable winds becoming southwest 5 to
10 knots early in the afternoon. a chance of showers. 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 becoming south 5 to 10 knots
late in the evening. waves 2 feet or less. 
.friday...southwest winds 5 to 10 knots backing to the east early
in the evening...then veering to the south by midnight. waves
2 feet or less. 
.saturday...southwest winds 5 to 10 knots becoming light and
variable. a chance of showers by midnight. waves 2 feet or less. 


$$

fzus63 kdtx 041325
glflh 
expires:202608042130;;608239

open lake forecast for lake huron
national weather service detroit/pontiac mi
925 am 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, will retreat across the
eastern great lakes toward the mid atlantic today and tonight. a
slow moving cold front, 29.90 inches, will move from the western
great lakes wednesday to the eastern great lakes thursday
afternoon and thursday night. this front will trigger showers and
a chance of thunderstorms across the region. a weak south-
southwest flow will then take hold across the region friday into
saturday.


lhz362-363-042130-
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-
925 am edt tue aug 4 2026

.rest of today...south winds 10 to 15 knots. waves 1 to 3 feet
building to 3 to 5 feet late in the afternoon. waves occasionally
around 6 feet. 
.tonight...south winds 10 to 15 knots becoming southwest 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 1 to 3 feet. 
.wednesday night...south winds 5 to 10 knots early in the evening
becoming light and variable. a chance of showers in the evening...
then showers likely after midnight. waves 2 feet or less. 
.thursday...light and variable winds. a chance of showers. waves
2 feet or less. 
.friday...light and variable winds becoming south 5 to 10 knots .
waves 2 feet or less. 
.saturday...southwest winds 5 to 10 knots becoming south 10 to
15 knots early in the evening...then decreasing to 5 to 10 knots
by midnight. a chance of showers by midnight. waves 1 to 3 feet. 


$$

fzus63 kmkx 041249
glflm 
expires:202608042130;;607151

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
749 am 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 over lake erie this morning,
resulting in generally southerly winds across the open waters. a
cold front is moving into the northern mississippi river valley,
and will approach lake michigan into this 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.


lmz261-362-364-366-563-565-567-868-042130-
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-
749 am cdt tue aug 4 2026

sheboygan wi to pentwater mi north...

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

$$

fzus63 kmkx 041249
glflm 
expires:202608042130;;607152

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
749 am 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 over lake erie this morning,
resulting in generally southerly winds across the open waters. a
cold front is moving into the northern mississippi river valley,
and will approach lake michigan into this 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.


lmz080-669-671-673-675-777-779-870-872-874-876-878-042130-
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-
749 am cdt tue aug 4 2026

sheboygan wi to pentwater mi south...

.rest of today...south winds 10 to 20 kt increasing to 15 to
25 kt. waves 3 to 5 ft. 
.tonight...south winds 15 to 25 kt diminishing to 10 to 20 kt
late in the evening, then becoming southwest 10 to 15 kt
overnight. chance of showers and slight chance of thunderstorms
in the evening, then showers likely with a chance of
thunderstorms overnight. waves 3 to 5 ft subsiding to 2 to 4 ft. 
.wednesday...west winds 10 to 15 kt becoming southwest 5 to
10 kt. chance of showers in the morning. waves 1 to 3 ft. 
.wednesday night...east winds 5 to 10 kt veering to west. showers
with a chance of thunderstorms in the evening, then chance of
showers and thunderstorms overnight. waves 1 to 2 ft.
.thursday...north winds 5 to 10 kt increasing to 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.
waves 1 to 2 ft. 
.saturday...southwest winds 10 to 20 kt becoming south. waves
1 to 3 ft.  

$$

fzus63 kmqt 040801
glfls 
expires:202608042000;;596360

open lake forecast for lake superior
national weather service marquette mi
401 am 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...

a 29.8 inch trough tracks across the lake today as a 29.4 inch low 
moves over hudson bay. 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, lake superior will be 
between a 30.3 inch bermuda high and a 29.6 inch low pressure around 
western hudson bay.




lsz265-042000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 am edt tue aug 4 2026

.early this morning...south winds 15 to 25 knots. waves 1 to
3 feet. 
.today...south winds 15 to 25 knots veering west in the
afternoon, then diminishing to 10 to 20 knots late. a slight
chance of showers. waves subsiding to calm to 2 feet. 
.tonight...west winds 10 to 20 knots. waves calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest in the
afternoon, then backing southeast late. waves calm to 2 feet. 
.wednesday night...south winds 10 to 20 knots. waves calm to
2 feet. 
.thursday...south winds 10 to 20 knots backing southeast by mid
afternoon. waves calm to 2 feet. 
.thursday night...south winds 15 to 25 knots veering southwest
after midnight. waves building to 1 to 3 feet. 
.friday...southwest winds 10 to 20 knots. waves subsiding to calm
to 2 feet. 
.saturday...west winds 10 to 20 knots. a chance of showers. waves
calm to 2 feet. 

$$

fzus63 kmqt 040801
glfls 
expires:202608042000;;596359

open lake forecast for lake superior
national weather service marquette mi
401 am 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...

a 29.8 inch trough tracks across the lake today as a 29.4 inch low 
moves over hudson bay. 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, lake superior will be 
between a 30.3 inch bermuda high and a 29.6 inch low pressure around 
western hudson bay.




lsz264-042000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 am edt tue aug 4 2026

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

$$

fzus63 kmqt 040801
glfls 
expires:202608042000;;596358

open lake forecast for lake superior
national weather service marquette mi
401 am 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...

a 29.8 inch trough tracks across the lake today as a 29.4 inch low 
moves over hudson bay. 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, lake superior will be 
between a 30.3 inch bermuda high and a 29.6 inch low pressure around 
western hudson bay.




lsz263-042000-
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 am edt tue aug 4 2026

.early this morning...southwest winds 15 to 25 knots. a chance of
showers and a slight chance of thunderstorms. waves 2 to 4 feet. 
.today...west winds 15 to 25 knots diminishing to 10 to 20 knots
in the afternoon, then backing southwest late. a chance of
showers through early afternoon. 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...west winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. waves building to 1 to 3 feet. 
.wednesday night...south winds 5 to 15 knots veering southwest
after midnight. waves subsiding to calm to 2 feet. 
.thursday...southwest winds 15 to 25 knots. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 
.thursday night...south winds 10 to 20 knots veering southwest
after midnight. waves building to 2 to 4 feet. 
.friday...southwest winds 15 to 25 knots diminishing to 5 to
15 knots. a chance of showers. waves subsiding to calm to 2 feet.
.saturday...southwest winds 10 to 20 knots becoming west 5 to
15 knots. a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 040801
glfls 
expires:202608042000;;596357

open lake forecast for lake superior
national weather service marquette mi
401 am 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...

a 29.8 inch trough tracks across the lake today as a 29.4 inch low 
moves over hudson bay. 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, lake superior will be 
between a 30.3 inch bermuda high and a 29.6 inch low pressure around 
western hudson bay.




lsz162-042000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt tue aug 4 2026 /301 am cdt tue aug 4 2026/

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

$$

fzus63 kmqt 040801
glfls 
expires:202608042000;;596361

open lake forecast for lake superior
national weather service marquette mi
401 am 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...

a 29.8 inch trough tracks across the lake today as a 29.4 inch low 
moves over hudson bay. 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, lake superior will be 
between a 30.3 inch bermuda high and a 29.6 inch low pressure around 
western hudson bay.




lsz266-042000-
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 am edt tue aug 4 2026

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

$$

fzus63 kmqt 040801
glfls 
expires:202608042000;;596362

open lake forecast for lake superior
national weather service marquette mi
401 am 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...

a 29.8 inch trough tracks across the lake today as a 29.4 inch low 
moves over hudson bay. 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, lake superior will be 
between a 30.3 inch bermuda high and a 29.6 inch low pressure around 
western hudson bay.




lsz267-042000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 am edt tue aug 4 2026

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

$$