fzus63 kdtx 091957
glflh 
expires:202608100400;;898316

open lake forecast for lake huron
national weather service detroit/pontiac mi
357 pm edt sun aug 9 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...this evening through early next week an active pattern
with a stalled frontal boundary draped over the southern great
lakes region brings back chances for organized thunderstorms to
the region. by the end of next week, high pressure around 30.1
inches builds south from central canada.


lhz361-100400-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
357 pm edt sun aug 9 2026

.tonight...east winds 5 to 10 knots early in the evening becoming
light and variable. a chance of showers in the evening. waves
2 feet or less. 
.monday...west winds 5 to 10 knots. waves 2 feet or less. 
.monday night...west winds 5 to 10 knots  becoming light and
variable. waves 2 feet or less. 
.tuesday...light and variable winds. waves 2 feet or less. 
.tuesday night...east winds 5 to 10 knots early in the evening
becoming light and variable. waves 2 feet or less. 
.wednesday...northwest winds 5 to 10 knots in the morning
becoming light and variable...then becoming northwest 5 to
10 knots late in the afternoon increasing to 10 to 15 knots. a
chance of showers in the morning. waves 2 feet or less. 
.thursday...northwest winds 10 to 15 knots decreasing to 5 to
10 knots in the late morning and early afternoon...then
increasing to 15 to 20 knots early in the evening decreasing to
10 to 15 knots by midnight. waves 1 to 3 feet building to 3 to
5 feet . 
.friday...northwest winds 5 to 10 knots. waves 1 to 3 feet. 


$$

fzus63 kdtx 091957
glflh 
expires:202608100400;;898317

open lake forecast for lake huron
national weather service detroit/pontiac mi
357 pm edt sun aug 9 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...this evening through early next week an active pattern
with a stalled frontal boundary draped over the southern great
lakes region brings back chances for organized thunderstorms to
the region. by the end of next week, high pressure around 30.1
inches builds south from central canada.


lhz362-363-100400-
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-
357 pm edt sun aug 9 2026

.tonight...southeast winds 10 to 15 knots becoming east 5 to
10 knots in the late evening and overnight. a chance of showers
in the evening. waves 2 to 4 feet subsiding to 1 to 3 feet in the
late evening and overnight. 
.monday...northwest winds 5 to 10 knots. waves 2 feet or less. 
.monday night...north winds 5 to 10 knots backing to the
northwest after midnight. waves 1 to 3 feet. 
.tuesday...light and variable winds. waves 2 feet or less. 
.tuesday night...east winds 5 to 10 knots early in the evening
becoming light and variable. waves 2 feet or less. 
.wednesday...light and variable winds becoming north 5 to
10 knots late in the afternoon...then backing to the northwest
late in the evening. a chance of showers late in the morning.
waves 2 feet or less. 
.thursday...northwest winds 10 to 15 knots. waves 1 to 3 feet
building to 4 to 6 feet . waves occasionally around 8 feet. 
.friday...north winds 5 to 10 knots. waves 3 to 5 feet subsiding
to 1 to 3 feet. 


$$

fzus63 kdtx 091957
glflh 
expires:202608100400;;898318

open lake forecast for lake huron
national weather service detroit/pontiac mi
357 pm edt sun aug 9 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...this evening through early next week an active pattern
with a stalled frontal boundary draped over the southern great
lakes region brings back chances for organized thunderstorms to
the region. by the end of next week, high pressure around 30.1
inches builds south from central canada.


lhz462>464-100400-
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-
357 pm edt sun aug 9 2026

.tonight...south winds 10 to 15 knots veering to the west early
in the morning. a chance of showers. waves 1 to 3 feet. 
.monday...west winds 5 to 10 knots. waves 2 feet or less. 
.monday night...north winds 5 to 10 knots early in the evening
becoming light and variable. waves 2 feet or less. 
.tuesday...light and variable winds becoming northeast 5 to
10 knots early in the afternoon. waves 2 feet or less. 
.tuesday night...east winds 5 to 10 knots veering to the
southeast in the late evening and overnight. waves 2 feet or
less. 
.wednesday...south winds 5 to 10 knots. a chance of showers.
waves 2 feet or less. 
.thursday...northwest winds 10 to 15 knots. waves 1 to 3 feet
building to 2 to 4 feet by midnight. 
.friday...north winds 5 to 10 knots. waves 2 to 4 feet subsiding
to 1 to 3 feet . 


$$

fzus63 kmkx 092033
glflm 
expires:202608100315;;900358

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
333 pm cdt sun aug 9 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...

winds will become light and mostly variable ahead of a sagging 
front. the front will move southward down the lake into monday, 
leading to light northerly winds through the morning on monday and
light and variable winds monday afternoon and evening. light and 
variable winds then persist into tuesday as high pressure of 30.0 
inches remains in place north of a frontal boundary parked over 
the corn belt. otherwise an unsettled weather pattern has set up 
over the upper great lakes this week where weak waves of low 
pressure will cross the region and produce rounds of thunderstorms
at times primarily a risk for the south half. the first round of 
weakening storms should arrive late morning and early afternoon, 
and additional storms are possible there sunday night and beyond.


lmz080-669-671-673-675-777-779-870-872-874-876-878-100315-
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-
333 pm cdt sun aug 9 2026

sheboygan wi to pentwater mi south...

.tonight...south winds 10 to 15 kt increasing to 15 to 25 kt late
this evening, then diminishing to 10 to 20 kt after midnight
becoming southwest late. chance of showers and thunderstorms this
evening, then showers likely with a chance of thunderstorms
overnight. patchy fog overnight. waves 1 to 3 ft.
.monday...northwest winds 10 to 15 kt veering to northeast.
patchy fog in the morning. slight chance of showers and
thunderstorms in the afternoon. waves 1 to 3 ft subsiding to 1 to
2 ft. 
.monday night...northeast winds 5 to 10 kt becoming east. waves
1 ft or less. 
.tuesday...southeast winds 10 to 15 kt. chance of showers. waves
1 to 2 ft. 
.tuesday night...northeast winds 5 to 10 kt. chance of showers.
waves 1 ft or less. 
.wednesday...north winds 5 to 10 kt becoming northwest 10 to
15 kt. chance of showers in the morning. waves 1 ft or less.
.wednesday night...north winds 10 to 15 kt. waves 1 to 2 ft.
.thursday...north winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft. 
.friday...northeast winds 10 to 15 kt becoming north 10 to 20 kt.
waves 1 to 3 ft.  

$$

fzus63 kmkx 092033
glflm 
expires:202608100315;;900357

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
333 pm cdt sun aug 9 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...

winds will become light and mostly variable ahead of a sagging 
front. the front will move southward down the lake into monday, 
leading to light northerly winds through the morning on monday and
light and variable winds monday afternoon and evening. light and 
variable winds then persist into tuesday as high pressure of 30.0 
inches remains in place north of a frontal boundary parked over 
the corn belt. otherwise an unsettled weather pattern has set up 
over the upper great lakes this week where weak waves of low 
pressure will cross the region and produce rounds of thunderstorms
at times primarily a risk for the south half. the first round of 
weakening storms should arrive late morning and early afternoon, 
and additional storms are possible there sunday night and beyond.


lmz261-362-364-366-563-565-567-868-100315-
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-
333 pm cdt sun aug 9 2026

sheboygan wi to pentwater mi north...

.tonight...southwest winds 10 to 20 kt diminishing to 10 to 15 kt
late this evening, then diminishing to 5 to 10 kt after midnight
becoming west late. patchy fog overnight. slight chance of
showers overnight. waves 2 to 4 ft subsiding to 1 to 2 ft. 
.monday...northwest winds 10 to 15 kt backing to south. patchy
fog in the morning. waves 1 to 2 ft. 
.monday night...south winds 10 to 15 kt becoming southeast. waves
1 to 2 ft. 
.tuesday...south winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 ft or less. 
.tuesday night...north winds 5 to 10 kt. chance of showers
overnight. waves 1 ft or less. 
.wednesday...northwest winds 5 to 10 kt becoming north 10 to
20 kt in the afternoon. waves 1 ft or less. 
.wednesday night...north winds 10 to 15 kt. waves 1 to 2 ft.
.thursday...north winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft. 
.friday...north winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 2 ft.  

$$

fzus63 kmkx 091714
glflm 
expires:202608100300;;890578

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
1213 pm cdt sun aug 9 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...

winds today will be southerly and breezy, then grow light and
variable for a time tonight ahead of a cold front. the front will
move southward down the lake into monday, leading to light
northerly winds through the morning on monday and light and
variable winds monday afternoon and evening. light and variable
winds then persist into tuesday as high pressure of 30.0 inches
remains in place north of a frontal boundary parked over the corn
belt. otherwise an unsettled weather pattern has set up over the 
upper great lakes this week where weak waves of low pressure will
cross the region and produce rounds of thunderstorms at times
primarily a risk for the south half. the first round of weakening
storms should arrive late morning and early afternoon, and 
additional storms are possible there sunday night and beyond.


lmz669-671-673-675-777-100300-
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-
1213 pm cdt sun aug 9 2026

sheboygan wi to pentwater mi south to wilmette harbor il to st.
joseph mi...

...severe thunderstorm watch 546 in effect until 2 pm cdt this
afternoon...

.tonight...south winds 10 to 20 kt becoming west. chance of
showers and thunderstorms. patchy fog overnight. waves 2 to 4 ft
subsiding to 1 to 3 ft. 
.monday...northwest winds 10 to 15 kt becoming northeast. patchy
dense fog in the morning. waves 1 to 2 ft. 
.monday night...northeast winds 5 to 10 kt. chance of showers.
waves 1 ft or less. 
.tuesday...east winds 5 to 10 kt becoming northeast 10 to 15 kt.
chance of showers. waves 1 ft or less. 
.tuesday night...northeast winds 5 to 10 kt. chance of showers
and thunderstorms. waves 1 ft or less. 
.wednesday...north winds 5 to 10 kt becoming northwest 10 to
15 kt. waves 1 ft or less. 
.thursday...north winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft.  

$$

fzus63 kmkx 091714
glflm 
expires:202608100300;;890579

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
1213 pm cdt sun aug 9 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...

winds today will be southerly and breezy, then grow light and
variable for a time tonight ahead of a cold front. the front will
move southward down the lake into monday, leading to light
northerly winds through the morning on monday and light and
variable winds monday afternoon and evening. light and variable
winds then persist into tuesday as high pressure of 30.0 inches
remains in place north of a frontal boundary parked over the corn
belt. otherwise an unsettled weather pattern has set up over the 
upper great lakes this week where weak waves of low pressure will
cross the region and produce rounds of thunderstorms at times
primarily a risk for the south half. the first round of weakening
storms should arrive late morning and early afternoon, and 
additional storms are possible there sunday night and beyond.


lmz080-779-870-872-874-876-878-100300-
lake michigan from michigan city in to st. joseph mi 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-
1213 pm cdt sun aug 9 2026

wilmette harbor il to st. joseph mi south...

.tonight...south winds 10 to 20 kt becoming west. chance of
showers and thunderstorms. patchy fog overnight. waves 2 to 4 ft
subsiding to 1 to 3 ft. 
.monday...northwest winds 10 to 15 kt becoming northeast. patchy
dense fog in the morning. waves 1 to 2 ft. 
.monday night...northeast winds 5 to 10 kt. chance of showers.
waves 1 ft or less. 
.tuesday...east winds 5 to 10 kt becoming northeast 10 to 15 kt.
chance of showers. waves 1 ft or less. 
.tuesday night...northeast winds 5 to 10 kt. chance of showers
and thunderstorms. waves 1 ft or less. 
.wednesday...north winds 5 to 10 kt becoming northwest 10 to
15 kt. waves 1 ft or less. 
.thursday...north winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft.  

$$

fzus63 kmqt 092002
glfls 
expires:202608100800;;898502

open lake forecast for lake superior
national weather service marquette mi
402 pm edt sun aug 9 2026

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

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

.synopsis...

a 29.9 inch trough moves over the lake through tonight. then, weak 
ridging of 29.9 inches returns on monday and holds through tuesday. 
another weak trough at 29.8 inches moves over the lake tuesday night 
into wednesday before high pressure gradually builds over the great 
lakes from western canada through friday to 30.1 inches.




lsz264-100800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
402 pm edt sun aug 9 2026

.late this afternoon...south winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...south winds less than 10 knots veering west late.
patchy fog through midnight, then areas of dense fog after
midnight. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots backing southwest in the
afternoon. patchy fog. waves calm to 2 feet. 
.monday night...southwest winds 5 to 15 knots veering west late.
waves calm to 2 feet. 
.tuesday...west winds less than 10 knots backing south by mid
afternoon. a slight chance of showers through early afternoon.
waves calm to 2 feet. 
.tuesday night...southwest winds less than 10 knots veering west
after midnight. waves calm to 2 feet. 
.wednesday...west winds less than 10 knots. waves calm to 2 feet.
.wednesday night...northwest winds less than 10 knots increasing
to 5 to 15 knots after midnight. waves calm to 2 feet. 
.thursday...west winds 5 to 15 knots. waves calm to 2 feet. 
.friday...northwest winds less than 10 knots backing south. waves
calm to 2 feet. 

$$

fzus63 kmqt 092002
glfls 
expires:202608100800;;898503

open lake forecast for lake superior
national weather service marquette mi
402 pm edt sun aug 9 2026

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

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

.synopsis...

a 29.9 inch trough moves over the lake through tonight. then, weak 
ridging of 29.9 inches returns on monday and holds through tuesday. 
another weak trough at 29.8 inches moves over the lake tuesday night 
into wednesday before high pressure gradually builds over the great 
lakes from western canada through friday to 30.1 inches.




lsz265-100800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
402 pm edt sun aug 9 2026

.late this afternoon...east winds 10 to 20 knots. a slight chance
of showers. waves calm to 2 feet. 
.tonight...east winds 5 to 15 knots backing north after midnight,
then backing west late. a slight chance of showers through
midnight. patchy fog after midnight. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots backing east late. waves calm
to 2 feet. 
.monday night...south winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. waves calm to 2 feet. 
.tuesday...southwest winds 5 to 15 knots backing east by mid
afternoon. a slight chance of showers. waves calm to 2 feet. 
.tuesday night...southeast winds 5 to 15 knots veering west after
midnight. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots veering northwest by mid
afternoon. 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 west. waves
calm to 2 feet. 
.friday...northeast winds 5 to 15 knots veering south. waves calm
to 2 feet. 

$$

fzus63 kmqt 092002
glfls 
expires:202608100800;;898504

open lake forecast for lake superior
national weather service marquette mi
402 pm edt sun aug 9 2026

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

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

.synopsis...

a 29.9 inch trough moves over the lake through tonight. then, weak 
ridging of 29.9 inches returns on monday and holds through tuesday. 
another weak trough at 29.8 inches moves over the lake tuesday night 
into wednesday before high pressure gradually builds over the great 
lakes from western canada through friday to 30.1 inches.




lsz266-100800-
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-
402 pm edt sun aug 9 2026

.late this afternoon...east winds 5 to 15 knots. a slight chance
of showers. waves calm to 2 feet. 
.tonight...east winds 5 to 15 knots backing north after midnight.
a slight chance of showers through midnight. patchy fog. waves
calm to 2 feet. 
.monday...west winds 5 to 15 knots. patchy fog through early
afternoon. waves calm to 2 feet. 
.monday night...southwest winds 5 to 15 knots backing south after
midnight. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots. a slight chance of showers.
waves calm to 2 feet. 
.tuesday night...south winds 5 to 15 knots veering west after
midnight. waves calm to 2 feet. 
.wednesday...west winds 5 to 15 knots veering northwest by mid
afternoon. 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. waves calm to 2 feet. 
.friday...northwest winds 5 to 15 knots backing south. waves calm
to 2 feet. 

$$

fzus63 kmqt 092002
glfls 
expires:202608100800;;898505

open lake forecast for lake superior
national weather service marquette mi
402 pm edt sun aug 9 2026

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

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

.synopsis...

a 29.9 inch trough moves over the lake through tonight. then, weak 
ridging of 29.9 inches returns on monday and holds through tuesday. 
another weak trough at 29.8 inches moves over the lake tuesday night 
into wednesday before high pressure gradually builds over the great 
lakes from western canada through friday to 30.1 inches.




lsz267-100800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
402 pm edt sun aug 9 2026

.late this afternoon...east winds 10 to 20 knots. waves calm to
2 feet. 
.tonight...northeast winds 5 to 15 knots backing north late. a
slight chance of showers through midnight. patchy fog. waves calm
to 2 feet. 
.monday...northwest winds 5 to 15 knots backing west in the
afternoon, then veering northwest late. patchy fog through early
afternoon. waves calm to 2 feet. 
.monday night...west winds 5 to 15 knots backing south after
midnight. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots backing east by mid
afternoon. a slight chance of showers through early afternoon.
waves calm to 2 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.wednesday...northwest winds 5 to 15 knots. waves calm to 2 feet.
.wednesday night...northwest winds 10 to 20 knots. waves calm to
2 feet. 
.thursday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves calm to 2 feet. 
.friday...northwest winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 092002
glfls 
expires:202608100800;;898501

open lake forecast for lake superior
national weather service marquette mi
402 pm edt sun aug 9 2026

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

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

.synopsis...

a 29.9 inch trough moves over the lake through tonight. then, weak 
ridging of 29.9 inches returns on monday and holds through tuesday. 
another weak trough at 29.8 inches moves over the lake tuesday night 
into wednesday before high pressure gradually builds over the great 
lakes from western canada through friday to 30.1 inches.




lsz263-100800-
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-
402 pm edt sun aug 9 2026

.late this afternoon...east winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...east winds 5 to 15 knots becoming west less than
10 knots after midnight, then increasing to 5 to 15 knots late.
patchy fog. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots backing southwest in the
afternoon, then increasing to 10 to 20 knots late. patchy fog
through early afternoon. waves calm to 2 feet. 
.monday night...southwest winds 5 to 15 knots veering west after
midnight, then diminishing to less than 10 knots late. a slight
chance of showers after midnight. waves calm to 2 feet. 
.tuesday...north winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. a slight chance of showers through
early afternoon. waves calm to 2 feet. 
.tuesday night...southwest winds 5 to 15 knots becoming west less
than 10 knots after midnight. a chance of showers. waves calm to
2 feet. 
.wednesday...west winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...southwest winds 5 to 15 knots veering west. waves
calm to 2 feet. 
.friday...north winds 5 to 15 knots veering south. waves calm to
2 feet. 

$$

fzus63 kmqt 092002
glfls 
expires:202608100800;;898500

open lake forecast for lake superior
national weather service marquette mi
402 pm edt sun aug 9 2026

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

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

.synopsis...

a 29.9 inch trough moves over the lake through tonight. then, weak 
ridging of 29.9 inches returns on monday and holds through tuesday. 
another weak trough at 29.8 inches moves over the lake tuesday night 
into wednesday before high pressure gradually builds over the great 
lakes from western canada through friday to 30.1 inches.




lsz162-100800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
402 pm edt sun aug 9 2026 /302 pm cdt sun aug 9 2026/

.late this afternoon...east winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...south winds 5 to 15 knots veering west after midnight.
patchy fog. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots backing southwest in the
afternoon, then becoming south 10 to 20 knots late. waves calm to
2 feet. 
.monday night...south winds 5 to 15 knots backing north after
midnight. a slight chance of thunderstorms through midnight. a
slight chance of showers. waves calm to 2 feet. 
.tuesday...north winds 5 to 15 knots veering south by mid
afternoon. a slight chance of showers through early afternoon.
waves calm to 2 feet. 
.tuesday night...northwest winds 5 to 15 knots. a chance of
showers. waves calm to 2 feet. 
.wednesday...west winds 5 to 15 knots. waves calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots backing northwest
after midnight. waves calm to 2 feet. 
.thursday...north winds 5 to 15 knots. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots backing northeast. waves calm
to 2 feet. 

$$