fzus63 kdtx 231938
glflh 
expires:202608240345;;241033

open lake forecast for lake huron
national weather service detroit/pontiac mi
338 pm edt sun aug 23 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...post-frontal northwest flow brings breezy conditions
through monday. chances for some rain showers and an isolated
thunderstorm will return this evening and overnight, favored
across lake huron, high pressure, 30.10 inches, will move over
the great lakes late tomorrow into tuesday.


lhz361-240345-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
338 pm edt sun aug 23 2026

.tonight...northwest winds 20 to 25 knots with gusts to 35 knot
gales. a chance of showers. waves 6 to 9 feet. waves occasionally
around 12 feet. 
.monday...northwest winds 20 to 25 knots with gusts to around
30 knots decreasing to 15 to 20 knots with gusts to around
30 knots in the afternoon. waves 6 to 9 feet. waves occasionally
around 12 feet. 
.monday night...northwest winds 10 to 15 knots decreasing to 5 to
10 knots after midnight. waves 4 to 6 feet subsiding to 2 to
4 feet after midnight. waves occasionally around 8 feet. 
.tuesday...northwest winds 5 to 10 knots until late afternoon
becoming light and variable. waves 2 feet or less. 
.tuesday night...light and variable winds becoming south 5 to
10 knots in the late evening and overnight. waves 2 feet or less.
.wednesday...south winds 10 to 15 knots becoming southeast 5 to
10 knots late in the afternoon...then veering to the south late
in the evening. showers and a chance of thunderstorms. waves 1 to
3 feet building to 3 to 5 feet late in the afternoon. 
.thursday...west winds 10 to 15 knots increasing to 15 to
20 knots early in the evening...then becoming northwest 10 to
15 knots by midnight. a chance of showers early in the morning.
waves 2 to 4 feet subsiding to 1 to 3 feet in the late morning
and early afternoon...then building to 2 to 4 feet . 
.friday...northwest winds 10 to 15 knots decreasing to 5 to
10 knots. waves 1 to 3 feet. 


$$

fzus63 kdtx 231938
glflh 
expires:202608240345;;241034

open lake forecast for lake huron
national weather service detroit/pontiac mi
338 pm edt sun aug 23 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...post-frontal northwest flow brings breezy conditions
through monday. chances for some rain showers and an isolated
thunderstorm will return this evening and overnight, favored
across lake huron, high pressure, 30.10 inches, will move over
the great lakes late tomorrow into tuesday.


lhz362-363-240345-
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-
338 pm edt sun aug 23 2026

.tonight...northwest winds 20 to 25 knots with gusts to 35 knot
gales. a chance of waterspouts in the evening. a chance of
showers in the evening...then showers likely after midnight.
waves 10 to 14 feet. waves occasionally around 18 feet. 
.monday...northwest winds 20 to 25 knots with gusts to around
30 knots. a chance of showers in the morning. waves 8 to 12 feet.
waves occasionally around 15 feet. 
.monday night...northwest winds 15 to 20 knots decreasing to
10 to 15 knots in the late evening and overnight. waves 6 to
9 feet subsiding to 4 to 6 feet after midnight. waves
occasionally around 12 feet. 
.tuesday...northwest winds 5 to 10 knots until late afternoon
becoming light and variable. waves 2 to 4 feet subsiding to 1 to
3 feet in the late morning and afternoon. 
.tuesday night...southeast winds 5 to 10 knots becoming south
10 to 15 knots after midnight. waves 2 feet or less. 
.wednesday...south winds 10 to 15 knots with gusts to around
30 knots increasing to 15 to 20 knots with gusts to around
30 knots late in the afternoon...then decreasing to 10 to
15 knots late in the evening. a chance of showers. a chance of
thunderstorms late in the afternoon. waves 1 to 3 feet building
to 3 to 5 feet. 
.thursday...southwest winds 10 to 15 knots becoming west 5 to
10 knots in the late morning and early afternoon...then becoming
northwest 10 to 15 knots . waves 2 to 4 feet. 
.friday...northwest winds 10 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet . 


$$

fzus63 kdtx 231938
glflh 
expires:202608240345;;241035

open lake forecast for lake huron
national weather service detroit/pontiac mi
338 pm edt sun aug 23 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...post-frontal northwest flow brings breezy conditions
through monday. chances for some rain showers and an isolated
thunderstorm will return this evening and overnight, favored
across lake huron, high pressure, 30.10 inches, will move over
the great lakes late tomorrow into tuesday.


lhz462>464-240345-
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-
338 pm edt sun aug 23 2026

.tonight...northwest winds 15 to 20 knots with gusts to around
30 knots becoming west 20 to 25 knots with gusts to around
30 knots early in the morning. a chance of showers. waves 8 to
12 feet. waves occasionally around 15 feet. 
.monday...west winds 20 to 25 knots becoming northwest 15 to
20 knots in the afternoon. gusts to 30 knots. a chance of showers
in the morning. waves 8 to 12 feet. waves occasionally around
15 feet. 
.monday night...northwest winds 10 to 15 knots. waves 5 to
7 feet. waves occasionally around 10 feet. 
.tuesday...northwest winds 5 to 10 knots until late afternoon
becoming light and variable. waves 3 to 5 feet subsiding to 1 to
3 feet in the late morning and afternoon. 
.tuesday night...light and variable winds becoming south 5 to
10 knots in the late evening and overnight. waves 2 feet or less.
.wednesday...south winds 10 to 15 knots increasing to 15 to
20 knots late in the afternoon...then decreasing to 10 to
15 knots late in the evening. a chance of showers late in the
morning. a chance of thunderstorms late in the afternoon. rain
showers likely late in the evening. waves 1 to 3 feet building to
3 to 5 feet late in the afternoon. 
.thursday...southwest winds 10 to 15 knots becoming west 5 to
10 knots until early evening...then becoming northwest 10 to
15 knots by midnight. a chance of showers early in the morning.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday...northwest winds 10 to 15 knots becoming north 5 to
10 knots . waves 2 to 4 feet subsiding to 1 to 3 feet . 


$$

fzus63 kmkx 231900
glflm 
expires:202608240315;;239757

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
200 pm cdt sun aug 23 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...

scattered shower chances continue over the northern third of lake 
michigan today, with a few waterspouts possible. 29.7 inch low 
pressure is centered near the ontario-quebec border, resulting in 
breezy northwest winds across the open waters of lake michigan. 
the breezy winds will continue through tonight as the low lingers 
in the same general vicinity. expecting most gusts to remain in 
the 25-30 knot range, though a few gusts approaching gale force 
are possible over the northern third of the lake. given the brief 
& isolated nature of any such gusts, not anticipating the need for
any gale headlines, but will be monitoring trends. 30.1 inch high
pressure will steadily build into the upper mississippi valley 
today, reaching the waters by monday afternoon. the high's arrival
will lead to decreasing winds, with conditions becoming light and
variable by monday evening. 

light and variable winds will continue monday night with high 
pressure lingering in the vicinity. the high will shift east into 
ontario by tuesday, resulting in a south-southwest wind shift across 
the waters. 29.7 inch low pressure will approach from the 
northern great plains tuesday night into wednesday, reinforcing 
the south-southwesterly wind pattern. the low will cross lake 
michigan during the second half of the day wednesday, bringing a 
breezy northwest wind shift. gales are not expected as this 
occurs. showers and thunderstorms will accompany the 
approaching/passing surface low tuesday night into wednesday 
afternoon. it remains too early to tell if any of these storms 
could be severe, with trends being monitored through the beginning
of this week. the next area of 30.1 inch high pressure will 
gradually build toward lake michigan from the northern great 
plains wednesday night through friday, bringing slowly decreasing 
winds.


lmz080-669-671-673-675-777-779-870-872-874-876-878-240315-
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-
200 pm cdt sun aug 23 2026

sheboygan wi to pentwater mi south...

.tonight...north winds 10 to 20 kt becoming northwest. waves 4 to
6 ft occasionally to 8 ft subsiding to 2 to 4 ft. 
.monday...northwest winds 10 to 20 kt becoming north. waves 2 to
4 ft. 
.monday night...northeast winds 10 to 20 kt becoming northwest
5 to 10 kt late in the evening, then becoming west after midnight
becoming west 5 to 10 kt late. waves 2 to 4 ft subsiding to 1 to
2 ft. 
.tuesday...southwest winds 10 to 15 kt becoming south 10 to
20 kt. waves 1 to 2 ft building to 2 to 4 ft. 
.tuesday night...south winds 10 to 20 kt increasing to 15 to
25 kt. waves 3 to 5 ft. 
.wednesday...southwest winds to 30 kt. chance of showers in the
morning, then chance of showers and thunderstorms in the
afternoon. waves 4 to 6 ft occasionally to 8 ft. 
.wednesday night...southwest winds 15 to 25 kt becoming west
10 to 20 kt. waves 4 to 6 ft occasionally to 8 ft subsiding to
2 to 4 ft. 
.thursday...northwest winds 10 to 20 kt becoming north. waves
2 to 4 ft. 
.friday...north winds 10 to 20 kt. waves 2 to 4 ft.  

$$

fzus63 kmkx 231900
glflm 
expires:202608240315;;239756

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
200 pm cdt sun aug 23 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...

scattered shower chances continue over the northern third of lake 
michigan today, with a few waterspouts possible. 29.7 inch low 
pressure is centered near the ontario-quebec border, resulting in 
breezy northwest winds across the open waters of lake michigan. 
the breezy winds will continue through tonight as the low lingers 
in the same general vicinity. expecting most gusts to remain in 
the 25-30 knot range, though a few gusts approaching gale force 
are possible over the northern third of the lake. given the brief 
& isolated nature of any such gusts, not anticipating the need for
any gale headlines, but will be monitoring trends. 30.1 inch high
pressure will steadily build into the upper mississippi valley 
today, reaching the waters by monday afternoon. the high's arrival
will lead to decreasing winds, with conditions becoming light and
variable by monday evening. 

light and variable winds will continue monday night with high 
pressure lingering in the vicinity. the high will shift east into 
ontario by tuesday, resulting in a south-southwest wind shift across 
the waters. 29.7 inch low pressure will approach from the 
northern great plains tuesday night into wednesday, reinforcing 
the south-southwesterly wind pattern. the low will cross lake 
michigan during the second half of the day wednesday, bringing a 
breezy northwest wind shift. gales are not expected as this 
occurs. showers and thunderstorms will accompany the 
approaching/passing surface low tuesday night into wednesday 
afternoon. it remains too early to tell if any of these storms 
could be severe, with trends being monitored through the beginning
of this week. the next area of 30.1 inch high pressure will 
gradually build toward lake michigan from the northern great 
plains wednesday night through friday, bringing slowly decreasing 
winds.


lmz261-362-364-366-563-565-567-868-240315-
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-
200 pm cdt sun aug 23 2026

sheboygan wi to pentwater mi north...

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

$$

fzus63 kmqt 232001
glfls 
expires:202608240800;;241616

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun aug 23 2026

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

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

.synopsis...

this afternoon, a 29.6 inch low is along the quebec/ontario line 
while 30.0 inch high pressure extends from hudson bay to missouri. 
little movement is expected with only a slight weakening of both 
pressure centers through tonight. by monday night, the low weakens 
to 29.8 inches as it fully moves into quebec, allowing the high to 
also weaken to 30.0 inches and settle over the upper great lakes. 
meanwhile, 29.8 inch low pressure moves over lake winnipeg. these 
systems all shift east slowly through wednesday afternoon, when the 
weak high moves over new england as the 29.7 inch low moves over 
lake superior. by thursday afternoon, the low will deepen to 29.6 
inches over western quebec as a 30.2 inch high moves over northern 
manitoba. this high will extend 30.1 inch ridging over lake superior 
friday into the weekend. 




lsz266-240800-
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-
400 pm edt sun aug 23 2026

.late this afternoon...northwest winds 20 to 30 knots. a slight
chance of showers. waves 4 to 7 feet occasionally to 9 feet
subsiding to 3 to 6 feet occasionally to 8 feet. 
.tonight...northwest winds 20 to 30 knots becoming north 15 to
25 knots after midnight. waves 3 to 6 feet occasionally to
8 feet. 
.monday...north winds 15 to 25 knots backing northwest in the
afternoon, then diminishing to 10 to 20 knots late. waves
subsiding to 1 to 3 feet. 
.monday night...northwest winds 5 to 15 knots backing west late.
waves subsiding to calm to 2 feet. 
.tuesday...south winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. a slight chance of showers by mid
afternoon. waves calm to 2 feet. 
.tuesday night...southeast winds 15 to 25 knots veering south
after midnight. a chance of showers through midnight. a chance of
thunderstorms. showers after midnight. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.wednesday...south winds 10 to 20 knots veering west by mid
afternoon. showers through early afternoon. a chance of showers
by mid afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...northwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. waves building to 2 to 4 feet. 
.thursday...northwest winds 20 to 30 knots becoming north 15 to
25 knots. waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 1 to 3 feet. 
.friday...north winds 5 to 15 knots backing west. waves subsiding
to calm to 2 feet. 

$$

fzus63 kmqt 232001
glfls 
expires:202608240800;;241617

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun aug 23 2026

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

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

.synopsis...

this afternoon, a 29.6 inch low is along the quebec/ontario line 
while 30.0 inch high pressure extends from hudson bay to missouri. 
little movement is expected with only a slight weakening of both 
pressure centers through tonight. by monday night, the low weakens 
to 29.8 inches as it fully moves into quebec, allowing the high to 
also weaken to 30.0 inches and settle over the upper great lakes. 
meanwhile, 29.8 inch low pressure moves over lake winnipeg. these 
systems all shift east slowly through wednesday afternoon, when the 
weak high moves over new england as the 29.7 inch low moves over 
lake superior. by thursday afternoon, the low will deepen to 29.6 
inches over western quebec as a 30.2 inch high moves over northern 
manitoba. this high will extend 30.1 inch ridging over lake superior 
friday into the weekend. 




lsz267-240800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 pm edt sun aug 23 2026

.late this afternoon...northwest winds 20 to 30 knots. a slight
chance of showers. waves 4 to 7 feet occasionally to 9 feet. 
.tonight...northwest winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible after midnight,
then becoming north 20 to 30 knots late. a slight chance of
showers through midnight. waves subsiding to 3 to 6 feet
occasionally to 8 feet. 
.monday...north winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. waves subsiding to 2 to 4 feet. 
.monday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.tuesday...southwest winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.tuesday night...south winds 10 to 20 knots increasing to 15 to
25 knots after midnight. a chance of showers through midnight.
showers after midnight. waves building to 2 to 4 feet. 
.wednesday...south winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. showers and a chance of thunderstorms.
waves subsiding to calm to 2 feet. 
.wednesday night...west winds 10 to 20 knots veering northwest
after midnight. a chance of showers. waves calm to 2 feet. 
.thursday...northwest winds 15 to 25 knots becoming north 10 to
20 knots. waves building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.friday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 232001
glfls 
expires:202608240800;;241612

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun aug 23 2026

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

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

.synopsis...

this afternoon, a 29.6 inch low is along the quebec/ontario line 
while 30.0 inch high pressure extends from hudson bay to missouri. 
little movement is expected with only a slight weakening of both 
pressure centers through tonight. by monday night, the low weakens 
to 29.8 inches as it fully moves into quebec, allowing the high to 
also weaken to 30.0 inches and settle over the upper great lakes. 
meanwhile, 29.8 inch low pressure moves over lake winnipeg. these 
systems all shift east slowly through wednesday afternoon, when the 
weak high moves over new england as the 29.7 inch low moves over 
lake superior. by thursday afternoon, the low will deepen to 29.6 
inches over western quebec as a 30.2 inch high moves over northern 
manitoba. this high will extend 30.1 inch ridging over lake superior 
friday into the weekend. 




lsz162-240800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt sun aug 23 2026 /300 pm cdt sun aug 23 2026/

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

$$

fzus63 kmqt 232001
glfls 
expires:202608240800;;241613

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun aug 23 2026

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

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

.synopsis...

this afternoon, a 29.6 inch low is along the quebec/ontario line 
while 30.0 inch high pressure extends from hudson bay to missouri. 
little movement is expected with only a slight weakening of both 
pressure centers through tonight. by monday night, the low weakens 
to 29.8 inches as it fully moves into quebec, allowing the high to 
also weaken to 30.0 inches and settle over the upper great lakes. 
meanwhile, 29.8 inch low pressure moves over lake winnipeg. these 
systems all shift east slowly through wednesday afternoon, when the 
weak high moves over new england as the 29.7 inch low moves over 
lake superior. by thursday afternoon, the low will deepen to 29.6 
inches over western quebec as a 30.2 inch high moves over northern 
manitoba. this high will extend 30.1 inch ridging over lake superior 
friday into the weekend. 




lsz263-240800-
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-
400 pm edt sun aug 23 2026

.late this afternoon...west winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.monday...north winds 5 to 15 knots backing southwest late. waves
calm to 2 feet. 
.monday night...southwest winds 5 to 15 knots backing south late.
waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots backing southeast by mid
afternoon. showers likely and a chance of thunderstorms by mid
afternoon. waves calm to 2 feet. 
.tuesday night...southeast winds 5 to 15 knots veering southwest
after midnight. showers and a chance of thunderstorms. waves calm
to 2 feet. 
.wednesday...west winds 10 to 20 knots. a chance of showers.
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 becoming north 5 to
15 knots. waves calm to 2 feet. 
.friday...north winds 5 to 15 knots veering south. waves calm to
2 feet. 

$$

fzus63 kmqt 232001
glfls 
expires:202608240800;;241614

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun aug 23 2026

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

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

.synopsis...

this afternoon, a 29.6 inch low is along the quebec/ontario line 
while 30.0 inch high pressure extends from hudson bay to missouri. 
little movement is expected with only a slight weakening of both 
pressure centers through tonight. by monday night, the low weakens 
to 29.8 inches as it fully moves into quebec, allowing the high to 
also weaken to 30.0 inches and settle over the upper great lakes. 
meanwhile, 29.8 inch low pressure moves over lake winnipeg. these 
systems all shift east slowly through wednesday afternoon, when the 
weak high moves over new england as the 29.7 inch low moves over 
lake superior. by thursday afternoon, the low will deepen to 29.6 
inches over western quebec as a 30.2 inch high moves over northern 
manitoba. this high will extend 30.1 inch ridging over lake superior 
friday into the weekend. 




lsz264-240800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 pm edt sun aug 23 2026

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

$$

fzus63 kmqt 232001
glfls 
expires:202608240800;;241615

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun aug 23 2026

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

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

.synopsis...

this afternoon, a 29.6 inch low is along the quebec/ontario line 
while 30.0 inch high pressure extends from hudson bay to missouri. 
little movement is expected with only a slight weakening of both 
pressure centers through tonight. by monday night, the low weakens 
to 29.8 inches as it fully moves into quebec, allowing the high to 
also weaken to 30.0 inches and settle over the upper great lakes. 
meanwhile, 29.8 inch low pressure moves over lake winnipeg. these 
systems all shift east slowly through wednesday afternoon, when the 
weak high moves over new england as the 29.7 inch low moves over 
lake superior. by thursday afternoon, the low will deepen to 29.6 
inches over western quebec as a 30.2 inch high moves over northern 
manitoba. this high will extend 30.1 inch ridging over lake superior 
friday into the weekend. 




lsz265-240800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 pm edt sun aug 23 2026

.late this afternoon...northwest winds 20 to 30 knots. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...northwest winds 15 to 25 knots. waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.monday...north winds 15 to 25 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 
.monday night...northwest winds 5 to 15 knots backing southwest
late. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. a chance of showers and a slight
chance of thunderstorms by mid afternoon. waves calm to 2 feet. 
.tuesday night...south winds 15 to 25 knots. showers and a chance
of thunderstorms. waves building to 1 to 3 feet. 
.wednesday...southwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. showers likely through early
afternoon. a chance of showers by mid afternoon. waves subsiding
to calm to 2 feet. 
.wednesday night...northwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. waves building to 2 to 4 feet. 
.thursday...northwest winds 20 to 30 knots becoming north 10 to
20 knots. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to calm to 2 feet. 
.friday...north winds 10 to 20 knots backing southwest. waves
calm to 2 feet. 

$$