fzus61 kbuf 231402
glflo 
expires:202608232100;;226691

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sun aug 23 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 cold front continues to sweep eastward across lake 
ontario through this early afternoon. behind the front, a trough 
averaging 29.8 inches lingers over lake ontario through monday. on 
tuesday through wednesday, a ridge averaging 30.1 inches builds from 
the western and central great lakes. the ridge should begin to exit 
eastward on thursday and allow a warm front to sweep northeastward 
across lake ontario. on friday, a cold front should sweep eastward 
across the lake and be followed by a high pressure ridge averaging 
30.0 inches and building from the upper midwest.


loz063>065-232100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt sun aug 23 2026

.rest of today...southwest winds 15 to 20 knots becoming west and
increasing to 30 knots. a chance of waterspouts. a chance of
showers and thunderstorms, then showers with a chance of
thunderstorms late. waves 2 to 4 feet building to 4 to 7 feet.
waves occasionally around 9 feet. 
.tonight...west winds 15 to 25 knots becoming southwest. a chance
of waterspouts. showers with a chance of thunderstorms in the
evening, then showers after midnight. waves 4 to 7 feet. waves
occasionally around 9 feet. 
.monday...southwest winds 15 to 25 knots increasing to 30 knots.
a chance of waterspouts. showers in the morning, then showers
with a chance of thunderstorms in the afternoon. waves 3 to
6 feet building to 6 to 9 feet. waves occasionally around
11 feet. 
.monday night...southwest winds 15 to 25 knots becoming west. a
chance of waterspouts. showers with a chance of thunderstorms in
the evening, then showers overnight. waves 5 to 9 feet subsiding
to 4 to 7 feet. waves occasionally around 11 feet. 
.tuesday...west winds 15 to 20 knots becoming northwest 5 to
15 knots. a chance of waterspouts during the day. showers during
the day. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.wednesday...west winds 5 to 15 knots becoming southeast. waves
2 feet or less. 
.thursday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. a chance of showers and thunderstorms during the day,
then showers likely with a chance of thunderstorms thursday
night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 231402
glflo 
expires:202608232100;;226690

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sun aug 23 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 cold front continues to sweep eastward across lake 
ontario through this early afternoon. behind the front, a trough 
averaging 29.8 inches lingers over lake ontario through monday. on 
tuesday through wednesday, a ridge averaging 30.1 inches builds from 
the western and central great lakes. the ridge should begin to exit 
eastward on thursday and allow a warm front to sweep northeastward 
across lake ontario. on friday, a cold front should sweep eastward 
across the lake and be followed by a high pressure ridge averaging 
30.0 inches and building from the upper midwest.


loz062-232100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt sun aug 23 2026

.rest of today...west winds 15 to 25 knots. a chance of
waterspouts. a chance of showers late this morning, then showers
with a chance of thunderstorms this afternoon. waves 3 to 6 feet.
.tonight...west winds 15 to 25 knots. a chance of waterspouts.
showers likely with a chance of thunderstorms early, then a
chance of showers. showers likely late. waves 4 to 6 feet. 
.monday...southwest winds to 30 knots becoming west. a chance of
waterspouts. showers. waves 4 to 7 feet building to 6 to 9 feet.
waves occasionally around 11 feet. 
.monday night...west winds 15 to 25 knots. a chance of
waterspouts. showers likely in the evening, then a chance of
showers overnight. waves 5 to 8 feet subsiding to 3 to 6 feet.
waves occasionally around 10 feet. 
.tuesday...west winds 15 to 20 knots becoming northwest and
diminishing to less than 10 knots. a chance of waterspouts during
the day. a chance of showers during the day. waves 3 to 5 feet
subsiding to 1 foot or less. 
.wednesday...southwest winds 10 knots or less becoming south.
waves 1 foot or less. 
.thursday...south winds 5 to 10 knots becoming southwest. a
chance of showers and thunderstorms. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 231421
glfle 
expires:202608232015;;227635

open lake forecast for lake erie
national weather service cleveland oh
1021 am edt sun aug 23 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...
a trough averaging 29.80 will linger over the eastern great lakes 
through monday morning. high pressure 30.00 inches will gradually 
build into the region monday afternoon through tuesday night 
before departing to the east on wednesday. low pressure 29.80 
inches and a trailing cold front will move across the great lakes
late wednesday through thursday.


lez164-165-232015-
the islands to vermilion oh beyond 5 nm off shoreline to us-
canadian border-
vermilion to avon point oh beyond 5 nm off shoreline to us-
canadian border-
1021 am edt sun aug 23 2026

.this afternoon...northwest winds 15 to 20 knots becoming west. a
chance of waterspouts late. a slight chance of showers and
thunderstorms late. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.tonight...west winds 15 to 20 knots becoming northwest. a chance
of waterspouts through the early overnight. a chance of showers
and thunderstorms in the evening, then a slight chance of showers
after midnight. waves 3 to 5 feet. 
.monday...northwest winds 15 to 20 knots becoming west. waves
2 to 4 feet building to 3 to 5 feet. 
.monday night...west winds 15 to 20 knots becoming northwest
10 to 15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.tuesday...northwest winds 10 knots or less becoming southwest.
waves 1 foot or less. 
.wednesday...southwest winds 5 to 15 knots becoming south. a
chance of showers and thunderstorms wednesday night. waves 2 feet
or less. 
.thursday...southwest winds 5 to 15 knots becoming northwest. a
chance of showers and thunderstorms during the day, then a chance
of showers thursday night. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 231421
glfle 
expires:202608232015;;227636

open lake forecast for lake erie
national weather service cleveland oh
1021 am edt sun aug 23 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...
a trough averaging 29.80 will linger over the eastern great lakes 
through monday morning. high pressure 30.00 inches will gradually 
build into the region monday afternoon through tuesday night 
before departing to the east on wednesday. low pressure 29.80 
inches and a trailing cold front will move across the great lakes
late wednesday through thursday.


lez061-166>169-232015-
ripley to buffalo ny extending from 5nm 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-
1021 am edt sun aug 23 2026

.this afternoon...west winds 15 to 25 knots. a chance of
waterspouts. a chance of showers and thunderstorms. waves 4 to
6 feet. 
.tonight...west winds 15 to 20 knots becoming northwest. a chance
of waterspouts. showers with a chance of thunderstorms in the
evening, then a chance of showers and thunderstorms after
midnight. a chance of showers with a slight chance of
thunderstorms late. waves 3 to 6 feet. 
.monday...west winds 15 to 25 knots. a chance of waterspouts. a
chance of showers. waves 3 to 6 feet building to 5 to 7 feet.
waves occasionally around 9 feet. 
.monday night...west winds 15 to 25 knots becoming northwest and
diminishing to 10 to 15 knots. a chance of showers in the
evening. a chance of waterspouts. waves 4 to 7 feet subsiding to
1 to 3 feet. waves occasionally around 9 feet. 
.tuesday...northwest winds 5 to 15 knots becoming southwest.
waves 1 to 3 feet subsiding to 1 foot or less. 
.wednesday...southwest winds 5 to 15 knots becoming south. a
chance of showers wednesday night. waves 2 feet or less. 
.thursday...south winds 5 to 15 knots becoming west. a chance of
showers and thunderstorms during the day, then a chance of
showers thursday night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 231421
glfle 
expires:202608232015;;227634

open lake forecast for lake erie
national weather service cleveland oh
1021 am edt sun aug 23 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...
a trough averaging 29.80 will linger over the eastern great lakes 
through monday morning. high pressure 30.00 inches will gradually 
build into the region monday afternoon through tuesday night 
before departing to the east on wednesday. low pressure 29.80 
inches and a trailing cold front will move across the great lakes
late wednesday through thursday.


lez162-163-232015-
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-
1021 am edt sun aug 23 2026

.this afternoon...northwest winds 15 to 20 knots becoming west. a
chance of waterspouts late. a slight chance of showers and
thunderstorms late. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tonight...west winds 15 to 20 knots becoming northwest. a chance
of waterspouts early. a slight chance of showers and
thunderstorms early. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.monday...northwest winds 15 to 20 knots becoming west. waves
1 to 3 feet building to 2 to 4 feet. 
.monday night...west winds 15 to 20 knots becoming northwest and
diminishing to around 10 knots. waves 1 to 3 feet. 
.tuesday...northwest winds 10 knots or less becoming southwest.
waves 1 foot or less. 
.wednesday...southwest winds 5 to 15 knots. a chance of showers
wednesday night. waves 2 feet or less. 
.thursday...southwest winds 5 to 15 knots becoming northwest. a
chance of showers and thunderstorms during the day. waves 1 foot
or less. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 231340
glflh 
expires:202608232145;;226065

open lake forecast for lake huron
national weather service detroit/pontiac mi
940 am 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 afternoon and evening, favored
across lake huron, high pressure, 30.10 inches, willl move over
the great lakes late tomorrow into tuesday.


lhz361-232145-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
940 am edt sun aug 23 2026

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


$$

fzus63 kdtx 231340
glflh 
expires:202608232145;;226067

open lake forecast for lake huron
national weather service detroit/pontiac mi
940 am 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 afternoon and evening, favored
across lake huron, high pressure, 30.10 inches, willl move over
the great lakes late tomorrow into tuesday.


lhz462>464-232145-
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-
940 am edt sun aug 23 2026

.rest of today...northwest winds 20 to 25 knots with gusts to
around 30 knots. a chance of showers and thunderstorms in the
afternoon. waves 8 to 12 feet. waves occasionally around 15 feet.
.tonight...northwest winds 15 to 20 knots increasing to 20 to
25 knots late in the evening...then decreasing to 15 to 20 knots
after midnight increasing to 20 to 25 knots early in the morning.
gusts to 30 knots. a chance of showers and thunderstorms in the
evening...then a chance of showers after midnight. waves 8 to
12 feet. waves occasionally around 15 feet. 
.monday...west winds 20 to 25 knots becoming northwest 15 to
20 knots early 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 10 to 15 knots decreasing to 5 to
10 knots late in the morning...then becoming light and variable
late in the afternoon becoming southeast 5 to 10 knots late in
the evening. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.wednesday...south winds 5 to 10 knots increasing to 10 to
15 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. showers likely and a chance of
thunderstorms . waves 1 to 3 feet building to 3 to 5 feet . 
.thursday...south winds 10 to 15 knots becoming southwest 5 to
10 knots early in the evening...then veering to the northwest by
midnight. showers likely early in the morning...then a chance of
showers. waves 2 to 4 feet subsiding to 1 to 3 feet. 


$$

fzus63 kdtx 231340
glflh 
expires:202608232145;;226066

open lake forecast for lake huron
national weather service detroit/pontiac mi
940 am 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 afternoon and evening, favored
across lake huron, high pressure, 30.10 inches, willl move over
the great lakes late tomorrow into tuesday.


lhz362-363-232145-
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-
940 am edt sun aug 23 2026

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


$$

fzus63 kdtx 231339
glfsc 
expires:202608232145;;226062

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


lcz460-232145-
lake st clair-
939 am edt sun aug 23 2026

.rest of today...northwest winds 15 to 20 knots. mostly sunny. a
chance of showers and thunderstorms late in the afternoon. waves 1
to 3 feet.
.tonight...northwest winds 15 to 20 knots. partly cloudy in the
evening then clearing. a chance of showers and thunderstorms early
in the evening. waves 1 to 3 feet.
.monday...west winds 15 to 20 knots. mostly sunny. waves 1 to 3
feet.
.monday night...northwest winds 10 to 15 knots diminishing to 5 to
10 knots in the late evening and overnight. mostly clear. waves 2
feet or less.
.tuesday...northwest winds 5 to 10 knots in the morning becoming
light and variable...then becoming south 5 to 10 knots in the
evening. sunny in the morning becoming mostly clear. waves 2 feet or
less.
.wednesday...south winds 10 to 15 knots. mostly clear. a chance of
showers and thunderstorms. waves 2 feet or less.
.thursday...west winds 10 to 15 knots. partly cloudy. a chance of
showers and thunderstorms. waves 2 feet or less.

$$

fzus63 kmkx 231343
glflm 
expires:202608232115;;226131

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
843 am 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. 


lmz080-669-671-673-675-777-779-870-872-874-876-878-232115-
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-
843 am cdt sun aug 23 2026

sheboygan wi to pentwater mi south...

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

$$

fzus63 kmkx 231343
glflm 
expires:202608232115;;226130

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
843 am 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. 


lmz261-362-364-366-563-565-567-868-232115-
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-
843 am cdt sun aug 23 2026

sheboygan wi to pentwater mi north...

.rest of today...northwest winds to 30 kt becoming north. slight
chance of showers through mid morning. waves 4 to 7 ft
occasionally to 9 ft. 
.tonight...north winds to 30 kt becoming northwest. waves 4 to
7 ft occasionally to 9 ft. 
.monday...northwest winds 15 to 25 kt. waves 4 to 6 ft
occasionally to 8 ft subsiding to 2 to 4 ft. 
.monday night...northwest winds 10 to 20 kt diminishing to 5 to
10 kt overnight. waves 2 to 4 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 diminishing to 10 to
20 kt. chance of showers. waves 3 to 5 ft. 
.wednesday...southwest winds 15 to 25 kt becoming south to 30 kt.
showers likely with a chance of thunderstorms. waves 4 to 6 ft
occasionally to 8 ft. 
.thursday...northwest winds 10 to 20 kt increasing to 30 kt.
waves 1 to 3 ft.  

$$

fzus63 kmqt 231401
glfls 
expires:202608232000;;226654

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 morning, a 29.7 inch low is along the quebec/ontario line while 
30.1 inch high pressure extends from northwestern ontario to iowa. 
little movement is expected with only a slight weakening of both 
pressure centers through today and 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. 




lsz267-232000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1000 am edt sun aug 23 2026

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

$$

fzus63 kmqt 231401
glfls 
expires:202608232000;;226651

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 morning, a 29.7 inch low is along the quebec/ontario line while 
30.1 inch high pressure extends from northwestern ontario to iowa. 
little movement is expected with only a slight weakening of both 
pressure centers through today and 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. 




lsz264-232000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1000 am edt sun aug 23 2026

.rest of today...north winds 10 to 20 knots backing northwest
late. waves 3 to 5 feet occasionally to 7 feet subsiding to 1 to
3 feet. 
.tonight...northwest winds 10 to 20 knots becoming north 5 to
15 knots late. waves 1 to 3 feet. 
.monday...north winds 5 to 15 knots backing west late. waves
subsiding to calm to 2 feet. 
.monday night...west winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots backing southeast by mid
afternoon. a slight chance of showers by mid afternoon. waves
calm to 2 feet. 
.tuesday night...southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. showers and a chance of
thunderstorms. waves building to 1 to 3 feet. 
.wednesday...west winds 5 to 15 knots becoming northwest 10 to
20 knots. a chance of showers. waves subsiding to calm to 2 feet.
.thursday...northwest winds 15 to 25 knots becoming north 5 to
15 knots. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 

$$

fzus63 kmqt 231401
glfls 
expires:202608232000;;226652

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 morning, a 29.7 inch low is along the quebec/ontario line while 
30.1 inch high pressure extends from northwestern ontario to iowa. 
little movement is expected with only a slight weakening of both 
pressure centers through today and 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. 




lsz265-232000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1000 am edt sun aug 23 2026

.rest of today...north winds 20 to 30 knots backing northwest
late. isolated showers. waves 3 to 6 feet occasionally to 8 feet.
.tonight...northwest winds 15 to 25 knots. waves subsiding to
2 to 4 feet. 
.monday...north winds 10 to 20 knots backing northwest in the
afternoon, then diminishing to 5 to 15 knots late. waves
subsiding to 1 to 3 feet. 
.monday night...west winds 5 to 15 knots. waves subsiding to calm
to 2 feet. 
.tuesday...south winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. a chance of showers by mid afternoon.
waves calm to 2 feet. 
.tuesday night...southeast winds 15 to 25 knots veering south
after midnight. showers and a chance of thunderstorms. waves
building to 1 to 3 feet. 
.wednesday...west winds 10 to 20 knots becoming northwest 15 to
25 knots. showers likely. waves subsiding to calm to 2 feet, then
building to 2 to 4 feet. 
.thursday...northwest gales to 35 knots diminishing to 15 to
25 knots. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 231401
glfls 
expires:202608232000;;226649

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 morning, a 29.7 inch low is along the quebec/ontario line while 
30.1 inch high pressure extends from northwestern ontario to iowa. 
little movement is expected with only a slight weakening of both 
pressure centers through today and 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. 




lsz162-232000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt sun aug 23 2026 /900 am cdt sun aug 23 2026/

.rest of today...north winds 5 to 15 knots backing southwest in
the afternoon. waves calm to 2 feet. 
.tonight...southwest winds 5 to 15 knots veering northwest after
midnight, then veering north late. 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 becoming south less
than 10 knots after midnight. 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 chance of showers through early afternoon, then
showers likely and a slight chance of thunderstorms by mid
afternoon. waves calm to 2 feet. 
.tuesday night...east winds 5 to 15 knots veering west after
midnight. showers likely through midnight. a chance of
thunderstorms. a chance of showers after midnight. waves calm to
2 feet. 
.wednesday...west winds 5 to 15 knots becoming northwest 10 to
20 knots. a chance of showers. waves calm to 2 feet. 
.thursday...northwest winds 10 to 20 knots becoming north 5 to
15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 231401
glfls 
expires:202608232000;;226650

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 morning, a 29.7 inch low is along the quebec/ontario line while 
30.1 inch high pressure extends from northwestern ontario to iowa. 
little movement is expected with only a slight weakening of both 
pressure centers through today and 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. 




lsz263-232000-
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-
1000 am edt sun aug 23 2026

.rest of today...north winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing west late. waves 1 to
3 feet subsiding to calm to 2 feet. 
.tonight...west winds 5 to 15 knots veering north late. waves
calm to 2 feet. 
.monday...north winds 5 to 15 knots backing northwest in the
afternoon, then backing southwest late. 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 backing east by mid
afternoon. a slight chance of showers through early afternoon,
then showers likely 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 calm
to 2 feet. 
.wednesday...west winds 10 to 20 knots veering northwest. a
chance of showers. waves calm to 2 feet. 
.thursday...northwest winds 10 to 20 knots becoming north 5 to
15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 231401
glfls 
expires:202608232000;;226653

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 morning, a 29.7 inch low is along the quebec/ontario line while 
30.1 inch high pressure extends from northwestern ontario to iowa. 
little movement is expected with only a slight weakening of both 
pressure centers through today and 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. 




lsz266-232000-
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-
1000 am edt sun aug 23 2026

.rest of today...north winds 20 to 30 knots backing northwest
late. isolated showers. waves 4 to 7 feet occasionally to 9 feet.
.tonight...northwest winds 20 to 30 knots diminishing to 15 to
25 knots after midnight, then veering north late. waves subsiding
to 3 to 6 feet occasionally to 8 feet, then building to 4 to
7 feet occasionally to 9 feet. 
.monday...north winds 15 to 25 knots backing northwest in the
afternoon, then diminishing to 10 to 20 knots late. waves
subsiding to 2 to 4 feet. 
.monday night...northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. 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 becoming northwest 15 to
25 knots. showers likely. waves subsiding to calm to 2 feet, then
building to 2 to 4 feet. 
.thursday...northwest gales to 35 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. 

$$