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(1/11)
Latest Great Lakes Marine Forecast by KDTX
Issued 8/23/2026 3:22 AM America/New_York.
Valid through 8/23/2026 11:30 AM America/New_York.
fzus63 kdtx 230722
glflh
expires:202608231530;;212685
open lake forecast for lake huron
national weather service detroit/pontiac mi
322 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.
lhz361-231530-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
322 am edt sun aug 23 2026
.today...northwest winds 20 to 25 knots with gusts to around
30 knots. waves 5 to 7 feet. waves occasionally around 10 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 5 to 7 feet. waves
occasionally around 10 feet.
.monday night...northwest winds 15 to 20 knots decreasing to 5 to
10 knots. waves 3 to 5 feet subsiding to 1 to 3 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.
.thursday...southwest winds 10 to 15 knots veering to the
northwest . a chance of showers. waves 1 to 3 feet.
$$
(2/11)
Latest Great Lakes Marine Forecast by KDTX
Issued 8/23/2026 3:22 AM America/New_York.
Valid through 8/23/2026 11:30 AM America/New_York.
fzus63 kdtx 230722
glflh
expires:202608231530;;212686
open lake forecast for lake huron
national weather service detroit/pontiac mi
322 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.
lhz362-363-231530-
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-
322 am edt sun aug 23 2026
.today...northwest winds 20 to 25 knots increasing to 30 knots in
the late morning and afternoon. a chance of waterspouts in the
morning. waves 8 to 12 feet. waves occasionally around 15 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 8 to 12 feet. waves occasionally
around 15 feet.
.monday...northwest winds to 30 knots decreasing to 20 to
25 knots in the late morning and afternoon. waves 8 to 12 feet.
waves occasionally around 15 feet.
.monday night...northwest winds 15 to 20 knots with gusts to
around 30 knots decreasing to 10 to 15 knots after midnight.
waves 4 to 6 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 2 feet or less. waves
occasionally around 8 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 2 to
4 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 subsiding to
1 to 3 feet.
$$
(3/11)
Latest Great Lakes Marine Forecast by KDTX
Issued 8/23/2026 3:22 AM America/New_York.
Valid through 8/23/2026 11:30 AM America/New_York.
fzus63 kdtx 230722
glflh
expires:202608231530;;212687
open lake forecast for lake huron
national weather service detroit/pontiac mi
322 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>464-231530-
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-
322 am edt sun aug 23 2026
.today...northwest winds 20 to 25 knots with gusts to around
30 knots. a chance of showers in the morning...then 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 6 to 9 feet. waves occasionally
around 12 feet.
.monday night...northwest winds 10 to 15 knots. waves 4 to
6 feet. waves occasionally around 8 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 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. showers likely and a chance of
thunderstorms . waves 1 to 3 feet building to 2 to 4 feet by
midnight.
.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.
$$
(4/11)
Latest Great Lakes Marine Forecast by KMKX
Issued 8/23/2026 2:55 AM US/Central.
Valid through 8/23/2026 10:15 AM US/Central.
fzus63 kmkx 230755
glflm
expires:202608231515;;213550
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
255 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...
isolated showers and storms will remain possible over the lake
through mid morning, with a small chance for a waterspout.
otherwise, breezy north to northwest winds will persist today due
to being sandwiched between deepening low pressure around 29.7
inches over the eastern great lakes and high pressure of 30.2
inches building in from the northwest. winds will eventually
become lighter by midday monday, persisting into tuesday as the
high moves overhead. breezy southerly winds will develop later
tuesday into wednesday as the high exits and low pressure of 29.6
inches approaches from manitoba.
lmz261-362-364-366-563-565-567-868-231515-
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-
255 am cdt sun aug 23 2026
sheboygan wi to pentwater mi north...
.today...northwest winds 15 to 25 kt becoming north to 30 kt.
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.
$$
(5/11)
Latest Great Lakes Marine Forecast by KMKX
Issued 8/23/2026 2:55 AM US/Central.
Valid through 8/23/2026 10:15 AM US/Central.
fzus63 kmkx 230755
glflm
expires:202608231515;;213551
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
255 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...
isolated showers and storms will remain possible over the lake
through mid morning, with a small chance for a waterspout.
otherwise, breezy north to northwest winds will persist today due
to being sandwiched between deepening low pressure around 29.7
inches over the eastern great lakes and high pressure of 30.2
inches building in from the northwest. winds will eventually
become lighter by midday monday, persisting into tuesday as the
high moves overhead. breezy southerly winds will develop later
tuesday into wednesday as the high exits and low pressure of 29.6
inches approaches from manitoba.
lmz080-669-671-673-675-777-779-870-872-874-876-878-231515-
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-
255 am cdt sun aug 23 2026
sheboygan wi to pentwater mi south...
.today...northwest winds 15 to 25 kt becoming north. slight
chance of waterspouts this morning. 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.
$$
(6/11)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/23/2026 4:01 AM America/New_York.
Valid through 8/23/2026 4:00 PM America/New_York.
fzus63 kmqt 230801
glfls
expires:202608232000;;213764
open lake forecast for lake superior
national weather service marquette mi
400 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...
30.1 inch ridging moves into lake superior early this week via a
weakening 30.2 inch parent high from the canadian prairies that
drops down into the ohio river valley by late monday, weakening to
30.1 inches as it does so. a 29.7 inch clipper over the canadian
prairies monday night then drops southeast towards lake superior,
arriving early wednesday morning. the low shifts east wednesday
night with weak ridging of 29.9 inches building over the lake on
thursday.
lsz162-232000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt sun aug 23 2026 /300 am cdt sun aug 23 2026/
.early this morning...north winds 5 to 15 knots. waves calm to
2 feet.
.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 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.
$$
(7/11)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/23/2026 4:01 AM America/New_York.
Valid through 8/23/2026 4:00 PM America/New_York.
fzus63 kmqt 230801
glfls
expires:202608232000;;213765
open lake forecast for lake superior
national weather service marquette mi
400 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...
30.1 inch ridging moves into lake superior early this week via a
weakening 30.2 inch parent high from the canadian prairies that
drops down into the ohio river valley by late monday, weakening to
30.1 inches as it does so. a 29.7 inch clipper over the canadian
prairies monday night then drops southeast towards lake superior,
arriving early wednesday morning. the low shifts east wednesday
night with weak ridging of 29.9 inches building over the lake on
thursday.
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-
400 am edt sun aug 23 2026
.early this morning...north winds 10 to 20 knots. waves 1 to
3 feet.
.today...north winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then backing west late. waves building to 2 to
4 feet, then 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. showers likely 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.
$$
(8/11)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/23/2026 4:01 AM America/New_York.
Valid through 8/23/2026 4:00 PM America/New_York.
fzus63 kmqt 230801
glfls
expires:202608232000;;213766
open lake forecast for lake superior
national weather service marquette mi
400 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...
30.1 inch ridging moves into lake superior early this week via a
weakening 30.2 inch parent high from the canadian prairies that
drops down into the ohio river valley by late monday, weakening to
30.1 inches as it does so. a 29.7 inch clipper over the canadian
prairies monday night then drops southeast towards lake superior,
arriving early wednesday morning. the low shifts east wednesday
night with weak ridging of 29.9 inches building over the lake on
thursday.
lsz264-232000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 am edt sun aug 23 2026
.early this morning...north winds 10 to 20 knots. waves 2 to
4 feet.
.today...north winds 10 to 20 knots backing northwest late. waves
building to 3 to 5 feet occasionally to 7 feet, then 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. 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.
$$
(9/11)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/23/2026 4:01 AM America/New_York.
Valid through 8/23/2026 4:00 PM America/New_York.
fzus63 kmqt 230801
glfls
expires:202608232000;;213767
open lake forecast for lake superior
national weather service marquette mi
400 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...
30.1 inch ridging moves into lake superior early this week via a
weakening 30.2 inch parent high from the canadian prairies that
drops down into the ohio river valley by late monday, weakening to
30.1 inches as it does so. a 29.7 inch clipper over the canadian
prairies monday night then drops southeast towards lake superior,
arriving early wednesday morning. the low shifts east wednesday
night with weak ridging of 29.9 inches building over the lake on
thursday.
lsz265-232000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 am edt sun aug 23 2026
.early this morning...north winds 20 to 30 knots. waves 3 to
5 feet occasionally to 7 feet.
.today...north winds 20 to 30 knots backing northwest late.
isolated showers. waves building to 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.
$$
(10/11)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/23/2026 4:01 AM America/New_York.
Valid through 8/23/2026 4:00 PM America/New_York.
fzus63 kmqt 230801
glfls
expires:202608232000;;213768
open lake forecast for lake superior
national weather service marquette mi
400 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...
30.1 inch ridging moves into lake superior early this week via a
weakening 30.2 inch parent high from the canadian prairies that
drops down into the ohio river valley by late monday, weakening to
30.1 inches as it does so. a 29.7 inch clipper over the canadian
prairies monday night then drops southeast towards lake superior,
arriving early wednesday morning. the low shifts east wednesday
night with weak ridging of 29.9 inches building over the lake on
thursday.
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-
400 am edt sun aug 23 2026
.early this morning...north winds 20 to 30 knots. waves 3 to
6 feet occasionally to 8 feet.
.today...north winds 20 to 30 knots backing northwest late.
isolated showers. waves building to 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. 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.
$$
(11/11)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/23/2026 4:01 AM America/New_York.
Valid through 8/23/2026 4:00 PM America/New_York.
fzus63 kmqt 230801
glfls
expires:202608232000;;213769
open lake forecast for lake superior
national weather service marquette mi
400 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...
30.1 inch ridging moves into lake superior early this week via a
weakening 30.2 inch parent high from the canadian prairies that
drops down into the ohio river valley by late monday, weakening to
30.1 inches as it does so. a 29.7 inch clipper over the canadian
prairies monday night then drops southeast towards lake superior,
arriving early wednesday morning. the low shifts east wednesday
night with weak ridging of 29.9 inches building over the lake on
thursday.
lsz267-232000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 am edt sun aug 23 2026
.early this morning...north winds 20 to 30 knots. waves 3 to
6 feet occasionally to 8 feet.
.today...north winds 20 to 30 knots becoming northwest to
30 knots with a few gale force gusts to 35 knots possible in the
afternoon. isolated showers. waves 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.
$$
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