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(1/12)
Latest Great Lakes Marine Forecast by KDTX
Issued 9/12/2025 9:55 PM America/New_York.
Valid through 9/13/2025 6:00 AM America/New_York.
fzus63 kdtx 130155
glflh
expires:202509131000;;885060
open lake forecast for lake huron
national weather service detroit/pontiac mi
955 pm edt fri sep 12 2025
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...a few showers occur over the north half of lake huron
tonight as surface pressure falls to 30.10 inches over lake huron
by saturday morning. an upper level disturbance tracks across the
area saturday followed by a weak cold front saturday night, which
may trigger additional light showers. high pressure then fills
back into the region early next week.
lhz361-362-131000-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
lake huron from presque isle light to sturgeon point mi beyond
5nm off shore-
955 pm edt fri sep 12 2025
.rest of tonight...southeast winds 5 to 10 knots in the late
evening and early morning becoming light and variable. a chance
of showers. waves 2 feet or less.
.saturday...light and variable winds. waves 2 feet or less.
.saturday night...light and variable winds. waves 2 feet or less.
.sunday...light and variable winds becoming northeast 5 to
10 knots in the late morning and afternoon. waves 2 feet or less.
.sunday night...light and variable winds becoming northeast 5 to
10 knots in the late evening and overnight. waves 2 feet or less.
.monday...east winds 5 to 10 knots becoming light and variable.
waves 2 feet or less.
.tuesday...light and variable winds. waves 2 feet or less.
.wednesday...light and variable winds. waves 2 feet or less.
$$
(2/12)
Latest Great Lakes Marine Forecast by KDTX
Issued 9/12/2025 9:55 PM America/New_York.
Valid through 9/13/2025 6:00 AM America/New_York.
fzus63 kdtx 130155
glflh
expires:202509131000;;885061
open lake forecast for lake huron
national weather service detroit/pontiac mi
955 pm edt fri sep 12 2025
for waters beyond five nautical miles off shore on lake huron
waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.
.synopsis...a few showers occur over the north half of lake huron
tonight as surface pressure falls to 30.10 inches over lake huron
by saturday morning. an upper level disturbance tracks across the
area saturday followed by a weak cold front saturday night, which
may trigger additional light showers. high pressure then fills
back into the region early next week.
lhz363-462>464-131000-
lake huron from sturgeon point to alabaster mi beyond 5nm off
shore-
lake huron from port austin to harbor beach beyond 5nm off shore-
lake huron from harbor beach to port sanilac beyond 5nm off shore-
lake huron from port sanilac to port huron beyond 5nm off shore-
955 pm edt fri sep 12 2025
.rest of tonight...southeast winds 5 to 10 knots. waves 2 feet or
less.
.saturday...southwest winds 5 to 10 knots until late afternoon
becoming light and variable. waves 2 feet or less.
.saturday night...light and variable winds. waves 2 feet or less.
.sunday...light and variable winds becoming northeast 5 to
10 knots in the late morning and afternoon. waves 2 feet or less.
.sunday night...northeast winds 5 to 10 knots veering to the east
after midnight. waves 1 to 3 feet.
.monday...northeast winds 5 to 10 knots. waves 2 feet or less.
.tuesday...light and variable winds. waves 2 feet or less.
.wednesday...light and variable winds becoming east 5 to 10 knots
in the late evening and early morning. waves 2 feet or less.
$$
(3/12)
Latest Great Lakes Marine Forecast by KMKX
Issued 9/12/2025 10:29 PM US/Central.
Valid through 9/13/2025 4:15 AM US/Central.
fzus63 kmkx 130329
glflm
expires:202509130915;;888169
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
1029 pm cdt fri sep 12 2025
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...
dense fog with visibility below 1 nm is expected to expand and
persist over much of the north half of lake michigan tonight
through mid saturday morning.
low pressure around 29.6 inches over the northern great plains
will remain in place through early next week. lake michigan will
have south to southeast flow overnight into saturday. an area of
showers will cross wi and lake michigan overnight through
saturday afternoon. winds will gradually become northeast saturday
night into sunday as a frontal boundary shifts south and high
pressure around 30.3 inches develops in quebec. high pressure
remains dominant over the upper great lakes monday and tuesday,
with periods of light east to southeast winds (otherwise, light
and variable).
lmz080-671-673-675-777-779-872-874-876-878-130915-
lake michigan from michigan city in to st. joseph mi 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 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-
1029 pm cdt fri sep 12 2025
port washington wi to whitehall mi south...
.rest of tonight...southeast winds 10 to 15 kt becoming south.
slight chance of showers overnight. waves 1 to 2 ft.
.saturday...south winds 10 to 15 kt. chance of showers and slight
chance of thunderstorms, mainly in the morning. waves 1 to 3 ft.
.saturday night...southeast winds 10 to 15 kt becoming east 5 to
10 kt. waves 1 to 3 ft.
.sunday...east winds 5 to 10 kt becoming northeast. waves 1 to
2 ft.
.sunday night...northeast winds 10 to 15 kt becoming east. waves
1 to 3 ft.
.monday...east winds 10 to 15 kt becoming northeast 5 to 10 kt.
waves 1 to 3 ft.
.monday night...northeast winds 5 to 10 kt becoming southeast
10 to 15 kt. waves 1 to 2 ft.
.tuesday...southeast winds 5 to 10 kt becoming east. waves 1 to
2 ft.
.wednesday...southeast winds 5 to 10 kt becoming east. waves 1 to
2 ft.
$$
(4/12)
Latest Great Lakes Marine Forecast by KMKX
Issued 9/12/2025 10:29 PM US/Central.
Valid through 9/13/2025 4:15 AM US/Central.
fzus63 kmkx 130329
glflm
expires:202509130915;;888168
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
1029 pm cdt fri sep 12 2025
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...
dense fog with visibility below 1 nm is expected to expand and
persist over much of the north half of lake michigan tonight
through mid saturday morning.
low pressure around 29.6 inches over the northern great plains
will remain in place through early next week. lake michigan will
have south to southeast flow overnight into saturday. an area of
showers will cross wi and lake michigan overnight through
saturday afternoon. winds will gradually become northeast saturday
night into sunday as a frontal boundary shifts south and high
pressure around 30.3 inches develops in quebec. high pressure
remains dominant over the upper great lakes monday and tuesday,
with periods of light east to southeast winds (otherwise, light
and variable).
lmz261-362-364-366-563-565-567-669-868-870-130915-
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 sheboygan to port washington wi 5 nm offshore
to mid lake-
lake michigan from pentwater to manistee mi 5 nm offshore to mid
lake-
lake michigan from whitehall to pentwater mi 5 nm offshore to mid
lake-
1029 pm cdt fri sep 12 2025
port washington wi to whitehall mi north...
...dense fog advisory in effect until 10 am cdt saturday...
.rest of tonight...southeast winds 5 to 10 kt becoming south.
patchy dense fog, with the worst of it over western portions of
the lake. slight chance of showers late this evening, then chance
of showers overnight. waves 1 to 2 ft.
.saturday...southeast winds 10 to 15 kt becoming south. patchy
dense fog in the morning. chance of showers in the morning, then
slight chance of showers in the afternoon. waves 1 to 3 ft.
.saturday night...southeast winds 5 to 10 kt becoming east.
patchy fog overnight. waves 1 to 3 ft.
.sunday...northeast winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 2 ft.
.sunday night...northeast winds 10 to 20 kt becoming east 10 to
15 kt. waves 1 to 3 ft.
.monday...southeast winds 10 to 15 kt becoming east 10 to 20 kt.
waves 1 to 3 ft.
.monday night...east winds 10 to 20 kt becoming southeast 5 to
10 kt. waves 1 to 2 ft.
.tuesday...south winds 5 to 10 kt. waves 1 to 2 ft.
.wednesday...south winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 ft or less.
$$
(5/12)
Latest Great Lakes Marine Forecast by KMKX
Issued 9/12/2025 8:52 PM US/Central.
Valid through 9/13/2025 4:30 AM US/Central.
fzus63 kmkx 130152
glflm
expires:202509130930;;885012
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
852 pm cdt fri sep 12 2025
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...
dense fog with visibility below 1 nm is expected to expand and
persist over much of the north half of lake michigan tonight
through mid saturday morning.
low pressure around 29.6 inches over the northern great plains
will remain in place through early next week. lake michigan will
have south to southeast flow overnight into saturday. an area of
showers will cross wi and lake michigan overnight through
saturday afternoon. winds will gradually become northeast saturday
night into sunday as a frontal boundary shifts south and high
pressure around 30.3 inches develops in quebec. high pressure
remains dominant over the upper great lakes monday and tuesday,
with periods of light east to southeast winds (otherwise, light
and variable).
lmz261-362-364-366-563-565-567-868-130930-
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-
852 pm cdt fri sep 12 2025
sheboygan wi to pentwater mi north...
...dense fog advisory in effect until 10 am cdt saturday...
.rest of tonight...southeast winds 5 to 10 kt becoming south.
patchy dense fog. chance of showers overnight. waves 1 ft or
less.
.saturday...southeast winds 10 to 15 kt becoming south. patchy
dense fog in the morning. chance of showers in the morning. waves
1 to 3 ft.
.saturday night...southeast winds 5 to 10 kt becoming east.
patchy fog overnight. waves 1 to 3 ft.
.sunday...northeast winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 2 ft.
.sunday night...northeast winds 10 to 20 kt becoming southeast
10 to 15 kt. waves 1 to 2 ft.
.monday...southeast winds 10 to 15 kt becoming east 10 to 20 kt.
waves 1 to 2 ft.
.monday night...east winds 10 to 20 kt becoming southeast 5 to
10 kt. waves 1 to 2 ft.
.tuesday...south winds 5 to 10 kt. waves 1 ft or less.
.wednesday...south winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 ft or less.
$$
(6/12)
Latest Great Lakes Marine Forecast by KMKX
Issued 9/12/2025 8:52 PM US/Central.
Valid through 9/13/2025 4:30 AM US/Central.
fzus63 kmkx 130152
glflm
expires:202509130930;;885013
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
852 pm cdt fri sep 12 2025
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...
dense fog with visibility below 1 nm is expected to expand and
persist over much of the north half of lake michigan tonight
through mid saturday morning.
low pressure around 29.6 inches over the northern great plains
will remain in place through early next week. lake michigan will
have south to southeast flow overnight into saturday. an area of
showers will cross wi and lake michigan overnight through
saturday afternoon. winds will gradually become northeast saturday
night into sunday as a frontal boundary shifts south and high
pressure around 30.3 inches develops in quebec. high pressure
remains dominant over the upper great lakes monday and tuesday,
with periods of light east to southeast winds (otherwise, light
and variable).
lmz669-671-870-872-130930-
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 whitehall to pentwater mi 5 nm offshore to mid
lake-
lake michigan from grand haven to whitehall mi 5 nm offshore to
mid lake-
852 pm cdt fri sep 12 2025
sheboygan wi to pentwater mi south to north point light wi to
grand haven mi...
...dense fog advisory in effect until 10 pm cdt this evening...
.rest of tonight...southeast winds 5 to 10 kt increasing to 10 to
15 kt. chance of showers overnight. waves 1 to 2 ft.
.saturday...southeast winds 10 to 15 kt becoming south. chance of
showers and slight chance of thunderstorms in the morning, then
slight chance of showers and thunderstorms in the afternoon.
waves 1 to 3 ft.
.saturday night...southeast winds 10 to 15 kt becoming east 5 to
10 kt. waves 1 to 3 ft.
.sunday...east winds 5 to 10 kt becoming northeast 10 to 15 kt.
waves 1 to 2 ft.
.sunday night...northeast winds 10 to 15 kt becoming east. waves
1 to 3 ft.
.monday...southeast winds 10 to 15 kt becoming east 5 to 10 kt.
waves 1 to 3 ft.
.monday night...northeast winds 5 to 10 kt becoming southeast
10 to 15 kt. waves 1 to 2 ft.
.tuesday...southeast winds 5 to 10 kt becoming south. waves 1 to
2 ft.
.wednesday...southeast winds 5 to 10 kt becoming south. waves
1 to 2 ft.
$$
(7/12)
Latest Great Lakes Marine Forecast by KMQT
Issued 9/12/2025 10:01 PM America/New_York.
Valid through 9/13/2025 4:00 AM America/New_York.
fzus63 kmqt 130201
glfls
expires:202509130800;;885376
open lake forecast for lake superior
national weather service marquette mi
1001 pm edt fri sep 12 2025
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...
weak 30.0 inch troughing will extend over lake superior from a 29.7
inch low over the northern plains tonight into saturday. 30.1 inch
ridging returns late saturday into sunday and strengthens to 30.2
inches by monday as a 30.3 inch high builds over james bay and
quebec.
lsz264-130800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1001 pm edt fri sep 12 2025
.rest of tonight...southeast winds 5 to 15 knots backing east
after midnight, then diminishing to less than 10 knots late.
patchy fog. a slight chance of thunderstorms by midnight. a
chance of showers. waves calm to 2 feet.
.saturday...northeast winds 5 to 15 knots. patchy fog through
early afternoon. waves calm to 2 feet.
.saturday night...east winds 5 to 15 knots. waves calm to 2 feet.
.sunday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves calm to 2 feet.
.sunday night...east winds 5 to 15 knots veering southeast after
midnight. waves calm to 2 feet.
.monday...southeast winds 5 to 15 knots. waves calm to 2 feet.
.monday night...southeast winds 5 to 15 knots veering south after
midnight. waves calm to 2 feet.
.tuesday...south winds 5 to 15 knots. waves calm to 2 feet.
.wednesday...south winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet.
$$
(8/12)
Latest Great Lakes Marine Forecast by KMQT
Issued 9/12/2025 10:01 PM America/New_York.
Valid through 9/13/2025 4:00 AM America/New_York.
fzus63 kmqt 130201
glfls
expires:202509130800;;885377
open lake forecast for lake superior
national weather service marquette mi
1001 pm edt fri sep 12 2025
for waters beyond 5 nautical miles of shore on lake superior.
waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.
.synopsis...
weak 30.0 inch troughing will extend over lake superior from a 29.7
inch low over the northern plains tonight into saturday. 30.1 inch
ridging returns late saturday into sunday and strengthens to 30.2
inches by monday as a 30.3 inch high builds over james bay and
quebec.
lsz265-130800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1001 pm edt fri sep 12 2025
.rest of tonight...southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. patchy fog. a chance of showers and
a slight chance of thunderstorms. waves calm to 2 feet.
.saturday...southeast winds 5 to 15 knots backing northeast in
the afternoon. patchy fog through early afternoon. waves calm to
2 feet.
.saturday night...east winds 5 to 15 knots. waves calm to 2 feet.
.sunday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves calm to 2 feet.
.sunday night...southeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves calm to 2 feet.
.monday...southeast winds 10 to 20 knots. waves calm to 2 feet.
.monday night...southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. waves calm to 2 feet.
.tuesday...southeast winds 5 to 15 knots veering south. waves
calm to 2 feet.
.wednesday...southeast winds 10 to 20 knots veering south. a
chance of showers. waves calm to 2 feet.
$$
(9/12)
Latest Great Lakes Marine Forecast by KMQT
Issued 9/12/2025 10:01 PM America/New_York.
Valid through 9/13/2025 4:00 AM America/New_York.
fzus63 kmqt 130201
glfls
expires:202509130800;;885374
open lake forecast for lake superior
national weather service marquette mi
1001 pm edt fri sep 12 2025
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...
weak 30.0 inch troughing will extend over lake superior from a 29.7
inch low over the northern plains tonight into saturday. 30.1 inch
ridging returns late saturday into sunday and strengthens to 30.2
inches by monday as a 30.3 inch high builds over james bay and
quebec.
lsz162-130800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt fri sep 12 2025 /901 pm cdt fri sep 12 2025/
.rest of tonight...northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. patchy fog. a slight chance of
thunderstorms by midnight. a chance of showers. waves calm to
2 feet.
.saturday...northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. waves building to 1 to 3 feet.
.saturday night...northeast winds 10 to 20 knots. waves 1 to
3 feet.
.sunday...east winds 10 to 20 knots backing northeast by mid
afternoon. waves building to 2 to 4 feet.
.sunday night...northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet.
.monday...east winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. waves calm to 2 feet.
.monday night...northeast winds 5 to 15 knots. waves calm to
2 feet.
.tuesday...east winds 5 to 15 knots backing northeast. waves calm
to 2 feet.
.wednesday...south winds 5 to 15 knots becoming northeast 10 to
20 knots. a chance of showers. waves calm to 2 feet.
$$
(10/12)
Latest Great Lakes Marine Forecast by KMQT
Issued 9/12/2025 10:01 PM America/New_York.
Valid through 9/13/2025 4:00 AM America/New_York.
fzus63 kmqt 130201
glfls
expires:202509130800;;885379
open lake forecast for lake superior
national weather service marquette mi
1001 pm edt fri sep 12 2025
for waters beyond 5 nautical miles of shore on lake superior.
waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.
.synopsis...
weak 30.0 inch troughing will extend over lake superior from a 29.7
inch low over the northern plains tonight into saturday. 30.1 inch
ridging returns late saturday into sunday and strengthens to 30.2
inches by monday as a 30.3 inch high builds over james bay and
quebec.
lsz267-130800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1001 pm edt fri sep 12 2025
.rest of tonight...southeast winds 10 to 20 knots veering south
after midnight. patchy fog. a chance of showers. waves calm to
2 feet.
.saturday...south winds 5 to 15 knots backing east in the
afternoon, then backing northeast late. patchy fog through early
afternoon. waves calm to 2 feet.
.saturday night...northeast winds 5 to 15 knots veering east
late. waves calm to 2 feet.
.sunday...east winds 5 to 15 knots. waves calm to 2 feet.
.sunday night...east winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. waves calm to 2 feet.
.monday...southeast winds 10 to 20 knots. waves calm to 2 feet.
.monday night...southeast winds 10 to 20 knots. waves calm to
2 feet.
.tuesday...southeast winds 10 to 20 knots veering south. waves
calm to 2 feet.
.wednesday...southeast winds 10 to 20 knots veering south. a
chance of showers. waves calm to 2 feet.
$$
(11/12)
Latest Great Lakes Marine Forecast by KMQT
Issued 9/12/2025 10:01 PM America/New_York.
Valid through 9/13/2025 4:00 AM America/New_York.
fzus63 kmqt 130201
glfls
expires:202509130800;;885378
open lake forecast for lake superior
national weather service marquette mi
1001 pm edt fri sep 12 2025
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...
weak 30.0 inch troughing will extend over lake superior from a 29.7
inch low over the northern plains tonight into saturday. 30.1 inch
ridging returns late saturday into sunday and strengthens to 30.2
inches by monday as a 30.3 inch high builds over james bay and
quebec.
lsz266-130800-
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-
1001 pm edt fri sep 12 2025
.rest of tonight...southeast winds 10 to 20 knots veering south
after midnight, then diminishing to 5 to 15 knots late. patchy
fog. a chance of showers and a slight chance of thunderstorms.
waves calm to 2 feet.
.saturday...south winds 5 to 15 knots backing east in the
afternoon, then backing northeast late. patchy fog through early
afternoon. waves calm to 2 feet.
.saturday night...northeast winds 5 to 15 knots veering east
late. waves calm to 2 feet.
.sunday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves calm to 2 feet.
.sunday night...east winds 5 to 15 knots veering southeast after
midnight. waves calm to 2 feet.
.monday...southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. waves calm to 2 feet.
.monday night...southeast winds 10 to 20 knots veering south
after midnight. waves calm to 2 feet.
.tuesday...south winds 10 to 20 knots. waves calm to 2 feet.
.wednesday...south winds 10 to 20 knots. a chance of showers.
waves calm to 2 feet.
$$
(12/12)
Latest Great Lakes Marine Forecast by KMQT
Issued 9/12/2025 10:01 PM America/New_York.
Valid through 9/13/2025 4:00 AM America/New_York.
fzus63 kmqt 130201
glfls
expires:202509130800;;885375
open lake forecast for lake superior
national weather service marquette mi
1001 pm edt fri sep 12 2025
for waters beyond 5 nautical miles of shore on lake superior.
waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.
.synopsis...
weak 30.0 inch troughing will extend over lake superior from a 29.7
inch low over the northern plains tonight into saturday. 30.1 inch
ridging returns late saturday into sunday and strengthens to 30.2
inches by monday as a 30.3 inch high builds over james bay and
quebec.
lsz263-130800-
lake superior from saxon harbor wi to upper entrance to portage
canal mi 5nm off shore to the us/canadian border including isle
royale national park-
1001 pm edt fri sep 12 2025
.rest of tonight...east winds 5 to 15 knots backing northeast
late. patchy fog. a slight chance of thunderstorms by midnight. a
chance of showers. waves calm to 2 feet.
.saturday...northeast winds 5 to 15 knots. waves building to 1 to
3 feet.
.saturday night...east winds 5 to 15 knots. waves subsiding to
calm to 2 feet.
.sunday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves building to 1 to 3 feet.
.sunday night...east winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. waves subsiding to calm to 2 feet.
.monday...southeast winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet.
.monday night...east winds 5 to 15 knots veering south after
midnight. waves calm to 2 feet.
.tuesday...south winds 5 to 15 knots. waves calm to 2 feet.
.wednesday...southwest winds 5 to 15 knots backing south. a
chance of showers. waves calm to 2 feet.
$$
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