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(1/11)
Latest Great Lakes Marine Forecast by KDTX
Issued 8/4/2026 2:56 PM America/New_York.
Valid through 8/4/2026 11:00 PM America/New_York.
fzus63 kdtx 041856
glflh
expires:202608050300;;621245
open lake forecast for lake huron
national weather service detroit/pontiac mi
256 pm edt tue aug 4 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...high pressure, 30.00 inches, retreats toward the mid
atlantic tonight. a slow moving cold front will move into lake
huron wednesday triggering showers and a chance for thunderstorms
across the region through the end of the workweek.
lhz361-050300-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
256 pm edt tue aug 4 2026
.tonight...northeast winds 5 to 10 knots early in the evening
becoming light and variable...then becoming south 5 to 10 knots
after midnight. a chance of showers after midnight. waves 2 to
4 feet subsiding to 1 to 3 feet after midnight.
.wednesday...north winds 5 to 10 knots early in the morning
becoming light and variable...then becoming southwest 5 to
10 knots late in the afternoon. showers likely in the morning...
then a chance of showers in the afternoon. waves 2 feet or less.
.wednesday night...west winds 5 to 10 knots early in the evening
becoming light and variable. waves 2 feet or less.
.thursday...light and variable winds. waves 2 feet or less.
.thursday night...light and variable winds becoming south 5 to
10 knots in the late evening and overnight. waves 2 feet or less.
.friday...south winds 5 to 10 knots backing to the east late in
the afternoon...then veering to the south late in the evening.
waves 2 feet or less.
.saturday...southwest winds 5 to 10 knots becoming west 10 to
15 knots early in the evening...then becoming light and variable
by midnight. waves 2 feet or less.
.sunday...southwest winds 5 to 10 knots veering to the west by
midnight. waves 2 feet or less.
$$
(2/11)
Latest Great Lakes Marine Forecast by KDTX
Issued 8/4/2026 2:56 PM America/New_York.
Valid through 8/4/2026 11:00 PM America/New_York.
fzus63 kdtx 041856
glflh
expires:202608050300;;621246
open lake forecast for lake huron
national weather service detroit/pontiac mi
256 pm edt tue aug 4 2026
for waters beyond five nautical miles off shore on lake huron
waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.
.synopsis...high pressure, 30.00 inches, retreats toward the mid
atlantic tonight. a slow moving cold front will move into lake
huron wednesday triggering showers and a chance for thunderstorms
across the region through the end of the workweek.
lhz362-363-050300-
lake huron from presque isle light to sturgeon point mi beyond
5nm off shore-
lake huron from sturgeon point to alabaster mi beyond 5nm off
shore-
256 pm edt tue aug 4 2026
.tonight...south winds 10 to 15 knots decreasing to 5 to 10 knots
early in the morning. waves 3 to 5 feet.
.wednesday...south winds 5 to 10 knots. a chance of showers.
waves 2 to 4 feet subsiding to 1 to 3 feet in the late morning
and afternoon.
.wednesday night...southeast winds 5 to 10 knots early in the
evening becoming light and variable. a chance of showers. waves
2 feet or less.
.thursday...light and variable winds. a chance of showers. waves
2 feet or less.
.thursday night...light and variable winds. waves 2 feet or less.
.friday...light and variable winds becoming southeast 5 to
10 knots late in the afternoon. waves 2 feet or less.
.saturday...southwest winds 5 to 10 knots backing to the east
early in the evening...then becoming light and variable by
midnight. waves 1 to 3 feet.
.sunday...southwest winds 5 to 10 knots. a chance of showers.
waves 1 to 3 feet.
$$
(3/11)
Latest Great Lakes Marine Forecast by KDTX
Issued 8/4/2026 2:56 PM America/New_York.
Valid through 8/4/2026 11:00 PM America/New_York.
fzus63 kdtx 041856
glflh
expires:202608050300;;621247
open lake forecast for lake huron
national weather service detroit/pontiac mi
256 pm edt tue aug 4 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...high pressure, 30.00 inches, retreats toward the mid
atlantic tonight. a slow moving cold front will move into lake
huron wednesday triggering showers and a chance for thunderstorms
across the region through the end of the workweek.
lhz462>464-050300-
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-
256 pm edt tue aug 4 2026
.tonight...south winds 10 to 15 knots. waves 1 to 3 feet building
to 2 to 4 feet in the late evening and overnight.
.wednesday...south winds 5 to 10 knots backing to the southeast
late in the afternoon. waves 1 to 3 feet.
.wednesday night...north winds 5 to 10 knots veering to the south
by midnight...then veering to the south 5 to 10 knots after
midnight. showers likely after midnight. waves 2 feet or less.
.thursday...north winds 5 to 10 knots. showers likely. waves
2 feet or less.
.thursday night...north winds 5 to 10 knots early in the evening
becoming light and variable. waves 2 feet or less.
.friday...light and variable winds becoming south 5 to 10 knots
late in the evening. waves 2 feet or less.
.saturday...southwest winds 5 to 10 knots. a chance of showers
early in the evening. waves 2 feet or less.
.sunday...southwest winds 5 to 10 knots. a chance of showers.
waves 1 to 3 feet.
$$
(4/11)
Latest Great Lakes Marine Forecast by KMKX
Issued 8/4/2026 1:55 PM US/Central.
Valid through 8/4/2026 10:15 PM US/Central.
fzus63 kmkx 041855
glflm
expires:202608050315;;621242
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
155 pm cdt tue aug 4 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...
30.1 inch high pressure is centered between lakes erie and ontario
this afternoon, resulting in generally southerly winds across the
open waters. a cold front is moving into western wisconsin, and
will approach lake michigan through the remainder of the afternoon.
the front will slowly move across the waters this evening into
wednesday morning, bringing a brief north-northwest wind shift.
periods of showers and storms will accompany the slow-moving
front, with severe weather appearing unlikely at this time. winds
will trend variable wednesday evening through thursday, when 30.1
inch high pressure is forecast to build back into the western
great lakes.
a prolonged period of south-southwest winds will become established
across lake michigan thursday night through sunday as 30.1 inch
high pressure lingers off the mid-atlantic coast and 29.6 inch
low pressure stalls over the hudson bay. a slow-moving surface
front will linger across the western great lakes saturday into the
beginning of next week, bringing multiple periods of showers and
thunderstorms. some of these storms could be stronger, with
additional details clarifying through the end of this week.
lmz261-362-364-366-563-565-567-868-050315-
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-
155 pm cdt tue aug 4 2026
sheboygan wi to pentwater mi north...
.tonight...southwest winds 15 to 25 kt diminishing to 10 to 20 kt
late this evening, then backing to east 10 to 15 kt after
midnight becoming northeast late. chance of showers and
thunderstorms this evening, then chance of showers and slight
chance of thunderstorms overnight. patchy fog overnight. waves
4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
.wednesday...northeast winds 10 to 15 kt diminishing to 5 to
10 kt. patchy fog in the morning. chance of showers and slight
chance of thunderstorms in the morning, then slight chance of
showers in the afternoon. waves 1 to 3 ft subsiding to 1 to 2 ft.
.wednesday night...southeast winds 5 to 10 kt. waves 1 ft or
less.
.thursday...south winds 10 to 15 kt becoming southwest. waves
1 ft or less.
.thursday night...south winds 10 to 15 kt becoming southwest
10 to 20 kt. waves 1 to 2 ft.
.friday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 2 to 4 ft.
.friday night...south winds 15 to 25 kt becoming southwest. waves
2 to 4 ft.
.saturday...southwest winds 15 to 25 kt. waves 1 to 3 ft.
.sunday...southwest winds 15 to 25 kt. waves 2 to 4 ft.
$$
(5/11)
Latest Great Lakes Marine Forecast by KMKX
Issued 8/4/2026 1:55 PM US/Central.
Valid through 8/4/2026 10:15 PM US/Central.
fzus63 kmkx 041855
glflm
expires:202608050315;;621243
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
155 pm cdt tue aug 4 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...
30.1 inch high pressure is centered between lakes erie and ontario
this afternoon, resulting in generally southerly winds across the
open waters. a cold front is moving into western wisconsin, and
will approach lake michigan through the remainder of the afternoon.
the front will slowly move across the waters this evening into
wednesday morning, bringing a brief north-northwest wind shift.
periods of showers and storms will accompany the slow-moving
front, with severe weather appearing unlikely at this time. winds
will trend variable wednesday evening through thursday, when 30.1
inch high pressure is forecast to build back into the western
great lakes.
a prolonged period of south-southwest winds will become established
across lake michigan thursday night through sunday as 30.1 inch
high pressure lingers off the mid-atlantic coast and 29.6 inch
low pressure stalls over the hudson bay. a slow-moving surface
front will linger across the western great lakes saturday into the
beginning of next week, bringing multiple periods of showers and
thunderstorms. some of these storms could be stronger, with
additional details clarifying through the end of this week.
lmz080-669-671-673-675-777-779-870-872-874-876-878-050315-
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-
155 pm cdt tue aug 4 2026
sheboygan wi to pentwater mi south...
.tonight...south winds 15 to 25 kt diminishing to 10 to 20 kt
late this evening, then becoming southwest after midnight
diminishing to 10 to 15 kt late. chance of showers and slight
chance of thunderstorms overnight. waves 3 to 5 ft subsiding to
2 to 4 ft.
.wednesday...southwest winds 10 to 15 kt diminishing to 5 to
10 kt. 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.
.wednesday night...west winds 5 to 10 kt becoming north. chance
of showers and thunderstorms. waves 1 to 2 ft.
.thursday...northeast winds 5 to 10 kt becoming north 10 to
15 kt. chance of showers in the morning. waves 1 ft or less.
.thursday night...east winds 5 to 10 kt veering to southwest.
waves 1 ft or less.
.friday...southwest winds 5 to 10 kt becoming south 10 to 20 kt
in the afternoon. waves 1 to 2 ft.
.friday night...south winds 10 to 20 kt becoming southwest 10 to
15 kt. waves 1 to 3 ft.
.saturday...southwest winds 10 to 20 kt becoming south. waves
1 to 3 ft.
.sunday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 2 to 4 ft.
$$
(6/11)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/4/2026 4:01 PM America/New_York.
Valid through 8/5/2026 4:00 AM America/New_York.
fzus63 kmqt 042001
glfls
expires:202608050800;;623092
open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 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...
troughing to 29.9 remains over lake superior tonight before 30.0
inch ridging returns on wednesday as high pressure builds into the
great lakes from the northern plains. for the late week and into the
weekend, pressure over lake superior will remain around 29.9 to 30.0
inches between a 30.3 inch bermuda high and 29.5 inch low pressure
near the western shores of hudson bay.
lsz162-050800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt tue aug 4 2026 /301 pm cdt tue aug 4 2026/
.late this afternoon...southwest winds 15 to 25 knots. waves 2 to
4 feet subsiding to 1 to 3 feet.
.tonight...west winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. waves subsiding to calm to 2 feet.
.wednesday...southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then becoming south 5 to 15 knots
late. waves calm to 2 feet.
.wednesday night...south winds 5 to 15 knots veering southwest
late. waves calm to 2 feet.
.thursday...southwest winds 15 to 25 knots. waves building to
1 to 3 feet.
.thursday night...southwest winds 15 to 25 knots. waves building
to 2 to 4 feet.
.friday...southwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. a chance of showers. a chance of
thunderstorms by mid afternoon. waves subsiding to calm to
2 feet.
.friday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet.
.saturday...southwest winds 10 to 20 knots becoming west 5 to
15 knots. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.sunday...west winds 10 to 20 knots becoming northwest 5 to
15 knots. waves calm to 2 feet.
$$
(7/11)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/4/2026 4:01 PM America/New_York.
Valid through 8/5/2026 4:00 AM America/New_York.
fzus63 kmqt 042001
glfls
expires:202608050800;;623093
open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 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...
troughing to 29.9 remains over lake superior tonight before 30.0
inch ridging returns on wednesday as high pressure builds into the
great lakes from the northern plains. for the late week and into the
weekend, pressure over lake superior will remain around 29.9 to 30.0
inches between a 30.3 inch bermuda high and 29.5 inch low pressure
near the western shores of hudson bay.
lsz263-050800-
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-
401 pm edt tue aug 4 2026
.late this afternoon...southwest winds 15 to 25 knots. waves 2 to
4 feet.
.tonight...west winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. waves subsiding to calm to 2 feet.
.wednesday...southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing south late. waves
building to 1 to 3 feet.
.wednesday night...south winds 5 to 15 knots becoming southwest
10 to 20 knots late. waves subsiding to calm to 2 feet.
.thursday...southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.thursday night...south winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet.
.friday...southwest winds 15 to 25 knots. a chance of showers. a
chance of thunderstorms by mid afternoon. waves subsiding to 1 to
3 feet.
.friday night...west winds 5 to 15 knots. waves subsiding to calm
to 2 feet.
.saturday...west winds 15 to 25 knots diminishing to 10 to
20 knots. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.sunday...west winds 10 to 20 knots diminishing to 5 to 15 knots.
waves calm to 2 feet.
$$
(8/11)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/4/2026 4:01 PM America/New_York.
Valid through 8/5/2026 4:00 AM America/New_York.
fzus63 kmqt 042001
glfls
expires:202608050800;;623094
open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 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...
troughing to 29.9 remains over lake superior tonight before 30.0
inch ridging returns on wednesday as high pressure builds into the
great lakes from the northern plains. for the late week and into the
weekend, pressure over lake superior will remain around 29.9 to 30.0
inches between a 30.3 inch bermuda high and 29.5 inch low pressure
near the western shores of hudson bay.
lsz264-050800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 pm edt tue aug 4 2026
.late this afternoon...southwest winds 15 to 25 knots. waves 2 to
4 feet.
.tonight...west winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. waves subsiding to calm to 2 feet.
.wednesday...southwest winds 5 to 15 knots backing south late.
waves calm to 2 feet.
.wednesday night...south winds 5 to 15 knots. waves calm to
2 feet.
.thursday...southwest winds 10 to 20 knots. waves building to
2 to 4 feet.
.thursday night...south winds 15 to 25 knots veering southwest
after midnight. waves subsiding to 1 to 3 feet, then building to
3 to 5 feet occasionally to 7 feet.
.friday...southwest winds 10 to 20 knots. a chance of showers.
waves subsiding to 1 to 3 feet.
.friday night...west winds 5 to 15 knots. a chance of showers
through midnight. waves subsiding to calm to 2 feet.
.saturday...southwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves calm to 2 feet.
.sunday...west winds 5 to 15 knots. waves calm to 2 feet.
$$
(9/11)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/4/2026 4:01 PM America/New_York.
Valid through 8/5/2026 4:00 AM America/New_York.
fzus63 kmqt 042001
glfls
expires:202608050800;;623095
open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 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...
troughing to 29.9 remains over lake superior tonight before 30.0
inch ridging returns on wednesday as high pressure builds into the
great lakes from the northern plains. for the late week and into the
weekend, pressure over lake superior will remain around 29.9 to 30.0
inches between a 30.3 inch bermuda high and 29.5 inch low pressure
near the western shores of hudson bay.
lsz265-050800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 pm edt tue aug 4 2026
.late this afternoon...west winds 10 to 20 knots. waves calm to
2 feet.
.tonight...west winds 10 to 20 knots backing southwest after
midnight. waves calm to 2 feet.
.wednesday...southwest winds 5 to 15 knots backing east late.
waves calm to 2 feet.
.wednesday night...south winds 10 to 20 knots. waves calm to
2 feet.
.thursday...southwest winds 10 to 20 knots backing south by mid
afternoon. waves calm to 2 feet.
.thursday night...south winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight. waves building to 1 to 3 feet.
.friday...southwest winds 15 to 25 knots becoming south 10 to
20 knots by mid afternoon. a chance of showers by mid afternoon.
waves subsiding to calm to 2 feet.
.friday night...west winds 10 to 20 knots increasing to 15 to
25 knots after midnight. a chance of showers. waves calm to
2 feet.
.saturday...west winds 10 to 20 knots backing southwest. waves
calm to 2 feet.
.sunday...west winds 10 to 20 knots. waves calm to 2 feet.
$$
(10/11)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/4/2026 4:01 PM America/New_York.
Valid through 8/5/2026 4:00 AM America/New_York.
fzus63 kmqt 042001
glfls
expires:202608050800;;623096
open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 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...
troughing to 29.9 remains over lake superior tonight before 30.0
inch ridging returns on wednesday as high pressure builds into the
great lakes from the northern plains. for the late week and into the
weekend, pressure over lake superior will remain around 29.9 to 30.0
inches between a 30.3 inch bermuda high and 29.5 inch low pressure
near the western shores of hudson bay.
lsz266-050800-
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-
401 pm edt tue aug 4 2026
.late this afternoon...west winds 10 to 20 knots. waves 2 to
4 feet.
.tonight...west winds 5 to 15 knots backing southwest after
midnight. waves subsiding to calm to 2 feet.
.wednesday...southwest winds 5 to 15 knots backing east late.
waves calm to 2 feet.
.wednesday night...south winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet.
.thursday...south winds 10 to 20 knots. waves building to 1 to
3 feet.
.thursday night...south winds 15 to 25 knots increasing to 20 to
30 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.friday...south winds 15 to 25 knots. a chance of showers by mid
afternoon. waves subsiding to 1 to 3 feet.
.friday night...southwest winds 10 to 20 knots veering west after
midnight. a chance of showers. waves subsiding to calm to 2 feet.
.saturday...west winds 10 to 20 knots becoming southwest 5 to
15 knots. waves calm to 2 feet.
.sunday...west winds 5 to 15 knots. waves calm to 2 feet.
$$
(11/11)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/4/2026 4:01 PM America/New_York.
Valid through 8/5/2026 4:00 AM America/New_York.
fzus63 kmqt 042001
glfls
expires:202608050800;;623097
open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 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...
troughing to 29.9 remains over lake superior tonight before 30.0
inch ridging returns on wednesday as high pressure builds into the
great lakes from the northern plains. for the late week and into the
weekend, pressure over lake superior will remain around 29.9 to 30.0
inches between a 30.3 inch bermuda high and 29.5 inch low pressure
near the western shores of hudson bay.
lsz267-050800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 pm edt tue aug 4 2026
.late this afternoon...west winds 5 to 15 knots. a chance of
showers and a slight chance of thunderstorms. waves calm to
2 feet.
.tonight...southwest winds 5 to 15 knots backing south after
midnight. a slight chance of showers. patchy fog after midnight.
waves calm to 2 feet.
.wednesday...west winds 5 to 15 knots veering north late. waves
calm to 2 feet.
.wednesday night...south winds 5 to 15 knots. waves calm to
2 feet.
.thursday...south winds 5 to 15 knots. waves calm to 2 feet.
.thursday night...south winds 15 to 25 knots. waves building to
2 to 4 feet.
.friday...south winds 10 to 20 knots. waves subsiding to calm to
2 feet.
.friday night...south winds 10 to 20 knots veering west after
midnight. a chance of showers. waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.saturday...west winds 5 to 15 knots backing southwest. waves
calm to 2 feet.
.sunday...west winds 5 to 15 knots. waves calm to 2 feet.
$$
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