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(1/10)
Latest Great Lakes Marine Forecast by KDTX
Issued 4/20/2026 3:34 PM America/New_York.
Valid through 4/21/2026 12:00 AM America/New_York.
fzus63 kdtx 201934
glflh
expires:202604210400;;707074
open lake forecast for lake huron
national weather service detroit/pontiac mi
334 pm edt mon apr 20 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 dominates conditions through this
evening, then gusty south wind develops overnight into tuesday. a
cold front passes through the region tuesday night, followed by a
weaker area of high pressure on wednesday. a warm front then
slowly lifts into the area late thursday into friday as the
parent low pressure stalls over the upper midwest.
lhz361>363-210400-
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-
lake huron from sturgeon point to alabaster mi beyond 5nm off
shore-
334 pm edt mon apr 20 2026
.tonight...southeast winds 10 to 15 knots becoming south 15 to
20 knots with gusts to around 30 knots in the late evening and
overnight. waves 2 to 4 feet building to 5 to 7 feet in the late
evening and overnight. waves occasionally around 10 feet.
.tuesday...south winds 15 to 20 knots with gusts to around
30 knots decreasing to 10 to 15 knots early in the afternoon...
then backing to the southeast late in the afternoon. waves 6 to
9 feet. waves occasionally around 12 feet.
.tuesday night...north winds 5 to 10 knots. waves 3 to 5 feet
subsiding to 1 to 3 feet after midnight.
.wednesday...north winds 5 to 10 knots until late afternoon
becoming light and variable. waves 2 feet or less.
.wednesday night...light and variable winds becoming southeast
5 to 10 knots after midnight. waves 2 feet or less.
.thursday...southeast winds 5 to 10 knots becoming east 15 to
20 knots. waves 1 to 3 feet building to 5 to 7 feet. waves
occasionally around 10 feet.
.friday...east winds 15 to 20 knots decreasing to 10 to 15 knots
early in the evening...then increasing to 15 to 20 knots by
midnight. a chance of showers in the late morning and early
afternoon. rain showers likely . waves 5 to 7 feet. waves
occasionally around 10 feet.
.saturday...northeast winds 15 to 20 knots becoming north 10 to
15 knots. a chance of showers early in the morning. waves 3 to
5 feet.
$$
(2/10)
Latest Great Lakes Marine Forecast by KDTX
Issued 4/20/2026 3:34 PM America/New_York.
Valid through 4/21/2026 12:00 AM America/New_York.
fzus63 kdtx 201934
glflh
expires:202604210400;;707075
open lake forecast for lake huron
national weather service detroit/pontiac mi
334 pm edt mon apr 20 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 dominates conditions through this
evening, then gusty south wind develops overnight into tuesday. a
cold front passes through the region tuesday night, followed by a
weaker area of high pressure on wednesday. a warm front then
slowly lifts into the area late thursday into friday as the
parent low pressure stalls over the upper midwest.
lhz462>464-210400-
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-
334 pm edt mon apr 20 2026
.tonight...southeast winds 5 to 10 knots becoming south 15 to
20 knots with gusts to around 30 knots. waves 1 to 3 feet
building to 3 to 5 feet after midnight.
.tuesday...south winds 20 to 25 knots with gusts to around
30 knots decreasing to 10 to 15 knots. a chance of showers in the
morning. waves 5 to 7 feet. waves occasionally around 10 feet.
.tuesday night...southeast winds 5 to 10 knots. waves 2 to 4 feet
subsiding to 2 feet or less in the late evening and overnight.
.wednesday...north winds 5 to 10 knots. waves 2 feet or less.
.wednesday night...north winds 5 to 10 knots early in the evening
becoming light and variable. waves 2 feet or less.
.thursday...southeast winds 5 to 10 knots increasing to 10 to
15 knots late in the afternoon. waves 1 to 3 feet.
.friday...southeast winds 10 to 15 knots. showers likely . waves
2 to 4 feet.
.saturday...east winds 10 to 15 knots backing to the north in the
late morning and early afternoon...then decreasing to 5 to
10 knots . a chance of showers until afternoon. waves 2 to
4 feet.
$$
(3/10)
Latest Great Lakes Marine Forecast by KMKX
Issued 4/20/2026 3:07 PM US/Central.
Valid through 4/20/2026 10:15 PM US/Central.
fzus63 kmkx 202007
glflm
expires:202604210315;;708364
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
307 pm cdt mon apr 20 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...
high pressure around 30.4 inches over lower michigan and low
pressure around 29.7 inches developing in the plains will bring
increasing southerly winds to lake michigan through tuesday
morning. a few gales are possible tonight into early tuesday
morning, especially over the northern third of the lake as low
pressure around 29.5 inches also progresses across the hudson bay.
a cold front from this low will progress southward through the
lake tuesday afternoon and evening, shifting winds to
northeasterly. high pressure around 30.4 inches builds into
ontario on wednesday, bringing light and variable winds. winds
will then become southeast and increase thursday into friday, as
strong low pressure around 29.2 inches develops in the northern
plains.
lmz261-362-364-366-563-565-567-868-210315-
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-
307 pm cdt mon apr 20 2026
sheboygan wi to pentwater mi north...
.tonight...south winds to 30 kt. waves 4 to 7 ft occasionally to
9 ft.
.tuesday...southwest winds 15 to 25 kt diminishing to 10 to 20 kt
late in the morning, then diminishing to 10 to 15 kt early in the
afternoon becoming west late. waves 4 to 7 ft occasionally to
9 ft subsiding to 3 to 5 ft.
.tuesday night...northeast winds 5 to 10 kt. waves 2 to 4 ft
subsiding to 1 to 3 ft.
.wednesday...northeast winds 5 to 10 kt. waves 1 to 2 ft.
.wednesday night...east winds 5 to 10 kt becoming southeast
overnight. waves 1 ft or less building to 1 to 3 ft.
.thursday...south winds 10 to 20 kt increasing to 15 to 25 kt.
waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.thursday night...southeast winds 15 to 25 kt increasing to
30 kt. chance of rain showers. waves 6 to 9 ft occasionally to
12 ft.
.friday...south winds 15 to 25 kt diminishing to 10 to 20 kt.
chance of rain showers. waves 5 to 8 ft occasionally to 10 ft
subsiding to 4 to 7 ft occasionally to 9 ft.
.saturday...north winds 10 to 20 kt. waves 3 to 5 ft.
$$
(4/10)
Latest Great Lakes Marine Forecast by KMKX
Issued 4/20/2026 3:07 PM US/Central.
Valid through 4/20/2026 10:15 PM US/Central.
fzus63 kmkx 202007
glflm
expires:202604210315;;708365
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
307 pm cdt mon apr 20 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...
high pressure around 30.4 inches over lower michigan and low
pressure around 29.7 inches developing in the plains will bring
increasing southerly winds to lake michigan through tuesday
morning. a few gales are possible tonight into early tuesday
morning, especially over the northern third of the lake as low
pressure around 29.5 inches also progresses across the hudson bay.
a cold front from this low will progress southward through the
lake tuesday afternoon and evening, shifting winds to
northeasterly. high pressure around 30.4 inches builds into
ontario on wednesday, bringing light and variable winds. winds
will then become southeast and increase thursday into friday, as
strong low pressure around 29.2 inches develops in the northern
plains.
lmz080-669-671-673-675-777-779-870-872-874-876-878-210315-
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-
307 pm cdt mon apr 20 2026
sheboygan wi to pentwater mi south...
.tonight...southeast winds 15 to 25 kt becoming south. waves 4 to
7 ft occasionally to 9 ft.
.tuesday...south 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.
.tuesday night...northeast winds 10 to 15 kt becoming north 5 to
10 kt. waves 2 to 4 ft subsiding to 1 to 2 ft.
.wednesday...northeast winds 5 to 10 kt becoming north. waves
1 to 2 ft.
.wednesday night...east winds 5 to 10 kt becoming south 10 to
15 kt. waves 1 ft or less building to 1 to 3 ft.
.thursday...south winds 10 to 20 kt increasing to 15 to 25 kt.
waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.thursday night...south winds 15 to 25 kt. chance of showers.
waves 5 to 8 ft occasionally to 10 ft.
.friday...south winds 15 to 25 kt diminishing to 10 to 20 kt.
showers likely. waves 5 to 8 ft occasionally to 10 ft subsiding
to 4 to 7 ft occasionally to 9 ft.
.saturday...north winds 10 to 20 kt. waves 4 to 6 ft occasionally
to 8 ft.
$$
(5/10)
Latest Great Lakes Marine Forecast by KMQT
Issued 4/20/2026 4:01 PM America/New_York.
Valid through 4/21/2026 4:00 AM America/New_York.
fzus63 kmqt 202001
glfls
expires:202604210800;;707917
open lake forecast for lake superior
national weather service marquette mi
400 pm edt mon apr 20 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 high pressure ridging over lake superior this afternoon
departs to the southeast this evening. a 29.1 inch low moving from
northern manitoba to hudson bay swings a 29.8 inch trough across
lake superior tonight into tuesday morning. 30.0 inch high pressure
ridging returns over the lake by tuesday afternoon as the low
weakens over hudson bay. a 29.2 inch low then develops over the
northern rockies on wednesday and tracks into manitoba at around
29.5 inches on friday. this sends 29.6 inch troughing over lake
superior thursday night into friday. 30.1 inch ridging slowly
returns to lake superior on saturday.
lsz162-210800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt mon apr 20 2026 /300 pm cdt mon apr 20 2026/
.late this afternoon...south winds 15 to 25 knots. waves 1 to
3 feet building to 2 to 4 feet.
.tonight...southwest winds 10 to 20 knots becoming west 5 to
15 knots late. waves subsiding to calm to 2 feet.
.tuesday...northwest winds 5 to 15 knots backing southwest in the
afternoon, then backing south late. waves calm to 2 feet.
.tuesday night...south winds 5 to 15 knots backing northeast
after midnight, then veering east late. waves calm to 2 feet.
.wednesday...east winds 5 to 15 knots backing northeast by mid
afternoon. waves calm to 2 feet.
.wednesday night...northeast winds 10 to 20 knots veering east
after midnight. waves building to 1 to 3 feet.
.thursday...east winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. a chance of rain showers by mid
afternoon. waves building to 2 to 4 feet.
.thursday night...east winds 10 to 20 knots. rain showers and a
chance of thunderstorms. waves building to 4 to 7 feet
occasionally to 9 feet.
.friday...west winds 10 to 20 knots. waves subsiding to 2 to
4 feet.
.saturday...west winds 10 to 20 knots. waves subsiding to calm to
2 feet.
$$
(6/10)
Latest Great Lakes Marine Forecast by KMQT
Issued 4/20/2026 4:01 PM America/New_York.
Valid through 4/21/2026 4:00 AM America/New_York.
fzus63 kmqt 202001
glfls
expires:202604210800;;707918
open lake forecast for lake superior
national weather service marquette mi
400 pm edt mon apr 20 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 high pressure ridging over lake superior this afternoon
departs to the southeast this evening. a 29.1 inch low moving from
northern manitoba to hudson bay swings a 29.8 inch trough across
lake superior tonight into tuesday morning. 30.0 inch high pressure
ridging returns over the lake by tuesday afternoon as the low
weakens over hudson bay. a 29.2 inch low then develops over the
northern rockies on wednesday and tracks into manitoba at around
29.5 inches on friday. this sends 29.6 inch troughing over lake
superior thursday night into friday. 30.1 inch ridging slowly
returns to lake superior on saturday.
lsz263-210800-
lake superior from saxon harbor wi to upper entrance to portage
canal mi 5nm off shore to the us/canadian border including isle
royale national park-
400 pm edt mon apr 20 2026
.late this afternoon...south winds 15 to 25 knots. waves 2 to
4 feet.
.tonight...southwest winds 15 to 25 knots becoming west 10 to
20 knots late. waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 1 to 3 feet.
.tuesday...northwest winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then becoming southwest 5 to 15 knots
late. waves subsiding to calm to 2 feet.
.tuesday night...south winds less than 10 knots backing southeast
after midnight. waves calm to 2 feet.
.wednesday...southeast winds less than 10 knots becoming east
5 to 15 knots by mid afternoon. waves calm to 2 feet.
.wednesday night...east winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. waves building to 2 to 4 feet.
.thursday...southeast winds 10 to 20 knots becoming east 15 to
25 knots by mid afternoon. waves building to 4 to 7 feet
occasionally to 9 feet.
.thursday night...southeast winds 20 to 30 knots. rain showers
likely and a chance of thunderstorms. waves building to 7 to
10 feet occasionally to 13 feet.
.friday...west winds 20 to 30 knots diminishing to 15 to
25 knots. a chance of rain showers. waves subsiding to 3 to
6 feet occasionally to 8 feet.
.saturday...west winds 15 to 25 knots diminishing to 5 to
15 knots. waves subsiding to 2 to 4 feet.
$$
(7/10)
Latest Great Lakes Marine Forecast by KMQT
Issued 4/20/2026 4:01 PM America/New_York.
Valid through 4/21/2026 4:00 AM America/New_York.
fzus63 kmqt 202001
glfls
expires:202604210800;;707919
open lake forecast for lake superior
national weather service marquette mi
400 pm edt mon apr 20 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 high pressure ridging over lake superior this afternoon
departs to the southeast this evening. a 29.1 inch low moving from
northern manitoba to hudson bay swings a 29.8 inch trough across
lake superior tonight into tuesday morning. 30.0 inch high pressure
ridging returns over the lake by tuesday afternoon as the low
weakens over hudson bay. a 29.2 inch low then develops over the
northern rockies on wednesday and tracks into manitoba at around
29.5 inches on friday. this sends 29.6 inch troughing over lake
superior thursday night into friday. 30.1 inch ridging slowly
returns to lake superior on saturday.
lsz264-210800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 pm edt mon apr 20 2026
.late this afternoon...south winds 10 to 20 knots. waves 2 to
4 feet.
.tonight...south winds 15 to 25 knots veering southwest after
midnight, then becoming west 10 to 20 knots late. waves building
to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.tuesday...northwest winds 5 to 15 knots backing west late. waves
subsiding to calm to 2 feet.
.tuesday night...southwest winds less than 10 knots backing
southeast late. waves calm to 2 feet.
.wednesday...southeast winds 5 to 15 knots. waves calm to 2 feet.
.wednesday night...southeast winds 10 to 20 knots. waves building
to 2 to 4 feet.
.thursday...southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. waves building to 5 to 8 feet
occasionally to 10 feet.
.thursday night...southeast gales to 35 knots. a chance of rain
showers through midnight. a chance of thunderstorms. rain showers
likely after midnight. waves building to 8 to 11 feet
occasionally to 14 feet.
.friday...southeast winds 20 to 30 knots becoming west 10 to
20 knots. a chance of rain showers. waves subsiding to 3 to
6 feet occasionally to 8 feet.
.saturday...west winds 10 to 20 knots diminishing to 5 to
15 knots. waves subsiding to 2 to 4 feet.
$$
(8/10)
Latest Great Lakes Marine Forecast by KMQT
Issued 4/20/2026 4:01 PM America/New_York.
Valid through 4/21/2026 4:00 AM America/New_York.
fzus63 kmqt 202001
glfls
expires:202604210800;;707920
open lake forecast for lake superior
national weather service marquette mi
400 pm edt mon apr 20 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 high pressure ridging over lake superior this afternoon
departs to the southeast this evening. a 29.1 inch low moving from
northern manitoba to hudson bay swings a 29.8 inch trough across
lake superior tonight into tuesday morning. 30.0 inch high pressure
ridging returns over the lake by tuesday afternoon as the low
weakens over hudson bay. a 29.2 inch low then develops over the
northern rockies on wednesday and tracks into manitoba at around
29.5 inches on friday. this sends 29.6 inch troughing over lake
superior thursday night into friday. 30.1 inch ridging slowly
returns to lake superior on saturday.
lsz265-210800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 pm edt mon apr 20 2026
.late this afternoon...south winds 15 to 25 knots. waves calm to
2 feet building to 1 to 3 feet.
.tonight...south winds 20 to 30 knots becoming southwest 15 to
25 knots late. waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.tuesday...west winds 10 to 20 knots veering north in the
afternoon, then diminishing to 5 to 15 knots late. waves
subsiding to calm to 2 feet.
.tuesday night...south winds 5 to 15 knots veering west after
midnight, then backing southwest late. waves calm to 2 feet.
.wednesday...southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. waves calm to 2 feet.
.wednesday night...southeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves building to 2 to 4 feet.
.thursday...southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. waves building to 5 to 8 feet
occasionally to 10 feet.
.thursday night...southeast gales to 35 knots. a chance of
showers through midnight. showers likely after midnight. waves
building to 6 to 9 feet occasionally to 11 feet.
.friday...southeast winds 20 to 30 knots becoming west 15 to
25 knots. a chance of rain showers. waves subsiding to 2 to
4 feet.
.saturday...west winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
$$
(9/10)
Latest Great Lakes Marine Forecast by KMQT
Issued 4/20/2026 4:01 PM America/New_York.
Valid through 4/21/2026 4:00 AM America/New_York.
fzus63 kmqt 202001
glfls
expires:202604210800;;707921
open lake forecast for lake superior
national weather service marquette mi
400 pm edt mon apr 20 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 high pressure ridging over lake superior this afternoon
departs to the southeast this evening. a 29.1 inch low moving from
northern manitoba to hudson bay swings a 29.8 inch trough across
lake superior tonight into tuesday morning. 30.0 inch high pressure
ridging returns over the lake by tuesday afternoon as the low
weakens over hudson bay. a 29.2 inch low then develops over the
northern rockies on wednesday and tracks into manitoba at around
29.5 inches on friday. this sends 29.6 inch troughing over lake
superior thursday night into friday. 30.1 inch ridging slowly
returns to lake superior on saturday.
lsz266-210800-
lake superior east of a line from manitou island to marquette mi
and west of a line from grand marais mi to the us/canadian border
beyond 5nm from shore-
400 pm edt mon apr 20 2026
...gale warning in effect from 8 pm this evening to 4 am edt
tuesday...
.late this afternoon...south winds 20 to 30 knots. waves 1 to
3 feet building to 2 to 4 feet.
.tonight...south gales to 35 knots becoming southwest 20 to
30 knots late. waves building to 6 to 9 feet occasionally to
11 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.tuesday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. waves subsiding to calm to 2 feet.
.tuesday night...northwest winds 5 to 15 knots veering north
late. waves calm to 2 feet.
.wednesday...southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. waves calm to 2 feet.
.wednesday night...southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves building to 2 to 4 feet.
.thursday...southeast winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. waves building to 5 to 8 feet
occasionally to 10 feet.
.thursday night...southeast gales to 40 knots. a chance of rain
showers. waves building to 8 to 11 feet occasionally to 14 feet.
.friday...southeast gales to 35 knots becoming west 15 to
25 knots. rain showers likely. waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.saturday...west winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
$$
(10/10)
Latest Great Lakes Marine Forecast by KMQT
Issued 4/20/2026 4:01 PM America/New_York.
Valid through 4/21/2026 4:00 AM America/New_York.
fzus63 kmqt 202001
glfls
expires:202604210800;;707922
open lake forecast for lake superior
national weather service marquette mi
400 pm edt mon apr 20 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 high pressure ridging over lake superior this afternoon
departs to the southeast this evening. a 29.1 inch low moving from
northern manitoba to hudson bay swings a 29.8 inch trough across
lake superior tonight into tuesday morning. 30.0 inch high pressure
ridging returns over the lake by tuesday afternoon as the low
weakens over hudson bay. a 29.2 inch low then develops over the
northern rockies on wednesday and tracks into manitoba at around
29.5 inches on friday. this sends 29.6 inch troughing over lake
superior thursday night into friday. 30.1 inch ridging slowly
returns to lake superior on saturday.
lsz267-210800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 pm edt mon apr 20 2026
...gale warning in effect from 8 pm this evening to 4 am edt
tuesday...
.late this afternoon...southeast winds 15 to 25 knots. waves calm
to 2 feet building to 1 to 3 feet.
.tonight...south gales to 35 knots becoming southwest 20 to
30 knots late. waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.tuesday...southwest winds 10 to 20 knots veering northwest in
the afternoon. waves subsiding to 1 to 3 feet.
.tuesday night...northwest winds 5 to 15 knots veering north
late. waves subsiding to calm to 2 feet.
.wednesday...southeast winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet.
.wednesday night...southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. waves building to 1 to 3 feet.
.thursday...southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. waves building to 3 to 6 feet
occasionally to 8 feet.
.thursday night...southeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. a chance of rain showers. waves
building to 5 to 8 feet occasionally to 10 feet.
.friday...southeast winds 20 to 30 knots diminishing to 15 to
25 knots. rain showers likely, then a chance of rain showers.
waves subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.saturday...west winds 10 to 20 knots. waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
$$
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