(1/10)
Latest Great Lakes Marine Forecast by KDTX
Issued 3/18/2026 3:57 PM America/New_York.
Valid through 3/19/2026 12:00 AM America/New_York.
fzus63 kdtx 181957
glflh
expires:202603190400;;915904
open lake forecast for lake huron
national weather service detroit/pontiac mi
357 pm edt wed mar 18 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...moderate southerly winds return as a warm front lifts
through the central great lakes region. expect a few flurries.
lighter winds on thursday as a weakening cold front approaches
and washes out. a clipper on friday then brings another uptick in
southerly wind.
lhz361-362-190400-
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-
357 pm edt wed mar 18 2026
.rest of today...south winds 20 to 25 knots. waves 6 to 9 feet.
waves occasionally around 12 feet.
.tonight...south winds 15 to 20 knots becoming southwest 10 to
15 knots after midnight. waves 6 to 9 feet. waves occasionally
around 12 feet.
.thursday...west winds 10 to 15 knots becoming northwest 5 to
10 knots in the late morning and afternoon. waves 3 to 5 feet
subsiding to 1 to 3 feet in the late morning and afternoon.
.thursday night...west winds 5 to 10 knots backing to the south
after midnight. a chance of snow after midnight. waves 2 feet or
less.
.friday...south winds 10 to 15 knots veering to the northwest
late in the afternoon. a chance of snow in the morning. a chance
of rain. waves 1 to 3 feet.
.saturday...west winds 10 to 15 knots backing to the southwest
early in the evening...then becoming north 20 to 25 knots by
midnight. a chance of rain and snow by midnight. waves 3 to
5 feet.
.sunday...northeast winds 20 to 25 knots. a chance of snow and
rain early in the morning. waves 6 to 9 feet. waves occasionally
around 12 feet.
wave heights are for ice free areas.
$$
(2/10)
Latest Great Lakes Marine Forecast by KDTX
Issued 3/18/2026 3:57 PM America/New_York.
Valid through 3/19/2026 12:00 AM America/New_York.
fzus63 kdtx 181957
glflh
expires:202603190400;;915905
open lake forecast for lake huron
national weather service detroit/pontiac mi
357 pm edt wed mar 18 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...moderate southerly winds return as a warm front lifts
through the central great lakes region. expect a few flurries.
lighter winds on thursday as a weakening cold front approaches
and washes out. a clipper on friday then brings another uptick in
southerly wind.
lhz363-462>464-190400-
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-
357 pm edt wed mar 18 2026
.rest of today...south winds 15 to 20 knots. waves 4 to 6 feet.
.tonight...south winds 15 to 20 knots decreasing to 10 to
15 knots after midnight. waves 4 to 6 feet. waves occasionally
around 8 feet.
.thursday...southwest winds 5 to 10 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet in the late morning and afternoon.
.thursday night...north winds 5 to 10 knots veering to the
northeast by midnight...then veering to the south after midnight.
waves 2 feet or less.
.friday...south winds 10 to 15 knots becoming west 5 to 10 knots
late in the afternoon...then veering to the northwest late in the
evening. a chance of rain. waves 1 to 3 feet.
.saturday...west winds 10 to 15 knots backing to the south early
in the evening...then becoming west 15 to 20 knots by midnight. a
chance of. waves 2 to 4 feet.
.sunday...north winds 20 to 25 knots. a chance of rain and snow
early in the morning. waves 6 to 9 feet building to 8 to 12 feet
by midnight. waves occasionally around 15 feet.
$$
(3/10)
Latest Great Lakes Marine Forecast by KMKX
Issued 3/18/2026 2:47 PM US/Central.
Valid through 3/18/2026 10:15 PM US/Central.
fzus63 kmkx 181947
glflm
expires:202603190315;;915816
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
247 pm cdt wed mar 18 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...
breezy south to southwest winds will continue through late
afternoon as low pressure of 29.8 inches pass by north of lake
michigan. high pressure of 30.2 inches will then move overhead
tonight and thursday, bringing lighter winds to the lake. light to
moderate south to southwest winds are expected thursday night
into early friday ahead of a cold front, with winds becoming
northerly through the day friday as the front drops through the
area. breezy southerly winds are likely saturday ahead of an
approaching low, with gusty northerly winds possible sunday
behind the low and associated cold front.
lmz261-362-364-366-563-565-567-868-190315-
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-
247 pm cdt wed mar 18 2026
sheboygan wi to pentwater mi north...
.tonight...southwest winds 15 to 25 kt becoming west 10 to 20 kt.
slight chance of rain overnight. waves 4 to 7 ft occasionally to
9 ft subsiding to 2 to 4 ft.
.thursday...northwest winds 10 to 15 kt becoming northeast 5 to
10 kt. waves 1 to 3 ft subsiding to 1 to 2 ft.
.thursday night...north winds 5 to 10 kt backing to southwest
10 to 15 kt. waves 1 to 3 ft.
.friday...southwest winds 10 to 15 kt increasing to 10 to 20 kt.
chance of light freezing rain in the morning. waves 1 to 3 ft.
.friday night...northwest winds 10 to 20 kt diminishing to 10 to
15 kt. waves 1 to 2 ft.
.saturday...southwest winds 10 to 15 kt increasing to 10 to
20 kt. waves 2 to 4 ft.
.saturday night...north winds 15 to 25 kt increasing to 30 kt.
chance of rain and snow. waves 4 to 6 ft occasionally to 8 ft
building to 6 to 9 ft occasionally to 12 ft.
.sunday...northeast winds to 30 kt. waves 7 to 10 ft occasionally
to 13 ft.
.monday...northeast winds 10 to 20 kt becoming north. waves 4 to
7 ft occasionally to 9 ft subsiding to 3 to 5 ft.
$$
(4/10)
Latest Great Lakes Marine Forecast by KMKX
Issued 3/18/2026 2:47 PM US/Central.
Valid through 3/18/2026 10:15 PM US/Central.
fzus63 kmkx 181947
glflm
expires:202603190315;;915817
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
247 pm cdt wed mar 18 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...
breezy south to southwest winds will continue through late
afternoon as low pressure of 29.8 inches pass by north of lake
michigan. high pressure of 30.2 inches will then move overhead
tonight and thursday, bringing lighter winds to the lake. light to
moderate south to southwest winds are expected thursday night
into early friday ahead of a cold front, with winds becoming
northerly through the day friday as the front drops through the
area. breezy southerly winds are likely saturday ahead of an
approaching low, with gusty northerly winds possible sunday
behind the low and associated cold front.
lmz080-669-671-673-675-777-779-870-872-874-876-878-190315-
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-
247 pm cdt wed mar 18 2026
sheboygan wi to pentwater mi south...
.tonight...southwest winds 10 to 20 kt becoming west 5 to 10 kt.
chance of rain overnight. waves 4 to 6 ft occasionally to 8 ft
subsiding to 2 to 4 ft.
.thursday...northwest winds 5 to 10 kt becoming northeast. chance
of rain in the morning. waves 1 to 2 ft.
.thursday night...north winds 5 to 10 kt veering to south. waves
1 to 2 ft.
.friday...south winds 10 to 15 kt becoming southwest. waves 1 to
3 ft.
.friday night...northwest winds 10 to 15 kt becoming north. waves
1 to 3 ft.
.saturday...southwest winds 10 to 15 kt becoming south. waves
2 to 4 ft.
.saturday night...southwest winds 10 to 20 kt veering to
northwest to 30 kt. waves 3 to 5 ft building to 6 to 9 ft
occasionally to 12 ft.
.sunday...north winds to 30 kt. waves 8 to 12 ft occasionally to
16 ft.
.monday...northeast winds 15 to 25 kt becoming north 10 to 20 kt.
waves 7 to 10 ft occasionally to 13 ft subsiding to 4 to 7 ft
occasionally to 9 ft.
$$
(5/10)
Latest Great Lakes Marine Forecast by KMQT
Issued 3/18/2026 4:01 PM America/New_York.
Valid through 3/19/2026 4:00 AM America/New_York.
fzus63 kmqt 182001
glfls
expires:202603190800;;916011
open lake forecast for lake superior
national weather service marquette mi
400 pm edt wed mar 18 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...
a 29.8 inch clipper low over northern ontario lifts towards james
bay this evening. behind this low, weak ridging of around 30.1
inches returns over lake superior on thursday ahead of another
clipper low moving through the lake thursday night into early friday
at around 29.7 inches. while a subsequent low moves through northern
ontario towards james bay late friday/friday night, yet another low
stretches into the northern plains around the same time. together,
these lows are expected to bring about troughing of around around
29.7 inch over lake superior on saturday. behind the troughing, 30.4
inch ridging builds into the great lakes and northern plains to
begin next week.
lsz162-190800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt wed mar 18 2026 /300 pm cdt wed mar 18 2026/
.late this afternoon...southwest winds 10 to 20 knots. waves 1 to
3 feet.
.tonight...west winds 5 to 15 knots veering north late. a slight
chance of rain and snow showers through midnight. waves subsiding
to calm to 2 feet.
.thursday...north winds 5 to 15 knots veering south in the
afternoon. a slight chance of rain and snow showers by mid
afternoon. waves calm to 2 feet.
.thursday night...southeast winds 5 to 15 knots becoming
southwest 10 to 20 knots after midnight, then veering west late.
a chance of snow showers through midnight. a slight chance of
rain showers. waves calm to 2 feet.
.friday...west winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. waves calm to 2 feet.
.friday night...west winds 5 to 15 knots. waves calm to 2 feet.
.saturday...northeast winds 10 to 20 knots. a chance of rain
showers through early afternoon. a chance of snow showers. waves
building to 1 to 3 feet.
.saturday night...northeast winds 15 to 25 knots. a chance of
snow showers. waves building to 5 to 8 feet occasionally to
10 feet.
.sunday...northeast winds 15 to 25 knots becoming northwest 5 to
15 knots. waves subsiding to calm to 2 feet.
.monday...south winds 5 to 15 knots becoming southwest 20 to
30 knots. waves building to 3 to 6 feet occasionally to 8 feet.
$$
(6/10)
Latest Great Lakes Marine Forecast by KMQT
Issued 3/18/2026 4:01 PM America/New_York.
Valid through 3/19/2026 4:00 AM America/New_York.
fzus63 kmqt 182001
glfls
expires:202603190800;;916012
open lake forecast for lake superior
national weather service marquette mi
400 pm edt wed mar 18 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...
a 29.8 inch clipper low over northern ontario lifts towards james
bay this evening. behind this low, weak ridging of around 30.1
inches returns over lake superior on thursday ahead of another
clipper low moving through the lake thursday night into early friday
at around 29.7 inches. while a subsequent low moves through northern
ontario towards james bay late friday/friday night, yet another low
stretches into the northern plains around the same time. together,
these lows are expected to bring about troughing of around around
29.7 inch over lake superior on saturday. behind the troughing, 30.4
inch ridging builds into the great lakes and northern plains to
begin next week.
lsz263-190800-
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 wed mar 18 2026
.late this afternoon...west winds 10 to 20 knots. waves 2 to
4 feet.
.tonight...west winds 5 to 15 knots veering north late. a slight
chance of snow showers through midnight. a slight chance of rain
showers. waves subsiding to calm to 2 feet.
.thursday...north winds 5 to 15 knots becoming south less than
10 knots in the afternoon, then increasing to 5 to 15 knots late.
a chance of rain and snow showers by mid afternoon. waves calm to
2 feet.
.thursday night...southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight, then becoming west 5 to 15 knots
late. a chance of rain and snow showers. waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.friday...northwest winds 5 to 15 knots backing west by mid
afternoon. waves calm to 2 feet.
.friday night...west winds 5 to 15 knots. waves calm to 2 feet.
.saturday...north winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. a chance of snow showers. waves
building to 3 to 5 feet occasionally to 7 feet.
.saturday night...northeast winds 20 to 30 knots. a chance of
snow showers. waves building to 7 to 10 feet occasionally to
13 feet.
.sunday...northeast 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.
.monday...southwest winds 10 to 20 knots increasing to gales to
35 knots. waves subsiding to 1 to 3 feet, then building to 6 to
9 feet occasionally to 11 feet.
$$
(7/10)
Latest Great Lakes Marine Forecast by KMQT
Issued 3/18/2026 4:01 PM America/New_York.
Valid through 3/19/2026 4:00 AM America/New_York.
fzus63 kmqt 182001
glfls
expires:202603190800;;916013
open lake forecast for lake superior
national weather service marquette mi
400 pm edt wed mar 18 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...
a 29.8 inch clipper low over northern ontario lifts towards james
bay this evening. behind this low, weak ridging of around 30.1
inches returns over lake superior on thursday ahead of another
clipper low moving through the lake thursday night into early friday
at around 29.7 inches. while a subsequent low moves through northern
ontario towards james bay late friday/friday night, yet another low
stretches into the northern plains around the same time. together,
these lows are expected to bring about troughing of around around
29.7 inch over lake superior on saturday. behind the troughing, 30.4
inch ridging builds into the great lakes and northern plains to
begin next week.
lsz264-190800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 pm edt wed mar 18 2026
.late this afternoon...southwest winds 10 to 20 knots. waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.tonight...west winds 5 to 15 knots veering north late. a slight
chance of snow showers through midnight. waves subsiding to calm
to 2 feet.
.thursday...north winds 5 to 15 knots becoming northwest less
than 10 knots in the afternoon, then becoming southwest 5 to
15 knots late. a chance of snow showers by mid afternoon. waves
calm to 2 feet.
.thursday night...south winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering southwest late. snow
showers, possibly mixed with rain and freezing rain likely
through midnight, then a chance of rain showers, possibly mixed
with snow after midnight. waves building to 2 to 4 feet.
.friday...north winds 5 to 15 knots backing west by mid
afternoon. waves subsiding to calm to 2 feet.
.friday night...west winds 10 to 20 knots. waves building to 1 to
3 feet.
.saturday...north winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. a chance of rain showers through early
afternoon. a chance of snow showers. waves building to 3 to
5 feet occasionally to 7 feet.
.saturday night...northeast winds 20 to 30 knots. a chance of
snow showers. freezing spray after midnight. waves building to
7 to 10 feet occasionally to 13 feet.
.sunday...northeast winds 20 to 30 knots becoming north 5 to
15 knots. freezing spray. waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.monday...southwest winds 5 to 15 knots increasing to gales to
35 knots. waves subsiding to 1 to 3 feet, then building to 8 to
11 feet occasionally to 14 feet.
$$
(8/10)
Latest Great Lakes Marine Forecast by KMQT
Issued 3/18/2026 4:01 PM America/New_York.
Valid through 3/19/2026 4:00 AM America/New_York.
fzus63 kmqt 182001
glfls
expires:202603190800;;916014
open lake forecast for lake superior
national weather service marquette mi
400 pm edt wed mar 18 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...
a 29.8 inch clipper low over northern ontario lifts towards james
bay this evening. behind this low, weak ridging of around 30.1
inches returns over lake superior on thursday ahead of another
clipper low moving through the lake thursday night into early friday
at around 29.7 inches. while a subsequent low moves through northern
ontario towards james bay late friday/friday night, yet another low
stretches into the northern plains around the same time. together,
these lows are expected to bring about troughing of around around
29.7 inch over lake superior on saturday. behind the troughing, 30.4
inch ridging builds into the great lakes and northern plains to
begin next week.
lsz265-190800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 pm edt wed mar 18 2026
.late this afternoon...southwest winds 10 to 20 knots. waves calm
to 2 feet.
.tonight...west winds 10 to 20 knots veering northwest after
midnight. a slight chance of snow showers. waves calm to 2 feet.
.thursday...north winds 5 to 15 knots backing northwest in the
afternoon, then backing south late. a chance of snow showers by
mid afternoon. waves calm to 2 feet.
.thursday night...southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight, then veering southwest late. a
chance of snow showers through midnight. a chance of rain
showers. waves building to 1 to 3 feet.
.friday...northwest winds 10 to 20 knots. waves subsiding to calm
to 2 feet.
.friday night...west winds 10 to 20 knots increasing to 15 to
25 knots after midnight. waves building to 1 to 3 feet.
.saturday...northwest winds 15 to 25 knots becoming northeast
20 to 30 knots by mid afternoon. a chance of snow showers. waves
building to 3 to 5 feet occasionally to 7 feet.
.saturday night...northeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. a chance of snow showers.
freezing spray after midnight. waves building to 9 to 12 feet
occasionally to 15 feet.
.sunday...northeast winds 20 to 30 knots becoming north 15 to
25 knots. freezing spray. waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.monday...northwest winds 15 to 25 knots becoming southwest gales
to 35 knots. waves subsiding to 1 to 3 feet, then building to
4 to 7 feet occasionally to 9 feet.
$$
(9/10)
Latest Great Lakes Marine Forecast by KMQT
Issued 3/18/2026 4:01 PM America/New_York.
Valid through 3/19/2026 4:00 AM America/New_York.
fzus63 kmqt 182001
glfls
expires:202603190800;;916015
open lake forecast for lake superior
national weather service marquette mi
400 pm edt wed mar 18 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...
a 29.8 inch clipper low over northern ontario lifts towards james
bay this evening. behind this low, weak ridging of around 30.1
inches returns over lake superior on thursday ahead of another
clipper low moving through the lake thursday night into early friday
at around 29.7 inches. while a subsequent low moves through northern
ontario towards james bay late friday/friday night, yet another low
stretches into the northern plains around the same time. together,
these lows are expected to bring about troughing of around around
29.7 inch over lake superior on saturday. behind the troughing, 30.4
inch ridging builds into the great lakes and northern plains to
begin next week.
lsz266-190800-
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 wed mar 18 2026
.late this afternoon...southwest winds 10 to 20 knots. waves 3 to
6 feet occasionally to 8 feet.
.tonight...west winds 10 to 20 knots veering northwest after
midnight. a slight chance of snow showers. waves subsiding to
1 to 3 feet.
.thursday...north winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon, then backing west late. a chance of
snow showers by mid afternoon. waves subsiding to calm to 2 feet.
.thursday night...south winds 5 to 15 knots increasing to 15 to
25 knots after midnight. a slight chance of rain showers through
midnight. snow showers likely. rain showers likely after
midnight. waves building to 2 to 4 feet.
.friday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. a slight chance of rain showers
through early afternoon. waves subsiding to 1 to 3 feet.
.friday night...west winds 15 to 25 knots increasing to 20 to
30 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet.
.saturday...northwest winds 20 to 30 knots veering north by mid
afternoon. a chance of snow showers, possibly mixed with rain.
waves building to 3 to 6 feet occasionally to 8 feet.
.saturday night...northeast gales to 40 knots. a chance of snow
showers. freezing spray after midnight. waves building to 9 to
12 feet occasionally to 15 feet.
.sunday...northeast winds 20 to 30 knots becoming north 15 to
25 knots. freezing spray. waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.monday...south winds 15 to 25 knots increasing to gales to
35 knots. freezing spray. waves subsiding to 2 to 4 feet, then
building to 9 to 12 feet occasionally to 15 feet.
$$
(10/10)
Latest Great Lakes Marine Forecast by KMQT
Issued 3/18/2026 4:01 PM America/New_York.
Valid through 3/19/2026 4:00 AM America/New_York.
fzus63 kmqt 182001
glfls
expires:202603190800;;916016
open lake forecast for lake superior
national weather service marquette mi
400 pm edt wed mar 18 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...
a 29.8 inch clipper low over northern ontario lifts towards james
bay this evening. behind this low, weak ridging of around 30.1
inches returns over lake superior on thursday ahead of another
clipper low moving through the lake thursday night into early friday
at around 29.7 inches. while a subsequent low moves through northern
ontario towards james bay late friday/friday night, yet another low
stretches into the northern plains around the same time. together,
these lows are expected to bring about troughing of around around
29.7 inch over lake superior on saturday. behind the troughing, 30.4
inch ridging builds into the great lakes and northern plains to
begin next week.
lsz267-190800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 pm edt wed mar 18 2026
.late this afternoon...southwest winds 15 to 25 knots. a chance
of snow showers. waves 3 to 5 feet occasionally to 7 feet
subsiding to 2 to 4 feet.
.tonight...southwest winds 15 to 25 knots becoming west 10 to
20 knots after midnight, then veering northwest late. a slight
chance of snow showers through midnight. waves subsiding to calm
to 2 feet.
.thursday...north winds 10 to 20 knots backing northwest in the
afternoon, then becoming west 5 to 15 knots late. waves calm to
2 feet.
.thursday night...south winds 5 to 15 knots increasing to 15 to
25 knots. a chance of snow showers through midnight, then snow
showers, possibly mixed with rain after midnight. waves building
to 2 to 4 feet.
.friday...southwest winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. a slight chance of rain showers,
possibly mixed with snow through early afternoon. waves subsiding
to 1 to 3 feet.
.friday night...west winds 10 to 20 knots increasing to 15 to
25 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet.
.saturday...northwest winds 20 to 30 knots becoming northeast
15 to 25 knots by mid afternoon. a chance of rain and snow
showers. waves building to 3 to 6 feet occasionally to 8 feet.
.saturday night...northeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. a chance of snow showers. waves
subsiding to 3 to 5 feet occasionally to 7 feet, then building to
6 to 9 feet occasionally to 11 feet.
.sunday...northeast winds 20 to 30 knots diminishing to 10 to
20 knots. waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.
.monday...southwest winds 10 to 20 knots becoming south gales to
35 knots. freezing spray. waves subsiding to 1 to 3 feet, then
building to 8 to 11 feet occasionally to 14 feet.
$$
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