fzus63 kdtx 121938
glflh 
expires:202605130345;;452001

open lake forecast for lake huron
national weather service detroit/pontiac mi
338 pm edt tue may 12 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...low pressure of 29.70 inches will track west to east
across the northern great lakes through wednesday. this system
will bring increasing south winds this afternoon and evening,
followed by gusty west and northwest winds for wednesday. showers
and a few thunderstorms accompany the arrival of this system this
evening and into the overnight hours.


lhz361-362-130345-
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-
338 pm edt tue may 12 2026

.tonight...east winds 20 to 25 knots with gusts to around
30 knots decreasing to 10 to 15 knots early in the morning. a
chance of showers. waves 8 to 12 feet. waves occasionally around
15 feet. 
.wednesday...north winds 10 to 15 knots becoming west 15 to
20 knots late in the morning...then becoming northwest 20 to
25 knots with gusts to around 30 knots in the afternoon. a chance
of showers in the morning...then showers likely in the afternoon.
waves 5 to 7 feet. waves occasionally around 10 feet. 
.wednesday night...northwest winds 15 to 20 knots. a chance of
showers in the evening. waves 5 to 7 feet. waves occasionally
around 10 feet. 
.thursday...northwest winds 15 to 20 knots decreasing to 10 to
15 knots in the late morning and afternoon. waves 3 to 5 feet. 
.thursday night...west winds 5 to 10 knots  becoming light and
variable. waves 2 to 4 feet subsiding to 2 feet or less in the
late evening and overnight. 
.friday...south winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers late in the evening. waves 1 to
3 feet building to 4 to 6 feet. waves occasionally around 8 feet.
.saturday...southwest winds 15 to 20 knots veering to the west
early in the evening...then becoming northwest 10 to 15 knots by
midnight. a chance of showers early in the morning. waves 4 to
6 feet. 
.sunday...northwest winds 5 to 10 knots veering to the northeast
in the late morning and early afternoon...then becoming east
10 to 15 knots early in the evening increasing to 15 to 20 knots
by midnight. a chance of showers . waves 2 to 4 feet building to
4 to 6 feet . waves occasionally around 8 feet. 


$$

fzus63 kdtx 121938
glflh 
expires:202605130345;;452002

open lake forecast for lake huron
national weather service detroit/pontiac mi
338 pm edt tue may 12 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...low pressure of 29.70 inches will track west to east
across the northern great lakes through wednesday. this system
will bring increasing south winds this afternoon and evening,
followed by gusty west and northwest winds for wednesday. showers
and a few thunderstorms accompany the arrival of this system this
evening and into the overnight hours.


lhz363-462>464-130345-
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-
338 pm edt tue may 12 2026

.tonight...southeast winds 15 to 20 knots increasing to 20 to
25 knots with gusts to around 30 knots late in the evening...then
becoming south 15 to 20 knots after midnight. showers likely in
the evening. waves 5 to 7 feet. waves occasionally around
10 feet. 
.wednesday...southwest winds 10 to 15 knots becoming west 15 to
20 knots with gusts to around 30 knots in the late morning and
afternoon. a chance of showers in the afternoon. waves 4 to
6 feet building to 6 to 9 feet late in the afternoon. waves
occasionally around 12 feet. 
.wednesday night...northwest winds 20 to 25 knots with gusts to
around 30 knots decreasing to 15 to 20 knots with gusts to around
30 knots in the late evening and overnight. waves 6 to 9 feet.
waves occasionally around 12 feet. 
.thursday...northwest winds 15 to 20 knots. waves 5 to 7 feet.
waves occasionally around 10 feet. 
.thursday night...north winds 5 to 10 knots early in the evening
becoming light and variable. waves 3 to 5 feet subsiding to 1 to
3 feet in the late evening and overnight. 
.friday...southwest winds 5 to 10 knots becoming south 15 to
20 knots. waves 1 to 3 feet building to 3 to 5 feet late in the
afternoon. 
.saturday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. waves 3 to 5 feet. 
.sunday...north winds 5 to 10 knots veering to the east early in
the evening...then increasing to 10 to 15 knots by midnight. a
chance of showers and thunderstorms . waves 2 to 4 feet subsiding
to 1 to 3 feet until early evening...then building to 2 to 4 feet
by midnight. 


$$

fzus63 kmkx 121937
glflm 
expires:202605130315;;451964

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
237 pm cdt tue may 12 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...

low pressure of 29.7 inches over northern wisconsin early this
afternoon will reach northern lake michigan early this evening 
and lake huron by early wednesday morning. an associated cold 
front will approach the lake today, moving through this evening.
gusty south to southwest winds will continue today as the front
approaches, with a few gales possible across central and 
northern portions of the lake through late afternoon. showers 
and a few storms will be possible ahead of and along the front 
today. 

gusty west to northwest winds will arrive behind the cold front 
tonight into wednesday. gusts could approach gale force for a time
tonight into early wednesday, but are expected to mainly stay 
below gales. lighter northerly winds are then likely thursday as 
high pressure of 30.2 inches moves overhead. breezy southerly 
winds are expected to develop friday ahead of the next approaching
low pressure system. 


lmz261-362-130315-
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-
237 pm cdt tue may 12 2026

rock island passage to charlevoix mi north...

.tonight...southeast winds 15 to 25 kt backing to northwest to
30 kt. rain showers and slight chance of thunderstorms this
evening, then chance of rain showers overnight. waves 5 to 8 ft
occasionally to 10 ft subsiding to 4 to 6 ft occasionally to
8 ft. 
.wednesday...northwest winds to 30 kt. slight chance of rain
showers in the morning. waves 4 to 6 ft occasionally to 8 ft
subsiding to 3 to 5 ft. 
.wednesday night...northwest winds 15 to 25 kt becoming north
10 to 20 kt. waves 2 to 4 ft subsiding to 1 to 3 ft. 
.thursday...north winds 10 to 15 kt backing to southwest. waves
1 to 2 ft. 
.thursday night...southwest winds 5 to 10 kt becoming south 10 to
20 kt overnight. waves 1 to 2 ft building to 1 to 3 ft. 
.friday...south winds to 30 kt. chance of rain showers. waves
4 to 6 ft occasionally to 8 ft building to 6 to 9 ft occasionally
to 12 ft. 
.friday night...south winds to 30 kt becoming southwest. waves
7 to 10 ft occasionally to 13 ft. 
.saturday...southwest winds 15 to 25 kt becoming west. waves 4 to
6 ft occasionally to 8 ft subsiding to 3 to 5 ft. 
.sunday...east winds 10 to 15 kt increasing to 10 to 20 kt.
chance of rain showers. waves 1 to 2 ft building to 1 to 3 ft.  

$$

fzus63 kmkx 121937
glflm 
expires:202605130315;;451965

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
237 pm cdt tue may 12 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...

low pressure of 29.7 inches over northern wisconsin early this
afternoon will reach northern lake michigan early this evening 
and lake huron by early wednesday morning. an associated cold 
front will approach the lake today, moving through this evening.
gusty south to southwest winds will continue today as the front
approaches, with a few gales possible across central and 
northern portions of the lake through late afternoon. showers 
and a few storms will be possible ahead of and along the front 
today. 

gusty west to northwest winds will arrive behind the cold front 
tonight into wednesday. gusts could approach gale force for a time
tonight into early wednesday, but are expected to mainly stay 
below gales. lighter northerly winds are then likely thursday as 
high pressure of 30.2 inches moves overhead. breezy southerly 
winds are expected to develop friday ahead of the next approaching
low pressure system. 


lmz364-366-563-565-567-868-130315-
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-
237 pm cdt tue may 12 2026

rock island passage to charlevoix mi south to sheboygan wi to
pentwater mi...

...gale warning in effect until 5 pm cdt this afternoon...

.tonight...south winds to 30 kt veering to northwest. chance of
rain showers and slight chance of thunderstorms this evening,
then slight chance of rain showers overnight. waves 6 to 9 ft
occasionally to 12 ft subsiding to 4 to 7 ft occasionally to
9 ft. 
.wednesday...northwest winds to 30 kt becoming north. waves 5 to
8 ft occasionally to 10 ft subsiding to 4 to 6 ft occasionally to
8 ft. 
.wednesday night...north winds to 30 kt diminishing to 10 to
20 kt. waves 2 to 4 ft subsiding to 1 to 3 ft. 
.thursday...north winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 2 ft. 
.thursday night...south winds 5 to 10 kt increasing to 10 to
20 kt overnight. waves 1 to 2 ft building to 2 to 4 ft. 
.friday...south winds to 30 kt. chance of rain showers. waves
5 to 8 ft occasionally to 10 ft building to 7 to 10 ft
occasionally to 13 ft. 
.friday night...south winds to 30 kt becoming southwest. waves
7 to 10 ft occasionally to 13 ft. 
.saturday...southwest winds 15 to 25 kt. waves 4 to 6 ft
occasionally to 8 ft subsiding to 2 to 4 ft. 
.sunday...east winds 10 to 20 kt. chance of rain showers and
thunderstorms. waves 2 to 4 ft building to 3 to 5 ft.  

$$

fzus63 kmkx 121937
glflm 
expires:202605130315;;451966

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
237 pm cdt tue may 12 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...

low pressure of 29.7 inches over northern wisconsin early this
afternoon will reach northern lake michigan early this evening 
and lake huron by early wednesday morning. an associated cold 
front will approach the lake today, moving through this evening.
gusty south to southwest winds will continue today as the front
approaches, with a few gales possible across central and 
northern portions of the lake through late afternoon. showers 
and a few storms will be possible ahead of and along the front 
today. 

gusty west to northwest winds will arrive behind the cold front 
tonight into wednesday. gusts could approach gale force for a time
tonight into early wednesday, but are expected to mainly stay 
below gales. lighter northerly winds are then likely thursday as 
high pressure of 30.2 inches moves overhead. breezy southerly 
winds are expected to develop friday ahead of the next approaching
low pressure system. 


lmz669-671-870-872-130315-
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-
237 pm cdt tue may 12 2026

sheboygan wi to pentwater mi south to north point light wi to
grand haven mi...

...gale warning in effect until 5 pm cdt this afternoon...

.tonight...southwest winds to 30 kt veering to northwest. chance
of rain showers and thunderstorms this evening. waves 4 to 7 ft
occasionally to 9 ft subsiding to 4 to 6 ft occasionally to 8 ft.
.wednesday...northwest winds to 30 kt becoming north. waves 5 to
8 ft occasionally to 10 ft subsiding to 4 to 6 ft occasionally to
8 ft. 
.wednesday night...north winds to 30 kt becoming northwest 10 to
20 kt. waves 3 to 5 ft subsiding to 2 to 4 ft. 
.thursday...north winds 10 to 20 kt. waves 1 to 3 ft. 
.thursday night...southeast winds 10 to 15 kt becoming south
10 to 20 kt. waves 1 to 2 ft building to 2 to 4 ft. 
.friday...south winds to 30 kt. chance of rain showers. waves
6 to 9 ft occasionally to 12 ft. 
.friday night...south winds 15 to 25 kt becoming southwest 10 to
20 kt. waves 6 to 9 ft occasionally to 12 ft subsiding to 4 to
7 ft occasionally to 9 ft. 
.saturday...southwest winds 10 to 20 kt. waves 3 to 5 ft
subsiding to 2 to 4 ft. 
.sunday...east winds 10 to 20 kt becoming southeast. chance of
rain showers. waves 3 to 5 ft.  

$$

fzus63 kmqt 121402
glfls 
expires:202605122000;;438094

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue may 12 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 29.7 inch clipper low near duluth this morning will move across 
upper michigan through this evening. as the clipper departs eastward 
early wednesday, ridging moves back over lake superior and builds to 
30.1 inches wednesday night into thursday. this ridging is pressed 
southeast to the lower great lakes late thursday into friday while a 
29.1 inch low emanates off the canadian rockies. this low is 
expected to bring troughing of 29.6 inches over lake superior friday 
into friday night as it tracks to near james bay at 29.3 inches by 
saturday morning. ridging of 30.1 inches builds over the lake from 
northern ontario saturday night into sunday, followed by another 
29.7 inch trough extending from the central plains early next week.



lsz162-122000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt tue may 12 2026 /901 am cdt tue may 12 2026/

.rest of today...east winds 10 to 20 knots backing north late. a
chance of rain showers. waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.tonight...north winds 15 to 25 knots becoming northwest 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
a slight chance of rain showers. waves subsiding to calm to
2 feet. 
.wednesday...northwest winds 5 to 15 knots backing west in the
afternoon. waves calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots veering east after
midnight. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves calm to 2 feet. 
.thursday night...east winds 10 to 20 knots becoming south 20 to
30 knots after midnight. rain showers likely. waves building to
3 to 5 feet occasionally to 7 feet. 
.friday...southwest winds 15 to 25 knots veering west. waves
subsiding to 2 to 4 feet. 
.saturday...west winds 15 to 25 knots becoming northeast 10 to
20 knots. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 121402
glfls 
expires:202605122000;;438099

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue may 12 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 29.7 inch clipper low near duluth this morning will move across 
upper michigan through this evening. as the clipper departs eastward 
early wednesday, ridging moves back over lake superior and builds to 
30.1 inches wednesday night into thursday. this ridging is pressed 
southeast to the lower great lakes late thursday into friday while a 
29.1 inch low emanates off the canadian rockies. this low is 
expected to bring troughing of 29.6 inches over lake superior friday 
into friday night as it tracks to near james bay at 29.3 inches by 
saturday morning. ridging of 30.1 inches builds over the lake from 
northern ontario saturday night into sunday, followed by another 
29.7 inch trough extending from the central plains early next week.



lsz267-122000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1001 am edt tue may 12 2026

.rest of today...southeast winds 15 to 25 knots increasing to
20 to 30 knots in the afternoon. rain showers. waves 2 to 4 feet
building to 3 to 6 feet occasionally to 8 feet. 
.tonight...southeast winds 20 to 30 knots becoming northeast
15 to 25 knots after midnight, then backing north late. rain
showers likely. waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 2 to 4 feet. 
.wednesday...north winds 20 to 30 knots backing northwest in the
afternoon. a slight chance of rain showers through early
afternoon. waves 3 to 6 feet occasionally to 8 feet. 
.wednesday night...north winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 1 to 3 feet. 
.thursday...north winds 5 to 15 knots backing northwest by mid
afternoon. waves subsiding to calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots becoming south
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.friday...south winds 20 to 30 knots. a chance of rain showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.saturday...west gales to 35 knots becoming northwest 10 to
20 knots. waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 2 to 4 feet. 

$$

fzus63 kmqt 121402
glfls 
expires:202605122000;;438095

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue may 12 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 29.7 inch clipper low near duluth this morning will move across 
upper michigan through this evening. as the clipper departs eastward 
early wednesday, ridging moves back over lake superior and builds to 
30.1 inches wednesday night into thursday. this ridging is pressed 
southeast to the lower great lakes late thursday into friday while a 
29.1 inch low emanates off the canadian rockies. this low is 
expected to bring troughing of 29.6 inches over lake superior friday 
into friday night as it tracks to near james bay at 29.3 inches by 
saturday morning. ridging of 30.1 inches builds over the lake from 
northern ontario saturday night into sunday, followed by another 
29.7 inch trough extending from the central plains early next week.



lsz263-122000-
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 am edt tue may 12 2026

.rest of today...southeast winds 10 to 20 knots increasing to
15 to 25 knots in the afternoon, then backing north late. rain
showers by late morning, then a chance of rain showers by mid
afternoon. waves 2 to 4 feet building to 4 to 7 feet occasionally
to 9 feet. 
.tonight...north winds 15 to 25 knots becoming northwest 10 to
20 knots late. a slight chance of rain showers through midnight.
waves subsiding to 2 to 4 feet. 
.wednesday...northwest winds 5 to 15 knots backing west late.
waves subsiding to calm to 2 feet. 
.wednesday night...northwest winds 5 to 15 knots becoming
southeast less than 10 knots after midnight. waves calm to
2 feet. 
.thursday...east winds less than 10 knots increasing to 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 15 to 25 knots becoming south
20 to 30 knots after midnight. rain showers likely after
midnight. waves building to 3 to 6 feet occasionally to 8 feet. 
.friday...south winds 15 to 25 knots becoming west 20 to
30 knots. waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.saturday...west gales to 35 knots becoming east 10 to 20 knots.
waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 121402
glfls 
expires:202605122000;;438096

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue may 12 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 29.7 inch clipper low near duluth this morning will move across 
upper michigan through this evening. as the clipper departs eastward 
early wednesday, ridging moves back over lake superior and builds to 
30.1 inches wednesday night into thursday. this ridging is pressed 
southeast to the lower great lakes late thursday into friday while a 
29.1 inch low emanates off the canadian rockies. this low is 
expected to bring troughing of 29.6 inches over lake superior friday 
into friday night as it tracks to near james bay at 29.3 inches by 
saturday morning. ridging of 30.1 inches builds over the lake from 
northern ontario saturday night into sunday, followed by another 
29.7 inch trough extending from the central plains early next week.



lsz264-122000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1001 am edt tue may 12 2026

...gale warning in effect until 6 pm edt this evening...

.rest of today...southeast winds 20 to 30 knots increasing to
gales to 35 knots in the afternoon, then diminishing to 20 to
30 knots late. rain showers. a slight chance of snow showers by
mid afternoon. waves 3 to 6 feet occasionally to 8 feet building
to 5 to 8 feet occasionally to 10 feet. 
.tonight...northeast winds 15 to 25 knots backing north after
midnight. a slight chance of snow showers through midnight. a
chance of rain showers. waves subsiding to 3 to 5 feet
occasionally to 7 feet. 
.wednesday...northwest winds 10 to 20 knots. waves subsiding to
1 to 3 feet. 
.wednesday night...northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.thursday...east winds less than 10 knots becoming southeast
10 to 20 knots by mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 15 to 25 knots becoming south
20 to 30 knots after midnight. a chance of rain showers after
midnight. waves building to 3 to 6 feet occasionally to 8 feet. 
.friday...south winds 20 to 30 knots veering southwest. a chance
of rain showers. waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet. 
.saturday...west gales to 35 knots becoming northeast 5 to
15 knots. waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 121402
glfls 
expires:202605122000;;438097

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue may 12 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 29.7 inch clipper low near duluth this morning will move across 
upper michigan through this evening. as the clipper departs eastward 
early wednesday, ridging moves back over lake superior and builds to 
30.1 inches wednesday night into thursday. this ridging is pressed 
southeast to the lower great lakes late thursday into friday while a 
29.1 inch low emanates off the canadian rockies. this low is 
expected to bring troughing of 29.6 inches over lake superior friday 
into friday night as it tracks to near james bay at 29.3 inches by 
saturday morning. ridging of 30.1 inches builds over the lake from 
northern ontario saturday night into sunday, followed by another 
29.7 inch trough extending from the central plains early next week.



lsz265-122000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1001 am edt tue may 12 2026

...gale warning in effect until 6 pm edt this evening...
...gale watch in effect from wednesday morning through wednesday
afternoon...

.rest of today...southeast winds 20 to 30 knots increasing to
gales to 35 knots in the afternoon, then diminishing to 20 to
30 knots late. rain showers. waves 4 to 8 feet occasionally to
10 feet, then subsiding to 4 to 7 feet occasionally to 9 feet. 
.tonight...north winds 15 to 25 knots increasing to 20 to
30 knots after midnight. a chance of rain showers. waves
subsiding to 3 to 5 feet occasionally to 7 feet, then building to
5 to 8 feet occasionally to 10 feet. 
.wednesday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. waves subsiding to 3 to 5 feet occasionally to
7 feet. 
.wednesday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.thursday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves building to 1 to 3 feet. 
.thursday night...southeast winds 20 to 30 knots veering south
after midnight. a chance of rain showers after midnight. waves
building to 3 to 6 feet occasionally to 8 feet. 
.friday...south winds 20 to 30 knots veering west. a chance of
rain showers. waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet. 
.saturday...west gales to 35 knots becoming east 10 to 20 knots.
waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 121402
glfls 
expires:202605122000;;438098

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue may 12 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 29.7 inch clipper low near duluth this morning will move across 
upper michigan through this evening. as the clipper departs eastward 
early wednesday, ridging moves back over lake superior and builds to 
30.1 inches wednesday night into thursday. this ridging is pressed 
southeast to the lower great lakes late thursday into friday while a 
29.1 inch low emanates off the canadian rockies. this low is 
expected to bring troughing of 29.6 inches over lake superior friday 
into friday night as it tracks to near james bay at 29.3 inches by 
saturday morning. ridging of 30.1 inches builds over the lake from 
northern ontario saturday night into sunday, followed by another 
29.7 inch trough extending from the central plains early next week.



lsz266-122000-
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 am edt tue may 12 2026

...gale warning in effect until 6 pm edt this evening...
...gale watch in effect from wednesday morning through wednesday
afternoon...

.rest of today...south winds 20 to 30 knots becoming southeast
gales to 35 knots in the afternoon, then diminishing to 20 to
30 knots late. rain showers. waves 4 to 8 feet occasionally to
10 feet. 
.tonight...east winds 20 to 30 knots backing north after
midnight. rain showers likely through midnight, then a chance of
rain showers after midnight. waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 5 to 8 feet occasionally
to 10 feet. 
.wednesday...north winds 20 to 30 knots backing northwest in the
afternoon. a slight chance of rain showers through early
afternoon. waves subsiding to 3 to 6 feet occasionally to 8 feet.
.wednesday night...northwest winds 15 to 25 knots becoming north
5 to 15 knots after midnight. waves subsiding to 1 to 3 feet. 
.thursday...north winds less than 10 knots becoming southeast
10 to 20 knots by mid afternoon. waves subsiding to calm to
2 feet. 
.thursday night...southeast winds 15 to 25 knots becoming south
gales to 35 knots after midnight. a chance of rain showers after
midnight. waves building to 4 to 7 feet occasionally to 9 feet. 
.friday...south gales to 40 knots. a chance of rain showers.
waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 
.saturday...west gales to 35 knots becoming northwest 10 to
20 knots. waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to 1 to 3 feet. 

$$