fzus63 kdtx 041338
glflh 
expires:202605042145;;000862

open lake forecast for lake huron
national weather service detroit/pontiac mi
938 am edt mon may 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...southwest winds continue through today with localized
elevated winds found within the saginaw bay. a cold front moves
through tonight into tomorrow morning which veers wind direction
from southwest to northwest.


lhz361-042145-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
938 am edt mon may 4 2026

.rest of today...southeast winds 10 to 15 knots becoming south
15 to 20 knots in the afternoon. a chance of showers in the
afternoon. waves 3 to 5 feet. 
.tonight...southwest winds 15 to 20 knots becoming northwest
10 to 15 knots by midnight...then backing to the west early in
the morning. a chance of showers in the evening. waves 3 to
5 feet subsiding to 1 to 3 feet early in the morning. 
.tuesday...west winds 10 to 15 knots increasing to 15 to 20 knots
in the late morning and afternoon. waves 2 to 4 feet. 
.tuesday night...west winds 10 to 15 knots becoming northwest
5 to 10 knots in the late evening and overnight. waves 2 to
4 feet subsiding to 1 to 3 feet in the late evening and
overnight. 
.wednesday...west winds 5 to 10 knots increasing to 10 to
15 knots late in the morning...then becoming northwest 5 to
10 knots late in the evening. waves 1 to 3 feet. 
.thursday...west winds 5 to 10 knots. waves 2 feet or less. 
.friday...west winds 5 to 10 knots increasing to 10 to 15 knots
early in the evening...then decreasing to 5 to 10 knots by
midnight. waves 1 to 3 feet. 


$$

fzus63 kdtx 041338
glflh 
expires:202605042145;;000863

open lake forecast for lake huron
national weather service detroit/pontiac mi
938 am edt mon may 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...southwest winds continue through today with localized
elevated winds found within the saginaw bay. a cold front moves
through tonight into tomorrow morning which veers wind direction
from southwest to northwest.


lhz362-363-042145-
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-
938 am edt mon may 4 2026

.rest of today...south winds 15 to 20 knots. waves 2 to 4 feet
building to 5 to 7 feet in the afternoon. waves occasionally
around 10 feet. 
.tonight...south winds 15 to 20 knots becoming southwest 10 to
15 knots by midnight...then becoming 5 to 10 knots early in the
morning. a chance of showers in the evening. waves 4 to 6 feet.
waves occasionally around 8 feet. 
.tuesday...north winds 5 to 10 knots backing to the southwest in
the late morning and early afternoon...then veering to the
southwest 5 to 10 knots early in the afternoon. waves 2 to
4 feet. 
.tuesday night...north winds 5 to 10 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet in the late evening and overnight. 
.wednesday...north winds 5 to 10 knots. waves 1 to 3 feet. 
.thursday...north winds 5 to 10 knots veering to the east early
in the evening...then veering to the south by midnight. waves
2 feet or less. 
.friday...west winds 5 to 10 knots backing to the southeast early
in the evening...then backing to the northeast by midnight. waves
1 to 3 feet. 


$$

fzus63 kdtx 041338
glflh 
expires:202605042145;;000864

open lake forecast for lake huron
national weather service detroit/pontiac mi
938 am edt mon may 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...southwest winds continue through today with localized
elevated winds found within the saginaw bay. a cold front moves
through tonight into tomorrow morning which veers wind direction
from southwest to northwest.


lhz462>464-042145-
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-
938 am edt mon may 4 2026

.rest of today...south winds 10 to 15 knots increasing to 15 to
20 knots late in the afternoon. waves 1 to 3 feet building to
3 to 5 feet in the afternoon. 
.tonight...south winds 15 to 20 knots becoming southwest 10 to
15 knots after midnight. a chance of showers after midnight.
waves 2 to 4 feet. 
.tuesday...north winds 5 to 10 knots backing to the northwest in
the late morning and early afternoon...then backing to the south
early in the afternoon. waves 1 to 3 feet. 
.tuesday night...east winds 5 to 10 knots backing to the
northeast in the late evening and overnight. waves 2 feet or
less. 
.wednesday...north winds 5 to 10 knots becoming light and
variable. waves 2 feet or less. 
.thursday...north winds 5 to 10 knots early in the morning
becoming light and variable...then becoming west 5 to 10 knots by
midnight. waves 2 feet or less. 
.friday...west winds 5 to 10 knots backing to the southeast early
in the evening...then backing to the southeast 5 to 10 knots by
midnight. waves 2 feet or less. 


$$

fzus63 kmkx 041353
glflm 
expires:202605042115;;001334

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
853 am cdt mon may 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...

no major changes to the going forecast this morning.

winds return to a southerly direction and become gusty again 
around dawn on this morning. winds will further increase this 
morning ahead of another cold front in association with low 
pressure of 29.0 inches moving across ontario. a short 6 hour 
period of gales is possible over the northern third of lake 
michigan between 10am and 4pm cdt. less certainty in gales given
the colder waters of the lake potentially inhibiting higher gusts
from mixing down. winds then ease through the afternoon from 
north to south over the lake as the cold front moves south. winds 
behind the front will become northwesterly.

the pressure gradient will then ease over the lake tuesday
through thursday, with light and persistent west to northwest 
winds occuring. light and variable winds may briefly occur at times 
as various weak surface ridges move across the lake.


lmz261-362-364-563-042115-
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 rock island passage to sturgeon bay wi-
853 am cdt mon may 4 2026

sturgeon bay wi to point betsie mi north...

...gale warning in effect until 4 pm cdt this afternoon...

.rest of today...south winds to 30 kt becoming southwest gales to
35 kt. slight chance of rain showers this afternoon. waves 3 to
5 ft building to 5 to 8 ft occasionally to 10 ft. 
.tonight...west winds 15 to 25 kt diminishing to 10 to 20 kt.
slight chance of rain showers in the evening. waves 4 to 7 ft
occasionally to 9 ft subsiding to 2 to 4 ft. 
.tuesday...west winds 10 to 20 kt becoming southwest 10 to 15 kt.
waves 1 to 3 ft. 
.tuesday night...north winds 10 to 15 kt diminishing to 5 to
10 kt. waves 1 to 2 ft. 
.wednesday...west winds 10 to 15 kt becoming southwest 10 to
20 kt. waves 1 to 2 ft. 
.wednesday night...west winds 10 to 15 kt becoming southwest less
than 10 kt. waves 1 to 2 ft. 
.thursday...southwest winds 10 to 15 kt. waves 1 ft or less.
.friday...northwest winds 10 to 15 kt becoming southwest 10 to
20 kt. waves 1 to 2 ft.  

$$

fzus63 kmkx 041353
glflm 
expires:202605042115;;001335

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
853 am cdt mon may 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...

no major changes to the going forecast this morning.

winds return to a southerly direction and become gusty again 
around dawn on this morning. winds will further increase this 
morning ahead of another cold front in association with low 
pressure of 29.0 inches moving across ontario. a short 6 hour 
period of gales is possible over the northern third of lake 
michigan between 10am and 4pm cdt. less certainty in gales given
the colder waters of the lake potentially inhibiting higher gusts
from mixing down. winds then ease through the afternoon from 
north to south over the lake as the cold front moves south. winds 
behind the front will become northwesterly.

the pressure gradient will then ease over the lake tuesday
through thursday, with light and persistent west to northwest 
winds occuring. light and variable winds may briefly occur at times 
as various weak surface ridges move across the lake.


lmz366-565-567-868-042115-
lake michigan from point betsie to manistee mi 5 nm offshore to
mid lake-
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-
853 am cdt mon may 4 2026

sturgeon bay wi to point betsie mi south to sheboygan wi to
pentwater mi...

.rest of today...south winds 10 to 20 kt becoming southwest to
30 kt. chance of rain showers and slight chance of thunderstorms
this afternoon. waves 2 to 4 ft building to 4 to 7 ft
occasionally to 9 ft. 
.tonight...west winds 10 to 20 kt becoming northwest 10 to 15 kt.
slight chance of rain showers and thunderstorms in the evening,
then chance of rain showers overnight. waves 4 to 7 ft
occasionally to 9 ft subsiding to 2 to 4 ft. 
.tuesday...northwest winds 10 to 15 kt backing to southwest.
waves 1 to 3 ft. 
.tuesday night...west winds 5 to 10 kt veering to north 10 to
15 kt. waves 1 to 2 ft. 
.wednesday...northwest winds 10 to 15 kt backing to southwest.
waves 1 to 2 ft. 
.wednesday night...southwest winds 5 to 10 kt becoming west.
waves 1 ft or less. 
.thursday...west winds 5 to 10 kt becoming southwest 10 to 15 kt.
waves 1 ft or less. 
.friday...northwest winds 5 to 10 kt backing to south. waves 1 to
2 ft.  

$$

fzus63 kmkx 041353
glflm 
expires:202605042115;;001336

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
853 am cdt mon may 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...

no major changes to the going forecast this morning.

winds return to a southerly direction and become gusty again 
around dawn on this morning. winds will further increase this 
morning ahead of another cold front in association with low 
pressure of 29.0 inches moving across ontario. a short 6 hour 
period of gales is possible over the northern third of lake 
michigan between 10am and 4pm cdt. less certainty in gales given
the colder waters of the lake potentially inhibiting higher gusts
from mixing down. winds then ease through the afternoon from 
north to south over the lake as the cold front moves south. winds 
behind the front will become northwesterly.

the pressure gradient will then ease over the lake tuesday
through thursday, with light and persistent west to northwest 
winds occuring. light and variable winds may briefly occur at times 
as various weak surface ridges move across the lake.


lmz080-669-671-673-675-777-779-870-872-874-876-878-042115-
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-
853 am cdt mon may 4 2026

sheboygan wi to pentwater mi south...

.rest of today...southwest winds 10 to 20 kt becoming south to
30 kt, then diminishing to 15 to 25 kt late. waves 2 to 4 ft
building to 4 to 7 ft occasionally to 9 ft. 
.tonight...southwest winds 10 to 20 kt veering to northwest 10 to
15 kt. chance of rain showers and slight chance of thunderstorms
in the evening, then chance of rain showers overnight. waves 4 to
6 ft occasionally to 8 ft subsiding to 2 to 4 ft. 
.tuesday...northwest winds 10 to 15 kt veering to east. waves
1 to 3 ft. 
.tuesday night...southwest winds 5 to 10 kt becoming northwest
10 to 15 kt. waves 1 to 2 ft. 
.wednesday...northwest winds 10 to 15 kt becoming north. waves
1 to 2 ft. 
.wednesday night...south winds 5 to 10 kt becoming west. waves
1 to 2 ft. 
.thursday...west winds 10 to 15 kt becoming southwest. waves 1 to
2 ft. 
.friday...west winds 10 to 15 kt becoming north. waves 1 to 2 ft.
 

$$

fzus63 kmqt 041401
glfls 
expires:202605042000;;001548

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon may 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...

a 29.0 inch low over northwest ontario this morning is sending a 
29.2 inch trough across lake superior today. the low lifts near 
james bay at 29.2 inches by tuesday morning as 30.2 inch ridging 
builds east of the canadian rockies. the low continues lifting into 
far northern quebec through wednesday as high pressure over the 
canadian prairie splits and moves to the canadian four corners and 
the southern plains at 30.0 inches and 30.2 inches respectively. by 
thursday afternoon, lake superior will be between a 29.5 inch low 
over hudson bay, a 29.4 inch low over the mouth of the st lawrence 
river, a low of 29.7 inches over the black hills, a high of 30.1 
inches over oklahoma, and a weak 29.9 inch high over the 
saskatchewan/manitoba line. the hudson bay and black hills lows will 
work to pass a 29.8 inch trough over lake superior thursday night 
into friday, with the lows consolidating over quebec and the 
canadian maritimes by saturday morning, leaving remnant 29.8 inch 
troughing over lake superior.



lsz162-042000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt mon may 4 2026 /901 am cdt mon may 4 2026/

.rest of today...west winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible in the
afternoon, then diminishing to 20 to 30 knots late. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...west winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. waves subsiding to 1 to 3 feet. 
.tuesday...west winds 15 to 25 knots diminishing to 10 to
20 knots late. waves 1 to 3 feet. 
.tuesday night...northwest winds 10 to 20 knots backing west
after midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...west winds 5 to 15 knots veering northwest
after midnight. waves calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots veering northwest.
waves calm to 2 feet. 
.friday...southwest winds 5 to 15 knots veering northwest. waves
calm to 2 feet. 

$$

fzus63 kmqt 041401
glfls 
expires:202605042000;;001549

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon may 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...

a 29.0 inch low over northwest ontario this morning is sending a 
29.2 inch trough across lake superior today. the low lifts near 
james bay at 29.2 inches by tuesday morning as 30.2 inch ridging 
builds east of the canadian rockies. the low continues lifting into 
far northern quebec through wednesday as high pressure over the 
canadian prairie splits and moves to the canadian four corners and 
the southern plains at 30.0 inches and 30.2 inches respectively. by 
thursday afternoon, lake superior will be between a 29.5 inch low 
over hudson bay, a 29.4 inch low over the mouth of the st lawrence 
river, a low of 29.7 inches over the black hills, a high of 30.1 
inches over oklahoma, and a weak 29.9 inch high over the 
saskatchewan/manitoba line. the hudson bay and black hills lows will 
work to pass a 29.8 inch trough over lake superior thursday night 
into friday, with the lows consolidating over quebec and the 
canadian maritimes by saturday morning, leaving remnant 29.8 inch 
troughing over lake superior.



lsz263-042000-
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 mon may 4 2026

.rest of today...west winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible in the
afternoon, then diminishing to 20 to 30 knots late. a slight
chance of rain showers by late morning. waves 4 to 7 feet
occasionally to 9 feet building to 6 to 9 feet occasionally to
11 feet, then subsiding to 5 to 8 feet occasionally to 10 feet. 
.tonight...west winds 20 to 30 knots diminishing to 15 to
25 knots late. waves subsiding to 3 to 5 feet occasionally to
7 feet. 
.tuesday...west winds 10 to 20 knots. waves 3 to 5 feet
occasionally to 7 feet. 
.tuesday night...west winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots. waves building to 1 to
3 feet. 
.wednesday night...west winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.thursday...west winds 5 to 15 knots backing southwest. waves
calm to 2 feet. 
.friday...southwest winds 5 to 15 knots veering northwest. waves
calm to 2 feet. 

$$

fzus63 kmqt 041401
glfls 
expires:202605042000;;001550

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon may 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...

a 29.0 inch low over northwest ontario this morning is sending a 
29.2 inch trough across lake superior today. the low lifts near 
james bay at 29.2 inches by tuesday morning as 30.2 inch ridging 
builds east of the canadian rockies. the low continues lifting into 
far northern quebec through wednesday as high pressure over the 
canadian prairie splits and moves to the canadian four corners and 
the southern plains at 30.0 inches and 30.2 inches respectively. by 
thursday afternoon, lake superior will be between a 29.5 inch low 
over hudson bay, a 29.4 inch low over the mouth of the st lawrence 
river, a low of 29.7 inches over the black hills, a high of 30.1 
inches over oklahoma, and a weak 29.9 inch high over the 
saskatchewan/manitoba line. the hudson bay and black hills lows will 
work to pass a 29.8 inch trough over lake superior thursday night 
into friday, with the lows consolidating over quebec and the 
canadian maritimes by saturday morning, leaving remnant 29.8 inch 
troughing over lake superior.



lsz264-042000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1001 am edt mon may 4 2026

...gale warning in effect until 8 pm edt this evening...

.rest of today...southwest winds 20 to 30 knots becoming west
gales to 35 knots in the afternoon. a slight chance of rain
showers by late morning. waves 4 to 7 feet occasionally to 9 feet
building to 6 to 9 feet occasionally to 11 feet. 
.tonight...west gales to 35 knots diminishing to 20 to 30 knots
after midnight. waves subsiding to 3 to 6 feet occasionally to
8 feet. 
.tuesday...west winds 15 to 25 knots. waves subsiding to 3 to
5 feet occasionally to 7 feet. 
.tuesday night...west winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots. waves calm to 2 feet. 
.wednesday night...west winds 5 to 15 knots veering northwest
after midnight. waves calm to 2 feet. 
.thursday...west winds 5 to 15 knots. waves calm to 2 feet. 
.friday...west winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 041401
glfls 
expires:202605042000;;001551

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon may 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...

a 29.0 inch low over northwest ontario this morning is sending a 
29.2 inch trough across lake superior today. the low lifts near 
james bay at 29.2 inches by tuesday morning as 30.2 inch ridging 
builds east of the canadian rockies. the low continues lifting into 
far northern quebec through wednesday as high pressure over the 
canadian prairie splits and moves to the canadian four corners and 
the southern plains at 30.0 inches and 30.2 inches respectively. by 
thursday afternoon, lake superior will be between a 29.5 inch low 
over hudson bay, a 29.4 inch low over the mouth of the st lawrence 
river, a low of 29.7 inches over the black hills, a high of 30.1 
inches over oklahoma, and a weak 29.9 inch high over the 
saskatchewan/manitoba line. the hudson bay and black hills lows will 
work to pass a 29.8 inch trough over lake superior thursday night 
into friday, with the lows consolidating over quebec and the 
canadian maritimes by saturday morning, leaving remnant 29.8 inch 
troughing over lake superior.



lsz265-042000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1001 am edt mon may 4 2026

.rest of today...west winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible in the
afternoon. a chance of rain showers. waves 3 to 6 feet
occasionally to 8 feet. 
.tonight...west winds to 30 knots with a few gale force gusts to
35 knots possible diminishing to 20 to 30 knots late. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.tuesday...west winds 20 to 30 knots diminishing to 15 to
25 knots late. waves subsiding to 1 to 3 feet. 
.tuesday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 10 to 20 knots. waves calm to 2 feet. 
.wednesday night...west winds 10 to 20 knots. waves calm to
2 feet. 
.thursday...west winds 5 to 15 knots backing southwest. waves
calm to 2 feet. 
.friday...west winds 10 to 20 knots diminishing to 5 to 15 knots.
waves calm to 2 feet. 

$$

fzus63 kmqt 041401
glfls 
expires:202605042000;;001552

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon may 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...

a 29.0 inch low over northwest ontario this morning is sending a 
29.2 inch trough across lake superior today. the low lifts near 
james bay at 29.2 inches by tuesday morning as 30.2 inch ridging 
builds east of the canadian rockies. the low continues lifting into 
far northern quebec through wednesday as high pressure over the 
canadian prairie splits and moves to the canadian four corners and 
the southern plains at 30.0 inches and 30.2 inches respectively. by 
thursday afternoon, lake superior will be between a 29.5 inch low 
over hudson bay, a 29.4 inch low over the mouth of the st lawrence 
river, a low of 29.7 inches over the black hills, a high of 30.1 
inches over oklahoma, and a weak 29.9 inch high over the 
saskatchewan/manitoba line. the hudson bay and black hills lows will 
work to pass a 29.8 inch trough over lake superior thursday night 
into friday, with the lows consolidating over quebec and the 
canadian maritimes by saturday morning, leaving remnant 29.8 inch 
troughing over lake superior.



lsz266-042000-
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 mon may 4 2026

...gale warning in effect until 8 pm edt this evening...

.rest of today...southwest winds 20 to 30 knots becoming west
gales to 35 knots in the afternoon. a chance of rain showers.
waves 4 to 7 feet occasionally to 9 feet building to 6 to 9 feet
occasionally to 11 feet. 
.tonight...west winds 20 to 30 knots. waves subsiding to 5 to
8 feet occasionally to 10 feet. 
.tuesday...west winds 20 to 30 knots. waves subsiding to 3 to
5 feet occasionally to 7 feet. 
.tuesday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to 1 to 3 feet. 
.wednesday...west winds 10 to 20 knots. waves subsiding to calm
to 2 feet. 
.wednesday night...west winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...west winds 5 to 15 knots. waves calm to 2 feet. 
.friday...west winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 041401
glfls 
expires:202605042000;;001553

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon may 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...

a 29.0 inch low over northwest ontario this morning is sending a 
29.2 inch trough across lake superior today. the low lifts near 
james bay at 29.2 inches by tuesday morning as 30.2 inch ridging 
builds east of the canadian rockies. the low continues lifting into 
far northern quebec through wednesday as high pressure over the 
canadian prairie splits and moves to the canadian four corners and 
the southern plains at 30.0 inches and 30.2 inches respectively. by 
thursday afternoon, lake superior will be between a 29.5 inch low 
over hudson bay, a 29.4 inch low over the mouth of the st lawrence 
river, a low of 29.7 inches over the black hills, a high of 30.1 
inches over oklahoma, and a weak 29.9 inch high over the 
saskatchewan/manitoba line. the hudson bay and black hills lows will 
work to pass a 29.8 inch trough over lake superior thursday night 
into friday, with the lows consolidating over quebec and the 
canadian maritimes by saturday morning, leaving remnant 29.8 inch 
troughing over lake superior.



lsz267-042000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1001 am edt mon may 4 2026

.rest of today...south winds to 30 knots with a few gale force
gusts to 35 knots possible becoming southwest 20 to 30 knots in
the afternoon, then veering west late. a chance of rain showers.
waves 4 to 7 feet occasionally to 9 feet subsiding to 3 to 5 feet
occasionally to 7 feet, then building to 5 to 8 feet occasionally
to 10 feet. 
.tonight...west winds 20 to 30 knots. waves 5 to 8 feet
occasionally to 10 feet. 
.tuesday...west winds 20 to 30 knots diminishing to 15 to
25 knots late. waves subsiding to 3 to 5 feet occasionally to
7 feet. 
.tuesday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to 1 to 3 feet. 
.wednesday...west winds 10 to 20 knots. waves 1 to 3 feet. 
.wednesday night...west winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.thursday...west winds 5 to 15 knots. waves calm to 2 feet. 
.friday...west winds 5 to 15 knots. waves calm to 2 feet. 

$$