fzus63 kdtx 251930
glflh 
expires:202608260330;;350774

open lake forecast for lake huron
national weather service detroit/pontiac mi
330 pm edt tue aug 25 2026

for waters beyond five nautical miles off shore on lake huron

waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.synopsis...high pressure, 30.10 inches, holds over the great
lakes today. southwest winds will increase tonight ahead of a
cold front, which brings showers and thunderstorms to the central
great lakes tomorrow.


lhz361-260330-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
330 pm edt tue aug 25 2026

.tonight...southeast winds 5 to 10 knots becoming south 10 to
15 knots early in the morning. waves 2 feet or less. 
.wednesday...south winds 10 to 15 knots becoming southeast 5 to
10 knots late in the afternoon. a chance of showers in the
morning...then showers and a chance of thunderstorms in the
afternoon. waves 1 to 3 feet. 
.wednesday night...southeast winds 5 to 10 knots becoming west
10 to 15 knots in the late evening and overnight. showers and a
chance of thunderstorms in the evening. waves 1 to 3 feet. 
.thursday...northwest winds 10 to 15 knots. waves 2 to 4 feet. 
.thursday night...northwest winds 10 to 15 knots. waves 2 to
4 feet subsiding to 1 to 3 feet after midnight. 
.friday...north winds 5 to 10 knots backing to the west late in
the afternoon...then becoming light and variable late in the
evening. waves 2 feet or less. 
.saturday...south winds 5 to 10 knots backing to the southeast
early in the evening...then becoming south 10 to 15 knots by
midnight. waves 2 feet or less. 
.sunday...south winds 10 to 15 knots decreasing to 5 to 10 knots
. a chance of showers. waves 2 feet or less. 


$$

fzus63 kdtx 251930
glflh 
expires:202608260330;;350775

open lake forecast for lake huron
national weather service detroit/pontiac mi
330 pm edt tue aug 25 2026

for waters beyond five nautical miles off shore on lake huron

waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.synopsis...high pressure, 30.10 inches, holds over the great
lakes today. southwest winds will increase tonight ahead of a
cold front, which brings showers and thunderstorms to the central
great lakes tomorrow.


lhz362-363-260330-
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-
330 pm edt tue aug 25 2026

.tonight...southeast winds 5 to 10 knots becoming south 10 to
15 knots after midnight. waves 2 feet or less. 
.wednesday...south winds 10 to 15 knots increasing to 15 to
20 knots in the afternoon. showers likely and a chance of
thunderstorms in the afternoon. waves 1 to 3 feet building to
3 to 5 feet in the late morning and afternoon. 
.wednesday night...south winds 10 to 15 knots veering to the
southwest after midnight. a chance of showers and thunderstorms
in the evening. waves 3 to 5 feet subsiding to 2 to 4 feet after
midnight. 
.thursday...northwest winds 10 to 15 knots. waves 2 to 4 feet. 
.thursday night...northwest winds 10 to 15 knots. waves 3 to
5 feet. 
.friday...north winds 10 to 15 knots becoming light and variable.
waves 1 to 3 feet. 
.saturday...southwest winds 5 to 10 knots backing to the south
early in the evening...then increasing to 10 to 15 knots by
midnight. waves 2 feet or less. 
.sunday...south winds 10 to 15 knots. a chance of showers. waves
1 to 3 feet. 


$$

fzus63 kdtx 251930
glflh 
expires:202608260330;;350776

open lake forecast for lake huron
national weather service detroit/pontiac mi
330 pm edt tue aug 25 2026

for waters beyond five nautical miles off shore on lake huron

waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.synopsis...high pressure, 30.10 inches, holds over the great
lakes today. southwest winds will increase tonight ahead of a
cold front, which brings showers and thunderstorms to the central
great lakes tomorrow.


lhz462>464-260330-
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-
330 pm edt tue aug 25 2026

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


$$

fzus63 kmkx 251932
glflm 
expires:202608260330;;350805

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
232 pm cdt tue aug 25 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 winds will continue this evening as the pressure
gradient sharpens ahead of an approaching cold front and low
pressure of 29.7 inches just north of lake superior. breezy
south winds will continue tonight through tomorrow morning as
the front slowly approaches, with winds becoming more
southwesterly with time. the front should then pass wednesday
afternoon, with winds then becoming northwesterly and lighter
behind the front wednesday night.

the northwest winds will grow breezier for a bit on thursday
ahead of another cold front dropping south over the lake, but
winds will then become lighter and northeasterly thursday night
into friday as high pressure of 30.1 inches moves into the upper
great lakes region.



lmz261-362-364-366-563-565-567-868-260330-
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-
232 pm cdt tue aug 25 2026

sheboygan wi to pentwater mi north...

.tonight...south winds to 25 kt. chance of showers and slight 
chance of thunderstorms overnight. waves 4 to 6 ft occasionally to
8 ft. 
.wednesday...south winds to 25 kt becoming west 15 to 25 kt. 
chance of showers and slight chance of thunderstorms in the 
morning, then chance of showers and thunderstorms in the 
afternoon. waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 
5 ft. 
.wednesday night...northwest winds 10 to 20 kt. chance of
thunderstorms in the evening. waves 2 to 4 ft subsiding to 1 to
3 ft. 
.thursday...northwest winds 15 to 25 kt becoming north. waves
2 to 4 ft. 
.thursday night...north winds 15 to 25 kt diminishing to 10 to
15 kt overnight. waves 1 to 3 ft. 
.friday...north winds 10 to 15 kt. waves 1 to 2 ft. 
.friday night...southeast winds 10 to 15 kt becoming south. waves
1 to 2 ft. 
.saturday...south winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft building to 3 to 5 ft. 
.sunday...south gales to 35 kt increasing to gales to 40 kt.
chance of showers. waves 5 to 8 ft occasionally to 10 ft.  

$$

fzus63 kmkx 251932
glflm 
expires:202608260330;;350806

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
232 pm cdt tue aug 25 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 winds will continue this evening as the pressure
gradient sharpens ahead of an approaching cold front and low
pressure of 29.7 inches just north of lake superior. breezy
south winds will continue tonight through tomorrow morning as
the front slowly approaches, with winds becoming more
southwesterly with time. the front should then pass wednesday
afternoon, with winds then becoming northwesterly and lighter
behind the front wednesday night.

the northwest winds will grow breezier for a bit on thursday
ahead of another cold front dropping south over the lake, but
winds will then become lighter and northeasterly thursday night
into friday as high pressure of 30.1 inches moves into the upper
great lakes region.



lmz080-669-671-673-675-777-779-870-872-874-876-878-260330-
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-
232 pm cdt tue aug 25 2026

sheboygan wi to pentwater mi south...

.tonight...south winds 15 to 25 kt becoming southwest. chance of
showers and slight chance of thunderstorms overnight. waves 3 to
5 ft building to 4 to 6 ft occasionally to 8 ft. 
.wednesday...southwest winds to 25 kt diminishing to 10 to 20 kt.
chance of showers and slight chance of thunderstorms in the 
morning, then chance of showers and thunderstorms in the 
afternoon. waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 
5 ft. 
.wednesday night...west winds 10 to 20 kt becoming northwest.
waves 2 to 4 ft. 
.thursday...north winds 10 to 20 kt increasing to 15 to 25 kt.
waves 3 to 5 ft. 
.thursday night...north winds 10 to 20 kt becoming northeast
10 to 15 kt. waves 2 to 4 ft subsiding to 1 to 3 ft. 
.friday...northeast winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 to 2 ft. 
.friday night...east winds 10 to 20 kt veering to southeast 10 to
15 kt. waves 1 to 3 ft. 
.saturday...south winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft building to 3 to 5 ft. 
.sunday...south gales to 35 kt. waves 5 to 8 ft occasionally to
10 ft.  

$$

fzus63 kmqt 252037
glfls 
expires:202608260445;;353547

open lake forecast for lake superior
national weather service marquette mi
437 pm edt tue aug 25 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...

this afternoon, lake superior is between 30.1 inch high pressure 
over the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz162-260445-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
437 pm edt tue aug 25 2026 /337 pm cdt tue aug 25 2026/

...severe thunderstorm watch 626 in effect until 11 pm edt /10 pm
cdt/ this evening...

.late this afternoon...east winds 5 to 15 knots. a chance of
showers and thunderstorms. waves calm to 2 feet. 
.tonight...northeast winds 5 to 15 knots backing west after
midnight, then increasing to 10 to 20 knots late. a chance of
showers and thunderstorms. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots. a slight chance of
showers by mid afternoon. waves calm to 2 feet. 
.wednesday night...northwest winds 10 to 20 knots. waves calm to
2 feet. 
.thursday...north winds 5 to 15 knots veering south by mid
afternoon. waves calm to 2 feet. 
.thursday night...northeast winds 5 to 15 knots backing north
after midnight. waves calm to 2 feet. 
.friday...east winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.friday night...east winds 5 to 15 knots becoming northeast less
than 10 knots after midnight. waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 
.sunday...south winds 10 to 20 knots backing north. a chance of
showers. waves calm to 2 feet. 

$$

fzus63 kmqt 252037
glfls 
expires:202608260445;;353548

open lake forecast for lake superior
national weather service marquette mi
437 pm edt tue aug 25 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...

this afternoon, lake superior is between 30.1 inch high pressure 
over the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz263-260445-
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-
437 pm edt tue aug 25 2026

.late this afternoon...southeast winds 5 to 15 knots. a chance of
showers and thunderstorms. waves calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots veering southwest after
midnight, then becoming west 10 to 20 knots late. a chance of
showers and thunderstorms. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots. a slight chance of
showers. a slight chance of thunderstorms by mid afternoon. waves
building to 1 to 3 feet. 
.wednesday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then veering north late. waves
subsiding to calm to 2 feet. 
.thursday...north winds 5 to 15 knots. a slight chance of showers
by mid afternoon. waves calm to 2 feet. 
.thursday night...east winds 5 to 15 knots becoming north less
than 10 knots after midnight. waves calm to 2 feet. 
.friday...east winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.friday night...southeast winds 5 to 15 knots veering south after
midnight. waves calm to 2 feet. 
.saturday...south winds 5 to 15 knots increasing to 10 to
20 knots. a chance of showers. waves calm to 2 feet. 
.sunday...south winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 

$$

fzus63 kmqt 252037
glfls 
expires:202608260445;;353549

open lake forecast for lake superior
national weather service marquette mi
437 pm edt tue aug 25 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...

this afternoon, lake superior is between 30.1 inch high pressure 
over the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz264-260445-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
437 pm edt tue aug 25 2026

.late this afternoon...southeast winds 5 to 15 knots. showers
likely and a slight chance of thunderstorms. waves calm to
2 feet. 
.tonight...southeast winds 5 to 15 knots veering southwest late.
a chance of showers and thunderstorms. waves building to 1 to
3 feet, then subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots. a slight chance of
showers. waves calm to 2 feet. 
.wednesday night...northwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight, then diminishing to 5 to 15 knots
late. waves building to 1 to 3 feet. 
.thursday...north winds 5 to 15 knots backing northwest by mid
afternoon. a slight chance of showers by mid afternoon. waves
subsiding to calm to 2 feet. 
.thursday night...northwest winds 5 to 15 knots diminishing to
less than 10 knots after midnight. waves calm to 2 feet. 
.friday...northwest winds less than 10 knots becoming southwest
5 to 15 knots by mid afternoon. waves calm to 2 feet. 
.friday night...south winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...south winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 
.sunday...south winds 5 to 15 knots increasing to 10 to 20 knots.
a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 252037
glfls 
expires:202608260445;;353550

open lake forecast for lake superior
national weather service marquette mi
437 pm edt tue aug 25 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...

this afternoon, lake superior is between 30.1 inch high pressure 
over the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz265-260445-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
437 pm edt tue aug 25 2026

.late this afternoon...southeast winds 10 to 20 knots. a chance
of showers and a slight chance of thunderstorms. waves calm to
2 feet. 
.tonight...southeast winds 10 to 20 knots becoming south 15 to
25 knots after midnight, then becoming southwest 10 to 20 knots
late. showers likely through midnight. a chance of thunderstorms.
a chance of showers after midnight. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then veering northwest late. a slight
chance of thunderstorms through early afternoon. a chance of
showers. waves calm to 2 feet. 
.wednesday night...northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.thursday...north winds 10 to 20 knots. waves subsiding to 1 to
3 feet. 
.thursday night...north winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 
.friday...northwest winds 5 to 15 knots veering east by mid
afternoon. waves calm to 2 feet. 
.friday night...southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. waves calm to 2 feet. 
.saturday...southeast winds 10 to 20 knots becoming south 15 to
25 knots. a chance of showers. waves calm to 2 feet. 
.sunday...south winds 15 to 25 knots. a chance of showers. waves
calm to 2 feet. 

$$

fzus63 kmqt 252037
glfls 
expires:202608260445;;353551

open lake forecast for lake superior
national weather service marquette mi
437 pm edt tue aug 25 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...

this afternoon, lake superior is between 30.1 inch high pressure 
over the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz266-260445-
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-
437 pm edt tue aug 25 2026

.late this afternoon...southeast winds 10 to 20 knots. a chance
of showers and a slight chance of thunderstorms. waves calm to
2 feet. 
.tonight...south winds 15 to 25 knots diminishing to 10 to
20 knots late. showers likely through midnight. a chance of
thunderstorms. a chance of showers after midnight. waves building
to 1 to 3 feet. 
.wednesday...southwest winds 10 to 20 knots veering northwest
late. a chance of showers and a slight chance of thunderstorms.
waves subsiding to calm to 2 feet. 
.wednesday night...northwest winds 15 to 25 knots veering north
late. waves building to 3 to 5 feet occasionally to 7 feet. 
.thursday...north winds 10 to 20 knots backing northwest by mid
afternoon. waves subsiding to 1 to 3 feet. 
.thursday night...northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. waves 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...south winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet. 
.saturday...south winds 15 to 25 knots. a chance of showers.
waves building to 1 to 3 feet. 
.sunday...south winds 15 to 25 knots diminishing to 10 to
20 knots. a chance of showers. waves subsiding to calm to 2 feet.

$$

fzus63 kmqt 252037
glfls 
expires:202608260445;;353552

open lake forecast for lake superior
national weather service marquette mi
437 pm edt tue aug 25 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...

this afternoon, lake superior is between 30.1 inch high pressure 
over the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz267-260445-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
437 pm edt tue aug 25 2026

.late this afternoon...southeast winds 10 to 20 knots. a slight
chance of showers. waves calm to 2 feet. 
.tonight...south winds 10 to 20 knots increasing to 15 to
25 knots after midnight. a chance of showers through midnight. a
chance of thunderstorms. showers likely after midnight. waves
building to 1 to 3 feet. 
.wednesday...south winds 10 to 20 knots veering west in the
afternoon. a chance of showers and thunderstorms. waves subsiding
to calm to 2 feet. 
.wednesday night...west winds 10 to 20 knots becoming northwest
15 to 25 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet. 
.thursday...north winds 15 to 25 knots backing northwest by mid
afternoon. waves subsiding to 2 to 4 feet. 
.thursday night...northwest winds 10 to 20 knots veering north
after midnight. waves subsiding to calm to 2 feet. 
.friday...northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.friday night...south winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...south winds 5 to 15 knots increasing to 15 to
25 knots. a chance of showers. waves building to 1 to 3 feet. 
.sunday...south winds 10 to 20 knots. showers likely, then a
chance of showers. waves subsiding to calm to 2 feet. 

$$