fzus63 kdtx 160150
glflh 
expires:202608161000;;262903

open lake forecast for lake huron
national weather service detroit/pontiac mi
950 pm edt sat aug 15 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 of 30.20 inches moves over the northeast
through today as low pressure of 29.6 inches moves east across
ontario. as the low tracks east, it will push a cold front across
the central great lakes region late this evening. this cold front
brings in a 6-8 hour bout of 20-25 knot northwest winds tonight
into early monday morning and chances for thunderstorms this
afternoon and evening.


lhz361-161000-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
950 pm edt sat aug 15 2026

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


$$

fzus63 kdtx 160150
glflh 
expires:202608161000;;262904

open lake forecast for lake huron
national weather service detroit/pontiac mi
950 pm edt sat aug 15 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 of 30.20 inches moves over the northeast
through today as low pressure of 29.6 inches moves east across
ontario. as the low tracks east, it will push a cold front across
the central great lakes region late this evening. this cold front
brings in a 6-8 hour bout of 20-25 knot northwest winds tonight
into early monday morning and chances for thunderstorms this
afternoon and evening.


lhz362-363-161000-
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-
950 pm edt sat aug 15 2026

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


$$

fzus63 kdtx 160150
glflh 
expires:202608161000;;262905

open lake forecast for lake huron
national weather service detroit/pontiac mi
950 pm edt sat aug 15 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 of 30.20 inches moves over the northeast
through today as low pressure of 29.6 inches moves east across
ontario. as the low tracks east, it will push a cold front across
the central great lakes region late this evening. this cold front
brings in a 6-8 hour bout of 20-25 knot northwest winds tonight
into early monday morning and chances for thunderstorms this
afternoon and evening.


lhz462>464-161000-
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-
950 pm edt sat aug 15 2026

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


$$

fzus63 kmkx 160208
glflm 
expires:202608160930;;263532

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
908 pm cdt sat aug 15 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 around 29.9 inches in manitoba will move northeast
toward james bay tonight into sunday morning. an associated cold
front is expected to move across the lake sunday. southeast winds
out ahead of the front will turn to northwesterly and become
breezy behind the front. periods of scattered showers and
thunderstorms will be possible along and ahead of the front
tonight through sunday morning. severe weather is not 
anticipated.

a new area of 30.1 inch high pressure will build in from the
northern great plains late sunday night into monday, bringing
light and variable winds to the waters through the majority of
monday and monday evening. a slow-moving cold front will approach
from the northern great plains tuesday into wednesday, bringing
increasing southwest winds and chances for thunderstorms. precise
timing details will continue to be refined over coming forecasts,
though it does appear that a few stronger storms could be possible
over the southern half of the waters tuesday afternoon & night.
winds will trend light and variable behind the front from
wednesday night through the end of next week.


lmz261-362-364-366-563-565-567-868-160930-
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-
908 pm cdt sat aug 15 2026

sheboygan wi to pentwater mi north...

.rest of tonight...east winds 10 to 20 kt veering to south.
slight chance of showers overnight. waves 1 to 3 ft. 
.sunday...southwest winds 10 to 15 kt increasing to 10 to 20 kt
late in the morning, then becoming west early in the afternoon
becoming north 15 to 25 kt late. chance of showers and slight
chance of thunderstorms in the morning, then slight chance of
showers in the afternoon. waves 1 to 2 ft building to 2 to 4 ft. 
.sunday night...north winds 15 to 25 kt becoming northwest 10 to
15 kt. waves 2 to 4 ft subsiding to 1 to 3 ft. 
.monday...northwest winds 10 to 15 kt backing to southwest 10 to
20 kt. waves 1 to 3 ft. 
.monday night...south winds 10 to 20 kt becoming southwest. waves
1 to 2 ft building to 2 to 4 ft. 
.tuesday...southwest winds 15 to 25 kt. chance of showers and
thunderstorms in the afternoon. waves 2 to 4 ft. 
.tuesday night...northwest winds 10 to 20 kt becoming north.
chance of showers. waves 2 to 4 ft. 
.wednesday...north winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft. 
.thursday...north winds 10 to 15 kt backing to southwest 10 to
20 kt. waves 1 to 2 ft.  

$$

fzus63 kmkx 160208
glflm 
expires:202608160930;;263533

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
908 pm cdt sat aug 15 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 around 29.9 inches in manitoba will move northeast
toward james bay tonight into sunday morning. an associated cold
front is expected to move across the lake sunday. southeast winds
out ahead of the front will turn to northwesterly and become
breezy behind the front. periods of scattered showers and
thunderstorms will be possible along and ahead of the front
tonight through sunday morning. severe weather is not 
anticipated.

a new area of 30.1 inch high pressure will build in from the
northern great plains late sunday night into monday, bringing
light and variable winds to the waters through the majority of
monday and monday evening. a slow-moving cold front will approach
from the northern great plains tuesday into wednesday, bringing
increasing southwest winds and chances for thunderstorms. precise
timing details will continue to be refined over coming forecasts,
though it does appear that a few stronger storms could be possible
over the southern half of the waters tuesday afternoon & night.
winds will trend light and variable behind the front from
wednesday night through the end of next week.


lmz080-669-671-673-675-777-779-870-872-874-876-878-160930-
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-
908 pm cdt sat aug 15 2026

sheboygan wi to pentwater mi south...

.rest of tonight...southeast winds 5 to 10 kt becoming south
10 to 15 kt. chance of sprinkles through early evening, then
chance of showers and thunderstorms overnight. waves 1 to 3 ft
subsiding to 1 to 2 ft. 
.sunday...southwest winds 10 to 15 kt becoming northwest 10 to
20 kt. chance of showers and slight chance of thunderstorms in
the morning, then slight chance of showers and thunderstorms in
the afternoon. waves 1 to 2 ft. 
.sunday night...northwest winds 10 to 20 kt becoming north. waves
2 to 4 ft. 
.monday...north winds 10 to 15 kt becoming northwest 10 to 20 kt.
waves 2 to 4 ft. 
.monday night...southwest winds 10 to 20 kt. waves 1 to 2 ft
building to 2 to 4 ft. 
.tuesday...southwest winds 10 to 20 kt. waves 2 to 4 ft. 
.tuesday night...southwest winds 10 to 20 kt becoming northwest.
showers likely with a chance of thunderstorms. waves 2 to 4 ft. 
.wednesday...north winds 10 to 20 kt increasing to 30 kt. chance
of showers. waves 2 to 4 ft. 
.thursday...northeast winds 10 to 15 kt becoming east 10 to
20 kt. waves 1 to 3 ft.  

$$

fzus63 kmqt 160201
glfls 
expires:202608160800;;263168

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt sat aug 15 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 29.9 inch low between thunder bay and the northwest angle builds 
into lake superior at 29.8 inches later tonight. the associated low 
continues to deepen to 29.7 inches as it reaches quebec just south 
of james bay late sunday afternoon. meanwhile, a 30.2 inch high over 
the northern plains on sunday weakens to 30.0 inches as it slides 
generally south of the great lakes early in the week. this allows 
29.8 inch troughing to return to lake superior on tuesday morning. 
around the same time, a 30.1 inch high over the canadian prairies 
and northern plains weakens to 30.0 inches and heads east into the 
great lakes for wednesday and thursday. this ridging shifts east 
into new england thursday night into friday as a 29.8 inch trough 
builds over lake superior from a parent low of at least 29.7 inches 
over northern ontario.




lsz162-160800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt sat aug 15 2026 /901 pm cdt sat aug 15 2026/

.rest of tonight...northeast winds 5 to 15 knots backing west
late. a slight chance of thunderstorms by midnight. a chance of
showers. waves 1 to 3 feet subsiding to calm to 2 feet. 
.sunday...west winds 10 to 20 knots. waves calm to 2 feet. 
.sunday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing west late. waves calm
to 2 feet. 
.monday...west winds 5 to 15 knots becoming southwest 15 to
25 knots by mid afternoon. waves building to 1 to 3 feet. 
.monday night...southwest winds 10 to 20 knots veering west after
midnight. a slight chance of thunderstorms through midnight. a
chance of showers. waves subsiding to calm to 2 feet. 
.tuesday...west winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. waves calm to 2 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.wednesday...southwest winds 5 to 15 knots veering north. waves
calm to 2 feet. 
.thursday...south winds 5 to 15 knots veering southwest. waves
calm to 2 feet. 

$$

fzus63 kmqt 160201
glfls 
expires:202608160800;;263169

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt sat aug 15 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 29.9 inch low between thunder bay and the northwest angle builds 
into lake superior at 29.8 inches later tonight. the associated low 
continues to deepen to 29.7 inches as it reaches quebec just south 
of james bay late sunday afternoon. meanwhile, a 30.2 inch high over 
the northern plains on sunday weakens to 30.0 inches as it slides 
generally south of the great lakes early in the week. this allows 
29.8 inch troughing to return to lake superior on tuesday morning. 
around the same time, a 30.1 inch high over the canadian prairies 
and northern plains weakens to 30.0 inches and heads east into the 
great lakes for wednesday and thursday. this ridging shifts east 
into new england thursday night into friday as a 29.8 inch trough 
builds over lake superior from a parent low of at least 29.7 inches 
over northern ontario.




lsz263-160800-
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 pm edt sat aug 15 2026

.rest of tonight...east winds 5 to 15 knots backing northeast
after midnight, then backing northwest late. showers likely and a
chance of thunderstorms by midnight, then a slight chance of
showers after midnight. waves 1 to 3 feet subsiding to calm to
2 feet. 
.sunday...west winds 10 to 20 knots. a slight chance of showers
through early afternoon. waves building to 1 to 3 feet. 
.sunday night...west winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight, then backing west late. waves subsiding
to calm to 2 feet. 
.monday...west winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet. 
.monday night...southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. a slight chance of thunderstorms
through midnight. a chance of showers. waves subsiding to calm to
2 feet. 
.tuesday...west winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. waves calm to 2 feet. 
.tuesday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing west. waves
calm to 2 feet. 
.thursday...southwest winds 10 to 20 knots backing south. waves
calm to 2 feet. 

$$

fzus63 kmqt 160201
glfls 
expires:202608160800;;263170

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt sat aug 15 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 29.9 inch low between thunder bay and the northwest angle builds 
into lake superior at 29.8 inches later tonight. the associated low 
continues to deepen to 29.7 inches as it reaches quebec just south 
of james bay late sunday afternoon. meanwhile, a 30.2 inch high over 
the northern plains on sunday weakens to 30.0 inches as it slides 
generally south of the great lakes early in the week. this allows 
29.8 inch troughing to return to lake superior on tuesday morning. 
around the same time, a 30.1 inch high over the canadian prairies 
and northern plains weakens to 30.0 inches and heads east into the 
great lakes for wednesday and thursday. this ridging shifts east 
into new england thursday night into friday as a 29.8 inch trough 
builds over lake superior from a parent low of at least 29.7 inches 
over northern ontario.




lsz264-160800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1001 pm edt sat aug 15 2026

.rest of tonight...east winds 10 to 20 knots becoming southeast
5 to 15 knots after midnight, then veering northwest late.
showers likely and a chance of thunderstorms. waves 1 to 3 feet
subsiding to calm to 2 feet. 
.sunday...northwest winds 10 to 20 knots backing west late. a
slight chance of showers through early afternoon. waves building
to 1 to 3 feet, then subsiding to calm to 2 feet. 
.sunday night...west winds 5 to 15 knots veering northwest after
midnight, then backing west late. waves calm to 2 feet. 
.monday...west winds 10 to 20 knots backing southwest by mid
afternoon. waves building to 1 to 3 feet. 
.monday night...southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. a chance of showers. waves building to
2 to 4 feet, then subsiding to calm to 2 feet. 
.tuesday...west winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing west. waves
calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots backing south. waves
calm to 2 feet. 

$$

fzus63 kmqt 160201
glfls 
expires:202608160800;;263171

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt sat aug 15 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 29.9 inch low between thunder bay and the northwest angle builds 
into lake superior at 29.8 inches later tonight. the associated low 
continues to deepen to 29.7 inches as it reaches quebec just south 
of james bay late sunday afternoon. meanwhile, a 30.2 inch high over 
the northern plains on sunday weakens to 30.0 inches as it slides 
generally south of the great lakes early in the week. this allows 
29.8 inch troughing to return to lake superior on tuesday morning. 
around the same time, a 30.1 inch high over the canadian prairies 
and northern plains weakens to 30.0 inches and heads east into the 
great lakes for wednesday and thursday. this ridging shifts east 
into new england thursday night into friday as a 29.8 inch trough 
builds over lake superior from a parent low of at least 29.7 inches 
over northern ontario.




lsz265-160800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1001 pm edt sat aug 15 2026

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

$$

fzus63 kmqt 160201
glfls 
expires:202608160800;;263172

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt sat aug 15 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 29.9 inch low between thunder bay and the northwest angle builds 
into lake superior at 29.8 inches later tonight. the associated low 
continues to deepen to 29.7 inches as it reaches quebec just south 
of james bay late sunday afternoon. meanwhile, a 30.2 inch high over 
the northern plains on sunday weakens to 30.0 inches as it slides 
generally south of the great lakes early in the week. this allows 
29.8 inch troughing to return to lake superior on tuesday morning. 
around the same time, a 30.1 inch high over the canadian prairies 
and northern plains weakens to 30.0 inches and heads east into the 
great lakes for wednesday and thursday. this ridging shifts east 
into new england thursday night into friday as a 29.8 inch trough 
builds over lake superior from a parent low of at least 29.7 inches 
over northern ontario.




lsz266-160800-
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 pm edt sat aug 15 2026

.rest of tonight...southeast winds 10 to 20 knots veering south
after midnight. a chance of showers by midnight. a chance of
thunderstorms. showers likely after midnight. waves 1 to 3 feet
subsiding to calm to 2 feet. 
.sunday...northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. a slight chance of showers through
early afternoon. waves building to 3 to 5 feet occasionally to
7 feet. 
.sunday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to calm to 2 feet.
.monday...west winds 5 to 15 knots. waves calm to 2 feet. 
.monday night...south winds 5 to 15 knots becoming southwest
15 to 25 knots after midnight. a slight chance of showers after
midnight. waves calm to 2 feet. 
.tuesday...west winds 10 to 20 knots. waves building to 1 to
3 feet, then subsiding to calm to 2 feet. 
.tuesday night...west winds 10 to 20 knots veering northwest
after midnight. waves calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots. waves calm to 2 feet.
.thursday...southwest winds 5 to 15 knots backing south. waves
calm to 2 feet. 

$$

fzus63 kmqt 160201
glfls 
expires:202608160800;;263173

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt sat aug 15 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 29.9 inch low between thunder bay and the northwest angle builds 
into lake superior at 29.8 inches later tonight. the associated low 
continues to deepen to 29.7 inches as it reaches quebec just south 
of james bay late sunday afternoon. meanwhile, a 30.2 inch high over 
the northern plains on sunday weakens to 30.0 inches as it slides 
generally south of the great lakes early in the week. this allows 
29.8 inch troughing to return to lake superior on tuesday morning. 
around the same time, a 30.1 inch high over the canadian prairies 
and northern plains weakens to 30.0 inches and heads east into the 
great lakes for wednesday and thursday. this ridging shifts east 
into new england thursday night into friday as a 29.8 inch trough 
builds over lake superior from a parent low of at least 29.7 inches 
over northern ontario.




lsz267-160800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1001 pm edt sat aug 15 2026

.rest of tonight...southeast winds 10 to 20 knots veering south
late. a chance of showers. a chance of thunderstorms after
midnight. waves calm to 2 feet building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.sunday...southwest winds 10 to 20 knots becoming northwest 15 to
25 knots in the afternoon, then increasing to 20 to 30 knots
late. a chance of showers and a slight chance of thunderstorms
through early afternoon. waves building to 3 to 5 feet
occasionally to 7 feet. 
.sunday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 1 to 3 feet. 
.monday...west winds 5 to 15 knots. waves subsiding to calm to
2 feet. 
.monday night...south winds 5 to 15 knots increasing to 10 to
20 knots after midnight. a slight chance of showers after
midnight. waves calm to 2 feet. 
.tuesday...west winds 10 to 20 knots. a chance of showers. waves
building to 1 to 3 feet, then subsiding to calm to 2 feet. 
.tuesday night...west winds 10 to 20 knots veering northwest
after midnight. waves calm to 2 feet. 
.wednesday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves calm to 2 feet. 
.thursday...west winds 5 to 15 knots backing south. waves calm to
2 feet. 

$$