fzus63 kdtx 210808
glflh 
expires:202608211615;;097370

open lake forecast for lake huron
national weather service detroit/pontiac mi
408 am edt fri aug 21 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, 30.00 inches, maintains influence
across the central and eastern great lakes today. the next low
pressure system then arrives saturday, dragging a cold front
across the area and increasing shower and thunderstorm chances.
post-frontal northwest flow leads to gusty winds sunday.


lhz361>363-211615-
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-
lake huron from sturgeon point to alabaster mi beyond 5nm off
shore-
408 am edt fri aug 21 2026

.today...south winds 5 to 10 knots becoming southeast 10 to
15 knots in the late morning and afternoon. a chance of showers
in the afternoon. waves 1 to 3 feet building to 2 to 4 feet in
the afternoon. 
.tonight...southeast winds 10 to 15 knots. a chance of showers. a
chance of waterspouts after midnight. waves 3 to 5 feet. 
.saturday...southwest winds 5 to 10 knots veering to the west
early in the afternoon. a chance of waterspouts in the morning. a
chance of showers. waves 2 to 4 feet subsiding to 1 to 3 feet in
the late morning and afternoon. 
.saturday night...northwest winds 10 to 15 knots increasing to
15 to 20 knots in the late evening and overnight. a chance of
showers. waves 4 to 6 feet. waves occasionally around 8 feet. 
.sunday...northwest winds 20 to 25 knots decreasing to 15 to
20 knots late in the evening. gusts to 30 knots. a chance of
showers in the morning. a chance of waterspouts in the morning.
waves 8 to 12 feet. waves occasionally around 15 feet. 
.monday...northwest winds 15 to 20 knots decreasing to 5 to
10 knots. waves 4 to 6 feet. waves occasionally around 8 feet. 
.tuesday...west winds 5 to 10 knots backing to the south . waves
1 to 3 feet. 


$$

fzus63 kdtx 210808
glflh 
expires:202608211615;;097371

open lake forecast for lake huron
national weather service detroit/pontiac mi
408 am edt fri aug 21 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, 30.00 inches, maintains influence
across the central and eastern great lakes today. the next low
pressure system then arrives saturday, dragging a cold front
across the area and increasing shower and thunderstorm chances.
post-frontal northwest flow leads to gusty winds sunday.


lhz462>464-211615-
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-
408 am edt fri aug 21 2026

.today...southeast winds 5 to 10 knots. waves 2 feet or less. 
.tonight...southeast winds 10 to 15 knots. a chance of showers
after midnight. waves 1 to 3 feet. 
.saturday...south winds 10 to 15 knots decreasing to 5 to
10 knots in the late morning and afternoon. a chance of showers
in the morning...then showers and a chance of thunderstorms in
the afternoon. a chance of waterspouts. waves 1 to 3 feet. 
.saturday night...northwest winds 5 to 10 knots increasing to
15 to 20 knots in the late evening and overnight. showers likely.
waves 1 to 3 feet building to 4 to 6 feet in the late evening and
overnight. waves occasionally around 8 feet. 
.sunday...northwest winds 15 to 20 knots with gusts to around
30 knots increasing to 20 to 25 knots with gusts to around
30 knots late in the morning...then decreasing to 15 to 20 knots
with gusts to around 30 knots late in the afternoon. a chance of
waterspouts. showers likely in the morning. a chance of showers.
waves 6 to 9 feet. waves occasionally around 11 feet. 
.monday...northwest winds 15 to 20 knots decreasing to 5 to
10 knots. a chance of showers early in the morning. waves 4 to
6 feet subsiding to 1 to 3 feet by midnight. waves occasionally
around 8 feet. 
.tuesday...west 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. 


$$

fzus63 kmkx 210807
glflm 
expires:202608211545;;097270

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
307 am cdt fri aug 21 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...

south to southwest winds will increase today as a low pressure
trough of 29.8 inches approaches southern wisconsin from the 
minnesota arrowhead. thunderstorms are expected at times today
through tonight. the trough will cross lake michigan from north 
to south tonight and bring a wind shift to the northwest. then look
for gusty northerly winds to develop along a cold front that will
track from north to south down lake michigan saturday evening. a 
few thunderstorms are possible along this front. northerly winds
will persist through sunday as low pressure around 29.6 inches
tracks from lower michigan to ontario. variable winds are 
expected for monday and tuesday as high pressure of 30.1 inches 
crosses the upper great lakes.


lmz261-362-364-366-563-565-567-868-211545-
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-
307 am cdt fri aug 21 2026

sheboygan wi to pentwater mi north...

.today...south winds 10 to 20 kt increasing to 15 to 25 kt.
chance of showers and slight chance of thunderstorms this
morning, then slight chance of showers and thunderstorms this
afternoon. waves 3 to 5 ft. 
.tonight...south winds 15 to 25 kt becoming southwest 10 to 20 kt
late in the evening, then becoming west 10 to 15 kt after
midnight and becoming north 10 to 20 kt late. chance of showers 
and thunderstorms in the evening, then slight chance of showers 
and thunderstorms overnight. patchy fog overnight. waves 3 to 5 ft
subsiding to 2 to 4 ft. 
.saturday...north winds 10 to 20 kt increasing to 30 kt. chance
of showers in the afternoon. waves 2 to 4 ft. 
.saturday night...north winds to 30 kt diminishing to 15 to
25 kt. chance of showers in the evening. waves 4 to 6 ft
occasionally to 8 ft. 
.sunday...north winds to 30 kt. waves 4 to 6 ft occasionally to
8 ft. 
.sunday night...north gales to 35 kt diminishing to 10 to 20 kt.
waves 3 to 5 ft subsiding to 1 to 3 ft. 
.monday...northwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 2 ft. 
.tuesday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft building to 2 to 4 ft.  

$$

fzus63 kmkx 210807
glflm 
expires:202608211545;;097271

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
307 am cdt fri aug 21 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...

south to southwest winds will increase today as a low pressure
trough of 29.8 inches approaches southern wisconsin from the 
minnesota arrowhead. thunderstorms are expected at times today
through tonight. the trough will cross lake michigan from north 
to south tonight and bring a wind shift to the northwest. then look
for gusty northerly winds to develop along a cold front that will
track from north to south down lake michigan saturday evening. a 
few thunderstorms are possible along this front. northerly winds
will persist through sunday as low pressure around 29.6 inches
tracks from lower michigan to ontario. variable winds are 
expected for monday and tuesday as high pressure of 30.1 inches 
crosses the upper great lakes.


lmz080-669-671-673-675-777-779-870-872-874-876-878-211545-
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-
307 am cdt fri aug 21 2026

sheboygan wi to pentwater mi south...

.today...south winds 10 to 20 kt. slight chance of showers this
morning, then chance of showers and slight chance of
thunderstorms this afternoon. waves 2 to 4 ft. 
.tonight...south winds 10 to 20 kt veering to northwest. slight
chance of showers and thunderstorms in the evening. waves 2 to
4 ft subsiding to 1 to 3 ft. 
.saturday...northwest winds 10 to 20 kt becoming north 15 to
25 kt. waves 3 to 5 ft. 
.saturday night...north winds 15 to 25 kt. waves 3 to 5 ft
building to 4 to 6 ft occasionally to 8 ft. 
.sunday...north winds to 30 kt. waves 4 to 7 ft occasionally to
9 ft. 
.sunday night...north winds 15 to 25 kt diminishing to 10 to
15 kt. waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft. 
.monday...northwest winds 10 to 20 kt becoming north. waves 1 to
2 ft. 
.tuesday...south winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft building to 2 to 4 ft.  

$$

fzus63 kmqt 210801
glfls 
expires:202608212000;;096633

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri aug 21 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 moves through lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through tomorrow morning, we could see the low deepen to 29.8 inches 
over eastern lake superior by tonight. this is quickly followed by 
30.1 inch ridging for the latter part of the weekend into early next 
week via a 30.2 inch parent high from the canadian prairies that 
drops down into the ohio river valley by late monday, weakening to 
30.1 inches as it does so. a 29.7 inch low over the canadian 
prairies monday night then drops southeast towards lake superior, 
arriving on wednesday. 




lsz266-212000-
lake superior east of a line from manitou island to marquette mi
and west of a line from grand marais mi to the us/canadian border
beyond 5nm from shore-
400 am edt fri aug 21 2026

.early this morning...south winds 10 to 20 knots. showers likely
and a slight chance of thunderstorms. waves 1 to 3 feet. 
.today...south winds 10 to 20 knots diminishing to 5 to 15 knots
late. a chance of showers. a slight chance of thunderstorms by
mid afternoon. waves subsiding to calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. a slight chance of showers through
midnight. patchy fog after midnight. waves calm to 2 feet. 
.saturday...northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. patchy dense fog through early
afternoon. waves building to 3 to 6 feet occasionally to 8 feet. 
.saturday night...north winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. waves subsiding to 3 to 6 feet
occasionally to 8 feet. 
.sunday...north winds 20 to 30 knots backing northwest by mid
afternoon. waves subsiding to 3 to 5 feet occasionally to 7 feet.
.sunday night...northwest winds 10 to 20 knots. waves subsiding
to calm to 2 feet. 
.monday...northwest winds 5 to 15 knots backing southwest. waves
calm to 2 feet. 
.tuesday...south winds 10 to 20 knots increasing to 15 to
25 knots. a chance of showers. waves building to 2 to 4 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202608212000;;096629

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri aug 21 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 moves through lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through tomorrow morning, we could see the low deepen to 29.8 inches 
over eastern lake superior by tonight. this is quickly followed by 
30.1 inch ridging for the latter part of the weekend into early next 
week via a 30.2 inch parent high from the canadian prairies that 
drops down into the ohio river valley by late monday, weakening to 
30.1 inches as it does so. a 29.7 inch low over the canadian 
prairies monday night then drops southeast towards lake superior, 
arriving on wednesday. 




lsz162-212000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt fri aug 21 2026 /300 am cdt fri aug 21 2026/

.early this morning...northeast winds 5 to 15 knots. patchy fog.
waves calm to 2 feet. 
.today...north winds 5 to 15 knots backing west in the afternoon,
then backing southwest late. patchy fog through early afternoon.
waves calm to 2 feet. 
.tonight...southwest winds 5 to 15 knots veering northwest after
midnight, then increasing to 10 to 20 knots late. waves calm to
2 feet. 
.saturday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. waves calm to 2 feet. 
.saturday night...north winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet. 
.sunday...north winds 5 to 15 knots veering south by mid
afternoon. waves calm to 2 feet. 
.sunday night...southeast winds 5 to 15 knots becoming northeast
less than 10 knots after midnight. waves calm to 2 feet. 
.monday...east winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots veering west. a chance of
showers. waves calm to 2 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202608212000;;096634

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri aug 21 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 moves through lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through tomorrow morning, we could see the low deepen to 29.8 inches 
over eastern lake superior by tonight. this is quickly followed by 
30.1 inch ridging for the latter part of the weekend into early next 
week via a 30.2 inch parent high from the canadian prairies that 
drops down into the ohio river valley by late monday, weakening to 
30.1 inches as it does so. a 29.7 inch low over the canadian 
prairies monday night then drops southeast towards lake superior, 
arriving on wednesday. 




lsz267-212000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 am edt fri aug 21 2026

.early this morning...south winds 15 to 25 knots. a chance of
showers. waves calm to 2 feet building to 1 to 3 feet. 
.today...south winds 15 to 25 knots diminishing to 10 to 20 knots
in the afternoon. a chance of showers through early afternoon. a
slight chance of thunderstorms. showers likely by mid afternoon.
waves building to 2 to 4 feet, then subsiding to calm to 2 feet. 
.tonight...south winds 5 to 15 knots becoming northwest 10 to
20 knots after midnight. a chance of showers and a slight chance
of thunderstorms through midnight. patchy fog. waves calm to
2 feet. 
.saturday...northwest winds 10 to 20 knots increasing to 15 to
25 knots late. patchy dense fog through early afternoon. waves
building to 2 to 4 feet. 
.saturday night...north winds 20 to 30 knots. waves building to
3 to 5 feet occasionally to 7 feet. 
.sunday...north winds 20 to 30 knots backing northwest by mid
afternoon. waves building to 3 to 6 feet occasionally to 8 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...northwest winds 10 to 20 knots becoming west 5 to
15 knots. waves subsiding to calm to 2 feet. 
.tuesday...southeast winds 5 to 15 knots becoming south 10 to
20 knots. a chance of showers. waves building to 1 to 3 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202608212000;;096630

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri aug 21 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 moves through lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through tomorrow morning, we could see the low deepen to 29.8 inches 
over eastern lake superior by tonight. this is quickly followed by 
30.1 inch ridging for the latter part of the weekend into early next 
week via a 30.2 inch parent high from the canadian prairies that 
drops down into the ohio river valley by late monday, weakening to 
30.1 inches as it does so. a 29.7 inch low over the canadian 
prairies monday night then drops southeast towards lake superior, 
arriving on wednesday. 




lsz263-212000-
lake superior from saxon harbor wi to upper entrance to portage
canal mi 5nm off shore to the us/canadian border including isle
royale national park-
400 am edt fri aug 21 2026

.early this morning...south winds 5 to 15 knots. patchy fog. a
slight chance of showers. waves calm to 2 feet. 
.today...northeast winds 5 to 15 knots backing northwest in the
afternoon, then backing west late. patchy fog through early
afternoon. a slight chance of showers through early afternoon.
waves calm to 2 feet. 
.tonight...southwest winds 5 to 15 knots veering northwest late.
a slight chance of showers after midnight. waves calm to 2 feet. 
.saturday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing west late. waves calm to
2 feet. 
.saturday night...north winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves building to 1 to 3 feet. 
.sunday...north winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.sunday night...southwest winds 5 to 15 knots veering west after
midnight. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots becoming west 10 to
20 knots. a chance of showers. waves building to 1 to 3 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202608212000;;096631

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri aug 21 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 moves through lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through tomorrow morning, we could see the low deepen to 29.8 inches 
over eastern lake superior by tonight. this is quickly followed by 
30.1 inch ridging for the latter part of the weekend into early next 
week via a 30.2 inch parent high from the canadian prairies that 
drops down into the ohio river valley by late monday, weakening to 
30.1 inches as it does so. a 29.7 inch low over the canadian 
prairies monday night then drops southeast towards lake superior, 
arriving on wednesday. 




lsz264-212000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 am edt fri aug 21 2026

.early this morning...southeast winds 5 to 15 knots. a chance of
showers. waves 1 to 3 feet. 
.today...southeast winds 5 to 15 knots backing north in the
afternoon, then backing northwest late. a slight chance of
showers. waves subsiding to calm to 2 feet. 
.tonight...west winds 5 to 15 knots veering northwest late.
patchy fog after midnight. waves calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. waves calm to 2 feet. 
.saturday night...north winds 10 to 20 knots. waves building to
1 to 3 feet. 
.sunday...north winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.sunday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots backing south. waves calm to
2 feet. 
.tuesday...south winds 5 to 15 knots becoming southwest 10 to
20 knots. a chance of showers. waves building to 1 to 3 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202608212000;;096632

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri aug 21 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 moves through lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through tomorrow morning, we could see the low deepen to 29.8 inches 
over eastern lake superior by tonight. this is quickly followed by 
30.1 inch ridging for the latter part of the weekend into early next 
week via a 30.2 inch parent high from the canadian prairies that 
drops down into the ohio river valley by late monday, weakening to 
30.1 inches as it does so. a 29.7 inch low over the canadian 
prairies monday night then drops southeast towards lake superior, 
arriving on wednesday. 




lsz265-212000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 am edt fri aug 21 2026

.early this morning...south winds 15 to 25 knots. a chance of
showers and a slight chance of thunderstorms. waves 1 to 3 feet. 
.today...south winds 10 to 20 knots veering northwest late. a
chance of showers. a slight chance of thunderstorms by mid
afternoon. waves subsiding to calm to 2 feet. 
.tonight...northwest winds 10 to 20 knots backing west after
midnight, then increasing to 15 to 25 knots late. waves calm to
2 feet. 
.saturday...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. 
.saturday night...northwest winds 15 to 25 knots becoming north
20 to 30 knots after midnight. waves subsiding to 2 to 4 feet,
then building to 3 to 6 feet occasionally to 8 feet. 
.sunday...north winds 15 to 25 knots. waves subsiding to 2 to
4 feet. 
.sunday night...northwest winds 10 to 20 knots. waves subsiding
to calm to 2 feet. 
.monday...northwest winds 5 to 15 knots backing south. waves calm
to 2 feet. 
.tuesday...southeast winds 10 to 20 knots becoming south 15 to
25 knots. a chance of showers. waves building to 1 to 3 feet. 

$$