fzus63 kdtx 201348
glflh 
expires:202608202200;;051752

open lake forecast for lake huron
national weather service detroit/pontiac mi
948 am edt thu aug 20 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, builds into the great
lakes through the end of the work week maintaining light winds. a
cold front then sweeps across the area friday into saturday,
bringing the next opportunity for showers and thunderstorms.


lhz361>363-202200-
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-
948 am edt thu aug 20 2026

.rest of today...light and variable winds. waves 2 feet or less. 
.tonight...light and variable winds becoming east 5 to 10 knots
by midnight...then veering to the southeast early in the morning.
waves 2 feet or less. 
.friday...south winds 5 to 10 knots becoming southeast 10 to
15 knots in the late morning and afternoon. waves 1 to 3 feet
building to 3 to 5 feet early in the afternoon. 
.friday night...southeast winds 10 to 15 knots. a chance of
waterspouts after midnight. waves 2 to 4 feet. 
.saturday...southwest winds 5 to 10 knots becoming northwest
10 to 15 knots late in the afternoon...then increasing to 15 to
20 knots late in the evening. showers...then a chance of showers
late in the afternoon. a chance of waterspouts late in the
morning. waves 1 to 3 feet building to 4 to 6 feet late in the
afternoon. waves occasionally around 8 feet. 
.sunday...northwest winds 15 to 20 knots increasing to 20 to
25 knots early in the evening...then decreasing to 15 to 20 knots
by midnight. gusts to 30 knots. a chance of showers early in the
morning. waves 6 to 9 feet. waves occasionally around 12 feet. 
.monday...northwest winds 10 to 15 knots becoming west 5 to
10 knots by midnight. waves 3 to 5 feet. 


$$

fzus63 kdtx 201348
glflh 
expires:202608202200;;051753

open lake forecast for lake huron
national weather service detroit/pontiac mi
948 am edt thu aug 20 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, builds into the great
lakes through the end of the work week maintaining light winds. a
cold front then sweeps across the area friday into saturday,
bringing the next opportunity for showers and thunderstorms.


lhz462>464-202200-
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-
948 am edt thu aug 20 2026

.rest of today...light and variable winds becoming north 5 to
10 knots late in the afternoon. waves 2 feet or less. 
.tonight...northeast winds 5 to 10 knots veering to the east
early in the morning. waves 2 feet or less. 
.friday...southeast winds 5 to 10 knots. waves 2 feet or less. 
.friday night...east winds 5 to 10 knots becoming southeast 10 to
15 knots in the late evening and overnight. waves 1 to 3 feet. 
.saturday...south winds 5 to 10 knots veering to the northwest
late in the afternoon...then increasing to 15 to 20 knots late in
the evening. a chance of showers in the morning...then showers
and a chance of thunderstorms late in the morning. a chance of
showers late in the evening. a chance of waterspouts. waves 1 to
3 feet building to 4 to 6 feet late in the evening. waves
occasionally around 8 feet. 
.sunday...northwest winds 15 to 20 knots. gusts to 30 knots until
early evening. a chance of showers. a chance of thunderstorms
early in the evening. waves 5 to 7 feet. waves occasionally
around 10 feet. 
.monday...northwest winds 10 to 15 knots becoming north 5 to
10 knots . waves 3 to 5 feet subsiding to 1 to 3 feet by
midnight. 


$$

fzus63 kmkx 201351
glflm 
expires:202608202115;;051768

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
851 am cdt thu aug 20 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...

light to modest winds are expected today, as high pressure around
30.0 inches tracks through the western great lakes region. as the
high pressure exits to the southeast later tonight, south to 
southwest winds will develop. theses winds will increase for 
friday, along with shower and thunderstorm chances, as low 
pressure around 29.8 inches moves across the region and drags a 
cold front through lake michigan. gusty winds will then shift to 
the northwest later friday night into saturday after the front 
exits. another high pressure system around 30.2 inches is expected
to build into the region later this weekend, which may maintain 
gusty northerly winds as it moves in.


lmz261-362-364-366-563-565-567-868-202115-
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-
851 am cdt thu aug 20 2026

sheboygan wi to pentwater mi north...

.rest of today...south winds 5 to 10 kt becoming southwest. waves
1 to 2 ft. 
.tonight...south winds 10 to 15 kt increasing to 10 to 20 kt.
slight chance of showers overnight. waves 1 to 3 ft. 
.friday...south winds 10 to 20 kt increasing to 15 to 25 kt.
chance of showers. waves 3 to 5 ft. 
.friday night...southwest winds 10 to 20 kt veering to northwest.
chance of showers. waves 3 to 5 ft subsiding to 2 to 4 ft. 
.saturday...northwest winds 10 to 20 kt increasing to 30 kt in
the afternoon. waves 2 to 4 ft. 
.saturday night...north winds to 30 kt diminishing to 15 to
25 kt. waves 3 to 5 ft. 
.sunday...northwest winds to 30 kt becoming north gales to 35 kt.
waves 4 to 6 ft occasionally to 8 ft. 
.monday...northwest winds 10 to 20 kt backing to southwest. waves
1 to 2 ft.  

$$

fzus63 kmkx 201351
glflm 
expires:202608202115;;051769

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
851 am cdt thu aug 20 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...

light to modest winds are expected today, as high pressure around
30.0 inches tracks through the western great lakes region. as the
high pressure exits to the southeast later tonight, south to 
southwest winds will develop. theses winds will increase for 
friday, along with shower and thunderstorm chances, as low 
pressure around 29.8 inches moves across the region and drags a 
cold front through lake michigan. gusty winds will then shift to 
the northwest later friday night into saturday after the front 
exits. another high pressure system around 30.2 inches is expected
to build into the region later this weekend, which may maintain 
gusty northerly winds as it moves in.


lmz080-669-671-673-675-777-779-870-872-874-876-878-202115-
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-
851 am cdt thu aug 20 2026

sheboygan wi to pentwater mi south...

.rest of today...northeast winds 10 to 15 kt becoming north.
waves 1 to 2 ft. 
.tonight...north winds 10 to 15 kt backing to south 10 to 20 kt.
waves 1 to 2 ft. 
.friday...south winds 10 to 20 kt. waves 3 to 5 ft. 
.friday night...southwest winds 10 to 20 kt becoming west. chance
of showers. waves 3 to 5 ft subsiding to 1 to 3 ft. 
.saturday...northwest winds 10 to 20 kt increasing to 15 to
25 kt. waves 4 to 6 ft occasionally to 8 ft. 
.saturday night...north winds 10 to 20 kt. waves 3 to 5 ft. 
.sunday...north winds 15 to 25 kt increasing to 30 kt. waves 4 to
7 ft occasionally to 9 ft. 
.monday...north winds 10 to 15 kt becoming northeast 10 to 20 kt.
waves 1 to 2 ft.  

$$

fzus63 kmqt 201401
glfls 
expires:202608202000;;052011

open lake forecast for lake superior
national weather service marquette mi
1000 am edt thu aug 20 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...

30.0 inch high pressure expands into the rest of the great lakes at 
30.1 inches today. a weakening shortwave low of 29.8 inches moves 
towards western lake superior today, eventually bringing 29.9 inch 
troughing back over the lake tonight. friday into this weekend, a 
low pressure of around 29.8 inches transits across northern ontario, 
reinforcing 29.9 inch troughing over lake superior friday into 
saturday morning. 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 canada that drops down into the ohio river valley 
by late monday.




lsz162-202000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt thu aug 20 2026 /900 am cdt thu aug 20 2026/

.rest of today...east winds 5 to 15 knots veering southeast in
the afternoon, then becoming east 10 to 20 knots late. a chance
of showers by late morning. a slight chance of thunderstorms.
showers by mid afternoon. waves calm to 2 feet. 
.tonight...east winds 5 to 15 knots backing northeast after
midnight. a chance of showers and a slight chance of
thunderstorms through midnight. waves calm to 2 feet. 
.friday...northeast winds 5 to 15 knots backing north in the
afternoon, then backing southwest late. waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots becoming northwest 10 to
20 knots after midnight. waves calm to 2 feet. 
.saturday...northwest winds 10 to 20 knots. 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 northeast. waves calm
to 2 feet. 
.monday...east winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 201401
glfls 
expires:202608202000;;052012

open lake forecast for lake superior
national weather service marquette mi
1000 am edt thu aug 20 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...

30.0 inch high pressure expands into the rest of the great lakes at 
30.1 inches today. a weakening shortwave low of 29.8 inches moves 
towards western lake superior today, eventually bringing 29.9 inch 
troughing back over the lake tonight. friday into this weekend, a 
low pressure of around 29.8 inches transits across northern ontario, 
reinforcing 29.9 inch troughing over lake superior friday into 
saturday morning. 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 canada that drops down into the ohio river valley 
by late monday.




lsz263-202000-
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-
1000 am edt thu aug 20 2026

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

$$

fzus63 kmqt 201401
glfls 
expires:202608202000;;052013

open lake forecast for lake superior
national weather service marquette mi
1000 am edt thu aug 20 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...

30.0 inch high pressure expands into the rest of the great lakes at 
30.1 inches today. a weakening shortwave low of 29.8 inches moves 
towards western lake superior today, eventually bringing 29.9 inch 
troughing back over the lake tonight. friday into this weekend, a 
low pressure of around 29.8 inches transits across northern ontario, 
reinforcing 29.9 inch troughing over lake superior friday into 
saturday morning. 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 canada that drops down into the ohio river valley 
by late monday.




lsz264-202000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1000 am edt thu aug 20 2026

.rest of today...southwest winds less than 10 knots backing south
in the afternoon, then becoming southeast 5 to 15 knots late. a
chance of showers. waves calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots backing east late. a
chance of showers. waves building to 1 to 3 feet. 
.friday...northeast winds 5 to 15 knots backing north in the
afternoon. a slight chance of showers through early afternoon.
waves subsiding to calm to 2 feet. 
.friday night...west winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...northwest winds 10 to 20 knots. 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 west 5 to 15 knots.
waves subsiding to calm to 2 feet. 
.monday...south winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 201401
glfls 
expires:202608202000;;052014

open lake forecast for lake superior
national weather service marquette mi
1000 am edt thu aug 20 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...

30.0 inch high pressure expands into the rest of the great lakes at 
30.1 inches today. a weakening shortwave low of 29.8 inches moves 
towards western lake superior today, eventually bringing 29.9 inch 
troughing back over the lake tonight. friday into this weekend, a 
low pressure of around 29.8 inches transits across northern ontario, 
reinforcing 29.9 inch troughing over lake superior friday into 
saturday morning. 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 canada that drops down into the ohio river valley 
by late monday.




lsz265-202000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1000 am edt thu aug 20 2026

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

$$

fzus63 kmqt 201401
glfls 
expires:202608202000;;052015

open lake forecast for lake superior
national weather service marquette mi
1000 am edt thu aug 20 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...

30.0 inch high pressure expands into the rest of the great lakes at 
30.1 inches today. a weakening shortwave low of 29.8 inches moves 
towards western lake superior today, eventually bringing 29.9 inch 
troughing back over the lake tonight. friday into this weekend, a 
low pressure of around 29.8 inches transits across northern ontario, 
reinforcing 29.9 inch troughing over lake superior friday into 
saturday morning. 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 canada that drops down into the ohio river valley 
by late monday.




lsz266-202000-
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-
1000 am edt thu aug 20 2026

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

$$

fzus63 kmqt 201401
glfls 
expires:202608202000;;052016

open lake forecast for lake superior
national weather service marquette mi
1000 am edt thu aug 20 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...

30.0 inch high pressure expands into the rest of the great lakes at 
30.1 inches today. a weakening shortwave low of 29.8 inches moves 
towards western lake superior today, eventually bringing 29.9 inch 
troughing back over the lake tonight. friday into this weekend, a 
low pressure of around 29.8 inches transits across northern ontario, 
reinforcing 29.9 inch troughing over lake superior friday into 
saturday morning. 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 canada that drops down into the ohio river valley 
by late monday.




lsz267-202000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1000 am edt thu aug 20 2026

.rest of today...southeast winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then becoming south 15 to 25 knots late.
a chance of showers. a slight chance of thunderstorms after
midnight. waves building to 1 to 3 feet. 
.friday...south winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. a chance of showers. a slight chance
of thunderstorms by mid afternoon. waves building to 2 to 4 feet,
then subsiding to calm to 2 feet. 
.friday night...south winds 10 to 20 knots veering northwest
after midnight. a slight chance of thunderstorms through
midnight. a chance of showers. waves calm to 2 feet. 
.saturday...northwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet. 
.saturday night...northwest winds 20 to 30 knots veering north
after midnight. waves building to 3 to 5 feet occasionally to
7 feet. 
.sunday...northwest winds 20 to 30 knots diminishing to 10 to
20 knots. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to calm to 2 feet. 
.monday...northwest winds 10 to 20 knots backing southwest. waves
calm to 2 feet. 

$$