fzus63 kdtx 201955
glflh 
expires:202607210400;;306340

open lake forecast for lake huron
national weather service detroit/pontiac mi
355 pm edt mon jul 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 influence wanes across the central great
lakes today with dry initial conditions, then a cold front passes
through tonight into tuesday. this leads to periods of showers
and thunderstorms. wet weather could persist on tuesday before
high pressure from alberta/manitoba builds in by tuesday evening
with a drying effect.


lhz361-210400-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
355 pm edt mon jul 20 2026

.tonight...south winds 10 to 15 knots increasing to 15 to
20 knots after midnight. patchy smoke in the evening. a chance of
showers and thunderstorms in the evening...then showers likely
and a chance of thunderstorms after midnight. waves 4 to 6 feet. 
.tuesday...southwest winds 15 to 20 knots becoming west 20 to
25 knots with gusts to around 30 knots in the afternoon. waves
4 to 6 feet building to 6 to 9 feet late in the afternoon. waves
occasionally around 12 feet. 
.tuesday night...northwest winds to 30 knots with gusts to
35 knot gales. waves 8 to 12 feet. waves occasionally around
15 feet. 
.wednesday...northwest winds to 30 knots decreasing to 20 to
25 knots in the late morning and afternoon. gusts to 35 knot
gales. waves 8 to 12 feet. waves occasionally around 15 feet. 
.wednesday night...northwest winds 15 to 20 knots with gusts to
around 30 knots decreasing to 10 to 15 knots in the late evening
and overnight. waves 6 to 9 feet subsiding to 2 to 4 feet after
midnight. waves occasionally around 12 feet. 
.thursday...west winds 10 to 15 knots becoming southwest 5 to
10 knots late in the afternoon. waves 1 to 3 feet. 
.friday...southwest winds 10 to 15 knots decreasing to 5 to
10 knots in the late morning and early afternoon...then backing
to the south . waves 2 feet or less. 
.saturday...southwest winds 5 to 10 knots backing to the south .
a chance of showers by midnight. waves 2 feet or less. 


$$

fzus63 kdtx 201955
glflh 
expires:202607210400;;306341

open lake forecast for lake huron
national weather service detroit/pontiac mi
355 pm edt mon jul 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 influence wanes across the central great
lakes today with dry initial conditions, then a cold front passes
through tonight into tuesday. this leads to periods of showers
and thunderstorms. wet weather could persist on tuesday before
high pressure from alberta/manitoba builds in by tuesday evening
with a drying effect.


lhz362-363-210400-
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-
355 pm edt mon jul 20 2026

.tonight...south winds 15 to 20 knots with gusts to around
30 knots. patchy smoke in the evening. a chance of thunderstorms
in the evening...then a chance of showers and thunderstorms after
midnight. waves 6 to 9 feet. waves occasionally around 12 feet. 
.tuesday...southwest winds 15 to 20 knots decreasing to 10 to
15 knots in the late morning and early afternoon...then becoming
west 15 to 20 knots with gusts to around 30 knots late in the
afternoon. a chance of showers. waves 6 to 9 feet. waves
occasionally around 12 feet. 
.tuesday night...northwest winds to 30 knots decreasing to 20 to
25 knots after midnight. gusts to 35 knot gales. waves 10 to
14 feet. waves occasionally around 18 feet. 
.wednesday...northwest winds 20 to 25 knots with gusts to around
30 knots. waves 10 to 14 feet. waves occasionally around 18 feet.
.wednesday night...northwest winds 20 to 25 knots with gusts to
around 30 knots decreasing to 10 to 15 knots. waves 8 to 12 feet
subsiding to 5 to 7 feet after midnight. waves occasionally
around 15 feet. 
.thursday...west winds 10 to 15 knots decreasing to 5 to 10 knots
late in the morning...then backing to the south late in the
afternoon. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday...southwest winds 5 to 10 knots becoming south 10 to
15 knots early in the evening...then decreasing to 5 to 10 knots
by midnight. waves 2 feet or less. 
.saturday...southwest winds 5 to 10 knots becoming south 10 to
15 knots . waves 2 feet or less. 


$$

fzus63 kdtx 201955
glflh 
expires:202607210400;;306342

open lake forecast for lake huron
national weather service detroit/pontiac mi
355 pm edt mon jul 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 influence wanes across the central great
lakes today with dry initial conditions, then a cold front passes
through tonight into tuesday. this leads to periods of showers
and thunderstorms. wet weather could persist on tuesday before
high pressure from alberta/manitoba builds in by tuesday evening
with a drying effect.


lhz462>464-210400-
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-
355 pm edt mon jul 20 2026

.tonight...south winds 15 to 20 knots. gusts to 30 knots early in
the morning. patchy smoke. a chance of thunderstorms after
midnight. waves 3 to 5 feet building to 5 to 7 feet early in the
morning. waves occasionally around 10 feet. 
.tuesday...southwest winds 15 to 20 knots with gusts to around
30 knots decreasing to 10 to 15 knots in the afternoon. a chance
of showers and thunderstorms. waves 3 to 5 feet. 
.tuesday night...northwest winds 15 to 20 knots increasing to
20 to 25 knots with gusts to around 30 knots in the late evening
and overnight. waves 8 to 12 feet. waves occasionally around
15 feet. 
.wednesday...northwest winds 20 to 25 knots decreasing to 15 to
20 knots early in the afternoon. gusts to 30 knots. waves 10 to
14 feet. waves occasionally around 18 feet. 
.wednesday night...north winds 15 to 20 knots becoming northwest
10 to 15 knots in the late evening and overnight. waves 8 to
12 feet subsiding to 5 to 7 feet after midnight. waves
occasionally around 15 feet. 
.thursday...west winds 5 to 10 knots backing to the south late in
the afternoon. waves 3 to 5 feet subsiding to 2 feet or less. 
.friday...southwest winds 5 to 10 knots backing to the southeast
. 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. 


$$

fzus63 kmkx 202103
glflm 
expires:202607210300;;310069

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
403 pm cdt mon jul 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...

wildfire smoke still encompasses parts of the lake but it is no
longer dense and no longer significantly impacting visibilities
and thus the marine dense smoke advisory is no longer in effect.

low pressure around 29.4 inches tracking southeast across manitoba
into ontario will drag a cold front across the lake tonight. 
south to southwest winds ahead of the front have become gusty. an
occasional gale force gust will be possible this afternoon and 
evening over the northern half of the lake. strong to severe 
thunderstorms will also be possible this afternoon through tonight
across the entire lake. winds will veer northwest behind the cold
front and remain gusty. then winds veer due north later tuesday 
into tuesday night with gusts to gale force possible. heading into
wednesday winds are expected to diminish becoming light and 
variable by wednesday night as high pressures around 30.1 inches 
builds into the great lakes region.


lmz080-669-671-673-675-777-779-870-872-874-876-878-210300-
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-
403 pm cdt mon jul 20 2026

sheboygan wi to pentwater mi south...

.tonight...south winds to 30 kt becoming west. patchy smoke this
evening. chance of showers and thunderstorms. waves 5 to 8 ft
occasionally to 10 ft. 
.tuesday...west winds to 30 kt becoming northwest. slight chance
of showers in the afternoon. waves 4 to 7 ft occasionally to 9 ft
subsiding to 4 to 6 ft occasionally to 8 ft. 
.tuesday night...north winds to 30 kt. waves 4 to 7 ft
occasionally to 9 ft building to 7 to 10 ft occasionally to
13 ft. 
.wednesday...north winds to 30 kt. waves 7 to 10 ft occasionally
to 13 ft. 
.wednesday night...north winds to 30 kt backing to west 5 to
10 kt overnight. waves 4 to 7 ft occasionally to 9 ft subsiding
to 2 to 4 ft. 
.thursday...west winds 10 to 15 kt becoming southwest 10 to
20 kt. waves 1 to 2 ft. 
.thursday night...south winds 10 to 20 kt becoming southwest.
waves 1 to 3 ft. 
.friday...southwest winds 10 to 15 kt becoming south 10 to 20 kt.
waves 1 to 3 ft. 
.saturday...southwest winds 10 to 20 kt becoming south 15 to
25 kt. waves 1 to 2 ft building to 2 to 4 ft.  

$$

fzus63 kmkx 202103
glflm 
expires:202607210300;;310068

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
403 pm cdt mon jul 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...

wildfire smoke still encompasses parts of the lake but it is no
longer dense and no longer significantly impacting visibilities
and thus the marine dense smoke advisory is no longer in effect.

low pressure around 29.4 inches tracking southeast across manitoba
into ontario will drag a cold front across the lake tonight. 
south to southwest winds ahead of the front have become gusty. an
occasional gale force gust will be possible this afternoon and 
evening over the northern half of the lake. strong to severe 
thunderstorms will also be possible this afternoon through tonight
across the entire lake. winds will veer northwest behind the cold
front and remain gusty. then winds veer due north later tuesday 
into tuesday night with gusts to gale force possible. heading into
wednesday winds are expected to diminish becoming light and 
variable by wednesday night as high pressures around 30.1 inches 
builds into the great lakes region.


lmz261-362-364-366-563-565-567-868-210300-
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-
403 pm cdt mon jul 20 2026

sheboygan wi to pentwater mi north...

.tonight...south gales to 35 kt becoming southwest late this
evening, then diminishing to 30 kt after midnight becoming west
15 to 25 kt late. patchy smoke this evening. chance of showers
and thunderstorms this evening, then slight chance of
thunderstorms overnight. waves 7 to 10 ft occasionally to 13 ft
subsiding to 4 to 6 ft occasionally to 8 ft. 
.tuesday...west winds 15 to 25 kt becoming northwest to 30 kt,
then increasing to gales to 35 kt late. patchy smoke in the
morning. slight chance of showers. waves 4 to 6 ft occasionally
to 8 ft building to 5 to 8 ft occasionally to 10 ft. 
.tuesday night...northwest gales to 35 kt becoming north to
30 kt. waves 6 to 9 ft occasionally to 12 ft. 
.wednesday...north winds to 30 kt becoming northwest. waves 5 to
8 ft occasionally to 10 ft subsiding to 4 to 7 ft occasionally to
9 ft. 
.wednesday night...west winds 15 to 25 kt diminishing to 5 to
10 kt overnight. waves 2 to 4 ft subsiding to 1 to 2 ft. 
.thursday...west winds 10 to 20 kt becoming southwest 15 to
25 kt. waves 1 to 3 ft. 
.thursday night...southwest winds 15 to 25 kt. waves 2 to 4 ft. 
.friday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 2 to 4 ft. 
.saturday...southwest winds 15 to 25 kt becoming south to 30 kt.
waves 2 to 4 ft building to 3 to 5 ft.  

$$

fzus63 kmqt 202001
glfls 
expires:202607210800;;306607

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon jul 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... 

a low pressure will track into ontario and deepen to 29.4 inches 
tonight with a 29.5 inch trough over lake superior. the low will 
then push east into quebec and retrograde to northern quebec for 
midweek. meanwhile a 30.1 inch ridge descends southeast over the 
midwest tuesday through wednesday night, moving into the ohio river 
valley on thursday with weak ridging of 29.9 inches extending back 
northwest over lake superior. another high pressure of 30.1 inches 
will move south through ontario on friday building to 30.2 inches 
over eastern ontario by saturday morning, extending a 30.1 inch 
ridge over lake superior.




lsz264-210800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 pm edt mon jul 20 2026

.late this afternoon...southwest winds 15 to 25 knots. a chance
of showers and thunderstorms. some thunderstorms may be severe.
waves 3 to 6 feet occasionally to 8 feet. 
.tonight...west winds 15 to 25 knots. patchy smoke through
midnight. a slight chance of thunderstorms through midnight. a
chance of showers. some thunderstorms may be severe. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.tuesday...northwest winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible in the
afternoon. a slight chance of showers through early afternoon.
waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday night...northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. waves subsiding to 1 to 3 feet. 
.wednesday...northwest winds 10 to 20 knots backing west by mid
afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...west winds 10 to 20 knots. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 
.thursday...southwest winds 10 to 20 knots. waves 1 to 3 feet. 
.thursday night...southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. a chance of showers and
thunderstorms. waves subsiding to calm to 2 feet. 
.friday...southwest winds 10 to 20 knots increasing to 15 to
25 knots. waves calm to 2 feet. 
.saturday...southwest winds 15 to 25 knots diminishing to 10 to
20 knots. a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 202001
glfls 
expires:202607210800;;306608

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon jul 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... 

a low pressure will track into ontario and deepen to 29.4 inches 
tonight with a 29.5 inch trough over lake superior. the low will 
then push east into quebec and retrograde to northern quebec for 
midweek. meanwhile a 30.1 inch ridge descends southeast over the 
midwest tuesday through wednesday night, moving into the ohio river 
valley on thursday with weak ridging of 29.9 inches extending back 
northwest over lake superior. another high pressure of 30.1 inches 
will move south through ontario on friday building to 30.2 inches 
over eastern ontario by saturday morning, extending a 30.1 inch 
ridge over lake superior.




lsz265-210800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 pm edt mon jul 20 2026

...gale warning in effect from tuesday morning through late
tuesday night...

.late this afternoon...south winds 20 to 30 knots. a chance of
showers and thunderstorms. some thunderstorms may be severe.
waves 2 to 4 feet. 
.tonight...southwest winds 20 to 30 knots veering west after
midnight, then increasing to gales to 35 knots late. a slight
chance of thunderstorms through midnight. a chance of showers.
some thunderstorms may be severe. waves building to 3 to 5 feet
occasionally to 7 feet. 
.tuesday...northwest gales to 40 knots. a slight chance of
showers through early afternoon. waves building to 7 to 10 feet
occasionally to 13 feet. 
.tuesday night...northwest gales to 40 knots diminishing to 20 to
30 knots late. patchy smoke after midnight. waves subsiding to
3 to 6 feet occasionally to 8 feet. 
.wednesday...northwest winds 20 to 30 knots becoming west 15 to
25 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...west winds 15 to 25 knots. waves calm to
2 feet. 
.thursday...west winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.thursday night...southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves calm to 2 feet. 
.friday...southwest winds 10 to 20 knots. waves calm to 2 feet. 
.saturday...southwest winds 15 to 25 knots veering west. a chance
of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 202001
glfls 
expires:202607210800;;306609

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon jul 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... 

a low pressure will track into ontario and deepen to 29.4 inches 
tonight with a 29.5 inch trough over lake superior. the low will 
then push east into quebec and retrograde to northern quebec for 
midweek. meanwhile a 30.1 inch ridge descends southeast over the 
midwest tuesday through wednesday night, moving into the ohio river 
valley on thursday with weak ridging of 29.9 inches extending back 
northwest over lake superior. another high pressure of 30.1 inches 
will move south through ontario on friday building to 30.2 inches 
over eastern ontario by saturday morning, extending a 30.1 inch 
ridge over lake superior.




lsz266-210800-
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-
401 pm edt mon jul 20 2026

...gale warning in effect from tuesday morning through late
tuesday night...

.late this afternoon...south winds 15 to 25 knots. patchy smoke.
a chance of showers and thunderstorms. some thunderstorms may be
severe. waves 3 to 6 feet occasionally to 8 feet. 
.tonight...south winds 15 to 25 knots veering west after
midnight, then increasing to 20 to 30 knots late. a chance of
thunderstorms through midnight. a chance of showers. some
thunderstorms may be severe. waves subsiding to 3 to 6 feet
occasionally to 8 feet. 
.tuesday...northwest gales to 40 knots. a slight chance of
showers through early afternoon. waves building to 8 to 12 feet
occasionally to 15 feet. 
.tuesday night...northwest gales to 40 knots diminishing to 20 to
30 knots late. a slight chance of showers through midnight. waves
subsiding to 4 to 7 feet occasionally to 9 feet. 
.wednesday...northwest winds 20 to 30 knots becoming west 15 to
25 knots by mid afternoon. waves subsiding to 2 to 4 feet. 
.wednesday night...west winds 15 to 25 knots. waves subsiding to
calm to 2 feet, then building to 1 to 3 feet. 
.thursday...west winds 10 to 20 knots backing southwest by mid
afternoon. waves 1 to 3 feet. 
.thursday night...south winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. waves subsiding to calm to 2 feet.
.friday...south winds 5 to 15 knots increasing to 10 to 20 knots.
waves calm to 2 feet. 
.saturday...south winds 10 to 20 knots veering southwest. a
chance of showers, then showers likely. waves building to 1 to
3 feet. 

$$

fzus63 kmqt 202001
glfls 
expires:202607210800;;306610

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon jul 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... 

a low pressure will track into ontario and deepen to 29.4 inches 
tonight with a 29.5 inch trough over lake superior. the low will 
then push east into quebec and retrograde to northern quebec for 
midweek. meanwhile a 30.1 inch ridge descends southeast over the 
midwest tuesday through wednesday night, moving into the ohio river 
valley on thursday with weak ridging of 29.9 inches extending back 
northwest over lake superior. another high pressure of 30.1 inches 
will move south through ontario on friday building to 30.2 inches 
over eastern ontario by saturday morning, extending a 30.1 inch 
ridge over lake superior.




lsz267-210800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 pm edt mon jul 20 2026

...gale warning in effect from tuesday morning through late
tuesday night...

.late this afternoon...south winds 20 to 30 knots. a chance of
showers and thunderstorms. waves 3 to 5 feet occasionally to
7 feet. 
.tonight...south winds 15 to 25 knots veering west late. a chance
of thunderstorms through midnight. a chance of showers. some
thunderstorms may be severe. waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet. 
.tuesday...west winds 20 to 30 knots becoming northwest gales to
40 knots in the afternoon. a chance of showers. waves building to
8 to 12 feet occasionally to 15 feet. 
.tuesday night...northwest gales to 35 knots. a slight chance of
showers through midnight. waves subsiding to 5 to 8 feet
occasionally to 10 feet. 
.wednesday...northwest winds 20 to 30 knots backing west by mid
afternoon. waves subsiding to 3 to 6 feet occasionally to 8 feet.
.wednesday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.thursday...west winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.thursday night...south winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. waves calm to 2 feet. 
.friday...southwest winds 5 to 15 knots becoming south 10 to
20 knots. waves calm to 2 feet. 
.saturday...south winds 10 to 20 knots veering southwest. showers
likely. waves building to 1 to 3 feet. 

$$

fzus63 kmqt 202001
glfls 
expires:202607210800;;306605

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon jul 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... 

a low pressure will track into ontario and deepen to 29.4 inches 
tonight with a 29.5 inch trough over lake superior. the low will 
then push east into quebec and retrograde to northern quebec for 
midweek. meanwhile a 30.1 inch ridge descends southeast over the 
midwest tuesday through wednesday night, moving into the ohio river 
valley on thursday with weak ridging of 29.9 inches extending back 
northwest over lake superior. another high pressure of 30.1 inches 
will move south through ontario on friday building to 30.2 inches 
over eastern ontario by saturday morning, extending a 30.1 inch 
ridge over lake superior.




lsz162-210800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt mon jul 20 2026 /301 pm cdt mon jul 20 2026/

.late this afternoon...west winds 20 to 30 knots. patchy smoke. a
slight chance of showers and thunderstorms. some thunderstorms
may be severe. waves 3 to 6 feet occasionally to 8 feet. 
.tonight...west winds 20 to 30 knots. patchy smoke through
midnight. a slight chance of showers and thunderstorms after
midnight. waves subsiding to 1 to 3 feet. 
.tuesday...northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then veering north late. waves
building to 2 to 4 feet, then subsiding to calm to 2 feet. 
.tuesday night...north winds 10 to 20 knots backing northwest
after midnight. waves calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots becoming southwest
10 to 20 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet. 
.thursday...southwest winds 10 to 20 knots. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 
.thursday night...southwest winds 5 to 15 knots. waves calm to
2 feet. 
.friday...southwest winds 10 to 20 knots. a chance of showers.
waves calm to 2 feet. 
.saturday...southwest winds 15 to 25 knots diminishing to 10 to
20 knots. a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 202001
glfls 
expires:202607210800;;306606

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon jul 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... 

a low pressure will track into ontario and deepen to 29.4 inches 
tonight with a 29.5 inch trough over lake superior. the low will 
then push east into quebec and retrograde to northern quebec for 
midweek. meanwhile a 30.1 inch ridge descends southeast over the 
midwest tuesday through wednesday night, moving into the ohio river 
valley on thursday with weak ridging of 29.9 inches extending back 
northwest over lake superior. another high pressure of 30.1 inches 
will move south through ontario on friday building to 30.2 inches 
over eastern ontario by saturday morning, extending a 30.1 inch 
ridge over lake superior.




lsz263-210800-
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-
401 pm edt mon jul 20 2026

.late this afternoon...west winds 20 to 30 knots. patchy smoke. a
chance of showers and thunderstorms. some thunderstorms may be
severe. waves 3 to 6 feet occasionally to 8 feet. 
.tonight...west winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. patchy smoke through midnight. a chance
of showers. a slight chance of thunderstorms after midnight.
waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.tuesday...northwest winds 20 to 30 knots veering north late.
waves subsiding to 2 to 4 feet. 
.tuesday night...north winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. patchy smoke through midnight.
waves subsiding to calm to 2 feet. 
.wednesday...northwest winds 10 to 20 knots backing southwest by
mid afternoon. waves building to 1 to 3 feet. 
.wednesday night...southwest winds 10 to 20 knots veering west
after midnight. waves subsiding to calm to 2 feet, then building
to 1 to 3 feet. 
.thursday...southwest winds 15 to 25 knots. waves building to
2 to 4 feet, then subsiding to 1 to 3 feet. 
.thursday night...southwest winds 10 to 20 knots. a chance of
showers and thunderstorms. waves subsiding to calm to 2 feet. 
.friday...southwest winds 10 to 20 knots increasing to 15 to
25 knots. waves calm to 2 feet. 
.saturday...southwest winds 15 to 25 knots diminishing to 10 to
20 knots. a chance of showers. waves building to 1 to 3 feet,
then subsiding to calm to 2 feet. 

$$