fzus63 kdtx 211347
glflh 
expires:202607212200;;350174

open lake forecast for lake huron
national weather service detroit/pontiac mi
947 am edt tue jul 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...a cold front tracks across the great lakes late
tonight, with potential for strong to severe thunderstorms in its
wake. a second cold front then sweeps across the area tuesday
evening, bringing a brief period of gusts to gale force. high
pressure fills in mid-week for a drier pattern to end the work
week.


lhz361-212200-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
947 am edt tue jul 21 2026

.rest of today...west 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 afternoon. waves 3 to 5 feet building to 6 to 9 
feet late in the afternoon. waves occasionally around 12 feet. 
.tonight...northwest winds to 30 knots with brief gusts to 35 
knot gales. waves 8 to 12 feet. waves occasionally around 15 feet.
.wednesday...northwest winds 20 to 25 knots. gusts to 30 knots
early in the morning then 30 knots early in the afternoon. waves
6 to 9 feet. waves occasionally around 12 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 3 to 5 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 1 to 3 feet. 
.saturday...southwest winds 5 to 10 knots backing to the
southeast . a chance of showers by midnight. waves 2 feet or
less. 


$$

fzus63 kdtx 211347
glflh 
expires:202607212200;;350175

open lake forecast for lake huron
national weather service detroit/pontiac mi
947 am edt tue jul 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...a cold front tracks across the great lakes late
tonight, with potential for strong to severe thunderstorms in its
wake. a second cold front then sweeps across the area tuesday
evening, bringing a brief period of gusts to gale force. high
pressure fills in mid-week for a drier pattern to end the work
week.


lhz362-363-212200-
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-
947 am edt tue jul 21 2026

.rest of today...southwest winds 10 to 15 knots becoming west
15 to 20 knots with gusts to around 30 knots late in the
afternoon. a chance of showers. waves 4 to 6 feet building to
6 to 9 feet late in the afternoon. waves occasionally around
12 feet. 
.tonight...northwest winds to 30 knots with brief gusts to 35 
knot gales. waves 10 to 14 feet. waves occasionally around 18 
feet. 
.wednesday...northwest winds 20 to 25 knots. gusts to 30 knots
early in the morning then 30 knots early in the afternoon. 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 5 to 7 feet. waves occasionally around
10 feet. 
.thursday...west winds 5 to 10 knots 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 southeast 10 to
15 knots early in the evening...then becoming south 5 to 10 knots
by midnight. waves 1 to 3 feet. 
.saturday...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. a chance of showers by midnight. waves 1 to 3 feet. 


$$

fzus63 kdtx 211347
glflh 
expires:202607212200;;350176

open lake forecast for lake huron
national weather service detroit/pontiac mi
947 am edt tue jul 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...a cold front tracks across the great lakes late
tonight, with potential for strong to severe thunderstorms in its
wake. a second cold front then sweeps across the area tuesday
evening, bringing a brief period of gusts to gale force. high
pressure fills in mid-week for a drier pattern to end the work
week.


lhz462>464-212200-
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-
947 am edt tue jul 21 2026

.rest of today...west winds 10 to 15 knots. a chance of showers
and thunderstorms. waves 3 to 5 feet. 
.tonight...northwest winds 15 to 20 knots increasing to 20 to
25 knots with brief gusts to around 30 knots in the late evening 
and overnight. a chance of showers and thunderstorms in the 
evening. waves 6 to 9 feet building to 10 to 14 feet in the late 
evening and overnight. waves occasionally around 18 feet. 
.wednesday...northwest winds 20 to 25 knots decreasing to 15 to
20 knots early in the afternoon. waves 8 to 12 feet. waves
occasionally around 15 feet. 
.wednesday night...northwest winds 10 to 15 knots. waves 4 to
6 feet. waves occasionally around 8 feet. 
.thursday...northwest winds 5 to 10 knots in the morning becoming
light and variable...then becoming south 5 to 10 knots late in
the afternoon. waves 2 to 4 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 early in the morning
becoming light and variable...then becoming south 5 to 10 knots .
waves 2 feet or less. 


$$

fzus63 kmkx 211343
glflm 
expires:202607212115;;350045

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
843 am cdt tue jul 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...

low pressure tracking east through ontario and into quebec is 
dragging a secondary backdoor cold front down the lake this 
morning through the afternoon. breezy northwest winds will veer 
north behind the secondary cold front through early evening, with 
a few gusts to gale force possible behind the front. winds are 
expected to gradually weaken through the day wednesday, as high 
pressure around 30.2 inches builds into the great lakes region 
from the west.


lmz261-362-364-366-563-565-567-868-212115-
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-
843 am cdt tue jul 21 2026

sheboygan wi to pentwater mi north...

.rest of today...west winds 15 to 25 kt becoming northwest to
30 kt. chance of showers this afternoon. waves 4 to 6 ft
occasionally to 8 ft building to 6 to 9 ft occasionally to 12 ft.
.tonight...northwest winds to 30 kt. waves 7 to 10 ft
occasionally to 13 ft subsiding to 5 to 8 ft occasionally to
10 ft. 
.wednesday...northwest winds to 30 kt becoming north 15 to 25 kt.
waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to 4 ft. 
.wednesday night...northwest winds 15 to 25 kt becoming west
10 to 15 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 2 to 4 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 to 30 kt becoming south. waves 2 to
4 ft.  

$$

fzus63 kmkx 211343
glflm 
expires:202607212115;;350046

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
843 am cdt tue jul 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...

low pressure tracking east through ontario and into quebec is 
dragging a secondary backdoor cold front down the lake this 
morning through the afternoon. breezy northwest winds will veer 
north behind the secondary cold front through early evening, with 
a few gusts to gale force possible behind the front. winds are 
expected to gradually weaken through the day wednesday, as high 
pressure around 30.2 inches builds into the great lakes region 
from the west.


lmz080-669-671-673-675-777-779-870-872-874-876-878-212115-
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-
843 am cdt tue jul 21 2026

sheboygan wi to pentwater mi south...

.rest of today...west winds 15 to 25 kt becoming northwest to
30 kt. slight chance of showers and thunderstorms this afternoon.
waves 4 to 7 ft occasionally to 9 ft. 
.tonight...north winds to 30 kt diminishing to 15 to 25 kt. waves
6 to 9 ft occasionally to 12 ft building to 8 to 11 ft
occasionally to 14 ft, then subsiding to 7 to 10 ft occasionally
to 13 ft. 
.wednesday...north winds 15 to 25 kt. waves 5 to 8 ft
occasionally to 10 ft subsiding to 4 to 6 ft occasionally to
8 ft. 
.wednesday night...north winds 15 to 25 kt becoming northwest
10 to 15 kt overnight. waves 4 to 6 ft occasionally to 8 ft
subsiding to 2 to 4 ft. 
.thursday...west winds 10 to 15 kt becoming southwest 10 to
20 kt. waves 1 to 3 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 2 ft. 
.saturday...southwest winds 10 to 20 kt becoming south 15 to
25 kt. waves 1 to 2 ft building to 1 to 3 ft.  

$$

fzus63 kmqt 211401
glfls 
expires:202607212000;;350591

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue jul 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... 

as a 29.2 inch low over far northern ontario this morning moves into 
northern quebec later today, troughing from the low over lake 
superior is replaced by ridging descending from a 30.1 inch high 
moving in from the canadian prairies into the midwest today into 
wednesday. the ridging over lake superior becomes maximized at 30.1 
inches over the western lake on wednesday before the high flattens 
and moves east towards new england thursday into friday morning. 
while ridging of around 30.0 inches looks to remain over lake 
superior on thursday, a weak 29.9 to 30.0 inch low could move over 
the northwestern half of the lake by thursday night into friday 
morning. as a low around 29.3 inches lifts from far northern ontario 
into hudson bay friday night into saturday morning, expect troughing 
of around 29.8 inches to move into lake superior in response by 
saturday morning. troughing of at least 29.8 inches looks to remain 
over the lake for the rest of the day. 




lsz162-212000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt tue jul 21 2026 /901 am cdt tue jul 21 2026/

.rest of today...northwest winds 20 to 30 knots diminishing to
15 to 25 knots in the afternoon, then veering north late. waves
1 to 3 feet subsiding to calm to 2 feet. 
.tonight...north winds 10 to 20 knots backing northwest after
midnight. waves calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing southwest in
the afternoon, then increasing to 10 to 20 knots late. waves
building to 1 to 3 feet. 
.wednesday night...southwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.thursday...southwest winds 10 to 20 knots. waves building to
1 to 3 feet. 
.thursday night...southwest winds 10 to 20 knots. a chance of
showers. waves subsiding to calm to 2 feet. 
.friday...southwest winds 10 to 20 knots increasing to 20 to
30 knots. a chance of showers. waves building to 1 to 3 feet,
then subsiding to calm to 2 feet. 
.saturday...southwest winds 20 to 30 knots becoming north 10 to
20 knots. a chance of showers. waves subsiding to calm to 2 feet.

$$

fzus63 kmqt 211401
glfls 
expires:202607212000;;350592

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue jul 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... 

as a 29.2 inch low over far northern ontario this morning moves into 
northern quebec later today, troughing from the low over lake 
superior is replaced by ridging descending from a 30.1 inch high 
moving in from the canadian prairies into the midwest today into 
wednesday. the ridging over lake superior becomes maximized at 30.1 
inches over the western lake on wednesday before the high flattens 
and moves east towards new england thursday into friday morning. 
while ridging of around 30.0 inches looks to remain over lake 
superior on thursday, a weak 29.9 to 30.0 inch low could move over 
the northwestern half of the lake by thursday night into friday 
morning. as a low around 29.3 inches lifts from far northern ontario 
into hudson bay friday night into saturday morning, expect troughing 
of around 29.8 inches to move into lake superior in response by 
saturday morning. troughing of at least 29.8 inches looks to remain 
over the lake for the rest of the day. 




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-
1001 am edt tue jul 21 2026

.rest of today...northwest winds 15 to 25 knots veering north in
the afternoon. waves 3 to 5 feet occasionally to 7 feet subsiding
to 2 to 4 feet. 
.tonight...northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing west in the
afternoon, then becoming southwest 10 to 20 knots late. waves
building to 2 to 4 feet. 
.wednesday night...southwest winds 10 to 20 knots. 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. 
.thursday night...southwest winds 10 to 20 knots. a chance of
showers. waves subsiding to 1 to 3 feet. 
.friday...southwest winds 15 to 25 knots increasing to 20 to
30 knots. a chance of showers. waves building to 2 to 4 feet,
then subsiding to calm to 2 feet. 
.saturday...southwest winds 20 to 30 knots becoming north 10 to
20 knots. a chance of showers. waves subsiding to calm to 2 feet.

$$

fzus63 kmqt 211401
glfls 
expires:202607212000;;350593

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue jul 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... 

as a 29.2 inch low over far northern ontario this morning moves into 
northern quebec later today, troughing from the low over lake 
superior is replaced by ridging descending from a 30.1 inch high 
moving in from the canadian prairies into the midwest today into 
wednesday. the ridging over lake superior becomes maximized at 30.1 
inches over the western lake on wednesday before the high flattens 
and moves east towards new england thursday into friday morning. 
while ridging of around 30.0 inches looks to remain over lake 
superior on thursday, a weak 29.9 to 30.0 inch low could move over 
the northwestern half of the lake by thursday night into friday 
morning. as a low around 29.3 inches lifts from far northern ontario 
into hudson bay friday night into saturday morning, expect troughing 
of around 29.8 inches to move into lake superior in response by 
saturday morning. troughing of at least 29.8 inches looks to remain 
over the lake for the rest of the day. 




lsz264-212000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1001 am edt tue jul 21 2026

.rest of today...north winds to 30 knots with a few gale force
gusts to 35 knots possible becoming northwest 20 to 30 knots
late. waves 4 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet. 
.tonight...northwest winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to 1 to 3 feet. 
.wednesday...northwest winds 5 to 15 knots backing west in the
afternoon, then increasing to 10 to 20 knots late. waves
subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.wednesday night...west winds 10 to 20 knots. waves 1 to 3 feet. 
.thursday...southwest winds 10 to 20 knots. waves building to
2 to 4 feet. 
.thursday night...southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. a chance of showers. waves
subsiding to 1 to 3 feet. 
.friday...southwest winds 10 to 20 knots increasing to 20 to
30 knots. a chance of showers. waves building to 2 to 4 feet,
then subsiding to calm to 2 feet. 
.saturday...southwest winds 20 to 30 knots becoming north 10 to
20 knots. a chance of showers. waves subsiding to calm to 2 feet.

$$

fzus63 kmqt 211401
glfls 
expires:202607212000;;350594

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue jul 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... 

as a 29.2 inch low over far northern ontario this morning moves into 
northern quebec later today, troughing from the low over lake 
superior is replaced by ridging descending from a 30.1 inch high 
moving in from the canadian prairies into the midwest today into 
wednesday. the ridging over lake superior becomes maximized at 30.1 
inches over the western lake on wednesday before the high flattens 
and moves east towards new england thursday into friday morning. 
while ridging of around 30.0 inches looks to remain over lake 
superior on thursday, a weak 29.9 to 30.0 inch low could move over 
the northwestern half of the lake by thursday night into friday 
morning. as a low around 29.3 inches lifts from far northern ontario 
into hudson bay friday night into saturday morning, expect troughing 
of around 29.8 inches to move into lake superior in response by 
saturday morning. troughing of at least 29.8 inches looks to remain 
over the lake for the rest of the day. 




lsz265-212000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1001 am edt tue jul 21 2026

...gale warning in effect until 8 pm edt this evening...

.rest of today...northwest gales to 40 knots. waves 4 to 7 feet
occasionally to 9 feet building to 6 to 9 feet occasionally to
11 feet. 
.tonight...northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. waves subsiding to 2 to 4 feet. 
.wednesday...northwest winds 15 to 25 knots becoming west 10 to
20 knots late. waves subsiding to calm to 2 feet. 
.wednesday night...west winds 10 to 20 knots increasing to 15 to
25 knots after midnight. waves 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 10 to 20 knots becoming southwest
15 to 25 knots after midnight. waves building to 1 to 3 feet. 
.friday...southwest winds 10 to 20 knots increasing to 15 to
25 knots. a chance of showers. waves subsiding to calm to 2 feet.
.saturday...southwest winds 15 to 25 knots veering northwest. a
chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 211401
glfls 
expires:202607212000;;350595

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue jul 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... 

as a 29.2 inch low over far northern ontario this morning moves into 
northern quebec later today, troughing from the low over lake 
superior is replaced by ridging descending from a 30.1 inch high 
moving in from the canadian prairies into the midwest today into 
wednesday. the ridging over lake superior becomes maximized at 30.1 
inches over the western lake on wednesday before the high flattens 
and moves east towards new england thursday into friday morning. 
while ridging of around 30.0 inches looks to remain over lake 
superior on thursday, a weak 29.9 to 30.0 inch low could move over 
the northwestern half of the lake by thursday night into friday 
morning. as a low around 29.3 inches lifts from far northern ontario 
into hudson bay friday night into saturday morning, expect troughing 
of around 29.8 inches to move into lake superior in response by 
saturday morning. troughing of at least 29.8 inches looks to remain 
over the lake for the rest of the day. 




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-
1001 am edt tue jul 21 2026

...gale warning in effect until 8 pm edt this evening...

.rest of today...northwest gales to 40 knots. a slight chance of
showers by late morning. waves 4 to 7 feet occasionally to 9 feet
building to 7 to 10 feet occasionally to 13 feet. 
.tonight...northwest winds 20 to 30 knots. a slight chance of
showers through midnight. waves subsiding to 3 to 5 feet
occasionally to 7 feet. 
.wednesday...northwest winds 15 to 25 knots backing west late.
waves subsiding to 2 to 4 feet. 
.wednesday night...west winds 10 to 20 knots increasing to 15 to
25 knots after midnight. waves subsiding 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 10 to 20 knots becoming southwest
15 to 25 knots after midnight. waves subsiding to calm to 2 feet,
then building to 1 to 3 feet. 
.friday...south winds 10 to 20 knots increasing to 15 to
25 knots. waves subsiding to calm to 2 feet, then building to
2 to 4 feet. 
.saturday...south winds 15 to 25 knots diminishing to 10 to
20 knots. a chance of showers. waves subsiding to calm to 2 feet.

$$

fzus63 kmqt 211401
glfls 
expires:202607212000;;350596

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue jul 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... 

as a 29.2 inch low over far northern ontario this morning moves into 
northern quebec later today, troughing from the low over lake 
superior is replaced by ridging descending from a 30.1 inch high 
moving in from the canadian prairies into the midwest today into 
wednesday. the ridging over lake superior becomes maximized at 30.1 
inches over the western lake on wednesday before the high flattens 
and moves east towards new england thursday into friday morning. 
while ridging of around 30.0 inches looks to remain over lake 
superior on thursday, a weak 29.9 to 30.0 inch low could move over 
the northwestern half of the lake by thursday night into friday 
morning. as a low around 29.3 inches lifts from far northern ontario 
into hudson bay friday night into saturday morning, expect troughing 
of around 29.8 inches to move into lake superior in response by 
saturday morning. troughing of at least 29.8 inches looks to remain 
over the lake for the rest of the day. 




lsz267-212000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1001 am edt tue jul 21 2026

...gale warning in effect until 8 pm edt this evening...

.rest of today...northwest winds 20 to 30 knots increasing to
gales to 35 knots in the afternoon. a slight chance of showers by
late morning. waves 3 to 6 feet occasionally to 8 feet building
to 7 to 10 feet occasionally to 13 feet, then subsiding to 6 to
9 feet occasionally to 11 feet. 
.tonight...northwest winds 20 to 30 knots. a slight chance of
showers through midnight. waves subsiding to 3 to 6 feet
occasionally to 8 feet. 
.wednesday...northwest winds 15 to 25 knots backing west late.
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 1 to 3 feet. 
.thursday...southwest winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.thursday night...south winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. waves building to 1 to 3 feet. 
.friday...southwest winds 5 to 15 knots becoming south 15 to
25 knots. waves subsiding to calm to 2 feet, then building to
2 to 4 feet. 
.saturday...south winds 10 to 20 knots. a chance of showers.
showers likely. waves subsiding to calm to 2 feet. 

$$