fzus63 kmqt 211401
glfls 
expires:202608212000;;109902

open lake forecast for lake superior
national weather service marquette mi
1000 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 over lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through saturday morning, the low deepens to 29.8 inches over 
eastern lake superior tonight. this is 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-
1000 am edt fri aug 21 2026 /900 am cdt fri aug 21 2026/

.rest of today...north winds 5 to 15 knots backing west in the
afternoon, then backing southwest late. 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 211401
glfls 
expires:202608212000;;109903

open lake forecast for lake superior
national weather service marquette mi
1000 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 over lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through saturday morning, the low deepens to 29.8 inches over 
eastern lake superior tonight. this is 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-
1000 am edt fri aug 21 2026

.rest of today...north winds 5 to 15 knots backing west late.
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 calm to 2 feet. 
.sunday...north winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. waves 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 calm to 2 feet. 

$$