fzus63 kmqt 212001
glfls 
expires:202608220800;;125716

open lake forecast for lake superior
national weather service marquette mi
400 pm 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. 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 early wednesday morning. 




lsz162-220800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt fri aug 21 2026 /301 pm cdt fri aug 21 2026/

.late this afternoon...southwest winds 5 to 15 knots. waves calm
to 2 feet. 
.tonight...west winds 5 to 15 knots becoming northwest 10 to
20 knots late. a slight chance of showers and thunderstorms.
waves calm to 2 feet. 
.saturday...northwest winds 10 to 20 knots backing west late.
waves calm to 2 feet. 
.saturday night...north winds 10 to 20 knots. waves calm to
2 feet. 
.sunday...north winds 5 to 15 knots veering south by mid
afternoon. waves calm to 2 feet. 
.sunday night...south winds 5 to 15 knots becoming north less
than 10 knots after midnight. waves calm to 2 feet. 
.monday...north winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.monday night...east winds 5 to 15 knots becoming south less than
10 knots after midnight. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots veering west. a chance of
showers and thunderstorms. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots becoming northwest 5 to
15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202608220800;;125717

open lake forecast for lake superior
national weather service marquette mi
400 pm 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. 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 early wednesday morning. 




lsz263-220800-
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 fri aug 21 2026

.late this afternoon...west winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...southwest winds 5 to 15 knots veering west after
midnight, then becoming northwest 10 to 20 knots late. a slight
chance of showers and thunderstorms. 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. waves building to
1 to 3 feet. 
.sunday...north winds 10 to 20 knots becoming west 5 to 15 knots
by mid afternoon. waves building to 2 to 4 feet, then subsiding
to calm to 2 feet. 
.sunday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.monday...northwest winds less than 10 knots becoming southwest
5 to 15 knots by mid afternoon. waves calm to 2 feet. 
.monday night...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. a chance of thunderstorms. showers
likely. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots becoming northwest 5 to
15 knots. waves calm to 2 feet. 

$$