fzus63 kmqt 210801
glfls 
expires:202608212000;;096629

open lake forecast for lake superior
national weather service marquette mi
400 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 through lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through tomorrow morning, we could see the low deepen to 29.8 inches 
over eastern lake superior by tonight. 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 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-
400 am edt fri aug 21 2026 /300 am cdt fri aug 21 2026/

.early this morning...northeast winds 5 to 15 knots. patchy fog.
waves calm to 2 feet. 
.today...north winds 5 to 15 knots backing west in the afternoon,
then backing southwest late. patchy fog through early afternoon.
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 210801
glfls 
expires:202608212000;;096630

open lake forecast for lake superior
national weather service marquette mi
400 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 through lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through tomorrow morning, we could see the low deepen to 29.8 inches 
over eastern lake superior by tonight. 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 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-
400 am edt fri aug 21 2026

.early this morning...south winds 5 to 15 knots. patchy fog. a
slight chance of showers. waves calm to 2 feet. 
.today...northeast winds 5 to 15 knots backing northwest in the
afternoon, then backing west late. patchy fog through early
afternoon. a slight chance of showers through early afternoon.
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 building to 1 to 3 feet. 
.sunday...north winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. waves subsiding to 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 building to 1 to 3 feet. 

$$