fzus63 kmqt 200801
glfls 
expires:202609202000;;754154

open lake forecast for lake superior
national weather service marquette mi
400 am edt sun sep 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...

today and monday, a 30.2 inch high over manitoba builds to 30.4 
inches as it moves into northwestern ontario. this high pressure 
center slowly builds to 30.5 inches as it shifts into quebec by 
midday tuesday, trailing a 30.4 inch ridge over lake superior. the 
high builds further to 30.6 inches wednesday as it progresses 
eastward. the high, still over southern quebec, weakens to 30.4 
inches thursday. by late friday, the high weakens to 30.3 inches 
over the eastern great lakes basin as 29.5 inch low pressure 
develops over montana.




lsz162-202000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt sun sep 20 2026 /301 am cdt sun sep 20 2026/

.early this morning...northeast winds 15 to 25 knots. waves calm
to 2 feet building to 1 to 3 feet. 
.today...northeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then becoming east 15 to 25 knots
late. waves building to 3 to 6 feet occasionally to 8 feet. 
.tonight...east winds 10 to 20 knots. waves subsiding to 1 to
3 feet. 
.monday...east winds 10 to 20 knots. waves subsiding to calm to
2 feet, then building to 2 to 4 feet. 
.monday night...east winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.tuesday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves building to 1 to 3 feet. 
.tuesday night...east winds 10 to 20 knots becoming southeast
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...east winds 10 to 20 knots. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing east. waves calm to
2 feet. 

$$

fzus63 kmqt 200801
glfls 
expires:202609202000;;754155

open lake forecast for lake superior
national weather service marquette mi
400 am edt sun sep 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...

today and monday, a 30.2 inch high over manitoba builds to 30.4 
inches as it moves into northwestern ontario. this high pressure 
center slowly builds to 30.5 inches as it shifts into quebec by 
midday tuesday, trailing a 30.4 inch ridge over lake superior. the 
high builds further to 30.6 inches wednesday as it progresses 
eastward. the high, still over southern quebec, weakens to 30.4 
inches thursday. by late friday, the high weakens to 30.3 inches 
over the eastern great lakes basin as 29.5 inch low pressure 
develops over montana.




lsz263-202000-
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 am edt sun sep 20 2026

.early this morning...northeast winds 15 to 25 knots. waves 1 to
3 feet building to 2 to 4 feet. 
.today...northeast winds 15 to 25 knots. waves building to 3 to
6 feet occasionally to 8 feet. 
.tonight...northeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight. waves subsiding to 1 to 3 feet. 
.monday...east winds 5 to 15 knots increasing to 10 to 20 knots
late. waves subsiding to calm to 2 feet, then building to 1 to
3 feet. 
.monday night...east winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.tuesday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves calm to 2 feet. 
.tuesday night...east winds 10 to 20 knots becoming southeast
5 to 15 knots after midnight. waves calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots veering south. waves
calm to 2 feet. 
.thursday...south winds 5 to 15 knots. waves calm to 2 feet. 

$$