fzus63 kmqt 212001
glfls 
expires:202609220800;;834864

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon sep 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...

30.4 inch high pressure sprawled out over ontario begins to shift 
eastward into quebec tonight, keeping winds out of the e/ne. the 
high slowly builds to 30.5 inches over quebec by midday tuesday, 
trailing a 30.4 inch ridge over lake superior while mainly easterly 
surface winds persist. the high builds further to 30.6 inches by 
wednesday, remaining through wednesday night before weakening to 
30.4 inches by thursday night. meanwhile, winds gradually veer 
through midweek, becoming southerly 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.




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

.late this afternoon...northeast winds 15 to 25 knots. waves 1 to
3 feet building to 2 to 4 feet, then subsiding to 1 to 3 feet. 
.tonight...east winds 10 to 20 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
in the afternoon, then becoming northeast 15 to 25 knots late.
waves building to 2 to 4 feet. 
.tuesday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering southeast late. waves
subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.wednesday...southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...east winds 10 to 20 knots veering south after
midnight. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 
.thursday...south winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.thursday night...east winds 5 to 15 knots becoming south less
than 10 knots after midnight. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...southeast winds 5 to 15 knots veering south. a chance
of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202609220800;;834865

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon sep 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...

30.4 inch high pressure sprawled out over ontario begins to shift 
eastward into quebec tonight, keeping winds out of the e/ne. the 
high slowly builds to 30.5 inches over quebec by midday tuesday, 
trailing a 30.4 inch ridge over lake superior while mainly easterly 
surface winds persist. the high builds further to 30.6 inches by 
wednesday, remaining through wednesday night before weakening to 
30.4 inches by thursday night. meanwhile, winds gradually veer 
through midweek, becoming southerly 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.




lsz263-220800-
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 mon sep 21 2026

.late this afternoon...east winds 15 to 25 knots. waves 1 to
3 feet. 
.tonight...east winds 10 to 20 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
late. waves calm to 2 feet. 
.tuesday night...east winds 10 to 20 knots becoming southeast
5 to 15 knots after midnight. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.wednesday night...southeast winds 10 to 20 knots veering south
after midnight. waves building to 1 to 3 feet, then subsiding to
calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots veering south
after midnight. waves calm to 2 feet. 
.friday...south winds 5 to 15 knots backing southeast. waves calm
to 2 feet. 
.saturday...southeast winds 5 to 15 knots veering south. waves
calm to 2 feet. 

$$