fzus63 kmqt 210801
glfls 
expires:202609212000;;807389

open lake forecast for lake superior
national weather service marquette mi
401 am 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...

a 30.3 inch centered over southern ontario this morning builds to 
30.4 inches as it moves east toward the ontario-quebec border, 
resulting in veering flow from northeasterly to easterly of less 
than 20 knots over lake superior. the high slowly builds to 30.5 
inches as it shifts into quebec by midday tuesday, trailing a 30.4 
inch ridge over lake superior while surface winds persist as 
easterly. the high builds further to 30.6 inches by wednesday, 
remaining through wednesday night before weakening to 30.4 inches by 
thursday night. meanwhile, veering winds continue on to become 
southerly by thursday afternoon. 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.




lsz162-212000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt mon sep 21 2026 /301 am cdt mon sep 21 2026/

.early this morning...east winds 10 to 20 knots. waves calm to
2 feet. 
.today...east winds 10 to 20 knots becoming northeast 15 to
25 knots late. waves building 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 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...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. waves calm to
2 feet. 
.friday...east winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202609212000;;807390

open lake forecast for lake superior
national weather service marquette mi
401 am 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...

a 30.3 inch centered over southern ontario this morning builds to 
30.4 inches as it moves east toward the ontario-quebec border, 
resulting in veering flow from northeasterly to easterly of less 
than 20 knots over lake superior. the high slowly builds to 30.5 
inches as it shifts into quebec by midday tuesday, trailing a 30.4 
inch ridge over lake superior while surface winds persist as 
easterly. the high builds further to 30.6 inches by wednesday, 
remaining through wednesday night before weakening to 30.4 inches by 
thursday night. meanwhile, veering winds continue on to become 
southerly by thursday afternoon. 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.




lsz263-212000-
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-
401 am edt mon sep 21 2026

.early this morning...east winds 5 to 15 knots. waves calm to
2 feet. 
.today...east winds 5 to 15 knots increasing to 15 to 25 knots.
waves building to 1 to 3 feet. 
.tonight...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. 
.tuesday...east winds less than 10 knots increasing to 10 to
20 knots. 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 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. waves calm to 2 feet. 
.friday...south winds 5 to 15 knots backing southeast. waves calm
to 2 feet. 

$$