fzus63 kmqt 230757
glfls 
expires:202609232000;;913671

open lake forecast for lake superior
national weather service marquette mi
357 am edt wed sep 23 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...

30.6 inch high pressure currently over quebec strengthens to 30.7 
inches this morning. this keeps a 30.5 inch ridge over lake superior 
while mainly easterly surface winds persist through today. the 
quebec high begins to break down thursday morning, weakening to 30.4 
inches by thursday night as winds veer southerly. by late friday, 
the high weakens to 30.2 inches over the eastern great lakes basin 
as 29.5 inch low pressure develops over montana. southerly flow 
persists through saturday as the high deteriorates further and the 
montana low pressure deepens and moves north toward the canadian 
prairies. by sunday morning, high pressure shifts northeast, leaving 
pressure to 30.1 inches over lake superior, which decreases to 30.0 
inches by monday morning as the high shifts toward the canadian 
maritimes.




lsz162-232000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
357 am edt wed sep 23 2026 /257 am cdt wed sep 23 2026/

.early this morning...southeast winds 5 to 15 knots. waves calm
to 2 feet. 
.today...southeast winds 5 to 15 knots backing east in the
afternoon, then becoming northeast 10 to 20 knots late. waves
building to 1 to 3 feet. 
.tonight...east winds 10 to 20 knots becoming south 5 to 15 knots
after midnight. waves subsiding to calm to 2 feet, then building
to 1 to 3 feet. 
.thursday...south winds 5 to 15 knots backing east late. a slight
chance of showers 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...south winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.friday night...east winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots veering south. a chance of
showers. waves calm to 2 feet. 
.sunday...southwest winds 5 to 15 knots becoming west less than
10 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 230757
glfls 
expires:202609232000;;913672

open lake forecast for lake superior
national weather service marquette mi
357 am edt wed sep 23 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...

30.6 inch high pressure currently over quebec strengthens to 30.7 
inches this morning. this keeps a 30.5 inch ridge over lake superior 
while mainly easterly surface winds persist through today. the 
quebec high begins to break down thursday morning, weakening to 30.4 
inches by thursday night as winds veer southerly. by late friday, 
the high weakens to 30.2 inches over the eastern great lakes basin 
as 29.5 inch low pressure develops over montana. southerly flow 
persists through saturday as the high deteriorates further and the 
montana low pressure deepens and moves north toward the canadian 
prairies. by sunday morning, high pressure shifts northeast, leaving 
pressure to 30.1 inches over lake superior, which decreases to 30.0 
inches by monday morning as the high shifts toward the canadian 
maritimes.




lsz263-232000-
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-
357 am edt wed sep 23 2026

.early this morning...southeast winds 5 to 15 knots. waves calm
to 2 feet. 
.today...southeast winds 5 to 15 knots backing east in the
afternoon. waves calm to 2 feet. 
.tonight...southeast winds 10 to 20 knots veering south after
midnight, then diminishing to 5 to 15 knots late. waves building
to 1 to 3 feet, then subsiding to calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing east late. waves
calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots veering south
after midnight. waves calm to 2 feet. 
.friday...southwest winds 5 to 15 knots backing northeast by mid
afternoon. waves calm to 2 feet. 
.friday night...east winds 5 to 15 knots veering southeast after
midnight. waves calm to 2 feet. 
.saturday...southeast winds 5 to 15 knots veering south. a chance
of showers. waves calm to 2 feet. 
.sunday...southwest winds 5 to 15 knots. waves calm to 2 feet. 

$$