fzus63 kmqt 231401
glfls 
expires:202609232000;;926875

open lake forecast for lake superior
national weather service marquette mi
1001 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...

30.7 inch high pressure is centered over quebec today, keeping a 
30.5 inch ridge over lake superior while mainly easterly surface 
winds persist. 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-
1001 am edt wed sep 23 2026 /901 am cdt wed sep 23 2026/

.rest of today...southeast winds 5 to 15 knots backing east in
the afternoon, then becoming northeast 10 to 20 knots late. waves
calm to 2 feet building to 1 to 3 feet. 
.tonight...east winds 5 to 15 knots veering south 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 231401
glfls 
expires:202609232000;;926876

open lake forecast for lake superior
national weather service marquette mi
1001 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...

30.7 inch high pressure is centered over quebec today, keeping a 
30.5 inch ridge over lake superior while mainly easterly surface 
winds persist. 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-
1001 am edt wed sep 23 2026

.rest of today...southeast winds 5 to 15 knots backing east late.
waves calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots veering south after
midnight. waves building to 1 to 3 feet. 
.thursday...south winds 5 to 15 knots backing east late. waves
subsiding to 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. 

$$