fzus63 kmqt 232001
glfls 
expires:202609240800;;940681

open lake forecast for lake superior
national weather service marquette mi
401 pm 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 along with mainly easterly winds. 
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 through 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.




lsz162-240800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt wed sep 23 2026 /301 pm cdt wed sep 23 2026/

.late this afternoon...northeast winds 10 to 20 knots. waves calm
to 2 feet building to 1 to 3 feet. 
.tonight...east winds 10 to 20 knots veering south after
midnight, then diminishing to 5 to 15 knots late. 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. a slight chance of showers through
midnight. waves calm to 2 feet. 
.friday...south winds less than 10 knots becoming northeast 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. waves calm to 2 feet. 
.saturday night...east winds 5 to 15 knots veering south after
midnight. a chance of showers. waves calm to 2 feet. 
.sunday...southwest winds 5 to 15 knots diminishing to less than
10 knots. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots increasing to 10 to 20 knots.
a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 232001
glfls 
expires:202609240800;;940682

open lake forecast for lake superior
national weather service marquette mi
401 pm 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 along with mainly easterly winds. 
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 through 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.




lsz263-240800-
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 wed sep 23 2026

.late this afternoon...east winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...east winds 10 to 20 knots veering south after
midnight, then diminishing to 5 to 15 knots late. 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 backing east by mid
afternoon. waves calm to 2 feet. 
.saturday night...southeast winds 5 to 15 knots veering south
after midnight. waves calm to 2 feet. 
.sunday...southwest winds 5 to 15 knots. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots increasing to 10 to 20 knots.
a chance of showers. waves building to 1 to 3 feet. 

$$