fzus63 kmqt 240201
glfls 
expires:202609240800;;953657

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

a 30.6 inch high pressure centered over quebec tonight begins to 
break down thursday morning, weakening to 30.4 inches by thursday 
night. by late friday, the high weakens to 30.3 inches over the 
eastern great lakes basin as a 29.5 inch low pressure develops over 
montana. on saturday the high begins shifting northeast toward 
northern quebec while the montana low pressure deepens and moves 
north through the canadian prairies. sunday through monday, the high 
shifts east to the canadian maritimes, weakening to 30.0 inches. 
this gradually weakens high pressure ridging over lake superior from 
30.1 inches sunday morning to 29.9 inches by the end of monday as a 
29.8 inch trough approaches from the west.




lsz162-240800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt wed sep 23 2026 /901 pm cdt wed sep 23 2026/

.rest of tonight...east winds 5 to 15 knots becoming south 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
waves calm to 2 feet building to 1 to 3 feet, then subsiding to
calm to 2 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 240201
glfls 
expires:202609240800;;953658

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

a 30.6 inch high pressure centered over quebec tonight begins to 
break down thursday morning, weakening to 30.4 inches by thursday 
night. by late friday, the high weakens to 30.3 inches over the 
eastern great lakes basin as a 29.5 inch low pressure develops over 
montana. on saturday the high begins shifting northeast toward 
northern quebec while the montana low pressure deepens and moves 
north through the canadian prairies. sunday through monday, the high 
shifts east to the canadian maritimes, weakening to 30.0 inches. 
this gradually weakens high pressure ridging over lake superior from 
30.1 inches sunday morning to 29.9 inches by the end of monday as a 
29.8 inch trough approaches from the west.




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-
1001 pm edt wed sep 23 2026

.rest of tonight...southeast winds 10 to 20 knots veering south
after midnight, then diminishing to 5 to 15 knots late. waves
calm to 2 feet 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 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. 

$$