fzus63 kmqt 230201
glfls 
expires:202609230800;;900333

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt tue sep 22 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...

30.5 inc high pressure currently centered over the ontario/quebec 
border strengthens 30.6 inches over quebec by wednesday morning. this 
keeps 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 light 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.




lsz162-230800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt tue sep 22 2026 /901 pm cdt tue sep 22 2026/

.rest of tonight...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering southeast late. waves 1 to
3 feet subsiding to calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. waves building
to 1 to 3 feet. 
.wednesday night...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 by mid
afternoon. a slight chance of showers. 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...southeast winds 10 to 20 knots veering south. a
chance of showers. waves calm to 2 feet. 
.sunday...southwest winds 5 to 15 knots veering west. waves calm
to 2 feet. 

$$

fzus63 kmqt 230201
glfls 
expires:202609230800;;900334

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt tue sep 22 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...

30.5 inc high pressure currently centered over the ontario/quebec 
border strengthens 30.6 inches over quebec by wednesday morning. this 
keeps 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 light 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.




lsz263-230800-
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 tue sep 22 2026

.rest of tonight...east winds 10 to 20 knots becoming southeast
5 to 15 knots after midnight. waves 1 to 3 feet subsiding to calm
to 2 feet. 
.wednesday...southeast winds 5 to 15 knots backing east late.
waves calm to 2 feet. 
.wednesday night...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. 
.thursday...south winds 5 to 15 knots. 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...south winds 5 to 15 knots backing northeast by mid
afternoon. waves calm to 2 feet. 
.friday night...east winds 5 to 15 knots veering south after
midnight. waves calm to 2 feet. 
.saturday...southeast winds 5 to 15 knots becoming south 10 to
20 knots. a chance of showers. waves building to 1 to 3 feet. 
.sunday...southwest winds 10 to 20 knots becoming west 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$