fzus63 kmqt 120901
glfls 
expires:202511122100;;277457

open lake forecast for lake superior
national weather service marquette mi
401 am est wed nov 12 2025

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 29.5 inch trough over lake superior early this morning departs 
into eastern ontario throughout the morning as a 29.4 inch low moves 
over hudson bay. by tonight, the lake will be between 30.1 inch 
ridging over the midwest and a deep 28.4 inch low over labrador. 
ridging builds to 30.0 inches over the lake thursday night ahead of 
a 29.4 inch trough moving out of the northern rockies. this trough 
looks to move across lake superior at around 29.4 inches on 
saturday. by the end of the weekend, lake superior will be between 
low pressure of near 29.0 inches over the canadian maritimes and 
high pressure of near 30.1 inches over the great plains.



lsz162-122100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am est wed nov 12 2025 /301 am cst wed nov 12 2025/

.early this morning...west winds 20 to 30 knots. waves 4 to
7 feet occasionally to 9 feet. 
.today...west winds 20 to 30 knots increasing to 30 knots with a
few gale force gusts to 35 knots possible by late morning, then
diminishing to 20 to 30 knots by mid afternoon. waves subsiding
to 3 to 6 feet occasionally to 8 feet. 
.tonight...northwest winds 20 to 30 knots becoming west 15 to
25 knots by midnight. waves subsiding to 3 to 5 feet occasionally
to 7 feet. 
.thursday...west winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to 1 to 3 feet. 
.thursday night...west winds 5 to 15 knots backing east after
midnight. waves subsiding to calm to 2 feet. 
.friday...southeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. waves calm to 2 feet. 
.friday night...south winds 10 to 20 knots. waves building to
1 to 3 feet. 
.saturday...west winds 15 to 25 knots becoming northwest 20 to
30 knots. a chance of rain showers. waves subsiding to calm to
2 feet, then building to 3 to 6 feet occasionally to 8 feet. 
.sunday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 120901
glfls 
expires:202511122100;;277458

open lake forecast for lake superior
national weather service marquette mi
401 am est wed nov 12 2025

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 29.5 inch trough over lake superior early this morning departs 
into eastern ontario throughout the morning as a 29.4 inch low moves 
over hudson bay. by tonight, the lake will be between 30.1 inch 
ridging over the midwest and a deep 28.4 inch low over labrador. 
ridging builds to 30.0 inches over the lake thursday night ahead of 
a 29.4 inch trough moving out of the northern rockies. this trough 
looks to move across lake superior at around 29.4 inches on 
saturday. by the end of the weekend, lake superior will be between 
low pressure of near 29.0 inches over the canadian maritimes and 
high pressure of near 30.1 inches over the great plains.



lsz263-122100-
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 am est wed nov 12 2025

...gale warning in effect through this evening...

.early this morning...northwest gales to 35 knots. waves 6 to
9 feet occasionally to 11 feet building to 7 to 10 feet
occasionally to 13 feet. 
.today...northwest gales to 35 knots. waves subsiding to 6 to
9 feet occasionally to 11 feet, then building to 7 to 10 feet
occasionally to 13 feet. 
.tonight...northwest winds 20 to 30 knots becoming west 15 to
25 knots late. waves subsiding to 3 to 6 feet occasionally to
8 feet, then building to 4 to 7 feet occasionally to 9 feet. 
.thursday...west winds 20 to 30 knots. waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.thursday night...northwest winds 10 to 20 knots becoming east
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.friday...southeast winds 10 to 20 knots. waves building to 2 to
4 feet. 
.friday night...south winds 10 to 20 knots. waves 2 to 4 feet. 
.saturday...west winds 20 to 30 knots veering northwest. a chance
of rain showers. waves building to 5 to 8 feet occasionally to
10 feet. 
.sunday...northwest winds 20 to 30 knots. waves building to 6 to
9 feet occasionally to 11 feet, then subsiding to 2 to 4 feet. 

$$