fzus63 kmqt 180901
glfls 
expires:202511182100;;609741

open lake forecast for lake superior
national weather service marquette mi
401 am est tue nov 18 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...

high pressure averaging 30.1 inches persists over lake superior 
today as a 28.8 inch low retrogrades back into far northern quebec. 
30.2 inch ridging continues to encompass the great lakes basin 
wednesday, shifting into new england wednesday night and thursday as 
a 29.7 inch low develops over northern ontario. high pressure 
ridging of around 30.1 inches develops over the northern plains and 
upper midwest on friday before moving into the great lakes region by 
saturday.



lsz162-182100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am est tue nov 18 2025 /301 am cst tue nov 18 2025/

.early this morning...northeast winds 5 to 15 knots. waves calm
to 2 feet. 
.today...east winds 5 to 15 knots diminishing to less than
10 knots by mid afternoon. waves calm to 2 feet. 
.tonight...southwest winds less than 10 knots increasing to 5 to
15 knots by midnight. waves calm to 2 feet. 
.wednesday...southwest winds 10 to 20 knots. waves calm to
2 feet. 
.wednesday night...southwest winds 10 to 20 knots. a chance of
rain showers in the evening, then rain showers likely after
midnight. waves building to 1 to 3 feet. 
.thursday...west winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. rain showers likely in the morning.
waves 1 to 3 feet. 
.thursday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves 1 to 3 feet. 
.friday...northwest winds 10 to 20 knots becoming west 5 to
15 knots. waves subsiding to calm to 2 feet. 
.saturday...southwest winds 10 to 20 knots veering west. waves
calm to 2 feet. 

$$

fzus63 kmqt 180901
glfls 
expires:202511182100;;609742

open lake forecast for lake superior
national weather service marquette mi
401 am est tue nov 18 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...

high pressure averaging 30.1 inches persists over lake superior 
today as a 28.8 inch low retrogrades back into far northern quebec. 
30.2 inch ridging continues to encompass the great lakes basin 
wednesday, shifting into new england wednesday night and thursday as 
a 29.7 inch low develops over northern ontario. high pressure 
ridging of around 30.1 inches develops over the northern plains and 
upper midwest on friday before moving into the great lakes region by 
saturday.



lsz263-182100-
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 tue nov 18 2025

.early this morning...northeast winds 5 to 15 knots. waves calm
to 2 feet. 
.today...northeast winds less than 10 knots backing northwest by
mid afternoon. waves calm to 2 feet. 
.tonight...west winds less than 10 knots increasing to 5 to
15 knots by midnight, then backing southwest late. waves calm to
2 feet. 
.wednesday...southwest winds 5 to 15 knots increasing to 10 to
20 knots. waves building to 1 to 3 feet. 
.wednesday night...southwest winds 15 to 25 knots. a chance of
rain showers. waves building to 2 to 4 feet. 
.thursday...west winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. rain showers likely in the morning,
then a chance of rain showers in the afternoon. waves building to
3 to 6 feet occasionally to 8 feet. 
.thursday night...west winds 15 to 25 knots. waves subsiding to
3 to 6 feet occasionally to 8 feet. 
.friday...northwest winds 15 to 25 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 
.saturday...southwest winds 10 to 20 knots veering west. waves
building to 1 to 3 feet. 

$$