fzus63 kmqt 150901
glfls 
expires:202511152100;;441379

open lake forecast for lake superior
national weather service marquette mi
401 am est sat nov 15 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 29.4 inch trough extends over lake superior this morning from a 
29.2 inch low moving towards hudson bay. the trough exits into 
eastern ontario this evening and develops into a 29.1 inch low over 
new england by sunday morning, further deepening to 28.8 inches over 
the canadian maritimes sunday night into monday. troughing gradually 
weakens to 29.9 inches over lake superior through sunday night as 
this occurs. meanwhile, 30.1 inch high pressure extending from 
saskatchewan to the dakotas this weekend builds to 30.3 inches as it 
shifts east to the great lakes by tuesday night. high pressure 
persists at around 30.2 inches over the lake through late next week 
as the high shifts east to new england by thursday night.



lsz162-152100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am est sat nov 15 2025 /301 am cst sat nov 15 2025/

.early this morning...west winds 10 to 20 knots. a slight chance
of showers. waves calm to 2 feet. 
.today...west winds 15 to 25 knots increasing to 20 to 30 knots
by late morning, then veering northwest by mid afternoon. a
slight chance of rain showers in the morning. waves building to
3 to 6 feet occasionally to 8 feet. 
.tonight...northwest winds 20 to 30 knots. waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.sunday...northwest winds 15 to 25 knots. waves subsiding to 2 to
4 feet. 
.sunday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.monday...northwest winds 5 to 15 knots. waves calm to 2 feet. 
.monday night...north winds 5 to 15 knots veering northeast after
midnight. waves calm to 2 feet. 
.tuesday...east winds 5 to 15 knots veering south. waves calm to
2 feet. 
.wednesday...south winds 5 to 15 knots veering southwest. waves
calm to 2 feet. 

$$

fzus63 kmqt 150901
glfls 
expires:202511152100;;441380

open lake forecast for lake superior
national weather service marquette mi
401 am est sat nov 15 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 29.4 inch trough extends over lake superior this morning from a 
29.2 inch low moving towards hudson bay. the trough exits into 
eastern ontario this evening and develops into a 29.1 inch low over 
new england by sunday morning, further deepening to 28.8 inches over 
the canadian maritimes sunday night into monday. troughing gradually 
weakens to 29.9 inches over lake superior through sunday night as 
this occurs. meanwhile, 30.1 inch high pressure extending from 
saskatchewan to the dakotas this weekend builds to 30.3 inches as it 
shifts east to the great lakes by tuesday night. high pressure 
persists at around 30.2 inches over the lake through late next week 
as the high shifts east to new england by thursday night.



lsz263-152100-
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 sat nov 15 2025

.early this morning...west winds 5 to 15 knots. a chance of
showers. waves 1 to 3 feet. 
.today...northwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. a chance of rain showers in the
morning. waves building to 5 to 8 feet occasionally to 10 feet. 
.tonight...northwest winds 20 to 30 knots. waves subsiding to
4 to 7 feet occasionally to 9 feet. 
.sunday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.sunday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 2 to 4 feet. 
.monday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. waves subsiding to calm to 2 feet. 
.monday night...north winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...northeast winds 5 to 15 knots veering south. waves
calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots. waves calm to 2 feet.

$$