fzus63 kmqt 202101
glfls 
expires:202511210900;;214064

open lake forecast for lake superior
national weather service marquette mi
401 pm est thu nov 20 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 29.8 inch trough moves over lake superior today as a developing 
29.7 inch low over northern manitoba moves into hudson bay at 29.5 
inches tonight. a 30.1 inch ridge of high pressure over the northern 
plains and upper midwest on friday moves over the great lakes on 
saturday. another 29.8 inch trough then moves over lake superior 
saturday night into sunday before 30.1 inch high pressure rebuilds 
over the great lakes early next week.



lsz162-210900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm est thu nov 20 2025 /301 pm cst thu nov 20 2025/

.late this afternoon...west winds 15 to 25 knots. waves 2 to
4 feet. 
.tonight...west winds 15 to 25 knots. waves subsiding to 1 to
3 feet, then building to 3 to 5 feet occasionally to 7 feet. 
.friday...northwest winds 10 to 20 knots. waves subsiding to calm
to 2 feet. 
.friday night...northwest winds 5 to 15 knots backing southwest
late. waves calm to 2 feet. 
.saturday...south winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. a slight chance of rain showers in the
afternoon. waves calm to 2 feet. 
.saturday night...west winds 10 to 20 knots. waves calm to
2 feet. 
.sunday...west winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. waves calm to 2 feet. 
.sunday night...west winds 5 to 15 knots backing south after
midnight. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots backing southeast. a chance
of rain showers. waves calm to 2 feet. 
.tuesday...west winds 10 to 20 knots increasing to 20 to
30 knots. a chance of rain showers. a chance of snow showers.
waves building to 3 to 6 feet occasionally to 8 feet. 

$$

fzus63 kmqt 202101
glfls 
expires:202511210900;;214065

open lake forecast for lake superior
national weather service marquette mi
401 pm est thu nov 20 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 29.8 inch trough moves over lake superior today as a developing 
29.7 inch low over northern manitoba moves into hudson bay at 29.5 
inches tonight. a 30.1 inch ridge of high pressure over the northern 
plains and upper midwest on friday moves over the great lakes on 
saturday. another 29.8 inch trough then moves over lake superior 
saturday night into sunday before 30.1 inch high pressure rebuilds 
over the great lakes early next week.



lsz263-210900-
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 pm est thu nov 20 2025

.late this afternoon...west winds 15 to 25 knots. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...west winds 10 to 20 knots increasing to 15 to 25 knots
by midnight. waves subsiding to 3 to 5 feet occasionally to
7 feet, then building to 4 to 7 feet occasionally to 9 feet. 
.friday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to 1 to 3 feet. 
.friday night...northwest winds 5 to 15 knots becoming west less
than 10 knots late. waves subsiding to calm to 2 feet. 
.saturday...south winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. a chance of rain showers, possibly
mixed with snow in the afternoon. waves building to 1 to 3 feet. 
.saturday night...west winds 10 to 20 knots. waves building to
2 to 4 feet. 
.sunday...west winds 10 to 20 knots. waves subsiding to calm to
2 feet. 
.sunday night...west winds 5 to 15 knots backing south after
midnight. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots. a chance of rain showers.
waves calm to 2 feet. 
.tuesday...south winds 15 to 25 knots becoming west gales to
35 knots. a chance of rain showers. a chance of snow showers.
waves building to 6 to 9 feet occasionally to 11 feet. 

$$