fzus63 kmqt 210201
glfls 
expires:202510210800;;483464

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt mon oct 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 29.5 inch low over the minnesota arrowhead moves over lake 
superior tonight. another low looks to develop over eastern upper 
michigan tuesday morning, deepen over eastern lake superior to 29.3 
inches for the afternoon and evening, then drop southeast over lower 
michigan tuesday night and wednesday morning. the low then moves 
eastward to southern ontario by wednesday evening. ridging builds in 
from west to east beginning thursday, gradually building to 30.3 
inches by saturday.



lsz162-210800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt mon oct 20 2025 /901 pm cdt mon oct 20 2025/

.rest of tonight...south winds 15 to 25 knots becoming west 20 to
30 knots after midnight, then diminishing to 15 to 25 knots late.
a chance of showers. waves 3 to 6 feet occasionally to 8 feet. 
.tuesday...west winds 15 to 25 knots veering northwest in the
afternoon, then becoming north 20 to 30 knots late. a chance of
showers through early afternoon, then showers by mid afternoon.
waves subsiding to 2 to 4 feet, then building to 4 to 7 feet
occasionally to 9 feet. 
.tuesday night...north winds 20 to 30 knots. showers. waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet. 
.wednesday...northwest winds 20 to 30 knots. showers. waves
subsiding to 2 to 4 feet. 
.wednesday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. a chance of rain showers. waves
subsiding to 1 to 3 feet. 
.thursday...northwest winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 
.thursday night...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.friday...south winds 5 to 15 knots backing southeast. waves calm
to 2 feet. 
.saturday...southeast winds 5 to 15 knots increasing to 10 to
20 knots. waves building to 1 to 3 feet. 

$$

fzus63 kmqt 210201
glfls 
expires:202510210800;;483465

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt mon oct 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 29.5 inch low over the minnesota arrowhead moves over lake 
superior tonight. another low looks to develop over eastern upper 
michigan tuesday morning, deepen over eastern lake superior to 29.3 
inches for the afternoon and evening, then drop southeast over lower 
michigan tuesday night and wednesday morning. the low then moves 
eastward to southern ontario by wednesday evening. ridging builds in 
from west to east beginning thursday, gradually building to 30.3 
inches by saturday.



lsz263-210800-
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 mon oct 20 2025

...gale watch in effect from tuesday afternoon through wednesday
morning...

.rest of tonight...southeast winds 15 to 25 knots veering south
after midnight, then veering west late. showers by midnight, then
a chance of showers after midnight. waves 4 to 7 feet
occasionally to 9 feet subsiding to 3 to 6 feet occasionally to
8 feet. 
.tuesday...west winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon, then veering north late. a chance of showers
through early afternoon, then showers by mid afternoon. waves
building to 7 to 10 feet occasionally to 13 feet. 
.tuesday night...north gales to 35 knots. rain showers. waves
building to 7 to 11 feet occasionally to 14 feet. 
.wednesday...north gales to 35 knots becoming northwest 20 to
30 knots by mid afternoon. rain showers. waves subsiding to 3 to
6 feet occasionally to 8 feet. 
.wednesday night...north winds 20 to 30 knots backing northwest
after midnight. a chance of rain showers. waves 3 to 6 feet
occasionally to 8 feet. 
.thursday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. waves subsiding to 2 to 4 feet. 
.thursday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.friday...northwest winds 5 to 15 knots backing south. waves calm
to 2 feet. 
.saturday...southeast winds 5 to 15 knots becoming south 10 to
20 knots. waves building to 1 to 3 feet. 

$$