fzus63 kmqt 132001
glfls 
expires:202510140800;;079674

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon oct 13 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 30.5 inch high builds over the canadian prairie into tuesday, 
increasing ridging over lake superior. this high shifts east to the 
great lakes and northern ontario by wednesday at around 30.3 inches. 
ridging weakens to 30.0 inches over lake superior through thursday 
as troughing develops over the plains and the parent high moves 
east. thursday night through friday, a 29.4 inch low develops over 
the northern plains and lifts near to lake winnipeg. this low is 
projected to bring 29.5 to 29.6 inch troughing over lake superior 
this weekend as the low traverses northern ontario.



lsz162-140800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt mon oct 13 2025 /301 pm cdt mon oct 13 2025/

.late this afternoon...west winds 15 to 25 knots. waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet. 
.tonight...west winds 10 to 20 knots veering north late. waves
subsiding to calm to 2 feet. 
.tuesday...north winds 5 to 15 knots backing southwest late.
waves calm to 2 feet. 
.tuesday night...southwest winds 5 to 15 knots backing east after
midnight. a slight chance of showers through midnight. waves calm
to 2 feet. 
.wednesday...east winds 5 to 15 knots. waves calm to 2 feet. 
.wednesday night...east winds 5 to 15 knots veering southeast
after midnight. waves calm to 2 feet. 
.thursday...southeast winds 10 to 20 knots. showers. waves calm
to 2 feet. 
.thursday night...south winds 10 to 20 knots. showers likely.
waves calm to 2 feet. 
.friday...south winds 10 to 20 knots veering southwest. a chance
of showers. waves building to 1 to 3 feet. 
.saturday...southwest winds 15 to 25 knots veering west. a chance
of showers. waves building to 2 to 4 feet, then subsiding to calm
to 2 feet. 

$$

fzus63 kmqt 132001
glfls 
expires:202510140800;;079675

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon oct 13 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 30.5 inch high builds over the canadian prairie into tuesday, 
increasing ridging over lake superior. this high shifts east to the 
great lakes and northern ontario by wednesday at around 30.3 inches. 
ridging weakens to 30.0 inches over lake superior through thursday 
as troughing develops over the plains and the parent high moves 
east. thursday night through friday, a 29.4 inch low develops over 
the northern plains and lifts near to lake winnipeg. this low is 
projected to bring 29.5 to 29.6 inch troughing over lake superior 
this weekend as the low traverses northern ontario.



lsz263-140800-
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 edt mon oct 13 2025

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

$$