fzus63 kmqt 300801
glfls 
expires:202609302000;;289484

open lake forecast for lake superior
national weather service marquette mi
401 am edt wed sep 30 2026

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 29.2 inch low over northern manitoba this morning deepens to 29.0 
inches over hudson bay this afternoon, sending a 29.7 inch trough 
over lake superior today. 29.8 inch troughing lingers over the lake 
through thursday morning between the canadian low and another 29.7 
low over the south plains. high pressure builds to 30.3 inches over 
the northern plains thursday night into friday before shifting east 
to the great lakes friday night and saturday. a weak 29.9 inch 
trough crosses lake superior saturday night and sunday, with 30.3 
inch high pressure quickly returning sunday night into monday. 




lsz162-302000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt wed sep 30 2026 /301 am cdt wed sep 30 2026/

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

$$

fzus63 kmqt 300801
glfls 
expires:202609302000;;289485

open lake forecast for lake superior
national weather service marquette mi
401 am edt wed sep 30 2026

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 29.2 inch low over northern manitoba this morning deepens to 29.0 
inches over hudson bay this afternoon, sending a 29.7 inch trough 
over lake superior today. 29.8 inch troughing lingers over the lake 
through thursday morning between the canadian low and another 29.7 
low over the south plains. high pressure builds to 30.3 inches over 
the northern plains thursday night into friday before shifting east 
to the great lakes friday night and saturday. a weak 29.9 inch 
trough crosses lake superior saturday night and sunday, with 30.3 
inch high pressure quickly returning sunday night into monday. 




lsz263-302000-
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 edt wed sep 30 2026

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

$$