fzus63 kmqt 012001
glfls 
expires:202610020800;;372458

open lake forecast for lake superior
national weather service marquette mi
401 pm edt thu oct 1 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...

troughing of 29.9 inches lingers over eastern lake superior between 
29.3 troughing over northeastern quebec and a 29.8 inch low over the 
south plains. high pressure builds to 30.2 inches over the northern 
plains tonight into friday before shifting east to the great lakes 
friday night through saturday and building to 30.3 inches. 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. ridging remains in the area through tuesday afternoon before 
being replaced by troughing wednesday morning.




lsz162-020800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt thu oct 1 2026 /301 pm cdt thu oct 1 2026/

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

$$

fzus63 kmqt 012001
glfls 
expires:202610020800;;372459

open lake forecast for lake superior
national weather service marquette mi
401 pm edt thu oct 1 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...

troughing of 29.9 inches lingers over eastern lake superior between 
29.3 troughing over northeastern quebec and a 29.8 inch low over the 
south plains. high pressure builds to 30.2 inches over the northern 
plains tonight into friday before shifting east to the great lakes 
friday night through saturday and building to 30.3 inches. 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. ridging remains in the area through tuesday afternoon before 
being replaced by troughing wednesday morning.




lsz263-020800-
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 thu oct 1 2026

.late this afternoon...west winds 15 to 25 knots. waves 2 to
4 feet. 
.tonight...northwest winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet. 
.friday...northwest winds 10 to 20 knots becoming west 5 to
15 knots late. waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 1 to 3 feet. 
.friday night...west winds 5 to 15 knots backing south late.
waves subsiding to calm to 2 feet. 
.saturday...south winds 10 to 20 knots. a slight chance of
showers. waves building to 1 to 3 feet, then subsiding to calm to
2 feet. 
.saturday night...south winds 15 to 25 knots becoming west 20 to
30 knots after midnight. a chance of showers. waves building to
3 to 6 feet occasionally to 8 feet. 
.sunday...northwest winds 20 to 30 knots. waves subsiding to 2 to
4 feet. 
.sunday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 1 to 3 feet. 
.monday...northwest winds 10 to 20 knots backing south. waves
subsiding to calm to 2 feet, then building to 2 to 4 feet. 
.tuesday...south gales to 35 knots becoming southwest 20 to
30 knots. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet. 

$$