fzus63 kmqt 122001
glfls 
expires:202609130800;;342955

open lake forecast for lake superior
national weather service marquette mi
401 pm edt sat sep 12 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 cold front and 29.7 inch trough continue to shift east of the lake 
this evening. 30.0 inch ridging builds back in from the northern 
plains on sunday and strengthens to 30.2 inches on monday. a low 
averaging 29.4 inches crosses northern ontario on tuesday, with a 
strong 30.4 inch high building across lake superior on wednesday.




lsz162-130800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt sat sep 12 2026 /301 pm cdt sat sep 12 2026/

.late this afternoon...west winds 15 to 25 knots. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tonight...west winds 15 to 25 knots diminishing to 10 to
20 knots late. waves 1 to 3 feet. 
.sunday...west winds 15 to 25 knots becoming northwest 10 to
20 knots late. waves subsiding to calm to 2 feet. 
.sunday night...northwest winds 5 to 15 knots diminishing to less
than 10 knots late. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots becoming southeast 15 to
25 knots by mid afternoon. showers likely by mid afternoon. waves
calm to 2 feet. 
.monday night...southeast gales to 35 knots veering southwest
after midnight. showers through midnight. waves building to 4 to
7 feet occasionally to 9 feet. 
.tuesday...west gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. waves subsiding to 2 to 4 feet. 
.tuesday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...east winds 5 to 15 knots. waves calm to 2 feet. 
.thursday...west winds 5 to 15 knots veering northeast. waves
calm to 2 feet. 

$$

fzus63 kmqt 122001
glfls 
expires:202609130800;;342956

open lake forecast for lake superior
national weather service marquette mi
401 pm edt sat sep 12 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 cold front and 29.7 inch trough continue to shift east of the lake 
this evening. 30.0 inch ridging builds back in from the northern 
plains on sunday and strengthens to 30.2 inches on monday. a low 
averaging 29.4 inches crosses northern ontario on tuesday, with a 
strong 30.4 inch high building across lake superior on wednesday.




lsz263-130800-
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 sat sep 12 2026

.late this afternoon...west winds 20 to 30 knots. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...west winds 15 to 25 knots veering northwest after
midnight. waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.sunday...northwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet. 
.sunday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing west late. waves
subsiding to calm to 2 feet. 
.monday...south winds 15 to 25 knots becoming southeast 20 to
30 knots by mid afternoon. a chance of showers by mid afternoon.
waves calm to 2 feet. 
.monday night...south gales to 35 knots veering southwest after
midnight. showers through midnight, then a chance of showers
after midnight. waves building to 4 to 8 feet occasionally to
10 feet. 
.tuesday...west gales to 40 knots. waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet. 
.tuesday night...northwest winds 20 to 30 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...east winds 5 to 15 knots veering south. waves calm
to 2 feet. 
.thursday...west winds 10 to 20 knots. waves calm to 2 feet. 

$$