fzus63 kmqt 252001
glfls 
expires:202605260800;;639703

open lake forecast for lake superior
national weather service marquette mi
400 pm edt mon may 25 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 29.6 inch low over northern ontario drags a 29.8 inch trough over 
lake superior tonight. by tuesday night, a 30.4 inch high over the 
western shores of hudson bay extends weak ridging over lake 
superior. the parent high shifts south into lake superior on 
thursday at 30.4 inches still. on friday, the high weakens to around 
30.1 inches as it continues south towards chicago. however, another 
high pressure ridge pushing in from hudson bay brings 30.1 inch 
ridging back over lake superior late on friday, with the ridging 
increasing once again to 30.3 inches by saturday as the parent high 
over hudson bay pushes south.



lsz162-260800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt mon may 25 2026 /301 pm cdt mon may 25 2026/

.late this afternoon...east winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...south winds 10 to 20 knots becoming southwest 5 to
15 knots after midnight, then veering west late. a slight chance
of showers and thunderstorms through midnight. waves calm to
2 feet. 
.tuesday...north winds 5 to 15 knots veering northeast in the
afternoon. waves calm to 2 feet. 
.tuesday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.wednesday...northeast winds 10 to 20 knots. waves building to
2 to 4 feet. 
.wednesday night...northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots. waves calm to 2 feet. 
.thursday night...north winds less than 10 knots becoming west
5 to 15 knots after midnight. waves calm to 2 feet. 
.friday...south winds 5 to 15 knots backing northeast. waves calm
to 2 feet. 
.saturday...northeast winds 10 to 20 knots. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 252001
glfls 
expires:202605260800;;639704

open lake forecast for lake superior
national weather service marquette mi
400 pm edt mon may 25 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 29.6 inch low over northern ontario drags a 29.8 inch trough over 
lake superior tonight. by tuesday night, a 30.4 inch high over the 
western shores of hudson bay extends weak ridging over lake 
superior. the parent high shifts south into lake superior on 
thursday at 30.4 inches still. on friday, the high weakens to around 
30.1 inches as it continues south towards chicago. however, another 
high pressure ridge pushing in from hudson bay brings 30.1 inch 
ridging back over lake superior late on friday, with the ridging 
increasing once again to 30.3 inches by saturday as the parent high 
over hudson bay pushes south.



lsz263-260800-
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 may 25 2026

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

$$