fzus63 kmqt 302001
glfls 
expires:202608310800;;624701

open lake forecast for lake superior
national weather service marquette mi
401 pm edt sun aug 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 29.6 inch low over the northern plains this afternoon lifts into 
the canadian prairies tonight and deepens to 29.3 inches by monday 
morning. this will bring 29.8 inch troughing over lake superior 
tonight into monday, lingering through tuesday as the low crosses 
northern ontario at around 29.6 inches. ridging of around 29.9 
inches then returns to the lake on wednesday and strengthens to 30.0 
inches through friday. 




lsz162-310800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt sun aug 30 2026 /301 pm cdt sun aug 30 2026/

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

$$

fzus63 kmqt 302001
glfls 
expires:202608310800;;624702

open lake forecast for lake superior
national weather service marquette mi
401 pm edt sun aug 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 29.6 inch low over the northern plains this afternoon lifts into 
the canadian prairies tonight and deepens to 29.3 inches by monday 
morning. this will bring 29.8 inch troughing over lake superior 
tonight into monday, lingering through tuesday as the low crosses 
northern ontario at around 29.6 inches. ridging of around 29.9 
inches then returns to the lake on wednesday and strengthens to 30.0 
inches through friday. 




lsz263-310800-
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 sun aug 30 2026

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

$$