fzus63 kmqt 232001
glfls 
expires:202608240800;;241612

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun aug 23 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...

this afternoon, a 29.6 inch low is along the quebec/ontario line 
while 30.0 inch high pressure extends from hudson bay to missouri. 
little movement is expected with only a slight weakening of both 
pressure centers through tonight. by monday night, the low weakens 
to 29.8 inches as it fully moves into quebec, allowing the high to 
also weaken to 30.0 inches and settle over the upper great lakes. 
meanwhile, 29.8 inch low pressure moves over lake winnipeg. these 
systems all shift east slowly through wednesday afternoon, when the 
weak high moves over new england as the 29.7 inch low moves over 
lake superior. by thursday afternoon, the low will deepen to 29.6 
inches over western quebec as a 30.2 inch high moves over northern 
manitoba. this high will extend 30.1 inch ridging over lake superior 
friday into the weekend. 




lsz162-240800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt sun aug 23 2026 /300 pm cdt sun aug 23 2026/

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

$$

fzus63 kmqt 232001
glfls 
expires:202608240800;;241613

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun aug 23 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...

this afternoon, a 29.6 inch low is along the quebec/ontario line 
while 30.0 inch high pressure extends from hudson bay to missouri. 
little movement is expected with only a slight weakening of both 
pressure centers through tonight. by monday night, the low weakens 
to 29.8 inches as it fully moves into quebec, allowing the high to 
also weaken to 30.0 inches and settle over the upper great lakes. 
meanwhile, 29.8 inch low pressure moves over lake winnipeg. these 
systems all shift east slowly through wednesday afternoon, when the 
weak high moves over new england as the 29.7 inch low moves over 
lake superior. by thursday afternoon, the low will deepen to 29.6 
inches over western quebec as a 30.2 inch high moves over northern 
manitoba. this high will extend 30.1 inch ridging over lake superior 
friday into the weekend. 




lsz263-240800-
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-
400 pm edt sun aug 23 2026

.late this afternoon...west winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.monday...north winds 5 to 15 knots backing southwest late. waves
calm to 2 feet. 
.monday night...southwest winds 5 to 15 knots backing south late.
waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots backing southeast by mid
afternoon. showers likely and a chance of thunderstorms by mid
afternoon. waves calm to 2 feet. 
.tuesday night...southeast winds 5 to 15 knots veering southwest
after midnight. showers and a chance of thunderstorms. waves calm
to 2 feet. 
.wednesday...west winds 10 to 20 knots. a chance of showers.
waves calm to 2 feet. 
.wednesday night...northwest winds 10 to 20 knots. waves calm to
2 feet. 
.thursday...northwest winds 10 to 20 knots becoming north 5 to
15 knots. waves calm to 2 feet. 
.friday...north winds 5 to 15 knots veering south. waves calm to
2 feet. 

$$