fzus63 kmqt 231401
glfls 
expires:202608232000;;226649

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 morning, a 29.7 inch low is along the quebec/ontario line while 
30.1 inch high pressure extends from northwestern ontario to iowa. 
little movement is expected with only a slight weakening of both 
pressure centers through today and 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. 




lsz162-232000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt sun aug 23 2026 /900 am cdt sun aug 23 2026/

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

$$

fzus63 kmqt 231401
glfls 
expires:202608232000;;226650

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 morning, a 29.7 inch low is along the quebec/ontario line while 
30.1 inch high pressure extends from northwestern ontario to iowa. 
little movement is expected with only a slight weakening of both 
pressure centers through today and 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. 




lsz263-232000-
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-
1000 am edt sun aug 23 2026

.rest of today...north winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing west late. waves 1 to
3 feet subsiding to calm to 2 feet. 
.tonight...west winds 5 to 15 knots veering north late. waves
calm to 2 feet. 
.monday...north winds 5 to 15 knots backing northwest in the
afternoon, then backing southwest late. waves calm to 2 feet. 
.monday night...southwest winds 5 to 15 knots backing south 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,
then showers likely and a slight chance of thunderstorms by mid
afternoon. waves calm to 2 feet. 
.tuesday night...southeast winds 5 to 15 knots veering south
after midnight. showers and a chance of thunderstorms. waves calm
to 2 feet. 
.wednesday...west winds 10 to 20 knots veering northwest. a
chance of showers. waves calm to 2 feet. 
.thursday...northwest winds 10 to 20 knots becoming north 5 to
15 knots. waves calm to 2 feet. 

$$