fzus63 kmqt 250801
glfls 
expires:202608252000;;324360

open lake forecast for lake superior
national weather service marquette mi
400 am edt tue aug 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...

30.1 inch high pressure over the western great lakes this morning 
shifts east into the lower great lakes by tonight. meanwhile, a 29.7 
inch clipper low over manitoba moves into western ontario this 
afternoon. this clipper moves over lake superior tonight and 
wednesday morning before lifting away towards james bay and northern 
quebec wednesday night into thursday morning. 30.1 inch high 
pressure ridging returns to lake superior by thursday afternoon, 
building to 30.2 inches over the lake by friday before shifting into 
the lower great lakes by saturday morning. 




lsz162-252000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt tue aug 25 2026 /300 am cdt tue aug 25 2026/

.early this morning...east winds less than 10 knots. waves calm
to 2 feet. 
.today...south winds 5 to 15 knots backing east in the afternoon.
a chance of showers and thunderstorms. waves calm to 2 feet. 
.tonight...east winds 5 to 15 knots veering west after midnight,
then increasing to 10 to 20 knots late. a chance of showers and
thunderstorms through midnight. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots veering northwest late.
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 backing south by mid
afternoon. waves calm to 2 feet. 
.thursday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.friday...east winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 

$$

fzus63 kmqt 250801
glfls 
expires:202608252000;;324361

open lake forecast for lake superior
national weather service marquette mi
400 am edt tue aug 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...

30.1 inch high pressure over the western great lakes this morning 
shifts east into the lower great lakes by tonight. meanwhile, a 29.7 
inch clipper low over manitoba moves into western ontario this 
afternoon. this clipper moves over lake superior tonight and 
wednesday morning before lifting away towards james bay and northern 
quebec wednesday night into thursday morning. 30.1 inch high 
pressure ridging returns to lake superior by thursday afternoon, 
building to 30.2 inches over the lake by friday before shifting into 
the lower great lakes by saturday morning. 




lsz263-252000-
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 am edt tue aug 25 2026

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

$$