fzus63 kmqt 160801
glfls 
expires:202609162000;;535004

open lake forecast for lake superior
national weather service marquette mi
401 am edt wed sep 16 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, 30.3 inch high pressure west of lake superior builds 
to 30.4 inches as it moves over the lake. the high weakens to 30.3 
inches over quebec early thursday morning as 29.9 inch low pressure 
moves slong the western hudson bay shoreline. this will pass a weak 
30.2 inch trough over lake superior thursday. meanwhile, 30.4 inch 
high pressure develops over north dakota and manitoba. this high 
moves over northern ontario and lake superior by friday morning as 
the low pushes into quebec and another 29.9 inch low develops over 
south dakota and nebraska. the high weakens to 30.3 inches as it 
moves to the quebec/ontario line saturday morning as the low shifts 
to the upper mississippi valley. by sunday morning, another 30.3 
inch high will move over northwestern ontario as 29.9 inch low 
pressure extends across the southern great lakes basin. the high 
shifts to northeastern ontario monday morning.





lsz263-162000-
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 am edt wed sep 16 2026

.early this morning...northwest winds 5 to 15 knots. waves 1 to
3 feet subsiding to calm to 2 feet. 
.today...north winds 5 to 15 knots becoming northeast less than
10 knots in the afternoon, then becoming east 5 to 15 knots late.
waves calm to 2 feet. 
.tonight...east winds 5 to 15 knots veering southeast after
midnight, then veering southwest late. a slight chance of
showers. waves calm to 2 feet. 
.thursday...west winds 5 to 15 knots. waves calm to 2 feet. 
.thursday night...north winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. waves building to 1 to 3 feet. 
.friday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves 1 to 3 feet. 
.friday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.saturday...east winds 15 to 25 knots becoming northeast 10 to
20 knots. waves calm to 2 feet. 
.sunday...northeast winds 20 to 30 knots veering east. waves
building to 2 to 4 feet, then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 160801
glfls 
expires:202609162000;;535003

open lake forecast for lake superior
national weather service marquette mi
401 am edt wed sep 16 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, 30.3 inch high pressure west of lake superior builds 
to 30.4 inches as it moves over the lake. the high weakens to 30.3 
inches over quebec early thursday morning as 29.9 inch low pressure 
moves slong the western hudson bay shoreline. this will pass a weak 
30.2 inch trough over lake superior thursday. meanwhile, 30.4 inch 
high pressure develops over north dakota and manitoba. this high 
moves over northern ontario and lake superior by friday morning as 
the low pushes into quebec and another 29.9 inch low develops over 
south dakota and nebraska. the high weakens to 30.3 inches as it 
moves to the quebec/ontario line saturday morning as the low shifts 
to the upper mississippi valley. by sunday morning, another 30.3 
inch high will move over northwestern ontario as 29.9 inch low 
pressure extends across the southern great lakes basin. the high 
shifts to northeastern ontario monday morning.





lsz162-162000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt wed sep 16 2026 /301 am cdt wed sep 16 2026/

.early this morning...north winds 5 to 15 knots. waves calm to
2 feet. 
.today...northeast winds 5 to 15 knots veering east in the
afternoon. a slight chance of showers by mid afternoon. waves
calm to 2 feet. 
.tonight...northeast winds 5 to 15 knots backing northwest late.
a slight chance of showers. waves calm to 2 feet. 
.thursday...west winds 5 to 15 knots. waves calm to 2 feet. 
.thursday night...north winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. waves calm to 2 feet. 
.friday...east winds 15 to 25 knots. a chance of showers. waves
building to 1 to 3 feet. 
.friday night...east winds 15 to 25 knots. waves building to 2 to
4 feet. 
.saturday...northeast winds 20 to 30 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet. 
.sunday...northeast gales to 35 knots becoming east 20 to
30 knots. waves building to 2 to 4 feet, then subsiding to 1 to
3 feet. 

$$