fzus63 kmqt 170801
glfls 
expires:202609172000;;589904

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 17 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 29.8 inch low over the western hudson bay is 
extending weak 30.2 inch troughing over lake superior, which is 
flanked by 30.3 inch highs over quebec and southern manitoba 
respectively. throughout today, the low and assocated trough will 
push east and weaken while the western high will move over the 
ontario/manitoba line. this high builds to 30.4 inches over northern 
lake superior and northern ontario by friday morning as a 29.9 inch 
low develops over nebraska. by saturday, the high weakens to 30.3 
inches over quebec as the low extends over iowa. meanwhile, a 30.2 
inch high builds over the canadian prairie. throughout the weekend, 
the prairies high will build to 30.3 inches as it moves over 
northern ontario as the low passes south of the great lakes. the 
high builds to 30.4 inches monday and expands over western quebec 
before building to 30.5 inches over quebec tuesday.




lsz162-172000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt thu sep 17 2026 /301 am cdt thu sep 17 2026/

.early this morning...west winds 5 to 15 knots. waves calm to
2 feet. 
.today...west winds 5 to 15 knots backing southwest in the
afternoon. waves calm to 2 feet. 
.tonight...west winds 5 to 15 knots veering northeast after
midnight, then becoming east 10 to 20 knots late. waves building
to 1 to 3 feet. 
.friday...east winds 10 to 20 knots increasing to 15 to 25 knots
late. a slight chance of showers by mid afternoon. waves 1 to
3 feet. 
.friday night...east winds 10 to 20 knots. a chance of showers.
waves 1 to 3 feet. 
.saturday...east winds 15 to 25 knots backing northeast by mid
afternoon. waves building to 2 to 4 feet, then subsiding to calm
to 2 feet. 
.saturday night...northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.sunday...northeast gales to 35 knots becoming east 20 to
30 knots. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet. 
.monday...east winds 20 to 30 knots diminishing to 15 to
25 knots. waves subsiding to calm to 2 feet, then building to
2 to 4 feet. 

$$

fzus63 kmqt 170801
glfls 
expires:202609172000;;589905

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu sep 17 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 29.8 inch low over the western hudson bay is 
extending weak 30.2 inch troughing over lake superior, which is 
flanked by 30.3 inch highs over quebec and southern manitoba 
respectively. throughout today, the low and assocated trough will 
push east and weaken while the western high will move over the 
ontario/manitoba line. this high builds to 30.4 inches over northern 
lake superior and northern ontario by friday morning as a 29.9 inch 
low develops over nebraska. by saturday, the high weakens to 30.3 
inches over quebec as the low extends over iowa. meanwhile, a 30.2 
inch high builds over the canadian prairie. throughout the weekend, 
the prairies high will build to 30.3 inches as it moves over 
northern ontario as the low passes south of the great lakes. the 
high builds to 30.4 inches monday and expands over western quebec 
before building to 30.5 inches over quebec tuesday.




lsz263-172000-
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 thu sep 17 2026

.early this morning...southwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...west winds 5 to 15 knots. waves calm to 2 feet. 
.tonight...west winds 5 to 15 knots veering northeast after
midnight, then veering east late. waves building to 1 to 3 feet. 
.friday...east winds 5 to 15 knots increasing to 10 to 20 knots
late. a slight chance of showers by mid afternoon. waves
subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.friday night...east winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. a chance of showers. waves subsiding to
calm to 2 feet. 
.saturday...east winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.saturday night...northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.sunday...northeast winds 20 to 30 knots veering east. waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
calm to 2 feet. 
.monday...east winds 15 to 25 knots veering southeast. waves
building to 1 to 3 feet, then subsiding to calm to 2 feet. 

$$