fzus63 kmqt 130801
glfls 
expires:202608132000;;105083

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu aug 13 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...

weak 29.9 inch ridging over lake superior holds through this morning 
as a 30.2 inch high is developing over the canadian rockies. this 
high eventually becomes centered over the lake at 30.2 inches friday 
afternoon. a 29.9 inch trough then moves over the western end of the 
lake saturday afternoon as the 30.2 inch high moves over the lower 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching the ontario/quebec line by 
sunday evening. sunday night into monday, a 30.1 inch high over the 
plains will weaken to 30.0 inches as it slides south of lake 
superior. by tuesday, this high will be fully south of the great 
lakes as a 29.4 inch low over hudson bay extends a 29.8 inch trough 
over lake superior.




lsz162-132000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt thu aug 13 2026 /301 am cdt thu aug 13 2026/

.early this morning...north winds 5 to 15 knots. patchy fog.
waves calm to 2 feet. 
.today...northeast winds 5 to 15 knots veering east late. a
slight chance of showers through early afternoon. waves calm to
2 feet. 
.tonight...northeast winds 5 to 15 knots. waves calm to 2 feet. 
.friday...northeast winds 5 to 15 knots increasing to 15 to
25 knots in the afternoon. waves building to 2 to 4 feet. 
.friday night...northeast winds 15 to 25 knots becoming east 5 to
15 knots after midnight. a chance of showers after midnight.
waves subsiding to calm to 2 feet. 
.saturday...east winds 10 to 20 knots backing northeast by mid
afternoon. a chance of showers. waves calm to 2 feet. 
.saturday night...north winds 5 to 15 knots backing northwest
after midnight. waves calm to 2 feet. 
.sunday...west winds 5 to 15 knots. waves calm to 2 feet. 
.monday...southwest winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 

$$

fzus63 kmqt 130801
glfls 
expires:202608132000;;105084

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu aug 13 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...

weak 29.9 inch ridging over lake superior holds through this morning 
as a 30.2 inch high is developing over the canadian rockies. this 
high eventually becomes centered over the lake at 30.2 inches friday 
afternoon. a 29.9 inch trough then moves over the western end of the 
lake saturday afternoon as the 30.2 inch high moves over the lower 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching the ontario/quebec line by 
sunday evening. sunday night into monday, a 30.1 inch high over the 
plains will weaken to 30.0 inches as it slides south of lake 
superior. by tuesday, this high will be fully south of the great 
lakes as a 29.4 inch low over hudson bay extends a 29.8 inch trough 
over lake superior.




lsz263-132000-
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 aug 13 2026

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

$$