fzus63 kmqt 140201
glfls 
expires:202608140800;;148132

open lake forecast for lake superior
national weather service marquette mi
1001 pm 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...

this evening, 30.0 inch ridging is extending over the lake from a 
30.2 inch high 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 overnight 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 afternoon. 
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 29.5 
inch low over hudson bay extends a 29.9 inch trough over lake 
superior.




lsz162-140800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt thu aug 13 2026 /901 pm cdt thu aug 13 2026/

.rest of tonight...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.friday...northeast winds 10 to 20 knots increasing to 20 to
30 knots. waves building to 2 to 4 feet. 
.friday night...northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then becoming east 5 to 15 knots
late. a slight chance of showers after midnight. waves subsiding
to calm to 2 feet. 
.saturday...northeast winds 10 to 20 knots. a chance of showers.
waves calm to 2 feet. 
.saturday night...northeast winds 5 to 15 knots backing northwest
after midnight. a chance of showers through midnight. waves calm
to 2 feet. 
.sunday...west winds 5 to 15 knots. waves calm to 2 feet. 
.sunday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.monday...southwest winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 
.tuesday...southwest winds 5 to 15 knots veering north. a chance
of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 140201
glfls 
expires:202608140800;;148133

open lake forecast for lake superior
national weather service marquette mi
1001 pm 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...

this evening, 30.0 inch ridging is extending over the lake from a 
30.2 inch high 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 overnight 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 afternoon. 
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 29.5 
inch low over hudson bay extends a 29.9 inch trough over lake 
superior.




lsz263-140800-
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-
1001 pm edt thu aug 13 2026

.rest of tonight...northeast winds less than 10 knots increasing
to 5 to 15 knots late. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots becoming northeast 15 to
25 knots in the afternoon, then becoming east 20 to 30 knots
late. waves building to 1 to 3 feet. 
.friday night...east winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.saturday...east winds 5 to 15 knots. a slight chance of showers
by mid afternoon. waves calm to 2 feet. 
.saturday night...east winds 5 to 15 knots backing northwest
after midnight. a slight chance of thunderstorms through
midnight. a chance of showers. waves calm to 2 feet. 
.sunday...west winds 5 to 15 knots. waves calm to 2 feet. 
.sunday night...west winds 5 to 15 knots diminishing to less than
10 knots after midnight. waves calm to 2 feet. 
.monday...southwest winds 10 to 20 knots. a chance of showers.
waves calm to 2 feet. 
.tuesday...west winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of showers. waves calm to 2 feet. 

$$