fzus63 kmqt 170201
glfls 
expires:202608170800;;321553

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

a 30.1 inch high pressure expands over the midwest tonight, 
extending a 30.0 inch ridge over lake superior. this high weakens to 
30.0 inches on monday and shifts south as a 29.8 inch trough, 
associated with a 29.6 inch low over the hudson bay, builds over 
lake superior. troughing lingers until tuesday afternoon when weak 
29.9 inch ridging returns to lake superior. 30.0 inch high pressure 
settles over the northern plains tuesday afternoon and night, 
eventually moving over lake superior wednesday evening before 
expanding to cover much of the great lakes by thursday afternoon. 
friday into the weekend, a low pressure of around 29.8 inches 
transits across northern ontario.




lsz162-170800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt sun aug 16 2026 /901 pm cdt sun aug 16 2026/

.rest of tonight...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing west late. waves calm
to 2 feet. 
.monday...southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. waves building to 1 to 3 feet. 
.monday night...southwest winds 10 to 20 knots veering west after
midnight. a slight chance of thunderstorms through midnight. a
chance of showers. waves subsiding to calm to 2 feet. 
.tuesday...west winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.tuesday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...south winds 5 to 15 knots veering southwest. a chance
of showers. waves calm to 2 feet. 
.friday...southwest winds 10 to 20 knots veering northwest. a
chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 170201
glfls 
expires:202608170800;;321554

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

a 30.1 inch high pressure expands over the midwest tonight, 
extending a 30.0 inch ridge over lake superior. this high weakens to 
30.0 inches on monday and shifts south as a 29.8 inch trough, 
associated with a 29.6 inch low over the hudson bay, builds over 
lake superior. troughing lingers until tuesday afternoon when weak 
29.9 inch ridging returns to lake superior. 30.0 inch high pressure 
settles over the northern plains tuesday afternoon and night, 
eventually moving over lake superior wednesday evening before 
expanding to cover much of the great lakes by thursday afternoon. 
friday into the weekend, a low pressure of around 29.8 inches 
transits across northern ontario.




lsz263-170800-
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 sun aug 16 2026

.rest of tonight...northwest winds 5 to 15 knots backing west
late. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots becoming southwest 15 to
25 knots in the afternoon. waves building to 2 to 4 feet. 
.monday night...southwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then veering west late. a slight
chance of thunderstorms through midnight. a chance of showers.
waves subsiding to calm to 2 feet. 
.tuesday...west winds 10 to 20 knots. waves building to 1 to
3 feet. 
.tuesday night...west winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing southwest by
mid afternoon. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots diminishing to
less than 10 knots after midnight. waves calm to 2 feet. 
.thursday...southwest winds 10 to 20 knots backing south. a
chance of showers. waves calm to 2 feet. 
.friday...southwest winds 15 to 25 knots becoming northwest 5 to
15 knots. a chance of showers. waves building to 1 to 3 feet,
then subsiding to calm to 2 feet. 

$$