fzus63 kmqt 190201
glfls 
expires:202608190800;;965641

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt tue aug 18 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 tonight and early 
wednesday morning builds to 30.0 inches wednesday afternoon as high 
pressure over the canadian prairies and northern plains tonight 
moves into the upper great lakes. this high then expands into the 
rest of the great lakes by thursday as it strengthens to 30.1 
inches. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario, bringing 29.9 inch 
troughing over lake superior friday into saturday. this is quickly 
followed by 30.1 inch ridging for the latter part of the weekend 
into early next week via a 30.2 inch parent high from canada.




lsz162-190800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt tue aug 18 2026 /900 pm cdt tue aug 18 2026/

.rest of tonight...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest in the
afternoon. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots backing
northeast after midnight. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots. a chance of showers. a
slight chance of thunderstorms by mid afternoon. waves calm to
2 feet. 
.thursday night...east winds 5 to 15 knots backing northeast
after midnight. a slight chance of thunderstorms through
midnight. a chance of showers. waves calm to 2 feet. 
.friday...northeast winds 5 to 15 knots backing north by mid
afternoon. waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots veering north. waves
calm to 2 feet. 
.sunday...east winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 190201
glfls 
expires:202608190800;;965642

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt tue aug 18 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 tonight and early 
wednesday morning builds to 30.0 inches wednesday afternoon as high 
pressure over the canadian prairies and northern plains tonight 
moves into the upper great lakes. this high then expands into the 
rest of the great lakes by thursday as it strengthens to 30.1 
inches. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario, bringing 29.9 inch 
troughing over lake superior friday into saturday. this is quickly 
followed by 30.1 inch ridging for the latter part of the weekend 
into early next week via a 30.2 inch parent high from canada.




lsz263-190800-
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-
1000 pm edt tue aug 18 2026

.rest of tonight...west winds 5 to 15 knots veering northwest
late. waves 1 to 3 feet subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing southwest
late. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming south
less than 10 knots after midnight. waves calm to 2 feet. 
.thursday...south winds less than 10 knots becoming southeast
5 to 15 knots by mid afternoon. a slight chance of showers. a
slight chance of thunderstorms by mid afternoon. waves calm to
2 feet. 
.thursday night...southeast winds 5 to 15 knots backing east
after midnight. a slight chance of thunderstorms through
midnight. a chance of showers. waves calm to 2 feet. 
.friday...northeast winds 5 to 15 knots backing north by mid
afternoon. waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots veering north. waves
calm to 2 feet. 
.sunday...north winds 5 to 15 knots veering southeast. waves calm
to 2 feet. 

$$