fzus63 kmqt 200757
glfls 
expires:202605202000;;336361

open lake forecast for lake superior
national weather service marquette mi
356 am edt wed may 20 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 30.3 inch high over the northern plains shifts over lake superior 
today and builds to 30.4 inches tonight. the high pressure shifts 
east thursday night while leaving lingering ridging of at least 30.3 
inches over lake superior through friday. a 29.9 inch low then lifts 
into the lower great lakes from the southern plains friday night and 
saturday, but 30.1 inch ridging persists over lake superior the 
remainder of the weekend.



lsz162-202000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
356 am edt wed may 20 2026 /256 am cdt wed may 20 2026/

.early this morning...northwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...west winds 5 to 15 knots backing south in the afternoon.
waves calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots backing northeast late.
waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots. waves calm to 2 feet. 
.thursday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.friday...east winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet. 
.friday night...northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 1 to 3 feet. 
.saturday...northeast winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of rain showers. waves building to 2 to
4 feet, then subsiding to calm to 2 feet. 
.sunday...southwest winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 200757
glfls 
expires:202605202000;;336362

open lake forecast for lake superior
national weather service marquette mi
356 am edt wed may 20 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 30.3 inch high over the northern plains shifts over lake superior 
today and builds to 30.4 inches tonight. the high pressure shifts 
east thursday night while leaving lingering ridging of at least 30.3 
inches over lake superior through friday. a 29.9 inch low then lifts 
into the lower great lakes from the southern plains friday night and 
saturday, but 30.1 inch ridging persists over lake superior the 
remainder of the weekend.



lsz263-202000-
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-
356 am edt wed may 20 2026

.early this morning...northwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...northwest winds 5 to 15 knots backing southwest in the
afternoon, then backing south late. waves calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots diminishing to less than
10 knots after midnight, then becoming south 5 to 15 knots late.
waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing east late. waves
calm to 2 feet. 
.thursday night...east winds 5 to 15 knots veering southeast
after midnight. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves building to 2 to 4 feet. 
.friday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to 1 to 3 feet. 
.saturday...east winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of rain showers. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.sunday...southwest winds 5 to 15 knots. waves subsiding to calm
to 2 feet. 

$$