fzus63 kmqt 152001
glfls 
expires:202608160800;;249658

open lake forecast for lake superior
national weather service marquette mi
401 pm edt sat aug 15 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 over new england will weaken and shift east through 
sunday as a 29.9 inch trough builds over the lake. the associated 
low deepens to 29.7 inches as it reaches quebec sunday night. into 
monday, a 30.1 inch high over the plains weakens to 30.0 inches as 
it slides generally south of the great lakes tuesday. meanwhile 
tuesday, a 29.4 inch low over hudson bay extends a 29.8 inch trough 
over lake superior. wednesday into thursday morning, ridging of 30.1 
inches moves over the upper great lakes from the plains. this 
ridging shifts east thursday night into friday as a 29.9 inch trough 
builds over the lake from the west.




lsz162-160800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt sat aug 15 2026 /301 pm cdt sat aug 15 2026/

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

$$

fzus63 kmqt 152001
glfls 
expires:202608160800;;249659

open lake forecast for lake superior
national weather service marquette mi
401 pm edt sat aug 15 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 over new england will weaken and shift east through 
sunday as a 29.9 inch trough builds over the lake. the associated 
low deepens to 29.7 inches as it reaches quebec sunday night. into 
monday, a 30.1 inch high over the plains weakens to 30.0 inches as 
it slides generally south of the great lakes tuesday. meanwhile 
tuesday, a 29.4 inch low over hudson bay extends a 29.8 inch trough 
over lake superior. wednesday into thursday morning, ridging of 30.1 
inches moves over the upper great lakes from the plains. this 
ridging shifts east thursday night into friday as a 29.9 inch trough 
builds over the lake from the west.




lsz263-160800-
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 pm edt sat aug 15 2026

.late this afternoon...east winds 10 to 20 knots. a chance of
showers. waves 1 to 3 feet building to 2 to 4 feet. 
.tonight...east winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then veering west late. showers likely through
midnight. a chance of thunderstorms. a slight chance of showers
after midnight. waves subsiding to calm to 2 feet. 
.sunday...west winds 10 to 20 knots. a slight chance of showers
through early afternoon. waves building to 1 to 3 feet. 
.sunday night...west winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight, then backing west late. waves subsiding
to calm to 2 feet. 
.monday...west winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet. 
.monday night...southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. a chance of showers. waves
subsiding to calm to 2 feet. 
.tuesday...west winds 10 to 20 knots diminishing to 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...northwest winds 5 to 15 knots backing west. waves
calm to 2 feet. 
.thursday...southwest winds 10 to 20 knots backing south. waves
calm to 2 feet. 

$$