fzus63 kmqt 172001
glfls 
expires:202607180800;;137062

open lake forecast for lake superior
national weather service marquette mi
401 pm edt fri jul 17 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 29.7 inch low crosses lake superior tonight and moves to southern 
quebec by saturday afternoon. weak ridging of around 30.0 inches 
returns to the great lakes late saturday and persists through 
sunday. a strong low ranging from 29.1 to 29.4 inches over northern 
ontario looks to bring troughing of around 29.5 inches over lake 
superior on monday.




lsz162-180800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt fri jul 17 2026 /301 pm cdt fri jul 17 2026/

...dense smoke advisory in effect until 6 am edt /5 am cdt/
saturday...

.late this afternoon...east winds 5 to 15 knots. areas of smoke.
a chance of showers and a slight chance of thunderstorms. waves
calm to 2 feet. 
.tonight...southwest winds 10 to 20 knots veering west after
midnight. a slight chance of showers and thunderstorms through
midnight. areas of smoke. waves calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots backing southwest in
the afternoon. patchy smoke. waves calm to 2 feet. 
.saturday night...southwest winds 5 to 15 knots veering north
after midnight, then becoming northeast less than 10 knots late.
smoke. waves calm to 2 feet. 
.sunday...southwest winds 5 to 15 knots. smoke through early
afternoon. waves calm to 2 feet. 
.sunday night...southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. a chance of thunderstorms. showers
likely after midnight. waves calm to 2 feet. 
.monday...southwest winds 15 to 25 knots becoming west 20 to
30 knots by mid afternoon. a chance of showers. waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet. 
.monday night...west winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. a chance of showers. waves subsiding to
1 to 3 feet, then building to 2 to 4 feet. 
.tuesday...northwest winds 20 to 30 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots veering west. waves
calm to 2 feet. 

$$

fzus63 kmqt 172001
glfls 
expires:202607180800;;137063

open lake forecast for lake superior
national weather service marquette mi
401 pm edt fri jul 17 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 29.7 inch low crosses lake superior tonight and moves to southern 
quebec by saturday afternoon. weak ridging of around 30.0 inches 
returns to the great lakes late saturday and persists through 
sunday. a strong low ranging from 29.1 to 29.4 inches over northern 
ontario looks to bring troughing of around 29.5 inches over lake 
superior on monday.




lsz263-180800-
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 fri jul 17 2026

...dense smoke advisory in effect until 6 am edt saturday...

.late this afternoon...east winds 5 to 15 knots. smoke. a chance
of showers and a slight chance of thunderstorms. waves calm to
2 feet. 
.tonight...west winds 5 to 15 knots. a chance of showers and
thunderstorms through midnight. smoke. waves building to 1 to
3 feet. 
.saturday...northwest winds 5 to 15 knots backing southwest late.
patchy smoke. waves subsiding to calm to 2 feet. 
.saturday night...west winds 5 to 15 knots backing southeast
after midnight, then veering south late. areas of smoke. waves
calm to 2 feet. 
.sunday...south winds 5 to 15 knots. smoke through early
afternoon. waves calm to 2 feet. 
.sunday night...south winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. a chance of showers. waves
building to 2 to 4 feet. 
.monday...southwest winds 20 to 30 knots. a chance of showers
through early afternoon. showers likely by mid afternoon. waves
building to 3 to 5 feet occasionally to 7 feet. 
.monday night...west winds 15 to 25 knots increasing to 20 to
30 knots after midnight. a chance of showers. waves subsiding to
2 to 4 feet, then building to 3 to 6 feet occasionally to 8 feet.
.tuesday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. waves subsiding to 1 to 3 feet. 
.wednesday...northwest winds 10 to 20 knots becoming west 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$