fzus63 kmqt 202001
glfls 
expires:202607210800;;306605

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon jul 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 low pressure will track into ontario and deepen to 29.4 inches 
tonight with a 29.5 inch trough over lake superior. the low will 
then push east into quebec and retrograde to northern quebec for 
midweek. meanwhile a 30.1 inch ridge descends southeast over the 
midwest tuesday through wednesday night, moving into the ohio river 
valley on thursday with weak ridging of 29.9 inches extending back 
northwest over lake superior. another high pressure of 30.1 inches 
will move south through ontario on friday building to 30.2 inches 
over eastern ontario by saturday morning, extending a 30.1 inch 
ridge over lake superior.




lsz162-210800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt mon jul 20 2026 /301 pm cdt mon jul 20 2026/

.late this afternoon...west winds 20 to 30 knots. patchy smoke. a
slight chance of showers and thunderstorms. some thunderstorms
may be severe. waves 3 to 6 feet occasionally to 8 feet. 
.tonight...west winds 20 to 30 knots. patchy smoke through
midnight. a slight chance of showers and thunderstorms after
midnight. waves subsiding to 1 to 3 feet. 
.tuesday...northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then veering north late. waves
building to 2 to 4 feet, then subsiding to calm to 2 feet. 
.tuesday night...north winds 10 to 20 knots backing northwest
after midnight. waves calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots becoming southwest
10 to 20 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet. 
.thursday...southwest winds 10 to 20 knots. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 
.thursday night...southwest winds 5 to 15 knots. waves calm to
2 feet. 
.friday...southwest winds 10 to 20 knots. a chance of showers.
waves calm to 2 feet. 
.saturday...southwest winds 15 to 25 knots diminishing to 10 to
20 knots. a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 202001
glfls 
expires:202607210800;;306606

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon jul 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 low pressure will track into ontario and deepen to 29.4 inches 
tonight with a 29.5 inch trough over lake superior. the low will 
then push east into quebec and retrograde to northern quebec for 
midweek. meanwhile a 30.1 inch ridge descends southeast over the 
midwest tuesday through wednesday night, moving into the ohio river 
valley on thursday with weak ridging of 29.9 inches extending back 
northwest over lake superior. another high pressure of 30.1 inches 
will move south through ontario on friday building to 30.2 inches 
over eastern ontario by saturday morning, extending a 30.1 inch 
ridge over lake superior.




lsz263-210800-
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 mon jul 20 2026

.late this afternoon...west winds 20 to 30 knots. patchy smoke. a
chance of showers and thunderstorms. some thunderstorms may be
severe. waves 3 to 6 feet occasionally to 8 feet. 
.tonight...west winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. patchy smoke through midnight. a chance
of showers. a slight chance of thunderstorms after midnight.
waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.tuesday...northwest winds 20 to 30 knots veering north late.
waves subsiding to 2 to 4 feet. 
.tuesday night...north winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. patchy smoke through midnight.
waves subsiding to calm to 2 feet. 
.wednesday...northwest winds 10 to 20 knots backing southwest by
mid afternoon. waves building to 1 to 3 feet. 
.wednesday night...southwest winds 10 to 20 knots veering west
after midnight. waves subsiding to calm to 2 feet, then building
to 1 to 3 feet. 
.thursday...southwest winds 15 to 25 knots. waves building to
2 to 4 feet, then subsiding to 1 to 3 feet. 
.thursday night...southwest winds 10 to 20 knots. a chance of
showers and thunderstorms. waves subsiding to calm to 2 feet. 
.friday...southwest winds 10 to 20 knots increasing to 15 to
25 knots. waves calm to 2 feet. 
.saturday...southwest winds 15 to 25 knots diminishing to 10 to
20 knots. a chance of showers. waves building to 1 to 3 feet,
then subsiding to calm to 2 feet. 

$$