fzus63 kmqt 210202
glfls 
expires:202607210800;;321439

open lake forecast for lake superior
national weather service marquette mi
1001 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-
1001 pm edt mon jul 20 2026 /901 pm cdt mon jul 20 2026/

.rest of tonight...west winds 15 to 25 knots increasing to 20 to
30 knots after midnight. patchy smoke by midnight. a slight
chance of thunderstorms by midnight. a slight chance of showers.
waves 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 building to 1 to 3 feet. 
.wednesday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.thursday...southwest winds 10 to 20 knots. waves building to
1 to 3 feet. 
.thursday night...southwest winds 5 to 15 knots. waves subsiding
to calm to 2 feet. 
.friday...southwest winds 10 to 20 knots. a chance of showers.
waves building to 1 to 3 feet. 
.saturday...southwest winds 15 to 25 knots diminishing to 10 to
20 knots. a chance of showers. waves building to 2 to 4 feet,
then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 210202
glfls 
expires:202607210800;;321440

open lake forecast for lake superior
national weather service marquette mi
1001 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-
1001 pm edt mon jul 20 2026

.rest of tonight...west winds 15 to 25 knots. a chance of showers
and a slight chance of thunderstorms. waves 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 1 to 3 feet. 
.wednesday...northwest winds 10 to 20 knots backing southwest by
mid afternoon. waves subsiding to calm to 2 feet, then 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. 
.thursday...southwest winds 15 to 25 knots. waves building to
2 to 4 feet. 
.thursday night...southwest winds 10 to 20 knots. a chance of
showers and thunderstorms. waves subsiding to calm to 2 feet,
then building to 1 to 3 feet. 
.friday...southwest winds 10 to 20 knots increasing to 15 to
25 knots. waves subsiding to calm to 2 feet, then building to
2 to 4 feet. 
.saturday...southwest winds 15 to 25 knots diminishing to 10 to
20 knots. a chance of showers. waves subsiding to 1 to 3 feet. 

$$