fzus63 kmqt 200801
glfls 
expires:202607202000;;278343

open lake forecast for lake superior
national weather service marquette mi
401 am 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.




lsz162-202000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt mon jul 20 2026 /301 am cdt mon jul 20 2026/

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

$$

fzus63 kmqt 200801
glfls 
expires:202607202000;;278344

open lake forecast for lake superior
national weather service marquette mi
401 am 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.




lsz263-202000-
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-
401 am edt mon jul 20 2026

...dense smoke advisory in effect until 8 am edt this morning...

.early this morning...southwest winds 15 to 25 knots. patchy
smoke. a chance of showers and thunderstorms. waves 2 to 4 feet
building to 3 to 5 feet occasionally to 7 feet. 
.today...southwest winds 20 to 30 knots. patchy smoke through
early afternoon. showers likely and a slight chance of
thunderstorms through early afternoon, then a chance of showers
and thunderstorms by mid afternoon. some thunderstorms may be
severe by mid afternoon. waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 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 slight
chance of thunderstorms through midnight. a slight chance of
showers. some thunderstorms may be severe. waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.tuesday...northwest winds 20 to 30 knots veering north in the
afternoon. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet. 
.tuesday night...northwest winds 10 to 20 knots. waves subsiding
to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots becoming southwest 10 to
20 knots 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 10 to 20 knots diminishing to 5 to
15 knots. a chance of showers. waves subsiding to calm to 2 feet.
.friday...south winds 5 to 15 knots veering southwest. waves calm
to 2 feet. 

$$