fzus63 kmqt 192001
glfls 
expires:202607200800;;250127

open lake forecast for lake superior
national weather service marquette mi
401 pm edt sun jul 19 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... 

30.0 high pressure moves east as a 29.5 inch low moves into manitoba 
tonight, bringing troughing of 29.7 inches to the upper midwest. the 
low will track into ontario and deepen to 29.4 inches monday night 
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.




lsz162-200800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt sun jul 19 2026 /301 pm cdt sun jul 19 2026/

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

$$

fzus63 kmqt 192001
glfls 
expires:202607200800;;250128

open lake forecast for lake superior
national weather service marquette mi
401 pm edt sun jul 19 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... 

30.0 high pressure moves east as a 29.5 inch low moves into manitoba 
tonight, bringing troughing of 29.7 inches to the upper midwest. the 
low will track into ontario and deepen to 29.4 inches monday night 
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.




lsz263-200800-
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 sun jul 19 2026

...dense smoke advisory in effect until 8 am edt monday...

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

$$