fzus63 kmqt 190801
glfls 
expires:202607192000;;222084

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




lsz263-192000-
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-
400 am edt sun jul 19 2026

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

.early this morning...south winds 5 to 15 knots. areas of smoke.
waves calm to 2 feet. 
.today...southwest winds 5 to 15 knots. areas of smoke. waves
calm to 2 feet. 
.tonight...south winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then becoming southwest 15 to 25 knots late.
patchy smoke through midnight. a chance of showers and
thunderstorms. waves building to 1 to 3 feet. 
.monday...southwest winds 15 to 25 knots. a chance of showers and
thunderstorms. 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. 
.tuesday...northwest winds 15 to 25 knots veering north by mid
afternoon. waves 2 to 4 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...southwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves calm to 2 feet. 
.thursday...southwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 

$$

fzus63 kmqt 190801
glfls 
expires:202607192000;;222083

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




lsz162-192000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt sun jul 19 2026 /300 am cdt sun jul 19 2026/

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

$$