fzus63 kmqt 182001
glfls 
expires:202607190800;;193501

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sat jul 18 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 29.9 inch high pressure will build over the lake this evening, 
building to 30.0 inches by sunday morning. the high will then move 
east as a 29.5 inch low moves into manitoba by late sunday night, 
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.




lsz162-190800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt sat jul 18 2026 /300 pm cdt sat jul 18 2026/

.late this afternoon...south winds 5 to 15 knots. patchy smoke.
waves calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots diminishing to less than
10 knots after midnight, then becoming north 5 to 15 knots late.
areas of smoke. waves calm to 2 feet. 
.sunday...southwest winds 5 to 15 knots backing south late. areas
of smoke. a slight chance of showers by mid afternoon. waves calm
to 2 feet. 
.sunday night...southwest winds 5 to 15 knots increasing to 10 to
20 knots late. a chance of showers and a slight chance of
thunderstorms. waves calm to 2 feet. 
.monday...southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. a chance of showers through early
afternoon. a chance of thunderstorms. showers likely by mid
afternoon. waves building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.monday night...west winds 15 to 25 knots. a chance of showers
through midnight. waves subsiding to calm to 2 feet, then
building to 1 to 3 feet. 
.tuesday...northwest winds 15 to 25 knots becoming north 10 to
20 knots by mid afternoon. waves 1 to 3 feet. 
.tuesday night...north winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...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. 
.thursday...southwest winds 10 to 20 knots. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 182001
glfls 
expires:202607190800;;193502

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sat jul 18 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 29.9 inch high pressure will build over the lake this evening, 
building to 30.0 inches by sunday morning. the high will then move 
east as a 29.5 inch low moves into manitoba by late sunday night, 
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.




lsz263-190800-
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 pm edt sat jul 18 2026

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

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

$$