fzus63 kmqt 190201
glfls 
expires:202607190800;;207818

open lake forecast for lake superior
national weather service marquette mi
1001 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 30.0 inch high builds over the upper great lakes tonight. the high 
then moves 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-
1001 pm edt sat jul 18 2026 /901 pm cdt sat jul 18 2026/

.rest of 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
and a slight chance of thunderstorms 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 subsiding to calm to 2 feet. 
.tuesday night...north winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. waves building to 1 to 3 feet, then
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 190201
glfls 
expires:202607190800;;207819

open lake forecast for lake superior
national weather service marquette mi
1001 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 30.0 inch high builds over the upper great lakes tonight. the high 
then moves 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-
1001 pm edt sat jul 18 2026

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

.rest of 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 slight chance of
thunderstorms through midnight. a chance of showers. waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet. 
.tuesday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 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. 

$$