fzus63 kmqt 220801
glfls 
expires:202608222000;;155529

open lake forecast for lake superior
national weather service marquette mi
401 am edt sat aug 22 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 trough will linger over lake superior this morning. this 
is followed by 30.1 inch ridging for the latter part of the weekend 
into early next week via a 30.2 inch parent high from the canadian 
prairies that drops down into the ohio river valley by late monday, 
weakening to 30.1 inches as it does so. a 29.7 inch low over the 
canadian prairies monday night then drops southeast towards lake 
superior, arriving early wednesday morning. the low shifts east 
wendesday night with weak ridging of 29.9 inches building over the 
lake on thursday.




lsz162-222000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt sat aug 22 2026 /301 am cdt sat aug 22 2026/

.early this morning...northwest winds 10 to 20 knots. waves calm
to 2 feet. 
.today...northwest winds 10 to 20 knots. waves calm to 2 feet. 
.tonight...north winds 10 to 20 knots. waves calm to 2 feet. 
.sunday...north winds 5 to 15 knots veering south in the
afternoon. waves calm to 2 feet. 
.sunday night...west winds 5 to 15 knots becoming northwest less
than 10 knots after midnight. waves calm to 2 feet. 
.monday...north winds less than 10 knots becoming southeast 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.monday night...east winds 5 to 15 knots becoming southeast less
than 10 knots after midnight. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots veering west. a chance of
showers and thunderstorms. waves calm to 2 feet. 
.wednesday...west winds 5 to 15 knots veering northwest. waves
calm to 2 feet. 

$$

fzus63 kmqt 220801
glfls 
expires:202608222000;;155530

open lake forecast for lake superior
national weather service marquette mi
401 am edt sat aug 22 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 trough will linger over lake superior this morning. this 
is followed by 30.1 inch ridging for the latter part of the weekend 
into early next week via a 30.2 inch parent high from the canadian 
prairies that drops down into the ohio river valley by late monday, 
weakening to 30.1 inches as it does so. a 29.7 inch low over the 
canadian prairies monday night then drops southeast towards lake 
superior, arriving early wednesday morning. the low shifts east 
wendesday night with weak ridging of 29.9 inches building over the 
lake on thursday.




lsz263-222000-
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 sat aug 22 2026

.early this morning...northwest winds 10 to 20 knots. a slight
chance of showers. waves calm to 2 feet. 
.today...northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. waves calm to 2 feet. 
.tonight...north winds 10 to 20 knots. waves building to 2 to
4 feet. 
.sunday...north winds 10 to 20 knots becoming west 5 to 15 knots
late. waves subsiding to calm to 2 feet. 
.sunday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.monday...north winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.monday night...southwest winds 5 to 15 knots backing south after
midnight. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots veering southwest. a chance
of showers. a chance of thunderstorms. showers likely. waves calm
to 2 feet. 
.wednesday...west winds 10 to 20 knots becoming northwest 5 to
15 knots. a chance of showers. waves calm to 2 feet. 

$$