fzus63 kmqt 220201
glfls 
expires:202608220800;;140349

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt fri aug 21 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 through saturday 
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.




lsz162-220800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt fri aug 21 2026 /900 pm cdt fri aug 21 2026/

.rest of tonight...west winds 5 to 15 knots becoming northwest
10 to 20 knots late. a slight chance of thunderstorms by
midnight. a slight chance of showers. waves calm to 2 feet. 
.saturday...northwest winds 10 to 20 knots backing west late.
waves calm to 2 feet. 
.saturday night...north winds 10 to 20 knots. waves calm to
2 feet. 
.sunday...north winds 5 to 15 knots veering south by mid
afternoon. waves calm to 2 feet. 
.sunday night...south winds 5 to 15 knots becoming north less
than 10 knots after midnight. waves calm to 2 feet. 
.monday...north winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.monday night...east winds 5 to 15 knots becoming south 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 10 to 20 knots becoming northwest 5 to
15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 220201
glfls 
expires:202608220800;;140350

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt fri aug 21 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 through saturday 
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.




lsz263-220800-
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-
1000 pm edt fri aug 21 2026

.rest of tonight...southwest winds 5 to 15 knots veering west
after midnight, then becoming northwest 10 to 20 knots late. a
slight chance of showers and thunderstorms after midnight. waves
calm to 2 feet. 
.saturday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. waves calm to 2 feet. 
.saturday night...north winds 10 to 20 knots. waves building to
1 to 3 feet. 
.sunday...north winds 10 to 20 knots becoming west 5 to 15 knots
by mid afternoon. waves building to 2 to 4 feet, then subsiding
to calm to 2 feet. 
.sunday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.monday...northwest winds less than 10 knots becoming southwest
5 to 15 knots by mid afternoon. waves calm to 2 feet. 
.monday night...south winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots becoming west 10 to
20 knots. 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. waves calm to 2 feet. 

$$