fzus63 kmqt 220201
glfls 
expires:202510220800;;539372

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt tue oct 21 2025

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 29.4 inch low over the keweenaw this evening pivots southeast 
toward lake michigan tonight, weakening to 29.5 inches over northern 
lower michigan early wednesday morning. the low quickly re-organizes 
over gregorian bay, tracking northeast to quebec by wednesday 
evening. this will maintain a tight pressure gradient over lake 
superior. a 30.3 inch high builds to the west and south of the great 
lakes wednesday night into friday morning, then shifting northeast 
to quebec by the end of the weekend at 30.5 inches.



lsz162-220800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt tue oct 21 2025 /901 pm cdt tue oct 21 2025/

.rest of tonight...north winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 20 to 30 knots after
midnight. a chance of showers. waves 4 to 8 feet occasionally to
10 feet, then subsiding to 4 to 7 feet occasionally to 9 feet. 
.wednesday...north winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. showers likely through early
afternoon, then a chance of showers by mid afternoon. waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet. 
.wednesday night...northwest winds 15 to 25 knots veering north
after midnight, then backing northwest late. a chance of rain
showers. waves subsiding to 1 to 3 feet. 
.thursday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. a slight chance of rain showers
through early afternoon. waves subsiding to calm to 2 feet. 
.thursday night...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.friday...northwest winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.friday night...southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. waves calm to 2 feet. 
.saturday...south winds 10 to 20 knots. waves calm to 2 feet. 
.sunday...southeast winds 10 to 20 knots increasing to 15 to
25 knots. waves building to 2 to 4 feet. 

$$

fzus63 kmqt 220201
glfls 
expires:202510220800;;539373

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt tue oct 21 2025

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 29.4 inch low over the keweenaw this evening pivots southeast 
toward lake michigan tonight, weakening to 29.5 inches over northern 
lower michigan early wednesday morning. the low quickly re-organizes 
over gregorian bay, tracking northeast to quebec by wednesday 
evening. this will maintain a tight pressure gradient over lake 
superior. a 30.3 inch high builds to the west and south of the great 
lakes wednesday night into friday morning, then shifting northeast 
to quebec by the end of the weekend at 30.5 inches.



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-
1001 pm edt tue oct 21 2025

...gale warning in effect until 8 am edt wednesday...

.rest of tonight...north gales to 35 knots diminishing to 20 to
30 knots late. showers. waves 6 to 9 feet occasionally to 11 feet
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 7 to 10 feet occasionally to 13 feet. 
.wednesday...north winds 20 to 30 knots becoming northwest 15 to
25 knots late. rain showers likely. waves subsiding to 3 to
5 feet occasionally to 7 feet. 
.wednesday night...north winds 15 to 25 knots. a chance of rain
showers. waves building to 3 to 6 feet occasionally to 8 feet. 
.thursday...northwest winds 15 to 25 knots. a chance of rain
showers. waves subsiding to 2 to 4 feet. 
.thursday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.friday...northwest winds 5 to 15 knots backing west by mid
afternoon. waves calm to 2 feet. 
.friday night...southeast winds 5 to 15 knots veering south after
midnight. waves calm to 2 feet. 
.saturday...south winds 5 to 15 knots increasing to 10 to
20 knots. waves building to 1 to 3 feet. 
.sunday...south winds 10 to 20 knots becoming southeast 15 to
25 knots. waves building to 2 to 4 feet. 

$$