fzus63 kmqt 091957
glfls 
expires:202609100800;;650126

open lake forecast for lake superior
national weather service marquette mi
357 pm edt wed sep 9 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 29.0 inch low over hudson bay this afternoon moves into northern 
quebec by early thursday, promoting a strong pressure gradient and 
gales over lake superior. ridging to 30.0 inches and subsequent 
calmer conditions follow from early thursday morning until friday 
morning, when a trough averaging 29.5 inches tracks from the great 
plains north toward hudson bay. a cold front passes through on 
saturday with. ridging in its wake reaching 30.0 inches by sunday.




lsz162-100800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
357 pm edt wed sep 9 2026 /257 pm cdt wed sep 9 2026/

...gale warning in effect until 6 pm edt /5 pm cdt/ this
evening...

.late this afternoon...west winds 20 to 30 knots. waves 3 to
6 feet occasionally to 8 feet subsiding to 2 to 4 feet. 
.tonight...west winds 15 to 25 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 
.thursday...west winds 5 to 15 knots backing southwest in the
afternoon, then becoming south 10 to 20 knots late. waves calm to
2 feet. 
.thursday night...south winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then becoming southwest 15 to 25 knots
late. waves building to 1 to 3 feet. 
.friday...southwest winds 20 to 30 knots. a chance of showers and
a slight chance of thunderstorms by mid afternoon. waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet. 
.friday night...south winds 20 to 30 knots veering southwest
after midnight. showers and a chance of thunderstorms. waves
subsiding to 1 to 3 feet, then building to 3 to 6 feet
occasionally to 8 feet. 
.saturday...west winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet. 
.saturday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to calm to 2 feet. 
.sunday...southwest winds 10 to 20 knots becoming east 20 to
30 knots. a chance of showers. waves building to 2 to 4 feet. 
.monday...east gales to 40 knots becoming west gales to 35 knots.
showers. waves building to 5 to 9 feet occasionally to 11 feet. 

$$

fzus63 kmqt 091957
glfls 
expires:202609100800;;650127

open lake forecast for lake superior
national weather service marquette mi
357 pm edt wed sep 9 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 29.0 inch low over hudson bay this afternoon moves into northern 
quebec by early thursday, promoting a strong pressure gradient and 
gales over lake superior. ridging to 30.0 inches and subsequent 
calmer conditions follow from early thursday morning until friday 
morning, when a trough averaging 29.5 inches tracks from the great 
plains north toward hudson bay. a cold front passes through on 
saturday with. ridging in its wake reaching 30.0 inches by sunday.




lsz263-100800-
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-
357 pm edt wed sep 9 2026

...gale warning in effect until 10 pm edt this evening...

.late this afternoon...west gales to 35 knots. waves 7 to 10 feet
occasionally to 13 feet subsiding to 5 to 8 feet occasionally to
10 feet. 
.tonight...west winds 20 to 30 knots becoming northwest 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
waves subsiding to 1 to 3 feet. 
.thursday...northwest winds 5 to 15 knots becoming southwest
10 to 20 knots in the afternoon. waves subsiding to calm to
2 feet. 
.thursday night...south winds 10 to 20 knots increasing to 20 to
30 knots. waves building to 2 to 4 feet. 
.friday...southwest gales to 35 knots. a slight chance of showers
and thunderstorms by mid afternoon. waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet. 
.friday night...south winds 20 to 30 knots veering southwest
after midnight. showers and a chance of thunderstorms. waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet. 
.saturday...west winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. waves building to 3 to 6 feet
occasionally to 8 feet. 
.saturday night...west winds 20 to 30 knots becoming northwest
15 to 25 knots after midnight. waves subsiding to 1 to 3 feet. 
.sunday...west winds 10 to 20 knots becoming east 15 to 25 knots.
a chance of showers. waves subsiding to calm to 2 feet, then
building to 1 to 3 feet. 
.monday...east gales to 35 knots becoming west gales to 40 knots.
showers. waves building to 7 to 10 feet occasionally to 13 feet. 

$$