fzus63 kmqt 041401
glfls 
expires:202610042000;;519847

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sun oct 4 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 29.7 inch low over northeast ontario this morning will deepen to 
29.5 inches over northern quebec by monday morning. as this low 
departs, 30.3 inch high pressure over the northern plains today will 
shift east to to the great lakes on monday. a 29.5 inch low then 
drops southeast out of northern canada, reaching northern ontario at 
29.5 inches by tuesday evening. this brings 29.6 inch troughing over 
lake superior on tuesday, weakening to 29.7 inches through 
wednesday. high pressure builds back in from the canadian prairie 
and northern plains late in the week, resulting in 30.1 inch 
ridging over lake superior late thursday into friday.




lsz162-042000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt sun oct 4 2026 /901 am cdt sun oct 4 2026/

.rest of today...northwest winds 20 to 30 knots diminishing to
15 to 25 knots in the afternoon, then backing west late. waves
3 to 5 feet occasionally to 7 feet subsiding to 1 to 3 feet. 
.tonight...northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. waves subsiding to calm to 2 feet. 
.monday...north winds 5 to 15 knots veering south in the
afternoon. waves calm to 2 feet. 
.monday night...southeast winds 10 to 20 knots veering south
after midnight. waves building to 2 to 4 feet. 
.tuesday...southwest winds 15 to 25 knots veering west by mid
afternoon. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.tuesday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 15 to 25 knots diminishing to 10 to
20 knots. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 
.thursday...west winds 10 to 20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 041401
glfls 
expires:202610042000;;519848

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sun oct 4 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 29.7 inch low over northeast ontario this morning will deepen to 
29.5 inches over northern quebec by monday morning. as this low 
departs, 30.3 inch high pressure over the northern plains today will 
shift east to to the great lakes on monday. a 29.5 inch low then 
drops southeast out of northern canada, reaching northern ontario at 
29.5 inches by tuesday evening. this brings 29.6 inch troughing over 
lake superior on tuesday, weakening to 29.7 inches through 
wednesday. high pressure builds back in from the canadian prairie 
and northern plains late in the week, resulting in 30.1 inch 
ridging over lake superior late thursday into friday.




lsz263-042000-
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 am edt sun oct 4 2026

.rest of today...northwest winds 20 to 30 knots backing west
late. waves 5 to 8 feet occasionally to 10 feet subsiding to 3 to
6 feet occasionally to 8 feet. 
.tonight...northwest winds 15 to 25 knots diminishing to 10 to
20 knots late. sprinkles through midnight. waves subsiding to
2 to 4 feet. 
.monday...north winds 5 to 15 knots backing northwest in the
afternoon, then backing south late. waves subsiding to calm to
2 feet. 
.monday night...southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.tuesday...south winds 15 to 25 knots veering southwest by mid
afternoon. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.tuesday night...west winds 15 to 25 knots. waves building to
3 to 5 feet occasionally to 7 feet. 
.wednesday...west winds 15 to 25 knots. waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to 1 to 3 feet. 
.thursday...west winds 10 to 20 knots. waves subsiding to calm to
2 feet. 

$$