fzus63 kmqt 042001
glfls 
expires:202605050800;;015645

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon may 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 29.1 inch low over far-northeast ontario will lift to james bay at 
29.2 inches by tuesday morning as 30.2 inch ridging builds east of 
the canadian rockies. the low continues lifting into far northern 
quebec through wednesday as high pressure over the canadian prairie 
splits and moves to the canadian four corners and the southern 
plains at 30.0 inches and 30.2 inches respectively. by thursday 
afternoon, lake superior will be between a 29.5 inch low over hudson 
bay, a 29.4 inch low over the mouth of the st lawrence river, a low 
of 29.7 inches over the black hills, a high of 30.1 inches over 
oklahoma, and a weak 29.9 inch high over the saskatchewan/manitoba 
line. the hudson bay and black hills lows will work to pass a 29.8 
inch trough over lake superior thursday night into friday, with the 
lows consolidating over quebec and the canadian maritimes by 
saturday morning, leaving remnant 29.8 inch troughing over lake 
superior.



lsz162-050800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt mon may 4 2026 /301 pm cdt mon may 4 2026/

.late this afternoon...west winds 20 to 30 knots. waves 3 to
5 feet occasionally to 7 feet. 
.tonight...west winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet. 
.tuesday...west winds 15 to 25 knots diminishing to 10 to
20 knots late. waves subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 10 to 20 knots. waves subsiding
to calm to 2 feet. 
.wednesday...west winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...west winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.thursday night...west winds 5 to 15 knots. waves calm to 2 feet.
.friday...west winds 5 to 15 knots veering northwest. waves calm
to 2 feet. 
.saturday...west winds 5 to 15 knots veering northwest. waves
calm to 2 feet. 

$$

fzus63 kmqt 042001
glfls 
expires:202605050800;;015646

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon may 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 29.1 inch low over far-northeast ontario will lift to james bay at 
29.2 inches by tuesday morning as 30.2 inch ridging builds east of 
the canadian rockies. the low continues lifting into far northern 
quebec through wednesday as high pressure over the canadian prairie 
splits and moves to the canadian four corners and the southern 
plains at 30.0 inches and 30.2 inches respectively. by thursday 
afternoon, lake superior will be between a 29.5 inch low over hudson 
bay, a 29.4 inch low over the mouth of the st lawrence river, a low 
of 29.7 inches over the black hills, a high of 30.1 inches over 
oklahoma, and a weak 29.9 inch high over the saskatchewan/manitoba 
line. the hudson bay and black hills lows will work to pass a 29.8 
inch trough over lake superior thursday night into friday, with the 
lows consolidating over quebec and the canadian maritimes by 
saturday morning, leaving remnant 29.8 inch troughing over lake 
superior.



lsz263-050800-
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 pm edt mon may 4 2026

.late this afternoon...west winds 20 to 30 knots. waves 5 to
8 feet occasionally to 10 feet. 
.tonight...west winds 20 to 30 knots becoming northwest 15 to
25 knots after midnight, then becoming west 10 to 20 knots late.
waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.tuesday...west winds 15 to 25 knots. waves building to 3 to
6 feet occasionally to 8 feet. 
.tuesday night...west winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves building to 1 to 3 feet. 
.wednesday night...west winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.thursday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.thursday night...southwest winds 5 to 15 knots veering west
after midnight. waves calm to 2 feet. 
.friday...southwest winds 5 to 15 knots veering northwest. waves
calm to 2 feet. 
.saturday...west winds 5 to 15 knots veering northwest. waves
calm to 2 feet. 

$$