fzus63 kmqt 210201
glfls 
expires:202604210800;;720128

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt mon apr 20 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 moving from northern manitoba to hudson bay swings a 
29.8 inch trough across lake superior tonight into tuesday morning. 
30.0 inch high pressure ridging returns over the lake by tuesday 
afternoon as the low weakens over hudson bay. a 29.2 inch low then 
develops over the northern rockies on wednesday and tracks into 
manitoba at around 29.5 inches on friday. this sends 29.6 inch 
troughing over lake superior thursday night into friday. 30.1 inch 
ridging slowly returns to lake superior on saturday.



lsz162-210800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt mon apr 20 2026 /900 pm cdt mon apr 20 2026/

.rest of tonight...southwest winds 10 to 20 knots becoming west
5 to 15 knots late. waves 1 to 3 feet subsiding to calm to
2 feet. 
.tuesday...northwest winds 5 to 15 knots backing southwest in the
afternoon, then backing south late. waves calm to 2 feet. 
.tuesday night...south winds 5 to 15 knots backing northeast
after midnight, then veering east late. waves calm to 2 feet. 
.wednesday...east winds 5 to 15 knots backing northeast by mid
afternoon. waves calm to 2 feet. 
.wednesday night...northeast winds 10 to 20 knots veering east
after midnight. a slight chance of rain showers. waves building
to 1 to 3 feet. 
.thursday...east winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. a chance of rain showers by mid
afternoon. waves building to 2 to 4 feet. 
.thursday night...east winds 10 to 20 knots. rain showers and a
chance of thunderstorms. waves building to 4 to 7 feet
occasionally to 9 feet. 
.friday...west winds 10 to 20 knots. waves subsiding to 2 to
4 feet. 
.saturday...west winds 10 to 20 knots. waves subsiding to calm to
2 feet. 

$$