fzus63 kmqt 200201
glfls 
expires:202604200800;;665795

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt sun apr 19 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...

high pressure will build to 30.3 inches over lake superior tonight 
through monday morning. a 29.2 inch low moving from northern 
manitoba to hudson bay on monday will swing a 29.8 inch trough 
across the lake monday night. 30.0 inch high pressure returns over 
the lake on tuesday as the low weakens over hudson bay. a 29.2 inch 
low will develop over the northern rockies on wednesday and track to 
central manitoba at 29.5 inches by late friday. this will send 29.6 
inch troughing over lake superior thursday night into friday.



lsz162-200800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt sun apr 19 2026 /900 pm cdt sun apr 19 2026/

.rest of tonight...north winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots increasing to 15 to 25 knots.
waves building to 2 to 4 feet. 
.monday night...southwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then becoming west 5 to 15 knots
late. waves subsiding to calm to 2 feet. 
.tuesday...northwest winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.tuesday night...east winds less than 10 knots. 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. waves building to 3 to 5 feet occasionally to
7 feet. 
.thursday...east winds 15 to 25 knots increasing to 20 to
30 knots. a chance of rain showers. rain showers likely. waves
building to 5 to 8 feet occasionally to 10 feet. 
.friday...southwest winds 20 to 30 knots becoming west 15 to
25 knots. a chance of rain showers. waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet. 

$$

fzus63 kmqt 200201
glfls 
expires:202604200800;;665796

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt sun apr 19 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...

high pressure will build to 30.3 inches over lake superior tonight 
through monday morning. a 29.2 inch low moving from northern 
manitoba to hudson bay on monday will swing a 29.8 inch trough 
across the lake monday night. 30.0 inch high pressure returns over 
the lake on tuesday as the low weakens over hudson bay. a 29.2 inch 
low will develop over the northern rockies on wednesday and track to 
central manitoba at 29.5 inches by late friday. this will send 29.6 
inch troughing over lake superior thursday night into friday.



lsz263-200800-
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-
1000 pm edt sun apr 19 2026

.rest of tonight...north winds 5 to 15 knots backing northwest
late. waves 1 to 3 feet subsiding to calm to 2 feet. 
.monday...southwest winds 5 to 15 knots increasing to 15 to
25 knots in the afternoon, then becoming south 20 to 30 knots
late. a slight chance of rain and snow showers by mid afternoon.
waves building to 3 to 5 feet occasionally to 7 feet. 
.monday night...southwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight, then becoming west 10 to 20 knots
late. waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet. 
.tuesday...northwest winds 5 to 15 knots backing southwest by mid
afternoon. waves subsiding to calm to 2 feet. 
.tuesday night...southwest winds less than 10 knots backing
southeast after midnight. waves calm to 2 feet. 
.wednesday...southeast winds less than 10 knots becoming east
5 to 15 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...east winds 10 to 20 knots veering southeast
after midnight. waves building to 3 to 6 feet occasionally to
8 feet. 
.thursday...east winds 15 to 25 knots becoming southeast 20 to
30 knots. rain showers likely. waves building to 8 to 11 feet
occasionally to 14 feet. 
.friday...southwest winds 20 to 30 knots becoming west 15 to
25 knots. a chance of rain showers. waves subsiding to 5 to
8 feet occasionally to 10 feet. 

$$