fzus63 kmqt 230201
glfls 
expires:202604230800;;827782

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt wed apr 22 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...

30.0 inch high pressure shifts eastward over lake superior tonight 
while a 29.4 inch low deepens to 29.1 inches over montana. this low 
then moves into southern manitoba by thursday evening. this sends 
29.6 in troughing over lake superior thursday night into friday. as 
the parent low weakens to 29.9 inches saturday and remnant troughing 
moves south of the lower great lakes at 29.7 inches, 30.0 inch 
ridging will build over lake superior. by late sunday, this ridge 
builds to 30.1 inches. meanwhile, a 29.3 inch colorado low develops, 
moving towards the upper midwest by early monday, causing pressure 
over lake superior to begin to fall rapidly toward 29.5 by mid-
monday.



lsz162-230800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt wed apr 22 2026 /900 pm cdt wed apr 22 2026/

.rest of tonight...northeast winds 10 to 20 knots veering east
late. a chance of rain showers and a slight chance of
thunderstorms. waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.thursday...east winds 10 to 20 knots becoming northeast 15 to
25 knots late. rain showers likely and a slight chance of
thunderstorms by mid afternoon. waves building to 3 to 6 feet
occasionally to 8 feet. 
.thursday night...northeast winds 10 to 20 knots veering east
after midnight, then backing northeast late. rain showers and a
chance of thunderstorms. waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.friday...west winds 10 to 20 knots. rain showers likely through
early afternoon, then a chance of rain showers by mid afternoon.
waves subsiding to 2 to 4 feet. 
.friday night...northwest winds 10 to 20 knots backing west after
midnight. a slight chance of rain showers. waves subsiding to
calm to 2 feet. 
.saturday...west winds 10 to 20 knots backing south by mid
afternoon. waves calm to 2 feet. 
.saturday night...east winds 5 to 15 knots backing northeast
after midnight. waves calm to 2 feet. 
.sunday...northeast winds 5 to 15 knots increasing to 15 to
25 knots. waves building to 2 to 4 feet. 
.monday...northeast winds 15 to 25 knots becoming north 20 to
30 knots. a chance of rain showers. waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet. 

$$

fzus63 kmqt 230201
glfls 
expires:202604230800;;827783

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt wed apr 22 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...

30.0 inch high pressure shifts eastward over lake superior tonight 
while a 29.4 inch low deepens to 29.1 inches over montana. this low 
then moves into southern manitoba by thursday evening. this sends 
29.6 in troughing over lake superior thursday night into friday. as 
the parent low weakens to 29.9 inches saturday and remnant troughing 
moves south of the lower great lakes at 29.7 inches, 30.0 inch 
ridging will build over lake superior. by late sunday, this ridge 
builds to 30.1 inches. meanwhile, a 29.3 inch colorado low develops, 
moving towards the upper midwest by early monday, causing pressure 
over lake superior to begin to fall rapidly toward 29.5 by mid-
monday.



lsz263-230800-
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 wed apr 22 2026

.rest of tonight...east winds 10 to 20 knots increasing to 15 to
25 knots late. a chance of rain showers and a slight chance of
thunderstorms. waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.thursday...east winds 15 to 25 knots increasing to 20 to
30 knots late. a slight chance of showers and thunderstorms by
mid afternoon. waves building to 6 to 9 feet occasionally to
11 feet. 
.thursday night...southeast winds to 30 knots with a few gale
force gusts to 35 knots possible becoming east 20 to 30 knots
after midnight. rain showers and a chance of thunderstorms. waves
building to 8 to 11 feet occasionally to 14 feet. 
.friday...east winds 20 to 30 knots becoming west 15 to 25 knots
by mid afternoon. rain showers likely and a slight chance of
thunderstorms through early afternoon, then a chance of rain
showers by mid afternoon. waves subsiding to 5 to 8 feet
occasionally to 10 feet. 
.friday night...northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. a chance of rain showers. waves
subsiding to 1 to 3 feet. 
.saturday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves subsiding to calm to 2 feet. 
.saturday night...east winds 5 to 15 knots diminishing to less
than 10 knots after midnight. waves calm to 2 feet. 
.sunday...east winds 5 to 15 knots. waves building to 1 to
3 feet. 
.monday...east winds 15 to 25 knots backing north. a chance of
rain showers. waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. 

$$