fzus63 kmqt 240801
glfls 
expires:202604242000;;898514

open lake forecast for lake superior
national weather service marquette mi
401 am edt fri apr 24 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 29.4 inch low over northern lake winnipeg is sending a 29.6 inch 
trough across lake superior today. into saturday, the parent low 
weakens considerably as remnant troughing moves south and 30.0 inch 
ridging builds over lake superior by late saturday. this ridge 
builds to 30.1 inches by late sunday and persists into early monday. 
meanwhile, a 29.3 inch colorado low develops, moving towards the 
upper midwest by early monday, causing pressure over lake superior 
to fall rapidly toward 29.7 inches by mid-monday. lake superior 
pressure continues to fall as this 29.3 inch low reaches mn/wi by 
late monday and lake superior by early tuesday, causing pressure 
over the lake to remain low near 29.3 throughout tuesday. this low 
lifts north into ontario wednesday morning, and lake superior 
pressures increase to 29.8 inches by wednesday midday.



lsz162-242000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt fri apr 24 2026 /301 am cdt fri apr 24 2026/

.early this morning...northeast winds 10 to 20 knots. rain
showers and a slight chance of thunderstorms. waves 3 to 5 feet
occasionally to 7 feet. 
.today...west winds 10 to 20 knots diminishing to 5 to 15 knots
late. a chance of rain showers through early afternoon. waves
subsiding to 2 to 4 feet. 
.tonight...northwest winds 5 to 15 knots veering north after
midnight. waves subsiding to calm to 2 feet. 
.saturday...north winds 5 to 15 knots veering south in the
afternoon, then backing east late. waves calm to 2 feet. 
.saturday night...east winds 5 to 15 knots backing northeast
after midnight. a slight chance of rain showers after midnight.
waves calm to 2 feet. 
.sunday...northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.sunday night...northeast winds 10 to 20 knots. waves building to
3 to 5 feet occasionally to 7 feet. 
.monday...east winds 20 to 30 knots backing northeast. a chance
of rain showers, then rain showers. waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet. 
.tuesday...west gales to 35 knots diminishing to 15 to 25 knots.
a chance of rain showers. waves subsiding to 1 to 3 feet. 

$$

fzus63 kmqt 240801
glfls 
expires:202604242000;;898515

open lake forecast for lake superior
national weather service marquette mi
401 am edt fri apr 24 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 29.4 inch low over northern lake winnipeg is sending a 29.6 inch 
trough across lake superior today. into saturday, the parent low 
weakens considerably as remnant troughing moves south and 30.0 inch 
ridging builds over lake superior by late saturday. this ridge 
builds to 30.1 inches by late sunday and persists into early monday. 
meanwhile, a 29.3 inch colorado low develops, moving towards the 
upper midwest by early monday, causing pressure over lake superior 
to fall rapidly toward 29.7 inches by mid-monday. lake superior 
pressure continues to fall as this 29.3 inch low reaches mn/wi by 
late monday and lake superior by early tuesday, causing pressure 
over the lake to remain low near 29.3 throughout tuesday. this low 
lifts north into ontario wednesday morning, and lake superior 
pressures increase to 29.8 inches by wednesday midday.



lsz263-242000-
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 am edt fri apr 24 2026

.early this morning...southeast winds to 30 knots with a few gale
force gusts to 35 knots possible. rain showers and a slight
chance of thunderstorms. waves 7 to 10 feet occasionally to
13 feet. 
.today...west winds to 30 knots with a few gale force gusts to
35 knots possible diminishing to 10 to 20 knots. rain showers
through early afternoon, then a slight chance of rain showers by
mid afternoon. waves building to 8 to 11 feet occasionally to
14 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. 
.tonight...northwest winds 10 to 20 knots becoming north 5 to
15 knots after midnight, then backing northwest late. waves
subsiding to calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots backing southwest in
the afternoon, then backing south late. waves 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 backing northeast by mid
afternoon. waves calm to 2 feet. 
.sunday night...east winds 5 to 15 knots. waves building to 1 to
3 feet. 
.monday...east gales to 35 knots. a chance of rain showers, then
rain showers. waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 8 to 11 feet occasionally to 14 feet. 
.tuesday...west gales to 35 knots. a chance of rain showers.
waves subsiding to 4 to 8 feet occasionally to 10 feet. 

$$