fzus63 kmqt 240901
glfls 
expires:202602242100;;165863

open lake forecast for lake superior
national weather service marquette mi
400 am est tue feb 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 low pressure system strengthening to 29.3 inches will move from 
northern mn across lake superior though tonight. weak ridging then 
builds over lake superior at 29.9 inches wednesday night into 
thursday. a strong clipper averaging 29.2 inches moves across 
ontario friday night into saturday, sending a strong cold front 
across the lake with a 30.7 inch high building over the lake by 
sunday.



lsz162-242100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am est tue feb 24 2026 /300 am cst tue feb 24 2026/

.early this morning...south winds 20 to 30 knots. a chance of
snow showers. waves 3 to 6 feet occasionally to 8 feet. 
.today...south winds to 30 knots with a few gale force gusts to
35 knots possible becoming southwest 20 to 30 knots by late
morning, then veering west by mid afternoon. freezing spray in
the morning. snow in the morning, then a chance of snow in the
afternoon. waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 2 to 4 feet. 
.tonight...northwest winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible by midnight,
then diminishing to 20 to 30 knots late. a slight chance of snow
showers in the evening. heavy freezing spray. waves building to
3 to 6 feet occasionally to 8 feet. 
.wednesday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then becoming west 5 to 15 knots by mid
afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...northwest winds 5 to 15 knots backing west
after midnight. waves calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. waves building to 1 to 3 feet. 
.thursday night...southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves subsiding to calm to 2 feet,
then building to 2 to 4 feet. 
.friday...southwest gales to 40 knots veering northwest. heavy
freezing spray. waves building to 6 to 9 feet occasionally to
11 feet, then subsiding to 4 to 7 feet occasionally to 9 feet. 
.saturday...northwest winds 20 to 30 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 240901
glfls 
expires:202602242100;;165864

open lake forecast for lake superior
national weather service marquette mi
400 am est tue feb 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 low pressure system strengthening to 29.3 inches will move from 
northern mn across lake superior though tonight. weak ridging then 
builds over lake superior at 29.9 inches wednesday night into 
thursday. a strong clipper averaging 29.2 inches moves across 
ontario friday night into saturday, sending a strong cold front 
across the lake with a 30.7 inch high building over the lake by 
sunday.



lsz263-242100-
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-
400 am est tue feb 24 2026

...heavy freezing spray warning in effect until 1 pm est this
afternoon...

.early this morning...south winds 20 to 30 knots. heavy freezing
spray. a slight chance of snow showers. waves 3 to 6 feet
occasionally to 8 feet building to 4 to 7 feet occasionally to
9 feet. 
.today...south winds to 30 knots with a few gale force gusts to
35 knots possible becoming southwest 20 to 30 knots by late
morning, then becoming west 15 to 25 knots by mid afternoon.
freezing spray. snow in the morning. a chance of snow in the
afternoon. waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet. 
.tonight...northwest winds 15 to 25 knots increasing to 20 to
30 knots by midnight. heavy freezing spray. a chance of snow
showers. waves building to 5 to 9 feet occasionally to 11 feet. 
.wednesday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then backing west by mid afternoon.
heavy freezing spray in the morning. a chance of snow showers in
the morning. waves subsiding to 1 to 3 feet. 
.wednesday night...northwest winds 5 to 15 knots backing west
after midnight. waves subsiding to calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. waves building to 1 to 3 feet. 
.thursday night...southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet. 
.friday...southwest gales to 40 knots veering west. heavy
freezing spray. waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 9 to 12 feet occasionally to 15 feet. 
.saturday...northwest winds 20 to 30 knots becoming north 15 to
25 knots. heavy freezing spray. waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet. 

note, wave height forecasts are for ice free areas.

$$