fzus63 kmqt 302059
glfls 
expires:202512310900;;512978

open lake forecast for lake superior
national weather service marquette mi
359 pm est tue dec 30 2025

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 of 28.7 inches retrogrades from eastern quebec toward hudson 
bay through tonight as it strengthens to 28.3 inches. meanwhile a 
30.7 inch ridge will build from the canadian prairies into the upper 
mississippi valley wednesday into thursday while weakening to 30.2 
inches. this configuration will persist into friday.



lsz162-310900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
359 pm est tue dec 30 2025 /259 pm cst tue dec 30 2025/

.late this afternoon...northwest winds 5 to 15 knots. snow
showers. waves calm to 2 feet. 
.tonight...north winds 10 to 20 knots backing northwest by
midnight, then increasing to 15 to 25 knots late. a chance of
snow showers. waves building to 1 to 3 feet. 
.wednesday...northwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. a slight chance of snow showers in the
morning. waves building to 3 to 5 feet occasionally to 7 feet. 
.wednesday night...northwest winds 20 to 30 knots diminishing to
15 to 25 knots by midnight. waves subsiding to 2 to 4 feet. 
.thursday...west winds 15 to 25 knots. a chance of snow showers.
waves 2 to 4 feet. 
.thursday night...west winds 15 to 25 knots. waves subsiding to
1 to 3 feet, then building to 2 to 4 feet. 
.friday...northwest winds 15 to 25 knots backing west in the
afternoon. waves building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.friday night...northwest winds 10 to 20 knots. waves subsiding
to calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots. waves calm to 2 feet. 
.sunday...northwest winds 5 to 15 knots increasing to 10 to
20 knots. a chance of snow showers. waves calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 302059
glfls 
expires:202512310900;;512979

open lake forecast for lake superior
national weather service marquette mi
359 pm est tue dec 30 2025

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 of 28.7 inches retrogrades from eastern quebec toward hudson 
bay through tonight as it strengthens to 28.3 inches. meanwhile a 
30.7 inch ridge will build from the canadian prairies into the upper 
mississippi valley wednesday into thursday while weakening to 30.2 
inches. this configuration will persist into friday.



lsz263-310900-
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-
359 pm est tue dec 30 2025

...heavy freezing spray warning in effect from wednesday morning
through thursday evening...

.late this afternoon...north winds 5 to 15 knots. snow showers
likely. waves calm to 2 feet. 
.tonight...north winds 10 to 20 knots becoming northwest 15 to
25 knots late. a chance of snow showers. waves building to 3 to
5 feet occasionally to 7 feet. 
.wednesday...northwest winds 20 to 30 knots. a chance of snow
showers in the morning. heavy freezing spray. waves building to
5 to 8 feet occasionally to 10 feet. 
.wednesday night...northwest winds to 30 knots with a few gale
force gusts to 35 knots possible diminishing to 20 to 30 knots by
midnight. heavy freezing spray. waves subsiding to 4 to 8 feet
occasionally to 10 feet. 
.thursday...west winds 20 to 30 knots. heavy freezing spray. a
chance of snow showers in the afternoon. waves 5 to 8 feet
occasionally to 10 feet. 
.thursday night...west winds 20 to 30 knots veering northwest
after midnight. freezing spray. waves subsiding to 4 to 7 feet
occasionally to 9 feet. 
.friday...northwest winds 20 to 30 knots. heavy freezing spray in
the morning. waves subsiding to 3 to 6 feet occasionally to
8 feet. 
.friday night...northwest winds 20 to 30 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 2 to 4 feet. 
.saturday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 
.sunday...northwest winds 5 to 15 knots. waves calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$