fzus63 kmqt 300901
glfls 
expires:202512302100;;484564

open lake forecast for lake superior
national weather service marquette mi
400 am 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 29.0 inch low moves into eastern quebec this morning as 30.1 inch 
ridging overspreads the upper midwest. the low will continue to lift 
north and then retrograde westward to the hudson bay tonight into 
wednesday. as the aforementioned ridge slides southeast it will 
extend a 30.1 inch ridge over lake superior today, before a 29.9 
inch trough builds over the lake tonight. the low will remain over 
the hudson bay through the rest of the week extending 29.8 inch 
troughing southwest over lake superior.



lsz162-302100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am est tue dec 30 2025 /300 am cst tue dec 30 2025/

.early this morning...northwest winds 5 to 15 knots. waves 1 to
3 feet subsiding to calm to 2 feet. 
.today...west winds 5 to 15 knots veering northwest by mid
afternoon. patchy fog in the morning. a chance of snow showers in
the morning, then snow showers likely in the afternoon. waves
calm to 2 feet. 
.tonight...northwest winds 10 to 20 knots increasing to 15 to
25 knots by midnight. a chance of snow showers, possibly mixed
with freezing rain. waves building to 3 to 5 feet occasionally to
7 feet. 
.wednesday...northwest winds 15 to 25 knots increasing to 20 to
30 knots. a slight chance of snow showers in the morning. waves
3 to 5 feet occasionally to 7 feet. 
.wednesday night...northwest winds 15 to 25 knots. waves 3 to
5 feet occasionally to 7 feet. 
.thursday...west winds 15 to 25 knots. a chance of snow showers
in the afternoon. waves subsiding to 2 to 4 feet. 
.thursday night...west winds 15 to 25 knots. waves subsiding to
1 to 3 feet. 
.friday...west winds 10 to 20 knots veering northwest. waves
subsiding to calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots increasing to 10 to
20 knots. waves calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 300901
glfls 
expires:202512302100;;484565

open lake forecast for lake superior
national weather service marquette mi
400 am 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 29.0 inch low moves into eastern quebec this morning as 30.1 inch 
ridging overspreads the upper midwest. the low will continue to lift 
north and then retrograde westward to the hudson bay tonight into 
wednesday. as the aforementioned ridge slides southeast it will 
extend a 30.1 inch ridge over lake superior today, before a 29.9 
inch trough builds over the lake tonight. the low will remain over 
the hudson bay through the rest of the week extending 29.8 inch 
troughing southwest over lake superior.



lsz263-302100-
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 dec 30 2025

.early this morning...northwest winds 10 to 20 knots. waves 3 to
5 feet occasionally to 7 feet. 
.today...northwest winds 10 to 20 knots diminishing to 5 to
15 knots by late morning, then veering north by mid afternoon.
patchy dense fog in the morning. a chance of snow showers in the
morning, then snow showers likely in the afternoon. waves
subsiding to calm to 2 feet. 
.tonight...north winds 10 to 20 knots increasing to 15 to
25 knots by midnight, then backing northwest late. a chance of
snow showers. waves building to 3 to 6 feet occasionally to
8 feet. 
.wednesday...northwest winds 20 to 30 knots. heavy freezing
spray. a chance of snow showers. waves building to 4 to 7 feet
occasionally to 9 feet. 
.wednesday night...northwest winds 20 to 30 knots. heavy freezing
spray. waves building to 4 to 8 feet occasionally to 10 feet. 
.thursday...northwest winds 20 to 30 knots backing west in the
afternoon. 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. a chance of snow showers. waves
subsiding to 4 to 7 feet occasionally to 9 feet. 
.friday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. waves subsiding to 1 to 3 feet. 
.saturday...northwest winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$