fzus63 kmqt 300301
glfls 
expires:202512300900;;470328

open lake forecast for lake superior
national weather service marquette mi
1000 pm est mon dec 29 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 was over quebec this evening with a 30.5 inch ridge 
over the plains. the low will continue to lift north and then 
retrograde westward to the hudson bay on tuesday night into 
wednesday. as the ridge slides southeast it will extend a 30.1 inch 
ridge over lake superior on tuesday, before a 29.9 inch trough 
builds over the lake on tuesday night. the low will remain over the 
hudson bay through the rest of the week extending 29.8 inch 
troughing southwest over lake superior.



lsz162-300900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm est mon dec 29 2025 /900 pm cst mon dec 29 2025/

.rest of tonight...northwest winds 15 to 25 knots diminishing to
10 to 20 knots late. a slight chance of snow showers after
midnight. waves 3 to 6 feet occasionally to 8 feet subsiding to
calm to 2 feet. 
.tuesday...west winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. snow showers likely. waves calm to
2 feet. 
.tuesday night...northwest winds 15 to 25 knots. a slight chance
of snow showers. waves building to 3 to 5 feet occasionally to
7 feet. 
.wednesday...northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. a slight chance of snow showers in the
morning. waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet. 
.wednesday night...northwest gales to 35 knots. waves 3 to 5 feet
occasionally to 7 feet. 
.thursday...west winds 20 to 30 knots. heavy freezing spray.
waves 3 to 5 feet occasionally to 7 feet. 
.thursday night...west winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. waves subsiding to 1 to 3 feet. 
.friday...west winds 10 to 20 knots veering northwest. waves
subsiding to calm to 2 feet. 
.saturday...west winds 5 to 15 knots becoming southwest 10 to
20 knots. waves calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 300301
glfls 
expires:202512300900;;470329

open lake forecast for lake superior
national weather service marquette mi
1000 pm est mon dec 29 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 was over quebec this evening with a 30.5 inch ridge 
over the plains. the low will continue to lift north and then 
retrograde westward to the hudson bay on tuesday night into 
wednesday. as the ridge slides southeast it will extend a 30.1 inch 
ridge over lake superior on tuesday, before a 29.9 inch trough 
builds over the lake on tuesday night. the low will remain over the 
hudson bay through the rest of the week extending 29.8 inch 
troughing southwest over lake superior.



lsz263-300900-
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 est mon dec 29 2025

.rest of tonight...northwest winds 20 to 30 knots diminishing to
15 to 25 knots by midnight. freezing spray late in the evening.
waves 5 to 8 feet occasionally to 10 feet subsiding to 2 to
4 feet. 
.tuesday...northwest winds 10 to 20 knots. a chance of snow
showers in the morning, then snow showers likely in the
afternoon. waves subsiding to 1 to 3 feet. 
.tuesday night...north winds 10 to 20 knots increasing to 15 to
25 knots by midnight, then becoming northwest 20 to 30 knots
late. a chance of snow showers. freezing spray after midnight.
waves building to 4 to 7 feet occasionally to 9 feet. 
.wednesday...northwest winds 20 to 30 knots increasing to gales
to 35 knots in the afternoon. a slight chance of snow showers in
the morning. heavy freezing spray. waves building to 4 to 8 feet
occasionally to 10 feet. 
.wednesday night...northwest gales to 35 knots. heavy freezing
spray. waves building to 6 to 9 feet occasionally to 11 feet. 
.thursday...northwest gales to 40 knots becoming west gales to
35 knots in the afternoon. heavy freezing spray. waves building
to 6 to 10 feet occasionally to 13 feet. 
.thursday night...west gales to 35 knots becoming northwest 20 to
30 knots after midnight. freezing spray. waves subsiding to 4 to
7 feet occasionally to 9 feet. 
.friday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. freezing spray. waves subsiding to 1 to 3 feet. 
.saturday...northwest winds 5 to 15 knots becoming southwest
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.

$$