fzus63 kmqt 102137
glfls 
expires:202512110900;;356636

open lake forecast for lake superior
national weather service marquette mi
437 pm est wed dec 10 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...

troughing continues to gradually weaken to 29.8 inches over lake 
superior this evening as a 29.2 inch low over lake ontario tracks to 
southern quebec at 29.1 inches by tonight. this will allow 30.2 inch 
high pressure to rebuild over the northern plains while extending 
weak ridging over lake superior through thursday. ridging breaks 
down temporarily on friday as a 29.8 inch trough drops over the lake 
from northern ontario, but ridging quickly rebuilds as 30.7 inch 
high pressure over the northern plains extends back into the great 
lakes this weekend.



lsz162-110900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
437 pm est wed dec 10 2025 /337 pm cst wed dec 10 2025/

.late this afternoon...northwest winds 15 to 25 knots. waves 2 to
4 feet. 
.tonight...northwest winds 15 to 25 knots diminishing to 10 to
20 knots by midnight. waves subsiding to calm to 2 feet. 
.thursday...northwest winds 5 to 15 knots backing west. waves
calm to 2 feet. 
.thursday night...southwest winds 5 to 15 knots veering west by
midnight. a slight chance of snow showers after midnight. waves
calm to 2 feet. 
.friday...west winds 10 to 20 knots becoming northwest 15 to
25 knots in the afternoon. snow showers. waves building to 3 to
5 feet occasionally to 7 feet. 
.friday night...northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. a chance of snow showers. waves building
to 3 to 6 feet occasionally to 8 feet. 
.saturday...northwest winds 20 to 30 knots. waves subsiding to
2 to 4 feet. 
.saturday night...northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. waves subsiding to 1 to 3 feet. 
.sunday...northwest winds 10 to 20 knots becoming southwest gales
to 35 knots. waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet. 
.monday...west winds 20 to 30 knots diminishing to 10 to
20 knots. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 102137
glfls 
expires:202512110900;;356637

open lake forecast for lake superior
national weather service marquette mi
437 pm est wed dec 10 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...

troughing continues to gradually weaken to 29.8 inches over lake 
superior this evening as a 29.2 inch low over lake ontario tracks to 
southern quebec at 29.1 inches by tonight. this will allow 30.2 inch 
high pressure to rebuild over the northern plains while extending 
weak ridging over lake superior through thursday. ridging breaks 
down temporarily on friday as a 29.8 inch trough drops over the lake 
from northern ontario, but ridging quickly rebuilds as 30.7 inch 
high pressure over the northern plains extends back into the great 
lakes this weekend.



lsz263-110900-
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-
437 pm est wed dec 10 2025

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

note, wave height forecasts are for ice free areas.

$$