fzus63 kmqt 111500
glfls 
expires:202512112100;;394463

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 11 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...

as a 29.1 inch low pushes farther into the maritime provinces this 
morning, broad 30.1 inch ridging weakens to 30.0 inches while moving 
over the mississippi valley. this ridge then moves over the great 
lakes friday morning before a trough quickly swings south from 
northern ontario, deepening from 29.9 inches to 29.7 inches through 
the afternoon to evening hours of friday. as this low exits to the 
east saturday, a 30.6 inch high settles over the dakotas saturday 
evening. this high builds to 30.7 inches over illinois sunday 
evening and towards the virginias by monday morning. in its wake, a 
29.9 inch trough will pass over lake superior monday afternoon 
associated with a 29.7 inch low over hudson bay. 30.1 inch ridging 
resumes over the lake monday night into tuesday ahead of a 29.2 inch 
low moving into manitoba tuesday afternoon.



lsz162-112100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est thu dec 11 2025 /900 am cst thu dec 11 2025/

.rest of today...northwest winds 5 to 15 knots backing west.
waves calm to 2 feet. 
.tonight...west winds 5 to 15 knots. waves calm to 2 feet. 
.friday...west winds 10 to 20 knots becoming northwest 20 to
30 knots by mid afternoon. snow showers in the morning, then a
chance of snow showers in the afternoon. waves building to 3 to
5 feet occasionally to 7 feet. 
.friday night...northwest gales to 35 knots. a chance of snow
showers. heavy freezing spray after midnight. waves building to
3 to 6 feet occasionally to 8 feet. 
.saturday...northwest winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. a chance of snow showers. waves 3 to
6 feet occasionally to 8 feet. 
.saturday night...northwest gales to 35 knots diminishing to
20 to 30 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
5 to 8 feet occasionally to 10 feet. 
.monday...west winds 20 to 30 knots becoming southwest 5 to
15 knots. waves subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 111500
glfls 
expires:202512112100;;394464

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 11 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...

as a 29.1 inch low pushes farther into the maritime provinces this 
morning, broad 30.1 inch ridging weakens to 30.0 inches while moving 
over the mississippi valley. this ridge then moves over the great 
lakes friday morning before a trough quickly swings south from 
northern ontario, deepening from 29.9 inches to 29.7 inches through 
the afternoon to evening hours of friday. as this low exits to the 
east saturday, a 30.6 inch high settles over the dakotas saturday 
evening. this high builds to 30.7 inches over illinois sunday 
evening and towards the virginias by monday morning. in its wake, a 
29.9 inch trough will pass over lake superior monday afternoon 
associated with a 29.7 inch low over hudson bay. 30.1 inch ridging 
resumes over the lake monday night into tuesday ahead of a 29.2 inch 
low moving into manitoba tuesday afternoon.



lsz263-112100-
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 am est thu dec 11 2025

.rest of today...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...west winds 5 to 15 knots. waves calm to 2 feet. 
.friday...west winds 5 to 15 knots increasing to 15 to 25 knots.
a chance of snow showers in the morning, then snow showers 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 gales to 35 knots. heavy freezing spray. a
chance of snow showers. waves subsiding to 5 to 8 feet
occasionally to 10 feet. 
.saturday night...north gales to 35 knots diminishing to 20 to
30 knots after midnight. a chance of snow showers in the evening.
heavy freezing spray. waves subsiding to 3 to 6 feet occasionally
to 8 feet. 
.sunday...northwest winds 15 to 25 knots becoming southwest gales
to 40 knots. freezing spray. a chance of snow showers. waves
subsiding to calm to 2 feet, then building to 7 to 10 feet
occasionally to 13 feet. 
.monday...west gales to 35 knots becoming northwest 10 to
20 knots. freezing spray. waves subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$