fzus63 kmqt 112101
glfls 
expires:202512120900;;410172

open lake forecast for lake superior
national weather service marquette mi
400 pm 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...

broad 30.1 inch ridging moves over the mississippi valley this 
evening before, then moving over the great lakes friday morning 
ahead of a trough from northern ontario. this trough deepens 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.



lsz162-120900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est thu dec 11 2025 /300 pm cst thu dec 11 2025/

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

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 112101
glfls 
expires:202512120900;;410173

open lake forecast for lake superior
national weather service marquette mi
400 pm 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...

broad 30.1 inch ridging moves over the mississippi valley this 
evening before, then moving over the great lakes friday morning 
ahead of a trough from northern ontario. this trough deepens 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.



lsz263-120900-
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 pm est thu dec 11 2025

...gale watch in effect from friday evening through sunday
morning...

.late this afternoon...northwest winds less than 10 knots. waves
calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots backing west by
midnight. waves calm to 2 feet. 
.friday...west winds 10 to 20 knots increasing to 20 to 30 knots.
a chance of snow showers in the morning, then snow showers in the
afternoon. waves building to 4 to 7 feet occasionally to 9 feet. 
.friday night...northwest gales to 35 knots. heavy freezing
spray. a chance of snow showers. waves building to 5 to 9 feet
occasionally to 11 feet. 
.saturday...northwest gales to 35 knots. heavy freezing spray. a
chance of snow showers. waves subsiding to 4 to 8 feet
occasionally to 10 feet. 
.saturday night...northwest gales to 35 knots veering north after
midnight. heavy freezing spray. a chance of snow showers. waves
subsiding to 3 to 6 feet occasionally to 8 feet. 
.sunday...northwest winds 15 to 25 knots backing west in the
afternoon. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 
.sunday night...southwest gales to 35 knots. a chance of snow
showers. freezing spray after midnight. waves 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. 
.tuesday...southwest gales to 40 knots veering west. waves
building to 5 to 9 feet occasionally to 11 feet. 

note, wave height forecasts are for ice free areas.

$$