fzus63 kmqt 132101
glfls 
expires:202512140900;;528710

open lake forecast for lake superior
national weather service marquette mi
400 pm est sat dec 13 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...

ridging builds to 30.4 inches over lake superior tonight into sunday 
morning as a 29.7 inch low departs into quebec and 30.7 high 
pressure shifts east from central canada and the northern plains 
into the upper midwest. a 29.9 inch trough moves across the lake 
monday morning as the high settles into the southeastern u.s. a 30.0 
inch ridge then crosses lake superior monday night followed by a 
trough of at least 29.3 inches tuesday night as a 29.1 inch low 
crosses northern ontario. weak ridging of 29.9 inches returns over 
lake superior on wednesday before a 29.0 inch clipper low approaches 
on thursday.



lsz162-140900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est sat dec 13 2025 /300 pm cst sat dec 13 2025/

...heavy freezing spray warning in effect until 1 am est
/midnight cst/ sunday...

.late this afternoon...northwest winds to 30 knots with a few
gale force gusts to 35 knots possible. heavy freezing spray.
isolated snow showers. waves 4 to 7 feet occasionally to 9 feet. 
.tonight...northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. heavy freezing spray in the evening. isolated snow
showers. waves subsiding to 2 to 4 feet. 
.sunday...northwest winds 10 to 20 knots backing west by late
morning, then becoming southwest 15 to 25 knots by mid afternoon.
waves subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet. 
.sunday night...southwest winds 20 to 30 knots increasing to
30 knots with a few gale force gusts to 35 knots possible by
midnight, then veering west late. freezing spray. a chance of
snow showers. waves building to 5 to 9 feet occasionally to
11 feet. 
.monday...west winds 15 to 25 knots becoming northwest 5 to
15 knots in the afternoon. waves subsiding to calm to 2 feet. 
.monday night...northwest winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. waves calm to 2 feet. 
.tuesday...southwest gales to 35 knots. waves building to 6 to
9 feet occasionally to 11 feet. 
.tuesday night...west gales to 35 knots diminishing to 20 to
30 knots after midnight. waves subsiding to 2 to 4 feet. 
.wednesday...west winds 10 to 20 knots becoming south gales to
35 knots. rain and snow showers likely. waves subsiding to calm
to 2 feet, then building to 6 to 9 feet occasionally to 11 feet. 
.thursday...west gales to 40 knots veering northwest. freezing
spray. a chance of snow showers, possibly mixed with rain. waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 132101
glfls 
expires:202512140900;;528711

open lake forecast for lake superior
national weather service marquette mi
400 pm est sat dec 13 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...

ridging builds to 30.4 inches over lake superior tonight into sunday 
morning as a 29.7 inch low departs into quebec and 30.7 high 
pressure shifts east from central canada and the northern plains 
into the upper midwest. a 29.9 inch trough moves across the lake 
monday morning as the high settles into the southeastern u.s. a 30.0 
inch ridge then crosses lake superior monday night followed by a 
trough of at least 29.3 inches tuesday night as a 29.1 inch low 
crosses northern ontario. weak ridging of 29.9 inches returns over 
lake superior on wednesday before a 29.0 inch clipper low approaches 
on thursday.



lsz263-140900-
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 sat dec 13 2025

...heavy freezing spray warning in effect through sunday
morning...

.late this afternoon...northwest winds 20 to 30 knots. heavy
freezing spray. numerous snow showers. waves 5 to 8 feet
occasionally to 10 feet. 
.tonight...northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. heavy freezing spray. scattered snow showers.
waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.sunday...northwest winds 10 to 20 knots backing west by late
morning, then becoming southwest 15 to 25 knots by mid afternoon.
isolated snow showers in the morning. waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet. 
.sunday night...southwest winds 20 to 30 knots increasing to
30 knots with a few gale force gusts to 40 knots possible by
midnight. freezing spray. a chance of snow showers. waves
building to 7 to 10 feet occasionally to 13 feet. 
.monday...west gales to 35 knots becoming northwest 10 to
20 knots in the afternoon. freezing spray in the morning. a
slight chance of snow showers in the morning. waves subsiding to
1 to 3 feet. 
.monday night...northwest winds 5 to 15 knots becoming southwest
15 to 25 knots after midnight. waves subsiding to calm to 2 feet.
.tuesday...southwest gales to 40 knots. waves building to 7 to
10 feet occasionally to 13 feet. 
.tuesday night...west gales to 40 knots. waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet. 
.wednesday...west winds 10 to 20 knots becoming south gales to
35 knots. rain and snow showers likely. waves subsiding to 1 to
3 feet, then building to 7 to 10 feet occasionally to 13 feet. 
.thursday...west gales to 45 knots veering northwest. freezing
spray. rain showers likely. a chance of snow showers. waves
building to 11 to 15 feet occasionally to 19 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet. 

note, wave height forecasts are for ice free areas.

$$