fzus63 kmqt 312101
glfls 
expires:202601010900;;570062

open lake forecast for lake superior
national weather service marquette mi
400 pm est wed dec 31 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 weakening 28.3 inch low continues retrograding over hudson bay 
the rest of this afternoon through tonight, a weakening 30.5 inch 
ridge builds from the canadian prairies into the upper midwest. the 
ridge dwindles to 30.0 inches by thursday, but the pattern remains 
persistent into friday. weak ridging of 30.0 inches eventually 
pushes into lake superior by saturday, before the parent high of 
30.3 inches moves into the upper great lakes by sunday. in its wake, 
a weakening 29.8 inch low moves through the upper great lakes on 
monday.



lsz162-010900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est wed dec 31 2025 /300 pm cst wed dec 31 2025/

.late this afternoon...northwest winds 20 to 30 knots. scattered
snow showers. waves 3 to 6 feet occasionally to 8 feet. 
.tonight...northwest winds 20 to 30 knots. waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.thursday...west winds 15 to 25 knots. scattered snow showers.
waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.thursday night...west winds 15 to 25 knots. a slight chance of
snow showers in the evening. waves subsiding to 1 to 3 feet. 
.friday...west winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. waves 1 to 3 feet. 
.friday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots becoming west 10 to
20 knots in the afternoon. a chance of snow showers. waves calm
to 2 feet. 
.saturday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves calm to 2 feet. 
.sunday...west winds 5 to 15 knots becoming southwest 10 to
20 knots. a chance of snow showers. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots. waves calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 312101
glfls 
expires:202601010900;;570063

open lake forecast for lake superior
national weather service marquette mi
400 pm est wed dec 31 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 weakening 28.3 inch low continues retrograding over hudson bay 
the rest of this afternoon through tonight, a weakening 30.5 inch 
ridge builds from the canadian prairies into the upper midwest. the 
ridge dwindles to 30.0 inches by thursday, but the pattern remains 
persistent into friday. weak ridging of 30.0 inches eventually 
pushes into lake superior by saturday, before the parent high of 
30.3 inches moves into the upper great lakes by sunday. in its wake, 
a weakening 29.8 inch low moves through the upper great lakes on 
monday.



lsz263-010900-
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 wed dec 31 2025

...heavy freezing spray warning in effect through thursday
evening...

.late this afternoon...northwest winds to 30 knots with a few
gale force gusts to 35 knots possible. heavy freezing spray.
scattered snow showers. waves 5 to 9 feet occasionally to
11 feet. 
.tonight...northwest winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 20 to 30 knots by
midnight. heavy freezing spray. scattered snow showers. waves
subsiding to 5 to 8 feet occasionally to 10 feet. 
.thursday...northwest winds 20 to 30 knots backing west. heavy
freezing spray. scattered snow showers. waves building to 5 to
9 feet occasionally to 11 feet. 
.thursday night...west winds 20 to 30 knots veering northwest
late. freezing spray. a chance of snow showers. waves subsiding
to 4 to 7 feet occasionally to 9 feet. 
.friday...northwest winds 20 to 30 knots becoming west 15 to
25 knots in the afternoon. freezing spray. waves subsiding to
3 to 6 feet occasionally to 8 feet. 
.friday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 1 to 3 feet. 
.saturday...northwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. a chance of snow showers. waves
subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.saturday night...northwest winds 10 to 20 knots. waves 1 to
3 feet. 
.sunday...northwest winds 5 to 15 knots backing southwest. a
chance of snow showers. waves subsiding to calm to 2 feet. 
.monday...west winds 5 to 15 knots. waves calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$