fzus63 kmqt 272102
glfls 
expires:202512280900;;333971

open lake forecast for lake superior
national weather service marquette mi
401 pm est sat dec 27 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...

a 30.2 inch ridge extends into the eastern lakes today while a 29.7 
inch low develops over the plains. this low deepens to 28.9 inches 
as it lifts to near the straits of mackinac by monday morning. 
meanwhile, a strong high pressure of at least 30.6 inches will 
spread across the great plains as the low lifts into quebec. a 29.8 
inch trough dives southeast into the upper great lakes late tuesday.
.



lsz162-280900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm est sat dec 27 2025 /301 pm cst sat dec 27 2025/

...gale warning in effect from sunday evening through monday
evening...
...heavy freezing spray warning in effect from sunday evening
through late monday night...

.late this afternoon...south winds 10 to 20 knots. a chance of
rain showers. waves calm to 2 feet. 
.tonight...south winds 5 to 15 knots backing north late. a slight
chance of rain showers. waves calm to 2 feet. 
.sunday...northeast winds 5 to 15 knots becoming north 10 to
20 knots by late morning, then increasing to 20 to 30 knots by
mid afternoon. a chance of rain showers in the morning, then snow
showers, possibly mixed with rain in the afternoon. waves
building to 3 to 6 feet occasionally to 8 feet. 
.sunday night...north gales to 45 knots increasing to gales to
45 knots with a few storm force gusts to 50 knots possible late.
heavy freezing spray. snow showers in the evening. snow showers
likely after midnight. waves building to 10 to 14 feet
occasionally to 18 feet. 
.monday...north gales to 45 knots becoming northwest gales to
40 knots in the afternoon. a slight chance of snow showers in the
morning. heavy freezing spray. waves subsiding to 4 to 7 feet
occasionally to 9 feet. 
.monday night...northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. freezing spray in the evening. waves
subsiding to 1 to 3 feet. 
.tuesday...west winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. snow showers likely. waves subsiding to calm to
2 feet, then building to 1 to 3 feet. 
.tuesday night...northwest winds 20 to 30 knots. waves building
to 2 to 4 feet. 
.wednesday...northwest winds 20 to 30 knots. waves subsiding to
1 to 3 feet, then building to 2 to 4 feet. 
.thursday...west winds 20 to 30 knots. waves subsiding to 1 to
3 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 272102
glfls 
expires:202512280900;;333972

open lake forecast for lake superior
national weather service marquette mi
401 pm est sat dec 27 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...

a 30.2 inch ridge extends into the eastern lakes today while a 29.7 
inch low develops over the plains. this low deepens to 28.9 inches 
as it lifts to near the straits of mackinac by monday morning. 
meanwhile, a strong high pressure of at least 30.6 inches will 
spread across the great plains as the low lifts into quebec. a 29.8 
inch trough dives southeast into the upper great lakes late tuesday.
.



lsz263-280900-
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-
401 pm est sat dec 27 2025

...storm warning in effect from sunday evening through monday
evening...
...heavy freezing spray warning in effect from late sunday night
through tuesday morning...

.late this afternoon...south winds 10 to 20 knots. a chance of
rain showers. waves 1 to 3 feet. 
.tonight...south winds 10 to 20 knots diminishing to 5 to
15 knots by midnight. patchy fog. a slight chance of rain
showers. waves building to 2 to 4 feet, then subsiding to calm to
2 feet. 
.sunday...northeast winds 5 to 15 knots increasing to 20 to
30 knots. a chance of rain showers in the morning, then rain and
snow showers in the afternoon. waves building to 3 to 6 feet
occasionally to 8 feet. 
.sunday night...north gales to 45 knots increasing to storm force
winds to 55 knots late. heavy freezing spray. snow showers. waves
building to 17 to 22 feet occasionally to 28 feet. 
.monday...north storm force winds to 55 knots diminishing to
gales to 45 knots in the afternoon. heavy freezing spray. a
chance of snow showers. waves subsiding to 10 to 14 feet
occasionally to 18 feet. 
.monday night...north gales to 40 knots becoming northwest 20 to
30 knots after midnight. freezing spray. waves subsiding to 3 to
6 feet occasionally to 8 feet. 
.tuesday...west winds 15 to 25 knots. a chance of snow showers in
the morning, then snow showers likely in the afternoon. waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet. 
.tuesday night...northwest winds 20 to 30 knots increasing to
gales to 35 knots after midnight. freezing spray. a chance of
snow showers. waves building to 5 to 8 feet occasionally to
10 feet. 
.wednesday...northwest gales to 35 knots diminishing to 20 to
30 knots. heavy freezing spray. waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 4 to 7 feet occasionally
to 9 feet. 
.thursday...northwest gales to 35 knots. heavy freezing spray.
waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$