fzus63 kmqt 100301
glfls 
expires:202512100900;;309963

open lake forecast for lake superior
national weather service marquette mi
1000 pm est tue dec 9 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 29.5 inch trough of low pressure will persist over lake superior 
through wednesday morning as a 29.2 inch low currently over north 
dakota crosses southern lake michigan tonight. 29.6 to 29.7 inch 
troughing lingers over lake superior through wednesday as the low 
moves into southern quebec at 29.1 inches by wednesday night. this 
will allow 30.3 inch high pressure to rebuild over the northern 
plains late wednesday through thursday while extending weak ridging 
over lake superior. ridging breaks down slightly early friday, but 
quickly rebuilds as 30.5 inch high pressure over the northern plains 
extends back into the great lakes this weekend.



lsz162-100900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm est tue dec 9 2025 /900 pm cst tue dec 9 2025/

.rest of tonight...east winds 15 to 25 knots becoming northeast
20 to 30 knots by midnight. a chance of snow. freezing spray
after midnight. waves 1 to 3 feet building to 6 to 9 feet
occasionally to 11 feet. 
.wednesday...north winds 20 to 30 knots diminishing to 15 to
25 knots by late morning, then backing northwest by mid
afternoon. freezing spray in the morning. waves subsiding to 2 to
4 feet. 
.wednesday night...northwest winds 10 to 20 knots. waves
subsiding to calm to 2 feet. 
.thursday...northwest winds 5 to 15 knots backing west in the
afternoon. waves calm to 2 feet. 
.thursday night...west winds 5 to 15 knots increasing to 10 to
20 knots after midnight. a slight chance of snow showers after
midnight. waves calm to 2 feet. 
.friday...west winds 10 to 20 knots becoming northwest 20 to
30 knots in the afternoon. snow showers likely. waves building to
3 to 5 feet occasionally to 7 feet. 
.friday night...northwest winds 20 to 30 knots. waves building to
3 to 6 feet occasionally to 8 feet. 
.saturday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. waves subsiding to 1 to 3 feet. 
.sunday...northwest winds 10 to 20 knots backing southwest. a
chance of snow showers. waves subsiding to calm to 2 feet, then
building to 1 to 3 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 100301
glfls 
expires:202512100900;;309964

open lake forecast for lake superior
national weather service marquette mi
1000 pm est tue dec 9 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 29.5 inch trough of low pressure will persist over lake superior 
through wednesday morning as a 29.2 inch low currently over north 
dakota crosses southern lake michigan tonight. 29.6 to 29.7 inch 
troughing lingers over lake superior through wednesday as the low 
moves into southern quebec at 29.1 inches by wednesday night. this 
will allow 30.3 inch high pressure to rebuild over the northern 
plains late wednesday through thursday while extending weak ridging 
over lake superior. ridging breaks down slightly early friday, but 
quickly rebuilds as 30.5 inch high pressure over the northern plains 
extends back into the great lakes this weekend.



lsz263-100900-
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 pm est tue dec 9 2025

...gale warning in effect from 4 am est wednesday through
wednesday morning...

.rest of tonight...east winds 10 to 20 knots becoming northeast
20 to 30 knots by midnight, then increasing to gales to 35 knots
late. a chance of snow. freezing spray after midnight. waves calm
to 2 feet building to 7 to 10 feet occasionally to 13 feet. 
.wednesday...north gales to 35 knots diminishing to 20 to
30 knots by late morning, then becoming northwest 15 to 25 knots
by mid afternoon. freezing spray in the morning. a slight chance
of snow showers in the morning. waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet. 
.wednesday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots by midnight, then veering north late. waves
subsiding to 2 to 4 feet. 
.thursday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. waves subsiding to calm to 2 feet. 
.thursday night...northwest winds 5 to 15 knots backing west
after midnight. a slight chance of snow showers after midnight.
waves calm to 2 feet. 
.friday...west winds 10 to 20 knots increasing to 20 to 30 knots
in the afternoon. a chance of snow showers in the morning, then
snow showers likely in the afternoon. freezing spray in the
afternoon. waves building to 4 to 7 feet occasionally to 9 feet. 
.friday night...northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. freezing spray. a chance of snow
showers. waves building to 6 to 9 feet occasionally to 11 feet. 
.saturday...northwest winds 20 to 30 knots. heavy freezing spray.
waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.sunday...northwest winds 15 to 25 knots backing southwest. a
chance of snow showers. waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$