fzus63 kmqt 091501
glfls 
expires:202512092100;;280788

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 29.6 inch low over lake superior this morning will move east into 
ontario this afternoon, but troughing over the lake will persist and 
deepen to 29.5 inches as a 29.3 inch low currently over southern 
saskatchewan crosses central lake michigan at 29.2 inches tonight. 
29.6 inch troughing lingers over lake superior into wednesday as the 
low moves into southern quebec at 29.2 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. this may break down slightly early friday, but 
30.5 inch ridging over the northern plains then extends back into 
the great lakes this weekend.



lsz162-092100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est tue dec 9 2025 /900 am cst tue dec 9 2025/

.rest of today...northwest winds 10 to 20 knots becoming west
5 to 15 knots by late morning, then backing south by mid
afternoon. a chance of snow showers in the afternoon. waves calm
to 2 feet. 
.tonight...east winds 10 to 20 knots becoming northeast 20 to
30 knots by midnight. snow showers likely in the evening, then a
chance of snow showers after midnight. freezing spray after
midnight. waves 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...northwest winds 10 to 20 knots backing west
after midnight. a chance of snow showers after midnight. waves
calm to 2 feet. 
.friday...northwest winds 20 to 30 knots. snow showers likely.
waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet. 
.saturday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 091501
glfls 
expires:202512092100;;280789

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 29.6 inch low over lake superior this morning will move east into 
ontario this afternoon, but troughing over the lake will persist and 
deepen to 29.5 inches as a 29.3 inch low currently over southern 
saskatchewan crosses central lake michigan at 29.2 inches tonight. 
29.6 inch troughing lingers over lake superior into wednesday as the 
low moves into southern quebec at 29.2 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. this may break down slightly early friday, but 
30.5 inch ridging over the northern plains then extends back into 
the great lakes this weekend.



lsz263-092100-
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 am est tue dec 9 2025

...gale warning in effect from late tonight through wednesday
morning...

.rest of today...northwest winds 5 to 15 knots. waves 2 to 4 feet
subsiding to calm to 2 feet. 
.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 showers. freezing spray after midnight. waves
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 becoming north
10 to 20 knots after midnight. 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. waves calm to 2 feet. 
.friday...west gales to 35 knots veering northwest. freezing
spray. snow showers likely. a chance of snow showers. waves
building to 5 to 9 feet occasionally to 11 feet. 
.saturday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. heavy freezing spray. waves subsiding to 2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$