fzus63 kmqt 100901
glfls 
expires:202512102100;;324241

open lake forecast for lake superior
national weather service marquette mi
401 am est wed dec 10 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...

29.2 inch low pressure analyzed over southern lake michigan this 
morning slides over the southern lp today, keeping a 29.5 inch 
trough over lake superior at least through the mid-morning. this 
weakens slightly to 29.6 or 29.7 inches this afternoon as the low 
continues to track through southern ontario and eventually quebec 
tonight. this will allow 30.3 inch high pressure to rebuild over the 
northern plains later today through thursday while extending weak 
ridging over lake superior. ridging breaks down slightly early 
friday as a 29.9 inch trough drops out of northern ontario, but 
riding quickly rebuilds this weekend as 30.5 inch high pressure over 
the northern plains extends back into the great lakes.



lsz162-102100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am est wed dec 10 2025 /301 am cst wed dec 10 2025/

.early this morning...north winds 20 to 30 knots. freezing spray.
waves 5 to 8 feet occasionally to 10 feet. 
.today...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. 
.tonight...northwest winds 15 to 25 knots diminishing to 10 to
20 knots by midnight. waves subsiding to calm to 2 feet. 
.thursday...northwest winds 5 to 15 knots backing west. waves
calm to 2 feet. 
.thursday night...west winds 5 to 15 knots. 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. snow showers likely in the morning, then a
chance of snow showers in the afternoon. waves building to 3 to
5 feet occasionally to 7 feet. 
.friday night...northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. waves building to 3 to 6 feet
occasionally to 8 feet. 
.saturday...northwest winds 20 to 30 knots. waves subsiding to
1 to 3 feet. 
.sunday...northwest winds 15 to 25 knots backing southwest. a
chance of snow showers. waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 100901
glfls 
expires:202512102100;;324242

open lake forecast for lake superior
national weather service marquette mi
401 am est wed dec 10 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...

29.2 inch low pressure analyzed over southern lake michigan this 
morning slides over the southern lp today, keeping a 29.5 inch 
trough over lake superior at least through the mid-morning. this 
weakens slightly to 29.6 or 29.7 inches this afternoon as the low 
continues to track through southern ontario and eventually quebec 
tonight. this will allow 30.3 inch high pressure to rebuild over the 
northern plains later today through thursday while extending weak 
ridging over lake superior. ridging breaks down slightly early 
friday as a 29.9 inch trough drops out of northern ontario, but 
riding quickly rebuilds this weekend as 30.5 inch high pressure over 
the northern plains extends back into the great lakes.



lsz263-102100-
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 am est wed dec 10 2025

...gale warning in effect until 11 am est this morning...

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

note, wave height forecasts are for ice free areas.

$$