fzus63 kmqt 241501
glfls 
expires:202512242100;;144386

open lake forecast for lake superior
national weather service marquette mi
1000 am est wed dec 24 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 30.4 inch high pressure over the upper great lakes this morning 
moves over the lower great lakes this evening, followed by a weak 
30.1 inch trough. 30.4 inch ridging briefly builds back over lake 
superior on thursday as a 30.5 inch high transits ontario. low 
pressure of 29.6 inches moves east along the southern end of the 
great lakes basin on friday. a deepening low then lifts over the 
upper great lakes saturday night and sunday. by monday, a strong 
high pressure of at least 30.6 inches will have set up over the 
plains with the now 29.1 inch low moving to quebec, yielding a tight 
pressure gradient over the great lakes.



lsz162-242100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est wed dec 24 2025 /900 am cst wed dec 24 2025/

.rest of today...south winds 5 to 15 knots becoming southwest
10 to 20 knots by late morning, then becoming west 5 to 15 knots
by mid afternoon. waves calm to 2 feet. 
.tonight...north winds 5 to 15 knots increasing to 10 to 20 knots
by midnight, then becoming northeast 15 to 25 knots late. waves
building to 2 to 4 feet. 
.thursday...northeast winds 15 to 25 knots veering east. a chance
of snow showers, possibly mixed with freezing rain in the
afternoon. waves building to 3 to 5 feet occasionally to 7 feet. 
.thursday night...southeast winds 15 to 25 knots. snow showers,
possibly mixed with sleet. waves building to 3 to 6 feet
occasionally to 8 feet. 
.friday...south winds 10 to 20 knots becoming southwest 5 to
15 knots in the afternoon. a chance of snow showers, possibly
mixed with rain in the morning. waves subsiding to calm to
2 feet. 
.friday night...southwest winds 5 to 15 knots backing south after
midnight. waves calm to 2 feet. 
.saturday...southeast winds 10 to 20 knots becoming west 20 to
30 knots. a chance of rain showers. a chance of snow showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.sunday...west gales to 40 knots veering northwest. heavy
freezing spray. a chance of snow showers. waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 241501
glfls 
expires:202512242100;;144387

open lake forecast for lake superior
national weather service marquette mi
1000 am est wed dec 24 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 30.4 inch high pressure over the upper great lakes this morning 
moves over the lower great lakes this evening, followed by a weak 
30.1 inch trough. 30.4 inch ridging briefly builds back over lake 
superior on thursday as a 30.5 inch high transits ontario. low 
pressure of 29.6 inches moves east along the southern end of the 
great lakes basin on friday. a deepening low then lifts over the 
upper great lakes saturday night and sunday. by monday, a strong 
high pressure of at least 30.6 inches will have set up over the 
plains with the now 29.1 inch low moving to quebec, yielding a tight 
pressure gradient over the great lakes.



lsz263-242100-
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 wed dec 24 2025

.rest of today...south winds 5 to 15 knots veering west by mid
afternoon. a slight chance of snow showers late in the morning.
waves calm to 2 feet building to 1 to 3 feet. 
.tonight...north winds 10 to 20 knots veering northeast late.
waves building to 3 to 5 feet occasionally to 7 feet. 
.thursday...northeast winds 10 to 20 knots veering east by late
morning, then increasing to 15 to 25 knots by mid afternoon. a
slight chance of snow showers in the afternoon. waves subsiding
to 2 to 4 feet, then building to 3 to 5 feet occasionally to
7 feet. 
.thursday night...southeast winds 20 to 30 knots. snow showers.
waves building to 6 to 9 feet occasionally to 11 feet. 
.friday...south winds 20 to 30 knots becoming southwest 5 to
15 knots in the afternoon. a chance of rain showers in the
morning. a chance of snow showers. waves subsiding to 2 to
4 feet. 
.friday night...southwest winds 5 to 15 knots backing south after
midnight. waves subsiding to calm to 2 feet. 
.saturday...south winds 10 to 20 knots becoming west 20 to
30 knots. a chance of rain showers, possibly mixed with snow.
waves building to 6 to 9 feet occasionally to 11 feet. 
.sunday...west gales to 45 knots becoming northwest storm force
winds to 50 knots. heavy freezing spray. a chance of snow
showers. waves building to 12 to 17 feet occasionally to 21 feet,
then subsiding to 10 to 14 feet occasionally to 18 feet. 

note, wave height forecasts are for ice free areas.

$$