fzus63 kmqt 230900
glfls 
expires:202512232100;;072248

open lake forecast for lake superior
national weather service marquette mi
400 am est tue dec 23 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 29.8 inch low near thunder bay early this morning progresses east 
today, reaching quebec by this evening. in its wake, a 30.4 inch 
high pressure moves over lake superior from the canadian prairies 
tonight with weak troughing of 30.1 inches moving over the lake late 
wednesday as the high shifts east. 30.3 inch ridging builds back in 
for thursday as a 30.5 inch high transits ontario. low pressure of 
at least 29.6 inches moves through the lower midwest friday. a 
deepening low will then lift into the upper great lakes saturday 
night into sunday.



lsz162-232100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am est tue dec 23 2025 /300 am cst tue dec 23 2025/

.early this morning...west winds 10 to 20 knots. waves calm to
2 feet building to 1 to 3 feet. 
.today...west winds 15 to 25 knots becoming northwest 20 to
30 knots. waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet. 
.tonight...north winds 10 to 20 knots becoming east 5 to 15 knots
by midnight, then veering southeast late. a slight chance of snow
showers and sleet after midnight. waves subsiding to calm to
2 feet. 
.wednesday...south winds 5 to 15 knots veering west by mid
afternoon. a chance of snow showers and sleet in the morning.
waves calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. waves building to 1 to 3 feet. 
.thursday...northeast winds 15 to 25 knots veering east in the
afternoon. a chance of snow showers in the afternoon. waves
building to 3 to 5 feet occasionally to 7 feet. 
.thursday night...east winds 15 to 25 knots veering southeast
after midnight. snow showers. waves building to 3 to 6 feet
occasionally to 8 feet. 
.friday...south winds 10 to 20 knots becoming southeast 5 to
15 knots. a chance of snow showers. waves subsiding to calm to
2 feet. 
.saturday...south winds 10 to 20 knots becoming west gales to
35 knots. a chance of rain showers, possibly mixed with snow. a
chance of freezing rain. waves building to 4 to 7 feet
occasionally to 9 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 230900
glfls 
expires:202512232100;;072249

open lake forecast for lake superior
national weather service marquette mi
400 am est tue dec 23 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 29.8 inch low near thunder bay early this morning progresses east 
today, reaching quebec by this evening. in its wake, a 30.4 inch 
high pressure moves over lake superior from the canadian prairies 
tonight with weak troughing of 30.1 inches moving over the lake late 
wednesday as the high shifts east. 30.3 inch ridging builds back in 
for thursday as a 30.5 inch high transits ontario. low pressure of 
at least 29.6 inches moves through the lower midwest friday. a 
deepening low will then lift into the upper great lakes saturday 
night into sunday.



lsz263-232100-
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-
400 am est tue dec 23 2025

.early this morning...west winds 10 to 20 knots. waves 1 to
3 feet. 
.today...west winds 20 to 30 knots increasing to 30 knots with a
few gale force gusts to 35 knots possible by late morning, then
becoming northwest 20 to 30 knots by mid afternoon. waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 4 to 7 feet occasionally to 9 feet. 
.tonight...north winds 15 to 25 knots becoming northeast 5 to
15 knots by midnight, then veering southeast late. waves
subsiding to calm to 2 feet. 
.wednesday...south winds 5 to 15 knots becoming southwest 10 to
20 knots by late morning, then diminishing to 5 to 15 knots by
mid afternoon. a chance of snow showers and sleet in the morning.
waves calm to 2 feet. 
.wednesday night...north winds 10 to 20 knots. waves building to
2 to 4 feet. 
.thursday...northeast winds 10 to 20 knots becoming east 15 to
25 knots in the afternoon. a chance of snow showers in the
afternoon. waves building to 3 to 5 feet occasionally to 7 feet. 
.thursday night...east winds 20 to 30 knots veering southeast
after midnight. snow showers. waves building to 6 to 9 feet
occasionally to 11 feet. 
.friday...south winds 15 to 25 knots becoming southeast 5 to
15 knots. a chance of snow showers. waves subsiding to 1 to
3 feet. 
.saturday...south winds 15 to 25 knots becoming west gales to
45 knots. a chance of rain and snow showers. freezing spray.
waves building to 8 to 11 feet occasionally to 14 feet. 

note, wave height forecasts are for ice free areas.

$$