fzus63 kmqt 232101
glfls 
expires:202512240900;;101555

open lake forecast for lake superior
national weather service marquette mi
400 pm 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 continues eastward through ontario and 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 29.6 inches moves 
through the lower great lakes friday. a deepening low will then lift 
into the upper great lakes saturday night into sunday.



lsz263-240900-
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 pm est tue dec 23 2025

.late this afternoon...northwest winds 20 to 30 knots. waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet. 
.tonight...north winds 15 to 25 knots diminishing to 5 to
15 knots by midnight, then veering south 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 veering west by mid afternoon. a
slight chance of snow showers in the morning. waves calm to
2 feet. 
.wednesday night...northwest winds 10 to 20 knots becoming north
15 to 25 knots by midnight. waves building to 2 to 4 feet. 
.thursday...northeast winds 10 to 20 knots becoming east 15 to
25 knots in the afternoon. a slight chance of snow showers in the
afternoon. waves building to 3 to 5 feet occasionally to 7 feet. 
.thursday night...southeast winds 20 to 30 knots. snow. waves
building to 6 to 9 feet occasionally to 11 feet. 
.friday...south winds 15 to 25 knots diminishing to 5 to 15 knots
in the afternoon. a chance of snow. waves subsiding to 3 to
5 feet occasionally to 7 feet. 
.friday night...south winds 5 to 15 knots. waves subsiding to
1 to 3 feet. 
.saturday...south winds 10 to 20 knots becoming west gales to
40 knots. a chance of rain showers. freezing spray. waves
building to 8 to 11 feet occasionally to 14 feet. 
.sunday...west gales to 45 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 7 to 10 feet
occasionally to 13 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 232101
glfls 
expires:202512240900;;101554

open lake forecast for lake superior
national weather service marquette mi
400 pm 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 continues eastward through ontario and 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 29.6 inches moves 
through the lower great lakes friday. a deepening low will then lift 
into the upper great lakes saturday night into sunday.



lsz162-240900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est tue dec 23 2025 /300 pm cst tue dec 23 2025/

.late this afternoon...northwest winds 10 to 20 knots. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tonight...north winds 5 to 15 knots veering northeast by
midnight, then veering south late. waves subsiding to calm to
2 feet. 
.wednesday...south winds 5 to 15 knots veering west by mid
afternoon. a slight chance of snow showers in the morning. waves
calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots increasing to 10 to
20 knots by midnight, then veering northeast late. 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...southeast winds 15 to 25 knots. snow. 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, possibly mixed with
rain in the morning. waves subsiding to 1 to 3 feet. 
.friday night...south winds 5 to 15 knots. 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. waves building to 4 to 7 feet
occasionally to 9 feet. 
.sunday...west gales to 40 knots veering northwest. heavy
freezing spray. waves building to 6 to 9 feet occasionally to
11 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$