fzus63 kmqt 250301
glfls 
expires:202512250900;;173262

open lake forecast for lake superior
national weather service marquette mi
1000 pm 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...

weak 30.1 inch troughing over lake superior this evening will give 
way to 30.4 inch ridging on thursday as a 30.5 inch high transits 
northern ontario. low pressure of 29.7 inches moves east along the 
southern end of the great lakes basin on friday. another low of 29.6 
inches then lifts over lower michigan sunday while extending a 29.7 
inch trough northward across the lake. by monday, a strong high 
pressure of at least 30.6 inches will reside over the great plains 
as the low deepens to 29.1 inches over quebec, yielding a tight 
pressure gradient across the great lakes.



lsz162-250900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm est wed dec 24 2025 /900 pm cst wed dec 24 2025/

.rest of tonight...north winds 10 to 20 knots becoming northeast
15 to 25 knots late. waves calm to 2 feet building to 2 to
4 feet. 
.thursday...northeast winds 15 to 25 knots veering east. 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 becoming south
10 to 20 knots late. a chance of snow showers in the evening. a
chance of sleet. snow showers, possibly mixed with freezing rain
after midnight. waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 2 to 4 feet. 
.friday...south winds 5 to 15 knots veering west in the
afternoon. a chance of snow showers, possibly mixed with rain in
the morning. waves subsiding to calm to 2 feet. 
.friday night...south winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...south winds 5 to 15 knots backing southeast in the
afternoon. a chance of rain showers. waves calm to 2 feet. 
.saturday night...south winds 5 to 15 knots becoming west 10 to
20 knots after midnight. a chance of rain showers. waves building
to 1 to 3 feet. 
.sunday...northwest gales to 45 knots. a chance of rain showers.
a chance of snow showers. heavy freezing spray. waves building to
6 to 9 feet occasionally to 11 feet. 
.monday...northwest gales to 45 knots. heavy freezing spray.
waves subsiding to 1 to 3 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 250301
glfls 
expires:202512250900;;173263

open lake forecast for lake superior
national weather service marquette mi
1000 pm 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...

weak 30.1 inch troughing over lake superior this evening will give 
way to 30.4 inch ridging on thursday as a 30.5 inch high transits 
northern ontario. low pressure of 29.7 inches moves east along the 
southern end of the great lakes basin on friday. another low of 29.6 
inches then lifts over lower michigan sunday while extending a 29.7 
inch trough northward across the lake. by monday, a strong high 
pressure of at least 30.6 inches will reside over the great plains 
as the low deepens to 29.1 inches over quebec, yielding a tight 
pressure gradient across the great lakes.



lsz263-250900-
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 pm est wed dec 24 2025

.rest of tonight...north winds 10 to 20 knots veering northeast
late. waves 1 to 3 feet 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
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 veering south
late. a chance of snow showers in the evening, then snow showers,
possibly mixed with rain and sleet after midnight. waves building
to 6 to 9 feet occasionally to 11 feet. 
.friday...south winds 15 to 25 knots becoming west 5 to 15 knots
in the afternoon. a chance of snow showers, possibly mixed with
rain and sleet in the morning. waves subsiding to 2 to 4 feet. 
.friday night...south winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.saturday...south winds 5 to 15 knots. waves building to 1 to
3 feet. 
.saturday night...south winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. a chance of rain showers. a chance
of snow showers after midnight. waves 1 to 3 feet. 
.sunday...west gales to 40 knots becoming northwest storm force
winds to 55 knots. a chance of rain showers. a chance of snow
showers. heavy freezing spray. waves building to 10 to 14 feet
occasionally to 18 feet. 
.monday...northwest storm force winds to 55 knots diminishing to
gales to 40 knots. heavy freezing spray. waves building to 11 to
15 feet occasionally to 19 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$