fzus63 kmqt 061500
glfls 
expires:202512062100;;108118

open lake forecast for lake superior
national weather service marquette mi
1000 am est sat dec 6 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 30.3 inch high over saskatchewan today progressively builds into 
the northern plains this evening to sunday, eventually strengthening 
to 30.5 inches over minnesota by sunday. the high continues into the 
great lakes basin as it weakens slightly to 30.4 inches by monday. 
by monday afternoon, a 29.7 inch low develops over north dakota, 
eventually moving over lake superior tuesday morning as it deepens 
to 29.6 inches. a second, stronger clipper low forms tuesday over 
the montana/canada border, absorbing the previous low tuesday night 
at 29.2 inches as it approaches lake michigan. the low weakens 
slightly to 29.3 inches as it moves near the lower great lakes on 
wednesday while 30.1 inch ridging settles over the plains. the low 
quickly ejects past the st lawrence seaway by thursday as high 
pressure over the canadian rockies builds to 30.8 inches.



lsz162-062100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est sat dec 6 2025 /900 am cst sat dec 6 2025/

.rest of today...northwest winds 10 to 20 knots diminishing to
5 to 15 knots. waves 2 to 4 feet subsiding to calm to 2 feet. 
.tonight...northwest winds 10 to 20 knots veering north by
midnight. waves building to 1 to 3 feet. 
.sunday...north winds 10 to 20 knots backing northwest by late
morning, then diminishing to 5 to 15 knots by mid afternoon.
waves subsiding to calm to 2 feet. 
.sunday night...northwest winds 5 to 15 knots backing southwest
after midnight. waves calm to 2 feet. 
.monday...southwest winds 15 to 25 knots. a chance of snow
showers. waves building to 3 to 6 feet occasionally to 8 feet. 
.monday night...southwest winds 15 to 25 knots veering west after
midnight. snow showers. waves subsiding to 1 to 3 feet. 
.tuesday...northwest winds 10 to 20 knots becoming northeast
20 to 30 knots. a chance of snow showers, then snow showers
likely. waves subsiding to calm to 2 feet, then building to 4 to
7 feet occasionally to 9 feet. 
.wednesday...north winds 20 to 30 knots diminishing to 10 to
20 knots. freezing spray. a chance of snow showers. waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 061500
glfls 
expires:202512062100;;108119

open lake forecast for lake superior
national weather service marquette mi
1000 am est sat dec 6 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 30.3 inch high over saskatchewan today progressively builds into 
the northern plains this evening to sunday, eventually strengthening 
to 30.5 inches over minnesota by sunday. the high continues into the 
great lakes basin as it weakens slightly to 30.4 inches by monday. 
by monday afternoon, a 29.7 inch low develops over north dakota, 
eventually moving over lake superior tuesday morning as it deepens 
to 29.6 inches. a second, stronger clipper low forms tuesday over 
the montana/canada border, absorbing the previous low tuesday night 
at 29.2 inches as it approaches lake michigan. the low weakens 
slightly to 29.3 inches as it moves near the lower great lakes on 
wednesday while 30.1 inch ridging settles over the plains. the low 
quickly ejects past the st lawrence seaway by thursday as high 
pressure over the canadian rockies builds to 30.8 inches.



lsz263-062100-
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 sat dec 6 2025

.rest of today...northwest winds 10 to 20 knots diminishing to
5 to 15 knots by mid afternoon. waves 3 to 5 feet occasionally to
7 feet subsiding to calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots increasing to 10 to
20 knots by midnight, then veering north late. a slight chance of
snow showers. waves building to 2 to 4 feet. 
.sunday...north winds 10 to 20 knots backing northwest. waves
subsiding to 1 to 3 feet. 
.sunday night...northwest winds 5 to 15 knots backing southwest
after midnight. waves subsiding to calm to 2 feet. 
.monday...southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. a chance of snow showers. waves
building to 4 to 7 feet occasionally to 9 feet. 
.monday night...southwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. snow showers. waves subsiding to
3 to 5 feet occasionally to 7 feet. 
.tuesday...northwest winds 10 to 20 knots becoming northeast
20 to 30 knots. a chance of snow showers. waves subsiding to calm
to 2 feet, then building to 6 to 9 feet occasionally to 11 feet. 
.wednesday...north winds 20 to 30 knots diminishing to 15 to
25 knots. freezing spray. a chance of snow showers. waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$