fzus63 kmqt 080900
glfls 
expires:202512082100;;209583

open lake forecast for lake superior
national weather service marquette mi
400 am est mon dec 8 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 30.5 inch high over minnesota slides over the great lakes basin 
tonight into tomorrow as it weakens to 30.4 inches. by tomorrow 
afternoon, a 29.7 inch low develops over north dakota, eventually 
moving over lake superior tuesday morning as it deepens to 29.5 
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 lifts through 
southern ontario on wednesday while weak 30.1 inch ridging traverses 
the plains. the low quickly ejects past the st. lawrence seaway on 
thursday as high pressure over the canadian rockies builds to 30.9 
inches, eventually dropping into the northern plains on friday.



lsz162-082100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am est mon dec 8 2025 /300 am cst mon dec 8 2025/

.early this morning...southwest winds 10 to 20 knots. waves calm
to 2 feet. 
.today...southwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. a slight chance of snow showers. waves
building to 3 to 5 feet occasionally to 7 feet. 
.tonight...southwest winds 20 to 30 knots diminishing to 15 to
25 knots by midnight, then becoming northwest 10 to 20 knots
late. snow showers in the evening, then a chance of snow showers
after midnight. waves subsiding to 2 to 4 feet. 
.tuesday...northwest winds 10 to 20 knots becoming west 5 to
15 knots by late morning, then backing south by mid afternoon. a
chance of snow showers in the afternoon. waves subsiding to calm
to 2 feet. 
.tuesday night...east winds 15 to 25 knots becoming northeast
20 to 30 knots after midnight. snow showers likely in the
evening, then a chance of snow showers after midnight. freezing
spray after midnight. waves building to 5 to 8 feet occasionally
to 10 feet. 
.wednesday...north winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. freezing spray in the morning. a
chance of snow showers. waves subsiding to 2 to 4 feet. 
.wednesday night...northwest winds 10 to 20 knots. waves
subsiding to calm to 2 feet. 
.thursday...northwest winds 10 to 20 knots. a chance of snow
showers. waves building to 1 to 3 feet. 
.friday...northwest gales to 35 knots. a chance of snow showers.
waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 080900
glfls 
expires:202512082100;;209584

open lake forecast for lake superior
national weather service marquette mi
400 am est mon dec 8 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 30.5 inch high over minnesota slides over the great lakes basin 
tonight into tomorrow as it weakens to 30.4 inches. by tomorrow 
afternoon, a 29.7 inch low develops over north dakota, eventually 
moving over lake superior tuesday morning as it deepens to 29.5 
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 lifts through 
southern ontario on wednesday while weak 30.1 inch ridging traverses 
the plains. the low quickly ejects past the st. lawrence seaway on 
thursday as high pressure over the canadian rockies builds to 30.9 
inches, eventually dropping into the northern plains on friday.



lsz263-082100-
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 mon dec 8 2025

.early this morning...southwest winds 5 to 15 knots. a slight
chance of snow showers. waves calm to 2 feet building to 1 to
3 feet. 
.today...southwest winds 5 to 15 knots increasing to 15 to
25 knots. a slight chance of snow showers. waves building to 3 to
5 feet occasionally to 7 feet. 
.tonight...south winds 15 to 25 knots becoming southwest 10 to
20 knots by midnight, then veering west late. snow showers. waves
building to 3 to 6 feet occasionally to 8 feet. 
.tuesday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of snow showers. waves subsiding to calm to
2 feet. 
.tuesday night...northeast winds 15 to 25 knots increasing to
gales to 35 knots after midnight. a chance of snow showers.
freezing spray after midnight. waves building to 7 to 10 feet
occasionally to 13 feet. 
.wednesday...north gales to 35 knots becoming northwest 15 to
25 knots in the afternoon. freezing spray in the morning. a
chance of snow showers. waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet. 
.wednesday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 1 to 3 feet. 
.thursday...northwest winds 10 to 20 knots increasing to 15 to
25 knots. a chance of snow showers. waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet. 
.friday...northwest gales to 40 knots. freezing spray. a chance
of snow showers. waves building to 5 to 9 feet occasionally to
11 feet. 

note, wave height forecasts are for ice free areas.

$$