fzus63 kmqt 182120 cca
glfls 
expires:202511190900;;100444

open lake forecast for lake superior...corrected
national weather service marquette mi
420 pm est tue nov 18 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...

high pressure averaging 30.1 inches persists over lake superior as a 
28.8 inch low retrogrades back into far northern quebec. 30.2 inch 
ridging continues to encompass the great lakes basin wednesday, 
shifting into new england wednesday night and thursday as a 29.7 
inch low develops over northern ontario. high pressure ridging of 
around 30.1 inches develops over the northern plains and upper 
midwest on friday before moving into the great lakes region by 
saturday. meanwhile, troughing of 29.8 inches moves over lake
superior on saturday before weakening to 29.9 inches over the lake by
sunday morning. 



lsz162-190900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
420 pm est tue nov 18 2025 /320 pm cst tue nov 18 2025/

.late this afternoon...east winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...southwest winds less than 10 knots increasing to 5 to
15 knots by midnight. waves calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots increasing to 10 to
20 knots. a slight chance of rain showers in the afternoon. waves
building to 1 to 3 feet. 
.wednesday night...southwest winds 10 to 20 knots increasing to
15 to 25 knots by midnight, then diminishing to 10 to 20 knots
late. a chance of rain showers in the evening, then rain showers
likely after midnight. waves building to 2 to 4 feet. 
.thursday...west winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. a chance of rain showers in the
morning. waves subsiding to 1 to 3 feet. 
.thursday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves 1 to 3 feet. 
.friday...northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. waves subsiding to calm to 2 feet. 
.friday night...west winds 5 to 15 knots backing southwest after
midnight. waves calm to 2 feet. 
.saturday...southwest winds 10 to 20 knots veering west. waves
building to 1 to 3 feet, then subsiding to calm to 2 feet. 
.sunday...west winds 10 to 20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 182120 cca
glfls 
expires:202511190900;;100445

open lake forecast for lake superior...corrected
national weather service marquette mi
420 pm est tue nov 18 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...

high pressure averaging 30.1 inches persists over lake superior as a 
28.8 inch low retrogrades back into far northern quebec. 30.2 inch 
ridging continues to encompass the great lakes basin wednesday, 
shifting into new england wednesday night and thursday as a 29.7 
inch low develops over northern ontario. high pressure ridging of 
around 30.1 inches develops over the northern plains and upper 
midwest on friday before moving into the great lakes region by 
saturday. meanwhile, troughing of 29.8 inches moves over lake
superior on saturday before weakening to 29.9 inches over the lake by
sunday morning. 



lsz263-190900-
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-
420 pm est tue nov 18 2025

.late this afternoon...northwest winds less than 10 knots. waves
calm to 2 feet. 
.tonight...west winds less than 10 knots becoming southwest 5 to
15 knots late. waves calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots increasing to 10 to
20 knots. waves building to 1 to 3 feet. 
.wednesday night...southwest winds 10 to 20 knots increasing to
15 to 25 knots by midnight. a chance of rain showers. waves
building to 3 to 5 feet occasionally to 7 feet. 
.thursday...southwest winds 15 to 25 knots veering west in the
afternoon. rain showers likely in the morning, then a slight
chance of rain showers in the afternoon. waves 3 to 5 feet
occasionally to 7 feet. 
.thursday night...west winds 15 to 25 knots. waves subsiding to
2 to 4 feet. 
.friday...northwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon. waves subsiding to calm to 2 feet. 
.friday night...west winds 5 to 15 knots backing southwest after
midnight. waves calm to 2 feet. 
.saturday...southwest winds 15 to 25 knots becoming west 10 to
20 knots. waves building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.sunday...west winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 

$$