fzus63 kmqt 122002
glfls 
expires:202605130800;;452565

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue may 12 2026

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 29.7 inch clipper low will move across upper michigan through this 
evening. as the clipper departs eastward early wednesday, ridging 
moves back over lake superior and builds to 30.1 inches wednesday 
night into thursday. this ridging is pressed southeast to the lower 
great lakes late thursday into friday while a 29.1 inch low emanates 
off the canadian rockies. this low is expected to bring troughing of 
29.6 inches over lake superior friday into friday night as it tracks 
to near james bay at 29.3 inches by saturday morning. ridging of 
30.1 inches builds over the lake from northern ontario saturday 
night into sunday, followed by another 29.7 inch trough extending 
from the central plains early next week.



lsz162-130800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt tue may 12 2026 /301 pm cdt tue may 12 2026/

.late this afternoon...north winds 15 to 25 knots. scattered rain
showers. waves 3 to 5 feet occasionally to 7 feet. 
.tonight...north winds 15 to 25 knots diminishing to 5 to
15 knots after midnight, then backing northwest late. a slight
chance of rain showers through midnight. waves subsiding to 1 to
3 feet. 
.wednesday...northwest winds 5 to 15 knots backing west in the
afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots veering east after
midnight. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves building to 1 to 3 feet. 
.thursday night...east winds 10 to 20 knots becoming south 20 to
30 knots after midnight. rain showers. waves building to 3 to
6 feet occasionally to 8 feet. 
.friday...southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. waves subsiding to 3 to 5 feet
occasionally to 7 feet. 
.friday night...west winds 15 to 25 knots increasing to 20 to
30 knots after midnight. waves subsiding to 2 to 4 feet. 
.saturday...west winds 15 to 25 knots becoming northeast 10 to
20 knots. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet. 
.sunday...northeast winds 20 to 30 knots. a chance of rain
showers, then rain showers likely. waves building to 3 to 6 feet
occasionally to 8 feet. 

$$

fzus63 kmqt 122002
glfls 
expires:202605130800;;452566

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue may 12 2026

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 29.7 inch clipper low will move across upper michigan through this 
evening. as the clipper departs eastward early wednesday, ridging 
moves back over lake superior and builds to 30.1 inches wednesday 
night into thursday. this ridging is pressed southeast to the lower 
great lakes late thursday into friday while a 29.1 inch low emanates 
off the canadian rockies. this low is expected to bring troughing of 
29.6 inches over lake superior friday into friday night as it tracks 
to near james bay at 29.3 inches by saturday morning. ridging of 
30.1 inches builds over the lake from northern ontario saturday 
night into sunday, followed by another 29.7 inch trough extending 
from the central plains early next week.



lsz263-130800-
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-
401 pm edt tue may 12 2026

.late this afternoon...north winds 15 to 25 knots. scattered rain
showers. waves 4 to 7 feet occasionally to 9 feet. 
.tonight...north winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then backing northwest late. a slight
chance of rain showers through midnight. waves subsiding to 2 to
4 feet. 
.wednesday...northwest winds 5 to 15 knots backing west in the
afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots becoming east less
than 10 knots late. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves building to 1 to 3 feet. 
.thursday night...southeast winds 15 to 25 knots becoming south
20 to 30 knots after midnight. a chance of rain showers through
midnight, then rain showers likely after midnight. waves building
to 3 to 6 feet occasionally to 8 feet. 
.friday...south winds 20 to 30 knots becoming southwest 15 to
25 knots by mid afternoon. waves 3 to 6 feet occasionally to
8 feet. 
.friday night...west winds 15 to 25 knots increasing to 20 to
30 knots after midnight. waves building to 5 to 8 feet
occasionally to 10 feet. 
.saturday...west winds 20 to 30 knots becoming east 5 to
15 knots. waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to calm to 2 feet. 
.sunday...east winds 15 to 25 knots. a chance of rain showers,
then rain showers likely. waves building to 3 to 6 feet
occasionally to 8 feet. 

$$