fzus63 kmqt 121402
glfls 
expires:202605122000;;438094

open lake forecast for lake superior
national weather service marquette mi
1001 am 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 near duluth this morning 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.



lsz162-122000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt tue may 12 2026 /901 am cdt tue may 12 2026/

.rest of today...east winds 10 to 20 knots backing north late. a
chance of rain showers. waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.tonight...north winds 15 to 25 knots becoming northwest 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
a slight chance of rain showers. waves subsiding to calm to
2 feet. 
.wednesday...northwest winds 5 to 15 knots backing west in the
afternoon. waves 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 calm to 2 feet. 
.thursday night...east winds 10 to 20 knots becoming south 20 to
30 knots after midnight. rain showers likely. waves building to
3 to 5 feet occasionally to 7 feet. 
.friday...southwest winds 15 to 25 knots veering west. 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. 

$$

fzus63 kmqt 121402
glfls 
expires:202605122000;;438095

open lake forecast for lake superior
national weather service marquette mi
1001 am 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 near duluth this morning 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.



lsz263-122000-
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-
1001 am edt tue may 12 2026

.rest of today...southeast winds 10 to 20 knots increasing to
15 to 25 knots in the afternoon, then backing north late. rain
showers by late morning, then a chance of rain showers by mid
afternoon. waves 2 to 4 feet building to 4 to 7 feet occasionally
to 9 feet. 
.tonight...north winds 15 to 25 knots becoming northwest 10 to
20 knots 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 late.
waves subsiding to calm to 2 feet. 
.wednesday night...northwest winds 5 to 15 knots becoming
southeast less than 10 knots after midnight. waves calm to
2 feet. 
.thursday...east winds less than 10 knots increasing to 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 15 to 25 knots becoming south
20 to 30 knots after midnight. rain showers likely after
midnight. waves building to 3 to 6 feet occasionally to 8 feet. 
.friday...south winds 15 to 25 knots becoming west 20 to
30 knots. waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.saturday...west gales to 35 knots becoming east 10 to 20 knots.
waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to calm to 2 feet. 

$$