fzus63 kmqt 130801
glfls 
expires:202605132000;;479099

open lake forecast for lake superior
national weather service marquette mi
400 am edt wed may 13 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 29.6 inch low will depart the region today, tracking over lake 
huron to eastern ontario where it will stall through thursday 
morning. ridging moves back over lake superior in its wake and 
builds to 30.1 inches tonight 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.



lsz162-132000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt wed may 13 2026 /301 am cdt wed may 13 2026/

.early this morning...northwest winds 5 to 15 knots. waves 1 to
3 feet. 
.today...northwest winds 5 to 15 knots backing southwest late.
waves subsiding to calm to 2 feet. 
.tonight...south winds 5 to 15 knots backing northeast after
midnight, then veering east late. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots increasing to 15 to
25 knots. waves building to 2 to 4 feet. 
.thursday night...east winds 15 to 25 knots veering south after
midnight. rain showers likely. waves building to 3 to 5 feet
occasionally to 7 feet. 
.friday...southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. waves building to 4 to 7 feet
occasionally to 9 feet. 
.friday night...southwest winds 20 to 30 knots veering west after
midnight. waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.saturday...west winds 15 to 25 knots becoming northeast 10 to
20 knots. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 
.sunday...northeast winds 20 to 30 knots increasing to gales to
35 knots. a chance of rain showers, then rain showers likely.
waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 

$$

fzus63 kmqt 130801
glfls 
expires:202605132000;;479100

open lake forecast for lake superior
national weather service marquette mi
400 am edt wed may 13 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 29.6 inch low will depart the region today, tracking over lake 
huron to eastern ontario where it will stall through thursday 
morning. ridging moves back over lake superior in its wake and 
builds to 30.1 inches tonight 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.



lsz263-132000-
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 am edt wed may 13 2026

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

$$