fzus63 kmqt 040801
glfls 
expires:202605042000;;988993

open lake forecast for lake superior
national weather service marquette mi
400 am edt mon may 4 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 29.0 inch low over northwest ontario this morning will send a 29.2 
inch trough across lake superior today. the low lifts into james bay 
at 29.2 inches by tuesday morning as 30.2 inch ridging builds east 
of the canadian rockies. the low continues lifting into far northern 
quebec through wednesday as high pressure shifts to the canadian 
prairies. surface pressure will generally reside between 29.7 and 
29.9 inches over lake superior during the latter half of the week as 
major pressure systems remain far away from the upper great lakes.



lsz162-042000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt mon may 4 2026 /300 am cdt mon may 4 2026/

.early this morning...southwest winds 20 to 30 knots. a chance of
rain showers. waves 3 to 6 feet occasionally to 8 feet. 
.today...west winds 15 to 25 knots increasing to 30 knots with a
few gale force gusts to 35 knots possible in the afternoon, then
diminishing to 20 to 30 knots late. a slight chance of rain
showers through early afternoon. waves subsiding to 3 to 5 feet
occasionally to 7 feet. 
.tonight...west winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. waves subsiding to calm to 2 feet. 
.tuesday...west winds 15 to 25 knots diminishing to 10 to
20 knots late. waves building to 1 to 3 feet, then subsiding to
calm to 2 feet. 
.tuesday night...northwest winds 10 to 20 knots backing west
after midnight. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...west winds 5 to 15 knots veering northwest
after midnight. waves calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots veering northwest.
waves calm to 2 feet. 
.friday...southwest winds 5 to 15 knots veering northwest. waves
calm to 2 feet. 

$$

fzus63 kmqt 040801
glfls 
expires:202605042000;;988994

open lake forecast for lake superior
national weather service marquette mi
400 am edt mon may 4 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 29.0 inch low over northwest ontario this morning will send a 29.2 
inch trough across lake superior today. the low lifts into james bay 
at 29.2 inches by tuesday morning as 30.2 inch ridging builds east 
of the canadian rockies. the low continues lifting into far northern 
quebec through wednesday as high pressure shifts to the canadian 
prairies. surface pressure will generally reside between 29.7 and 
29.9 inches over lake superior during the latter half of the week as 
major pressure systems remain far away from the upper great lakes.



lsz263-042000-
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 edt mon may 4 2026

.early this morning...southwest winds 20 to 30 knots. a chance of
rain showers. waves 3 to 6 feet occasionally to 8 feet building
to 4 to 7 feet occasionally to 9 feet. 
.today...southwest winds 20 to 30 knots becoming west to 30 knots
with a few gale force gusts to 35 knots possible in the
afternoon, then diminishing to 20 to 30 knots late. a slight
chance of rain showers through early afternoon. waves building to
5 to 8 feet occasionally to 10 feet. 
.tonight...west winds 20 to 30 knots diminishing to 15 to
25 knots late. waves subsiding to 3 to 5 feet occasionally to
7 feet. 
.tuesday...west winds 10 to 20 knots. waves subsiding to 2 to
4 feet. 
.tuesday night...west winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots. waves building to 1 to
3 feet. 
.wednesday night...west winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.thursday...west winds 5 to 15 knots backing southwest. waves
calm to 2 feet. 
.friday...southwest winds 5 to 15 knots veering northwest. waves
calm to 2 feet. 

$$