fzus63 kmqt 041401
glfls 
expires:202605042000;;001548

open lake forecast for lake superior
national weather service marquette mi
1001 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 is sending a 
29.2 inch trough across lake superior today. the low lifts near 
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 over the 
canadian prairie splits and moves to the canadian four corners and 
the southern plains at 30.0 inches and 30.2 inches respectively. by 
thursday afternoon, lake superior will be between a 29.5 inch low 
over hudson bay, a 29.4 inch low over the mouth of the st lawrence 
river, a low of 29.7 inches over the black hills, a high of 30.1 
inches over oklahoma, and a weak 29.9 inch high over the 
saskatchewan/manitoba line. the hudson bay and black hills lows will 
work to pass a 29.8 inch trough over lake superior thursday night 
into friday, with the lows consolidating over quebec and the 
canadian maritimes by saturday morning, leaving remnant 29.8 inch 
troughing over lake superior.



lsz162-042000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt mon may 4 2026 /901 am cdt mon may 4 2026/

.rest of today...west winds 20 to 30 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. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...west winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. waves subsiding to 1 to 3 feet. 
.tuesday...west winds 15 to 25 knots diminishing to 10 to
20 knots late. waves 1 to 3 feet. 
.tuesday night...northwest winds 10 to 20 knots backing west
after midnight. waves subsiding to 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 041401
glfls 
expires:202605042000;;001549

open lake forecast for lake superior
national weather service marquette mi
1001 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 is sending a 
29.2 inch trough across lake superior today. the low lifts near 
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 over the 
canadian prairie splits and moves to the canadian four corners and 
the southern plains at 30.0 inches and 30.2 inches respectively. by 
thursday afternoon, lake superior will be between a 29.5 inch low 
over hudson bay, a 29.4 inch low over the mouth of the st lawrence 
river, a low of 29.7 inches over the black hills, a high of 30.1 
inches over oklahoma, and a weak 29.9 inch high over the 
saskatchewan/manitoba line. the hudson bay and black hills lows will 
work to pass a 29.8 inch trough over lake superior thursday night 
into friday, with the lows consolidating over quebec and the 
canadian maritimes by saturday morning, leaving remnant 29.8 inch 
troughing over lake superior.



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-
1001 am edt mon may 4 2026

.rest of today...west winds 20 to 30 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 by late morning. waves 4 to 7 feet
occasionally to 9 feet building to 6 to 9 feet occasionally to
11 feet, then subsiding 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 3 to 5 feet
occasionally to 7 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. 

$$