fzus63 kmqt 221402
glfls 
expires:202607222000;;411061

open lake forecast for lake superior
national weather service marquette mi
1001 am edt wed jul 22 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 30.1 inches over the western part of the lake flattens and moves 
east towards new england the rest of today into early friday 
morning. while ridging of around 30.0 inches looks to remain over 
lake superior on thursday, a weak 29.9 to 30.0 inch low could move 
over the northwestern half of the lake by thursday night into friday 
morning. as a low around 29.3 inches lifts from far northern ontario 
into hudson bay friday night into saturday morning, expect troughing 
of around 29.8 inches to move into lake superior in response by 
saturday morning. troughing of at least 29.8 inches looks to remain 
over the lake for the rest of the day. while weak ridging of 29.8 to 
29.9 inches develops over lake superior sunday morning, a 29.6 inch 
low moving in from the west moves over the upper great lakes by 
monday morning. 




lsz162-222000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt wed jul 22 2026 /901 am cdt wed jul 22 2026/

.rest of today...west winds 5 to 15 knots backing southwest in
the afternoon, then increasing to 10 to 20 knots late. waves calm
to 2 feet building to 1 to 3 feet. 
.tonight...southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight, then becoming southwest 10 to 20 knots
late. waves subsiding to calm to 2 feet. 
.thursday...southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. waves building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.thursday night...southwest winds 10 to 20 knots. waves subsiding
to calm to 2 feet, then building to 1 to 3 feet. 
.friday...southwest winds 15 to 25 knots. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.friday night...southwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. showers likely and a chance of
thunderstorms after midnight. waves building to 3 to 6 feet
occasionally to 8 feet. 
.saturday...southwest winds 15 to 25 knots becoming northeast
5 to 15 knots. waves subsiding to calm to 2 feet. 
.sunday...northeast winds 5 to 15 knots. a chance of showers and
thunderstorms. waves calm to 2 feet. 

$$

fzus63 kmqt 221402
glfls 
expires:202607222000;;411062

open lake forecast for lake superior
national weather service marquette mi
1001 am edt wed jul 22 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 30.1 inches over the western part of the lake flattens and moves 
east towards new england the rest of today into early friday 
morning. while ridging of around 30.0 inches looks to remain over 
lake superior on thursday, a weak 29.9 to 30.0 inch low could move 
over the northwestern half of the lake by thursday night into friday 
morning. as a low around 29.3 inches lifts from far northern ontario 
into hudson bay friday night into saturday morning, expect troughing 
of around 29.8 inches to move into lake superior in response by 
saturday morning. troughing of at least 29.8 inches looks to remain 
over the lake for the rest of the day. while weak ridging of 29.8 to 
29.9 inches develops over lake superior sunday morning, a 29.6 inch 
low moving in from the west moves over the upper great lakes by 
monday morning. 




lsz263-222000-
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 wed jul 22 2026

.rest of today...northwest winds 5 to 15 knots backing west in
the afternoon, then becoming southwest 10 to 20 knots late. waves
calm to 2 feet building to 2 to 4 feet. 
.tonight...southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight, then increasing to 10 to 20 knots late.
waves subsiding to 1 to 3 feet. 
.thursday...southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. waves building to 2 to 4 feet. 
.thursday night...southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. a slight chance of thunderstorms
through midnight. a slight chance of showers. waves subsiding to
1 to 3 feet, then building to 2 to 4 feet. 
.friday...southwest winds 15 to 25 knots. waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.friday night...south winds 20 to 30 knots veering southwest
after midnight. showers likely and a chance of thunderstorms
after midnight. waves building to 4 to 7 feet occasionally to
9 feet. 
.saturday...southwest winds 20 to 30 knots becoming northeast
5 to 15 knots. a chance of showers. waves subsiding to calm to
2 feet. 
.sunday...northeast winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 

$$