fzus63 kmqt 220801
glfls 
expires:202607222000;;397866

open lake forecast for lake superior
national weather service marquette mi
400 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... 

heights continue to rise over the lake this morning before becoming 
maximized at 30.1 inches over the western lake by around noon edt. 
afterwards, the high 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-
400 am edt wed jul 22 2026 /300 am cdt wed jul 22 2026/

.early this morning...northwest winds 10 to 20 knots. waves calm
to 2 feet. 
.today...northwest winds 5 to 15 knots backing southwest in the
afternoon, then increasing to 10 to 20 knots late. waves 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 220801
glfls 
expires:202607222000;;397867

open lake forecast for lake superior
national weather service marquette mi
400 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... 

heights continue to rise over the lake this morning before becoming 
maximized at 30.1 inches over the western lake by around noon edt. 
afterwards, the high 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-
400 am edt wed jul 22 2026

.early this morning...northwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...northwest winds 5 to 15 knots backing west in the
afternoon, then becoming southwest 10 to 20 knots late. waves
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. 

$$