fzus63 kmqt 252037
glfls 
expires:202608260445;;353547

open lake forecast for lake superior
national weather service marquette mi
437 pm edt tue aug 25 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...

this afternoon, lake superior is between 30.1 inch high pressure 
over the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz162-260445-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
437 pm edt tue aug 25 2026 /337 pm cdt tue aug 25 2026/

...severe thunderstorm watch 626 in effect until 11 pm edt /10 pm
cdt/ this evening...

.late this afternoon...east winds 5 to 15 knots. a chance of
showers and thunderstorms. waves calm to 2 feet. 
.tonight...northeast winds 5 to 15 knots backing west after
midnight, then increasing to 10 to 20 knots late. a chance of
showers and thunderstorms. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots. a slight chance of
showers by mid afternoon. waves calm to 2 feet. 
.wednesday night...northwest winds 10 to 20 knots. waves calm to
2 feet. 
.thursday...north winds 5 to 15 knots veering south by mid
afternoon. waves calm to 2 feet. 
.thursday night...northeast winds 5 to 15 knots backing north
after midnight. waves calm to 2 feet. 
.friday...east winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.friday night...east winds 5 to 15 knots becoming northeast less
than 10 knots after midnight. waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 
.sunday...south winds 10 to 20 knots backing north. a chance of
showers. waves calm to 2 feet. 

$$

fzus63 kmqt 252037
glfls 
expires:202608260445;;353548

open lake forecast for lake superior
national weather service marquette mi
437 pm edt tue aug 25 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...

this afternoon, lake superior is between 30.1 inch high pressure 
over the southern great lakes basin and a 29.8 inch low over the 
ontario/manitoba line. as the high pushes off to the southeast, the 
low will move directly over lake superior by midday wednesday. by 
thursday morning, the low will deepen to 29.6 inches as it moves 
into western quebec as 30.2 inch high pressure develops in manitoba. 
this high moves over lake superior by midday friday and over the 
lower great lakes saturday. saturday night, low pressure over the 
central to northern plains deepens to 29.7 inches. this low 
approaches the great lakes by early next week.




lsz263-260445-
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-
437 pm edt tue aug 25 2026

.late this afternoon...southeast winds 5 to 15 knots. a chance of
showers and thunderstorms. waves calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots veering southwest after
midnight, then becoming west 10 to 20 knots late. a chance of
showers and thunderstorms. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots. a slight chance of
showers. a slight chance of thunderstorms by mid afternoon. waves
building to 1 to 3 feet. 
.wednesday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then veering north late. waves
subsiding to calm to 2 feet. 
.thursday...north winds 5 to 15 knots. a slight chance of showers
by mid afternoon. waves calm to 2 feet. 
.thursday night...east winds 5 to 15 knots becoming north less
than 10 knots after midnight. waves calm to 2 feet. 
.friday...east winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.friday night...southeast winds 5 to 15 knots veering south after
midnight. waves calm to 2 feet. 
.saturday...south winds 5 to 15 knots increasing to 10 to
20 knots. a chance of showers. waves calm to 2 feet. 
.sunday...south winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 

$$