fzus63 kmqt 160201
glfls 
expires:202608160800;;263168

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt sat aug 15 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 29.9 inch low between thunder bay and the northwest angle builds 
into lake superior at 29.8 inches later tonight. the associated low 
continues to deepen to 29.7 inches as it reaches quebec just south 
of james bay late sunday afternoon. meanwhile, a 30.2 inch high over 
the northern plains on sunday weakens to 30.0 inches as it slides 
generally south of the great lakes early in the week. this allows 
29.8 inch troughing to return to lake superior on tuesday morning. 
around the same time, a 30.1 inch high over the canadian prairies 
and northern plains weakens to 30.0 inches and heads east into the 
great lakes for wednesday and thursday. this ridging shifts east 
into new england thursday night into friday as a 29.8 inch trough 
builds over lake superior from a parent low of at least 29.7 inches 
over northern ontario.




lsz162-160800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt sat aug 15 2026 /901 pm cdt sat aug 15 2026/

.rest of tonight...northeast winds 5 to 15 knots backing west
late. a slight chance of thunderstorms by midnight. a chance of
showers. waves 1 to 3 feet subsiding to calm to 2 feet. 
.sunday...west winds 10 to 20 knots. waves calm to 2 feet. 
.sunday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing west late. waves calm
to 2 feet. 
.monday...west winds 5 to 15 knots becoming southwest 15 to
25 knots by mid afternoon. waves building to 1 to 3 feet. 
.monday night...southwest winds 10 to 20 knots veering west after
midnight. a slight chance of thunderstorms through midnight. a
chance of showers. waves subsiding to calm to 2 feet. 
.tuesday...west winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. waves calm to 2 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.wednesday...southwest winds 5 to 15 knots veering north. waves
calm to 2 feet. 
.thursday...south winds 5 to 15 knots veering southwest. waves
calm to 2 feet. 

$$

fzus63 kmqt 160201
glfls 
expires:202608160800;;263169

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt sat aug 15 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 29.9 inch low between thunder bay and the northwest angle builds 
into lake superior at 29.8 inches later tonight. the associated low 
continues to deepen to 29.7 inches as it reaches quebec just south 
of james bay late sunday afternoon. meanwhile, a 30.2 inch high over 
the northern plains on sunday weakens to 30.0 inches as it slides 
generally south of the great lakes early in the week. this allows 
29.8 inch troughing to return to lake superior on tuesday morning. 
around the same time, a 30.1 inch high over the canadian prairies 
and northern plains weakens to 30.0 inches and heads east into the 
great lakes for wednesday and thursday. this ridging shifts east 
into new england thursday night into friday as a 29.8 inch trough 
builds over lake superior from a parent low of at least 29.7 inches 
over northern ontario.




lsz263-160800-
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 pm edt sat aug 15 2026

.rest of tonight...east winds 5 to 15 knots backing northeast
after midnight, then backing northwest late. showers likely and a
chance of thunderstorms by midnight, then a slight chance of
showers after midnight. waves 1 to 3 feet subsiding to calm to
2 feet. 
.sunday...west winds 10 to 20 knots. a slight chance of showers
through early afternoon. waves building to 1 to 3 feet. 
.sunday night...west winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight, then backing west late. waves subsiding
to calm to 2 feet. 
.monday...west winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet. 
.monday night...southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. a slight chance of thunderstorms
through midnight. a chance of showers. waves subsiding to calm to
2 feet. 
.tuesday...west winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. waves calm to 2 feet. 
.tuesday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing west. waves
calm to 2 feet. 
.thursday...southwest winds 10 to 20 knots backing south. waves
calm to 2 feet. 

$$