fzus63 kmqt 010201
glfls 
expires:202608010800;;418274

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt fri jul 31 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 evening, a 29.7 inch low is over eastern iowa while a 30.0 inch 
high is over manitoba. through the weekend, the high shifts over 
northern ontario while the low shifts south of the great lakes. by 
sunday night, the 30.0 inch high over northeast ontario and james 
bay will extend 29.9 inch ridging over the lake while the low moves 
over the appalachian range at 29.8 inches. meanwhile, a 29.3 inch 
low will move from saskatchewan into northern manitoba sunday night 
into monday morning. by monday night, this low will force the 30.0 
inch high over the great lakes as the low weakens to 29.5 inches 
over western hudson bay. tuesday, the high builds to 30.1 inches as 
it moves over the east coast while the low expands over the rest of 
hudson bay. wednesday and thursday, the high merges with a 30.3 inch 
bermuda high, sending a 30.0 inch ridge over lake superior while the 
low retrogrades back to northern manitoba, weakening to 29.6 inches.




lsz162-010800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt fri jul 31 2026 /901 pm cdt fri jul 31 2026/

.rest of tonight...southwest winds 5 to 15 knots veering west
after midnight, then veering north late. patchy smoke. patchy fog
after midnight. waves calm to 2 feet. 
.saturday...northeast winds 5 to 15 knots veering east in the
afternoon, then backing northeast late. a slight chance of
showers by mid afternoon. waves calm to 2 feet. 
.saturday night...north winds 5 to 15 knots veering northeast
late. waves calm to 2 feet. 
.sunday...northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.sunday night...northeast winds 5 to 15 knots veering east after
midnight. waves calm to 2 feet. 
.monday...east winds 5 to 15 knots. waves calm to 2 feet. 
.monday night...northeast winds 5 to 15 knots veering southwest
after midnight. a chance of showers after midnight. waves calm to
2 feet. 
.tuesday...southwest winds 5 to 15 knots veering northwest. waves
calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots veering northwest.
waves calm to 2 feet. 

$$

fzus63 kmqt 010201
glfls 
expires:202608010800;;418275

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt fri jul 31 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 evening, a 29.7 inch low is over eastern iowa while a 30.0 inch 
high is over manitoba. through the weekend, the high shifts over 
northern ontario while the low shifts south of the great lakes. by 
sunday night, the 30.0 inch high over northeast ontario and james 
bay will extend 29.9 inch ridging over the lake while the low moves 
over the appalachian range at 29.8 inches. meanwhile, a 29.3 inch 
low will move from saskatchewan into northern manitoba sunday night 
into monday morning. by monday night, this low will force the 30.0 
inch high over the great lakes as the low weakens to 29.5 inches 
over western hudson bay. tuesday, the high builds to 30.1 inches as 
it moves over the east coast while the low expands over the rest of 
hudson bay. wednesday and thursday, the high merges with a 30.3 inch 
bermuda high, sending a 30.0 inch ridge over lake superior while the 
low retrogrades back to northern manitoba, weakening to 29.6 inches.




lsz263-010800-
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 fri jul 31 2026

.rest of tonight...southwest winds 5 to 15 knots veering west
after midnight, then veering north late. a slight chance of
showers and thunderstorms by midnight. patchy fog and smoke.
waves calm to 2 feet. 
.saturday...northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.saturday night...north winds 5 to 15 knots veering northeast
after midnight. waves calm to 2 feet. 
.sunday...northeast winds 5 to 15 knots. waves calm to 2 feet. 
.sunday night...east winds 5 to 15 knots becoming southeast less
than 10 knots after midnight. waves calm to 2 feet. 
.monday...southeast winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.monday night...southeast winds 10 to 20 knots veering south
after midnight. waves calm to 2 feet. 
.tuesday...southwest winds 5 to 15 knots veering northwest. waves
calm to 2 feet. 
.wednesday...southwest winds 10 to 20 knots becoming west 5 to
15 knots. waves calm to 2 feet. 

$$