fzus63 kmqt 172001
glfls 
expires:202608180800;;896915

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon aug 17 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 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior tonight through tuesday 
afternoon, then weak 29.9 inch ridging returns to lake superior 
tuesday night. a 30.0 inch high pressure settles over the northern 
plains tuesday afternoon and night, eventually moving over lake 
superior wednesday evening before expanding to cover much of the 
great lakes by thursday afternoon. friday into the weekend, a low 
pressure of around 29.8 inches transits across northern ontario 
quickly followed by 30.2 inch ridging for the latter part of the 
weekend into next week.




lsz162-180800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt mon aug 17 2026 /301 pm cdt mon aug 17 2026/

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

$$

fzus63 kmqt 172001
glfls 
expires:202608180800;;896916

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon aug 17 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 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior tonight through tuesday 
afternoon, then weak 29.9 inch ridging returns to lake superior 
tuesday night. a 30.0 inch high pressure settles over the northern 
plains tuesday afternoon and night, eventually moving over lake 
superior wednesday evening before expanding to cover much of the 
great lakes by thursday afternoon. friday into the weekend, a low 
pressure of around 29.8 inches transits across northern ontario 
quickly followed by 30.2 inch ridging for the latter part of the 
weekend into next week.




lsz263-180800-
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-
401 pm edt mon aug 17 2026

.late this afternoon...southwest winds 15 to 25 knots. waves 2 to
4 feet. 
.tonight...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 1 to 3 feet. 
.tuesday...northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon, then becoming southwest 10 to 20 knots
late. waves subsiding to calm to 2 feet, then building to 1 to
3 feet. 
.tuesday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering northwest late. waves
subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing southwest by
mid afternoon. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming south
less than 10 knots after midnight. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots. waves calm to 2 feet. 
.thursday night...south winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 
.friday...west winds 10 to 20 knots veering north. waves calm to
2 feet. 
.saturday...north winds 10 to 20 knots. waves calm to 2 feet. 

$$