fzus63 kmqt 160801
glfls 
expires:202608162000;;278354

open lake forecast for lake superior
national weather service marquette mi
401 am edt sun aug 16 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 morning, a 29.9 inch trough is over the lake associated with a 
29.8 inch low over far northern ontario. by tonight, the low will 
deepen to 29.7 inches as 30.0 inch high pressure expands over the 
northern plains. by monday afternoon, the high will build to 30.1 
inches over iowa as the low deepens to 29.6 inches over northeast 
quebec. meanwhile, a 29.5 inch low develops over western hudson bay. 
by tuesday morning, the low will expand across much of hudson bay 
while the hgih weakens to 30.0 inches and sags south of the great 
lakes. as the low reaches northwest quebec at 29.6 inches tuesday 
night, another 30.0 inch high settles over north dakota. this high 
moves over lake superior wednesday evening, expanding to cover much 
of the great lakes by thursday evening. friday into the weekend, a 
low pressure of around 29.87 inches will transit across northern 
ontario.




lsz162-162000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt sun aug 16 2026 /301 am cdt sun aug 16 2026/

.early this morning...west winds 5 to 15 knots. waves calm to
2 feet. 
.today...west winds 10 to 20 knots. waves calm to 2 feet. 
.tonight...west winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. a slight chance of showers 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...west winds 5 to 15 knots veering northwest after
midnight. 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 becoming southwest 10 to
20 knots. a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 160801
glfls 
expires:202608162000;;278355

open lake forecast for lake superior
national weather service marquette mi
401 am edt sun aug 16 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 morning, a 29.9 inch trough is over the lake associated with a 
29.8 inch low over far northern ontario. by tonight, the low will 
deepen to 29.7 inches as 30.0 inch high pressure expands over the 
northern plains. by monday afternoon, the high will build to 30.1 
inches over iowa as the low deepens to 29.6 inches over northeast 
quebec. meanwhile, a 29.5 inch low develops over western hudson bay. 
by tuesday morning, the low will expand across much of hudson bay 
while the hgih weakens to 30.0 inches and sags south of the great 
lakes. as the low reaches northwest quebec at 29.6 inches tuesday 
night, another 30.0 inch high settles over north dakota. this high 
moves over lake superior wednesday evening, expanding to cover much 
of the great lakes by thursday evening. friday into the weekend, a 
low pressure of around 29.87 inches will transit across northern 
ontario.




lsz263-162000-
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 am edt sun aug 16 2026

.early this morning...west winds 5 to 15 knots. a slight chance
of showers. waves calm to 2 feet. 
.today...west winds 10 to 20 knots. a slight chance of showers
through early afternoon. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.tonight...northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots becoming southwest 15 to
25 knots in the afternoon. a chance of showers 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. waves calm to 2 feet. 
.tuesday night...west winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. waves calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots. waves calm to 2 feet.
.thursday...southwest winds 10 to 20 knots becoming south 15 to
25 knots. a chance of showers. waves building to 1 to 3 feet. 

$$