fzus63 kmqt 180801
glfls 
expires:202608182000;;926013

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue aug 18 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 through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow 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.




lsz162-182000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt tue aug 18 2026 /301 am cdt tue aug 18 2026/

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

$$

fzus63 kmqt 180801
glfls 
expires:202608182000;;926014

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue aug 18 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 through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow 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.




lsz263-182000-
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 tue aug 18 2026

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

$$