fzus63 kmqt 182001
glfls 
expires:202606190800;;975605

open lake forecast for lake superior
national weather service marquette mi
401 pm edt thu jun 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... 

29.2 inch low pressure currently over southern quebec by this 
afternoon slowly fills in on friday over the st. lawrence seaway 
while a 30.0 inch high builds over the mid-mississippi valley, 
persisting into saturday. 30.0 inch high pressure ridging develops 
over lake superior on saturday and remains through sunday as ridging 
progressively increases from northern canada. the ridging over lake 
superior increases to 30.2 inches by monday as the parent high in 
northern canada moves into western hudson bay. however, with a weak 
30.0 inch clipper low approaching lake superior on tuesday, expect 
the ridging over the lake to weaken to 30.1 inches by late in the 
day. the clipper low then arrives in lower michigan on wednesday. 




lsz162-190800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt thu jun 18 2026 /301 pm cdt thu jun 18 2026/

.late this afternoon...west winds 10 to 20 knots. a slight chance
of showers and thunderstorms. waves calm to 2 feet. 
.tonight...west winds 10 to 20 knots diminishing to 5 to 15 knots
late. waves calm to 2 feet. 
.friday...west winds 5 to 15 knots backing southwest in the
afternoon. a chance of showers and a slight chance of
thunderstorms by mid afternoon. waves calm to 2 feet. 
.friday night...southwest winds 5 to 15 knots veering west after
midnight. a slight chance of showers. waves calm to 2 feet. 
.saturday...west winds 5 to 15 knots backing southwest by mid
afternoon. a slight chance of showers by mid afternoon. waves
calm to 2 feet. 
.saturday night...west winds 5 to 15 knots becoming northwest
less than 10 knots after midnight. waves calm to 2 feet. 
.sunday...north winds 5 to 15 knots veering east by mid
afternoon. waves calm to 2 feet. 
.sunday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.monday...northeast winds 5 to 15 knots becoming north less than
10 knots. waves calm to 2 feet. 
.tuesday...northeast winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 

$$

fzus63 kmqt 182001
glfls 
expires:202606190800;;975606

open lake forecast for lake superior
national weather service marquette mi
401 pm edt thu jun 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... 

29.2 inch low pressure currently over southern quebec by this 
afternoon slowly fills in on friday over the st. lawrence seaway 
while a 30.0 inch high builds over the mid-mississippi valley, 
persisting into saturday. 30.0 inch high pressure ridging develops 
over lake superior on saturday and remains through sunday as ridging 
progressively increases from northern canada. the ridging over lake 
superior increases to 30.2 inches by monday as the parent high in 
northern canada moves into western hudson bay. however, with a weak 
30.0 inch clipper low approaching lake superior on tuesday, expect 
the ridging over the lake to weaken to 30.1 inches by late in the 
day. the clipper low then arrives in lower michigan on wednesday. 




lsz263-190800-
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 thu jun 18 2026

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

$$