fzus63 kmqt 190801
glfls 
expires:202605192000;;813859

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue may 19 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 29.7 inch low over wisconsin and lower michigan this morning moves 
over eastern lake superior, reaching the ontario/quebec line south 
of james bay at 29.6 inches by this evening. afterwards, a 30.2 inch 
high over the northern plains builds to 30.4 inches tonight into 
wednesday as it tracks eastward into the upper great lakes. the high 
pressure shifts east on thursday while leaving lingering ridging of 
at least 30.2 inches over lake superior into friday. a 29.9 inch low 
lifts into the lower great lakes from the southern plains on 
saturday, but 30.1 inch ridging persists over lake superior.



lsz162-192000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt tue may 19 2026 /301 am cdt tue may 19 2026/

.early this morning...north winds 15 to 25 knots. patchy fog.
rain showers likely. waves 3 to 6 feet occasionally to 8 feet. 
.today...west winds 10 to 20 knots. a slight chance of rain
showers through early afternoon. waves subsiding to 1 to 3 feet. 
.tonight...west winds 5 to 15 knots veering northwest after
midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing south in the
afternoon. waves calm to 2 feet. 
.wednesday night...southeast winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...southeast winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.thursday night...east winds 5 to 15 knots. waves calm to 2 feet.
.friday...northeast winds 10 to 20 knots. waves building to 2 to
4 feet, then subsiding to calm to 2 feet. 
.saturday...northeast winds 5 to 15 knots. a chance of rain
showers. waves calm to 2 feet. 

$$

fzus63 kmqt 190801
glfls 
expires:202605192000;;813860

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue may 19 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 29.7 inch low over wisconsin and lower michigan this morning moves 
over eastern lake superior, reaching the ontario/quebec line south 
of james bay at 29.6 inches by this evening. afterwards, a 30.2 inch 
high over the northern plains builds to 30.4 inches tonight into 
wednesday as it tracks eastward into the upper great lakes. the high 
pressure shifts east on thursday while leaving lingering ridging of 
at least 30.2 inches over lake superior into friday. a 29.9 inch low 
lifts into the lower great lakes from the southern plains on 
saturday, but 30.1 inch ridging persists over lake superior.



lsz263-192000-
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 may 19 2026

.early this morning...north winds 15 to 25 knots. patchy fog.
rain showers likely and a slight chance of thunderstorms. waves
3 to 6 feet occasionally to 8 feet. 
.today...north winds 15 to 25 knots becoming west 10 to 20 knots
in the afternoon. patchy fog through early afternoon. a chance of
rain showers through early afternoon. waves subsiding to 2 to
4 feet. 
.tonight...northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing southwest in
the afternoon, then backing south late. waves calm to 2 feet. 
.wednesday night...southeast winds 5 to 15 knots veering south
after midnight. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots veering south
after midnight. waves calm to 2 feet. 
.friday...east winds 10 to 20 knots. waves building to 2 to
4 feet, then subsiding to calm to 2 feet. 
.saturday...east winds 5 to 15 knots. waves calm to 2 feet. 

$$