fzus63 kmqt 182002
glfls 
expires:202605190800;;785035

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon may 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... 

low pressure will weaken to 29.9 inches over lake superior tonight. 
another low will follow, reaching lake superior by tuesday morning 
at 29.6 inches. afterwards, a 30.2 inch high over the northern 
plains builds to 30.4 inches tuesday night 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 30.1 
inches over lake superior into friday. a 29.9 inch low lifts into 
the great lakes from the southern plains for saturday, but 30.1 inch 
ridging persists over lake superior.



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

.late this afternoon...northeast winds 5 to 15 knots. patchy fog.
waves 1 to 3 feet. 
.tonight...northeast winds 10 to 20 knots increasing to 15 to
25 knots after midnight. patchy fog. a chance of showers and
thunderstorms through midnight. rain showers after midnight.
waves building to 3 to 6 feet occasionally to 8 feet. 
.tuesday...west winds 10 to 20 knots. patchy fog through early
afternoon. a chance of rain showers through early afternoon.
waves subsiding to 1 to 3 feet. 
.tuesday night...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 south by mid
afternoon. waves calm to 2 feet. 
.wednesday night...southeast 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 backing east by mid
afternoon. waves calm to 2 feet. 
.thursday night...east winds 5 to 15 knots. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 
.friday...east winds 10 to 20 knots backing northeast. a chance
of rain showers. waves building to 1 to 3 feet, then subsiding to
calm to 2 feet. 
.saturday...northeast winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of rain showers. waves calm to 2 feet. 

$$

fzus63 kmqt 182002
glfls 
expires:202605190800;;785036

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon may 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... 

low pressure will weaken to 29.9 inches over lake superior tonight. 
another low will follow, reaching lake superior by tuesday morning 
at 29.6 inches. afterwards, a 30.2 inch high over the northern 
plains builds to 30.4 inches tuesday night 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 30.1 
inches over lake superior into friday. a 29.9 inch low lifts into 
the great lakes from the southern plains for saturday, but 30.1 inch 
ridging persists over lake superior.



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 mon may 18 2026

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

$$