fzus63 kmqt 171402
glfls 
expires:202605172000;;712458

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sun may 17 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... 

ridging of 30.1 inches over lake superior this morning will push 
east as a 29.2 inch low moves out of colorado. this low will weaken 
to 29.7 inches as it reaches lake superior late tonight. another low 
pressure will follow it, reaching lake superior by tuesday morning 
at 29.7 inches. thereafter a 30.1 inch high will build into the 
midwest wednesday, strengthening to 30.4 inches over lake superior 
wednesday night. the high pressure will shift east on thursday with 
weaker ridging of 30.1 inches over the lake by thursday night.



lsz162-172000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt sun may 17 2026 /901 am cdt sun may 17 2026/

...gale warning in effect from 2 pm edt /1 pm cdt/ this afternoon
through this evening...

.rest of today...east winds 20 to 30 knots becoming northeast
gales to 35 knots in the afternoon. a chance of rain showers by
mid afternoon. waves 3 to 6 feet occasionally to 8 feet building
to 8 to 11 feet occasionally to 14 feet. 
.tonight...northeast gales to 35 knots diminishing to 15 to
25 knots. rain showers through midnight. a chance of
thunderstorms. a chance of rain showers after midnight. waves
subsiding to 3 to 6 feet occasionally to 8 feet. 
.monday...northeast winds 10 to 20 knots. a chance of rain
showers through early afternoon. a slight chance of
thunderstorms. rain showers likely by mid afternoon. waves
subsiding to 2 to 4 feet. 
.monday night...northeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. a chance of rain showers
through midnight. a slight chance of thunderstorms. rain showers
after midnight. waves building to 7 to 10 feet occasionally to
13 feet. 
.tuesday...north gales to 35 knots becoming northwest 10 to
20 knots by mid afternoon. rain showers likely through early
afternoon. waves subsiding to 2 to 4 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves subsiding
to calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots. waves calm to 2 feet.
.thursday...southeast winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 171402
glfls 
expires:202605172000;;712459

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sun may 17 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... 

ridging of 30.1 inches over lake superior this morning will push 
east as a 29.2 inch low moves out of colorado. this low will weaken 
to 29.7 inches as it reaches lake superior late tonight. another low 
pressure will follow it, reaching lake superior by tuesday morning 
at 29.7 inches. thereafter a 30.1 inch high will build into the 
midwest wednesday, strengthening to 30.4 inches over lake superior 
wednesday night. the high pressure will shift east on thursday with 
weaker ridging of 30.1 inches over the lake by thursday night.



lsz263-172000-
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-
1001 am edt sun may 17 2026

.rest of today...east winds 10 to 20 knots becoming northeast
20 to 30 knots in the afternoon, then increasing to 30 knots with
a few gale force gusts to 35 knots possible late. a slight chance
of rain showers by mid afternoon. waves 2 to 4 feet building to
6 to 9 feet occasionally to 11 feet. 
.tonight...east winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. a chance of rain showers through
midnight. a chance of thunderstorms. rain showers after midnight.
waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.monday...north winds 10 to 20 knots veering northeast late. a
chance of rain showers through early afternoon. a slight chance
of thunderstorms. rain showers likely by mid afternoon. waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet. 
.monday night...northeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. a chance of rain showers
through midnight. a slight chance of thunderstorms. rain showers
after midnight. waves building to 7 to 10 feet occasionally to
13 feet. 
.tuesday...north gales to 35 knots becoming northwest 15 to
25 knots by mid afternoon. rain showers through early afternoon.
waves building to 8 to 11 feet occasionally to 14 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday night...north winds 10 to 20 knots backing northwest
after midnight. waves subsiding to 2 to 4 feet. 
.wednesday...southwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 
.thursday...southwest winds 5 to 15 knots backing south. waves
building to 1 to 3 feet, then subsiding to calm to 2 feet. 

$$