fzus63 kmqt 172002
glfls 
expires:202605180800;;727376

open lake forecast for lake superior
national weather service marquette mi
401 pm 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 shifts east into quebec tonight 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 tuesday 
night, 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 continuing into at least 
friday morning.



lsz162-180800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt sun may 17 2026 /301 pm cdt sun may 17 2026/

...gale warning in effect until 11 pm edt /10 pm cdt/ this
evening...

.late this afternoon...northeast gales to 35 knots. waves 6 to
9 feet occasionally to 11 feet building to 7 to 10 feet
occasionally to 13 feet. 
.tonight...northeast gales to 35 knots diminishing to 15 to
25 knots. a chance of rain showers through midnight. a chance of
thunderstorms. rain showers likely after midnight. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.monday...north winds 10 to 20 knots becoming northeast 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. a slight chance of rain showers. waves subsiding to 2 to
4 feet. 
.monday night...northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. a chance of rain showers and a
slight chance of thunderstorms through midnight, then rain
showers after midnight. waves building to 7 to 10 feet
occasionally to 13 feet. 
.tuesday...north winds 20 to 30 knots becoming west 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...northwest winds 5 to 15 knots backing south by mid
afternoon. waves calm to 2 feet. 
.wednesday night...southeast winds 5 to 15 knots veering south
after midnight. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots veering south. waves calm to
2 feet. 
.friday...south winds 5 to 15 knots backing east. waves calm to
2 feet. 

$$

fzus63 kmqt 172002
glfls 
expires:202605180800;;727377

open lake forecast for lake superior
national weather service marquette mi
401 pm 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 shifts east into quebec tonight 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 tuesday 
night, 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 continuing into at least 
friday morning.



lsz263-180800-
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 sun may 17 2026

.late this afternoon...northeast winds to 30 knots with a few
gale force gusts to 35 knots possible. a slight chance of showers
and thunderstorms. waves 5 to 9 feet occasionally to 11 feet,
then subsiding to 5 to 8 feet occasionally to 10 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 likely 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. waves subsiding to 2 to 4 feet. 
.monday night...northeast winds 15 to 25 knots increasing to
20 to 30 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 winds 20 to 30 knots becoming northwest 15 to
25 knots by mid afternoon. rain showers likely 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...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to 2 to 4 feet. 
.wednesday...northwest winds 5 to 15 knots becoming southwest
10 to 20 knots by mid afternoon. waves subsiding to calm to
2 feet. 
.wednesday night...south winds 5 to 15 knots. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 
.thursday...south winds 5 to 15 knots increasing to 10 to
20 knots. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 
.friday...south winds 5 to 15 knots backing southeast. waves calm
to 2 feet. 

$$