fzus63 kmqt 180205 cca
glfls 
expires:202605180800;;741163

open lake forecast for lake superior...corrected
national weather service marquette mi
1005 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... 

a 29.5 inch low over the plains this evening weakens to 29.6 inches 
as it pushes into lake superior monday morning. another low pressure 
follows it, 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 traverses 
eastwards 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.



lsz162-180800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1005 pm edt sun may 17 2026 /905 pm cdt sun may 17 2026/

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

.rest of tonight...east winds 20 to 30 knots with a few gale force
gusts up to 35 knots early backing northeast after midnight, then 
diminishing to 15 to 25 knots late. a chance of rain showers by 
midnight, then rain showers likely and a slight chance of 
thunderstorms after midnight. waves 7 to 10 feet occasionally to 13 
feet 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 6 to 9 feet
occasionally to 11 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
building to 1 to 3 feet. 
.friday...south winds 5 to 15 knots backing east. waves subsiding
to calm to 2 feet. 

$$

fzus63 kmqt 180205 cca
glfls 
expires:202605180800;;741164

open lake forecast for lake superior...corrected
national weather service marquette mi
1005 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... 

a 29.5 inch low over the plains this evening weakens to 29.6 inches 
as it pushes into lake superior monday morning. another low pressure 
follows it, 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 traverses 
eastwards 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.



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-
1005 pm edt sun may 17 2026

.rest of tonight...east winds 15 to 25 knots. a chance of rain
showers by midnight, then rain showers and a chance of
thunderstorms after midnight. waves 4 to 7 feet occasionally to
9 feet subsiding to 3 to 6 feet occasionally to 8 feet. 
.monday...north winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then becoming northeast 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 through
midnight. a slight chance of thunderstorms. rain showers after
midnight. waves building to 6 to 9 feet occasionally to 11 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 7 to 10 feet occasionally to
13 feet, then subsiding to 3 to 5 feet occasionally to 7 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 southwest
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 increasing to 10 to
20 knots. waves building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.friday...south winds 5 to 15 knots backing southeast. waves
subsiding to calm to 2 feet. 

$$