fzus63 kmqt 280201
glfls 
expires:202609280800;;168120

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt sun sep 27 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 30.1 inch high pressure holds over lake superior through monday 
evening. thereafter a 29.7 inch trough will build into the plains 
with lake superior remaining between the trough and high pressure 
over the eastern u.s. the trough will shift to the western part of 
the lake by wednesday night as a 29.3 inch low moves from the 
canadian prairies to the hudson bay. behind the trough, high 
pressure of 30.4 inches develops over the central plains thursday 
night into friday, extending 30.2 inch ridging over the lake.




lsz263-280800-
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 pm edt sun sep 27 2026

.rest of tonight...west winds less than 10 knots becoming north
5 to 15 knots late. patchy fog after midnight. waves calm to
2 feet. 
.monday...northeast winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then increasing to 5 to 15 knots late.
patchy fog through early afternoon. waves calm to 2 feet. 
.monday night...east winds 5 to 15 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. a slight
chance of showers after midnight. waves building to 1 to 3 feet. 
.tuesday...south winds 15 to 25 knots veering southwest by mid
afternoon. a slight chance of showers through early afternoon,
then showers likely by mid afternoon. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.tuesday night...southwest winds 10 to 20 knots becoming south
5 to 15 knots after midnight. a chance of showers. waves
subsiding to calm to 2 feet. 
.wednesday...south winds 10 to 20 knots veering southwest by mid
afternoon. a chance of showers. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. a chance of showers. waves
building to 1 to 3 feet. 
.thursday...west winds 20 to 30 knots. waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.friday...west winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 280201
glfls 
expires:202609280800;;168119

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt sun sep 27 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 30.1 inch high pressure holds over lake superior through monday 
evening. thereafter a 29.7 inch trough will build into the plains 
with lake superior remaining between the trough and high pressure 
over the eastern u.s. the trough will shift to the western part of 
the lake by wednesday night as a 29.3 inch low moves from the 
canadian prairies to the hudson bay. behind the trough, high 
pressure of 30.4 inches develops over the central plains thursday 
night into friday, extending 30.2 inch ridging over the lake.




lsz162-280800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt sun sep 27 2026 /901 pm cdt sun sep 27 2026/

.rest of tonight...west winds 5 to 15 knots veering north late.
patchy fog after midnight. waves calm to 2 feet. 
.monday...northeast winds 5 to 15 knots veering east in the
afternoon, then backing northeast late. patchy fog through early
afternoon. waves calm to 2 feet. 
.monday night...east winds 5 to 15 knots veering south late. a
chance of showers after midnight. waves calm to 2 feet. 
.tuesday...south winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. a chance of showers through early
afternoon, then showers likely by mid afternoon. waves building
to 1 to 3 feet. 
.tuesday night...south winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. a chance of showers. waves subsiding to
calm to 2 feet. 
.wednesday...south winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. a chance of showers. waves calm to
2 feet. 
.wednesday night...southwest winds 10 to 20 knots veering west
after midnight. a chance of showers. waves calm to 2 feet. 
.thursday...west winds 15 to 25 knots. waves building to 1 to
3 feet, then subsiding to calm to 2 feet. 
.friday...west winds 10 to 20 knots diminishing to 5 to 15 knots.
waves calm to 2 feet. 

$$