fzus63 kmqt 092001
glfls 
expires:202604100800;;098555

open lake forecast for lake superior
national weather service marquette mi
400 pm edt thu apr 9 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 30.2 inch high pressure over the northern plains builds into the 
upper great lakes through tonight. the high builds to 30.5 inches 
over the lower great lakes by saturday. on sunday, a 29.3 inch low 
pressure lifts through the northern plains while the 30.5 inch high 
pushes off of the eastern seaboard into the atlantic. this low 
pushes east through the upper great lakes sunday night before 
continuing into northern quebec monday. another low will take shape 
over the central plains on monday, deepening to 29.5 inches on 
tuesday with a weak 29.8 inch trough extending through the upper 
great lakes.



lsz162-100800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt thu apr 9 2026 /300 pm cdt thu apr 9 2026/

.late this afternoon...west winds 5 to 15 knots. waves 1 to
3 feet subsiding to calm to 2 feet. 
.tonight...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.friday...west winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. waves calm to 2 feet. 
.friday night...southwest winds 5 to 15 knots veering west after
midnight. waves calm to 2 feet. 
.saturday...south winds 5 to 15 knots backing east by mid
afternoon. a slight chance of rain showers, possibly mixed with
snow by mid afternoon. waves calm to 2 feet. 
.saturday night...east winds 10 to 20 knots. rain showers. waves
building to 2 to 4 feet. 
.sunday...east winds 10 to 20 knots backing northeast by mid
afternoon. rain showers. a chance of thunderstorms by mid
afternoon. waves subsiding to 1 to 3 feet. 
.sunday night...west winds 10 to 20 knots. rain showers likely
through midnight. waves building to 2 to 4 feet. 
.monday...east winds 5 to 15 knots becoming northeast 20 to
30 knots. rain showers likely. waves subsiding to calm to 2 feet,
then building to 6 to 9 feet occasionally to 11 feet. 
.tuesday...northeast winds 20 to 30 knots. a chance of rain
showers, possibly mixed with snow. waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 6 to 9 feet occasionally
to 11 feet. 

$$

fzus63 kmqt 092001
glfls 
expires:202604100800;;098556

open lake forecast for lake superior
national weather service marquette mi
400 pm edt thu apr 9 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 30.2 inch high pressure over the northern plains builds into the 
upper great lakes through tonight. the high builds to 30.5 inches 
over the lower great lakes by saturday. on sunday, a 29.3 inch low 
pressure lifts through the northern plains while the 30.5 inch high 
pushes off of the eastern seaboard into the atlantic. this low 
pushes east through the upper great lakes sunday night before 
continuing into northern quebec monday. another low will take shape 
over the central plains on monday, deepening to 29.5 inches on 
tuesday with a weak 29.8 inch trough extending through the upper 
great lakes.



lsz263-100800-
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-
400 pm edt thu apr 9 2026

.late this afternoon...west winds 10 to 20 knots. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...west winds 5 to 15 knots becoming northwest less than
10 knots after midnight, then increasing to 5 to 15 knots late.
waves subsiding to calm to 2 feet. 
.friday...west winds 5 to 15 knots backing southwest late. waves
calm to 2 feet. 
.friday night...southwest winds 5 to 15 knots diminishing to less
than 10 knots late. waves calm to 2 feet. 
.saturday...south winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. a slight chance of rain showers by mid
afternoon. waves calm to 2 feet. 
.saturday night...southeast winds 10 to 20 knots. rain showers.
waves building to 3 to 5 feet occasionally to 7 feet. 
.sunday...southeast winds 10 to 20 knots becoming south 5 to
15 knots by mid afternoon. rain showers. a chance of
thunderstorms by mid afternoon. waves building to 3 to 6 feet
occasionally to 8 feet. 
.sunday night...southwest winds 10 to 20 knots veering west after
midnight. rain showers likely through midnight. waves building to
4 to 7 feet occasionally to 9 feet. 
.monday...north winds 10 to 20 knots becoming northeast 20 to
30 knots. rain showers likely. waves subsiding to 1 to 3 feet,
then building to 6 to 9 feet occasionally to 11 feet. 
.tuesday...northeast winds 20 to 30 knots. a chance of rain
showers, possibly mixed with snow. waves building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 

$$