fzus63 kmqt 090801
glfls 
expires:202604092000;;071653

open lake forecast for lake superior
national weather service marquette mi
400 am 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 29.7 inch low north of lake superior will reach james bay this 
afternoon as a 30.2 inch high pressure builds into the upper great 
lakes. 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.



lsz162-092000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt thu apr 9 2026 /300 am cdt thu apr 9 2026/

.early this morning...west winds 20 to 30 knots. waves 3 to
6 feet occasionally to 8 feet. 
.today...west winds 20 to 30 knots diminishing to 10 to 20 knots.
waves 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 backing southwest in the
afternoon. waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...south winds 5 to 15 knots backing east 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 veering west. rain showers,
then a chance of rain showers. waves subsiding to 1 to 3 feet,
then building to 3 to 6 feet occasionally to 8 feet. 
.monday...northeast winds 10 to 20 knots increasing to 20 to
30 knots. a chance of rain showers, then rain showers, possibly
mixed with snow. waves subsiding to 2 to 4 feet, then building to
10 to 14 feet occasionally to 18 feet. 

$$

fzus63 kmqt 090801
glfls 
expires:202604092000;;071654

open lake forecast for lake superior
national weather service marquette mi
400 am 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 29.7 inch low north of lake superior will reach james bay this 
afternoon as a 30.2 inch high pressure builds into the upper great 
lakes. 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.



lsz263-092000-
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 am edt thu apr 9 2026

.early this morning...west winds to 30 knots with a few gale
force gusts to 35 knots possible. waves 5 to 9 feet occasionally
to 11 feet. 
.today...west winds 20 to 30 knots diminishing to 15 to 25 knots
late. waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.tonight...west winds 5 to 15 knots becoming northwest less than
10 knots after midnight. 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 after midnight. waves calm to 2 feet. 
.saturday...south winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.saturday night...southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. rain showers. waves building to
3 to 5 feet occasionally to 7 feet. 
.sunday...south winds 15 to 25 knots veering southwest. rain
showers. a chance of thunderstorms. a chance of rain showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.monday...northeast winds 10 to 20 knots increasing to 20 to
30 knots. rain showers, possibly mixed with snow. waves subsiding
to 3 to 5 feet occasionally to 7 feet, then building to 10 to
14 feet occasionally to 18 feet. 

$$