fzus63 kmqt 091401
glfls 
expires:202604092000;;083858

open lake forecast for lake superior
national weather service marquette mi
1000 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 29.6 inch low over far northeastern ontario this morning reaches 
james bay by 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-
1000 am edt thu apr 9 2026 /900 am cdt thu apr 9 2026/

.rest of today...west winds 20 to 30 knots diminishing to 10 to
20 knots. waves 3 to 5 feet occasionally to 7 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 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. a slight chance of rain showers 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 2 to 4 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 calm to 2 feet, then building
to 6 to 9 feet occasionally to 11 feet. 

$$

fzus63 kmqt 091401
glfls 
expires:202604092000;;083859

open lake forecast for lake superior
national weather service marquette mi
1000 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 29.6 inch low over far northeastern ontario this morning reaches 
james bay by 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-
1000 am edt thu apr 9 2026

.rest of today...west winds 20 to 30 knots diminishing to 15 to
25 knots late. waves 6 to 9 feet occasionally to 11 feet
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. a slight chance of rain showers 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 1 to 3 feet, then building to 6 to 9 feet occasionally to
11 feet. 

$$