fzus63 kmqt 110801
glfls 
expires:202609112000;;261290

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri sep 11 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...

30.0 inch ridge is exiting eastward as a 29.6 inch trough moves 
across the northern plains. the trough tracks towards hudson bay by 
this afternoon, bringing 29.8 inch troughing to the lake. a cold 
front and 29.7 inch trough passes through on saturday with ridging 
in its wake reaching 30.0 inches by sunday. this strengthens further 
to 30.2 inches monday. 




lsz162-112000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt fri sep 11 2026 /300 am cdt fri sep 11 2026/

.early this morning...southwest winds 15 to 25 knots. waves 1 to
3 feet. 
.today...southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then becoming south 15 to 25 knots
late. waves building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.tonight...south winds 15 to 25 knots veering southwest late.
showers through midnight. a chance of thunderstorms. a chance of
showers after midnight. waves subsiding to calm to 2 feet, then
building to 1 to 3 feet. 
.saturday...west winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. waves 1 to 3 feet. 
.saturday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to calm to 2 feet.
.sunday...northwest winds 10 to 20 knots backing west by mid
afternoon. waves calm to 2 feet. 
.sunday night...northwest winds 5 to 15 knots veering east after
midnight. waves calm to 2 feet. 
.monday...southeast gales to 35 knots veering west. showers.
waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday...west gales to 35 knots becoming northwest 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 110801
glfls 
expires:202609112000;;261291

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri sep 11 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...

30.0 inch ridge is exiting eastward as a 29.6 inch trough moves 
across the northern plains. the trough tracks towards hudson bay by 
this afternoon, bringing 29.8 inch troughing to the lake. a cold 
front and 29.7 inch trough passes through on saturday with ridging 
in its wake reaching 30.0 inches by sunday. this strengthens further 
to 30.2 inches monday. 




lsz263-112000-
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 fri sep 11 2026

.early this morning...southwest winds 20 to 30 knots. waves 2 to
4 feet. 
.today...southwest winds 20 to 30 knots backing south late. waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
1 to 3 feet. 
.tonight...south winds 15 to 25 knots veering southwest late. a
chance of showers through midnight. a chance of thunderstorms.
showers after midnight. waves building to 2 to 4 feet. 
.saturday...west winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. waves building to 3 to 6 feet
occasionally to 8 feet. 
.saturday night...northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. waves subsiding to 2 to 4 feet. 
.sunday...northwest winds 10 to 20 knots backing west by mid
afternoon. waves subsiding to calm to 2 feet. 
.sunday night...northwest winds 5 to 15 knots veering east after
midnight. waves calm to 2 feet. 
.monday...southeast gales to 35 knots becoming west gales to
40 knots. a chance of showers. showers. waves building to 5 to
8 feet occasionally to 10 feet. 
.tuesday...west gales to 40 knots becoming northwest 15 to
25 knots. waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to calm to 2 feet. 

$$