fzus63 kmqt 302001
glfls 
expires:202610010800;;317204

open lake forecast for lake superior
national weather service marquette mi
401 pm edt wed sep 30 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 29.0 inch low over hudson bay this afternoon has caused a 29.7 
inch trough over lake superior. 29.8 inch troughing lingers over the 
lake through thursday morning between the canadian low and another 
29.7 low over the south plains. high pressure builds to 30.2 inches 
over the northern plains thursday night into friday before shifting 
east to the great lakes friday night and saturday. a weak 29.9 inch 
trough crosses lake superior saturday night and sunday, with 30.3 
inch high pressure quickly returning sunday night into monday. 




lsz162-010800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt wed sep 30 2026 /301 pm cdt wed sep 30 2026/

.late this afternoon...southwest winds 5 to 15 knots. patchy fog.
waves calm to 2 feet. 
.tonight...southwest winds 5 to 15 knots veering west after
midnight, then becoming northwest 10 to 20 knots late. waves calm
to 2 feet. 
.thursday...northwest winds 10 to 20 knots backing west in the
afternoon, then increasing to 15 to 25 knots late. waves calm to
2 feet. 
.thursday night...northwest winds 15 to 25 knots. waves building
to 1 to 3 feet. 
.friday...northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.friday night...west winds 5 to 15 knots backing southwest after
midnight. waves calm to 2 feet. 
.saturday...south winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. a chance of showers. waves calm to
2 feet. 
.saturday night...southwest winds 15 to 25 knots veering west
after midnight. a chance of showers through midnight. waves
building to 1 to 3 feet. 
.sunday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet. 
.monday...northwest winds 5 to 15 knots becoming south 10 to
20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 302001
glfls 
expires:202610010800;;317205

open lake forecast for lake superior
national weather service marquette mi
401 pm edt wed sep 30 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 29.0 inch low over hudson bay this afternoon has caused a 29.7 
inch trough over lake superior. 29.8 inch troughing lingers over the 
lake through thursday morning between the canadian low and another 
29.7 low over the south plains. high pressure builds to 30.2 inches 
over the northern plains thursday night into friday before shifting 
east to the great lakes friday night and saturday. a weak 29.9 inch 
trough crosses lake superior saturday night and sunday, with 30.3 
inch high pressure quickly returning sunday night into monday. 




lsz263-010800-
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-
401 pm edt wed sep 30 2026

.late this afternoon...southwest winds 10 to 20 knots. patchy
fog. waves 1 to 3 feet subsiding to calm to 2 feet. 
.tonight...southwest winds 5 to 15 knots veering northwest late.
patchy fog. waves calm to 2 feet. 
.thursday...northwest winds 5 to 15 knots becoming west 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. waves building to 2 to 4 feet. 
.thursday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet. 
.friday...northwest winds 10 to 20 knots backing west by mid
afternoon. waves subsiding to 1 to 3 feet. 
.friday night...west winds 5 to 15 knots backing southwest after
midnight. waves subsiding to calm to 2 feet. 
.saturday...south winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. a chance of showers. waves calm to
2 feet. 
.saturday night...south winds 10 to 20 knots becoming west 15 to
25 knots after midnight. a chance of showers. waves building to
3 to 5 feet occasionally to 7 feet. 
.sunday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet. 
.monday...northwest winds 5 to 15 knots becoming south 10 to
20 knots. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 

$$