fzus63 kmqt 130201
glfls 
expires:202607130800;;874820

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt sun jul 12 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... 

zonal flow at around 29.9 to 30.0 inches over lake superior tonight 
through monday gives way to weak 29.9 inch troughing from northern 
ontario monday evening as the parent 29.5 inch low moves from far 
northern ontario into hudson bay. however, ridging builds back in to 
30.0 inches over lake superior by tuesday as two highs, one over the 
mid-mississippi and the other over the canadian prairies, weaken 
with time. high pressure ridging of around 30.0 to 30.1 inches 
remains over the lake through much of the rest of the work week, 
although a weakening 29.8 inch low lifting through the northern 
plains could bring 29.9 inch troughing back over the western lake by 
friday. 




lsz162-130800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt sun jul 12 2026 /900 pm cdt sun jul 12 2026/

.rest of tonight...southwest winds 15 to 25 knots diminishing to
10 to 20 knots late. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.monday...southwest winds 15 to 25 knots increasing to 20 to
30 knots late. waves building to 3 to 6 feet occasionally to
8 feet. 
.monday night...southwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. waves subsiding to 2 to 4 feet. 
.tuesday...southwest winds 10 to 20 knots veering west by mid
afternoon. waves subsiding to calm to 2 feet. 
.tuesday night...north winds 5 to 15 knots. waves calm to 2 feet.
.wednesday...north winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.wednesday night...west winds 5 to 15 knots veering north after
midnight. waves calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 
.friday...northeast winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 130201
glfls 
expires:202607130800;;874821

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt sun jul 12 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... 

zonal flow at around 29.9 to 30.0 inches over lake superior tonight 
through monday gives way to weak 29.9 inch troughing from northern 
ontario monday evening as the parent 29.5 inch low moves from far 
northern ontario into hudson bay. however, ridging builds back in to 
30.0 inches over lake superior by tuesday as two highs, one over the 
mid-mississippi and the other over the canadian prairies, weaken 
with time. high pressure ridging of around 30.0 to 30.1 inches 
remains over the lake through much of the rest of the work week, 
although a weakening 29.8 inch low lifting through the northern 
plains could bring 29.9 inch troughing back over the western lake by 
friday. 




lsz263-130800-
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 pm edt sun jul 12 2026

.rest of tonight...southwest winds 20 to 30 knots diminishing to
15 to 25 knots late. waves 3 to 6 feet occasionally to 8 feet. 
.monday...southwest winds 15 to 25 knots increasing to 20 to
30 knots late. waves subsiding to 3 to 5 feet occasionally to
7 feet, then building to 5 to 8 feet occasionally to 10 feet. 
.monday night...southwest winds 20 to 30 knots. waves subsiding
to 4 to 7 feet occasionally to 9 feet. 
.tuesday...west winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves subsiding
to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing southwest by
mid afternoon. waves calm to 2 feet. 
.wednesday night...west winds 5 to 15 knots veering north after
midnight. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 

$$