fzus63 kmqt 120801
glfls 
expires:202607122000;;835230

open lake forecast for lake superior
national weather service marquette mi
400 am 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... 

high pressure of 30.1 inches is draped from quebec to the upper 
great lakes this morning. this surface high then shifts south toward 
the lower great lakes as pressure falls over the lake to 29.9 inches 
by sunday night. early next week a strong low of around 29.3 inches 
tracks northeast from the northern plains toward hudson bay, keeping 
pressure over lake superior at 29.9 inches through tuesday morning. 
wednesday, high pressure extending from the canadian prairies to the 
southern appalachians weakens slightly as the canadian low deepens 
to 29.1 inches in northern quebec. lake superior remains under weak 
high pressure wednesday into thursday at 30.0 inches.




lsz162-122000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt sun jul 12 2026 /300 am cdt sun jul 12 2026/

.early this morning...southwest winds 5 to 15 knots. a chance of
showers and thunderstorms. waves calm to 2 feet. 
.today...southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. waves building to 2 to 4 feet. 
.tonight...southwest winds 15 to 25 knots. waves subsiding to
1 to 3 feet. 
.monday...southwest winds 10 to 20 knots increasing to 20 to
30 knots. waves building to 3 to 5 feet occasionally to 7 feet. 
.monday night...southwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet. 
.tuesday...west winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.tuesday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves calm to 2 feet. 
.wednesday...north winds 5 to 15 knots. waves calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 

$$

fzus63 kmqt 120801
glfls 
expires:202607122000;;835231

open lake forecast for lake superior
national weather service marquette mi
400 am 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... 

high pressure of 30.1 inches is draped from quebec to the upper 
great lakes this morning. this surface high then shifts south toward 
the lower great lakes as pressure falls over the lake to 29.9 inches 
by sunday night. early next week a strong low of around 29.3 inches 
tracks northeast from the northern plains toward hudson bay, keeping 
pressure over lake superior at 29.9 inches through tuesday morning. 
wednesday, high pressure extending from the canadian prairies to the 
southern appalachians weakens slightly as the canadian low deepens 
to 29.1 inches in northern quebec. lake superior remains under weak 
high pressure wednesday into thursday at 30.0 inches.




lsz263-122000-
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 sun jul 12 2026

.early this morning...southwest winds 10 to 20 knots. a slight
chance of showers and thunderstorms. waves calm to 2 feet. 
.today...southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. a slight chance of showers and
thunderstorms through early afternoon. waves building to 2 to
4 feet. 
.tonight...southwest winds 15 to 25 knots veering west late.
waves building to 3 to 5 feet occasionally to 7 feet. 
.monday...southwest winds 10 to 20 knots increasing to 20 to
30 knots. waves subsiding to 2 to 4 feet, then building to 4 to
7 feet occasionally to 9 feet. 
.monday night...southwest winds 20 to 30 knots veering west after
midnight. waves 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...southwest winds 5 to 15 knots veering west. waves
calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots veering east. waves
calm to 2 feet. 

$$