fzus63 kmqt 130203
glfls 
expires:202507130800;;346539

open lake forecast for lake superior
national weather service marquette mi
1002 pm edt sat jul 12 2025

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 29.8 inch low deepens further to 29.4 inches tonight as it drifts 
northeast towards hudson bay while 30.0 inch high pressure builds 
just south of the great lakes basin. the high maintains strength and 
position on sunday while the low deepens to 29.2 inches over hudson 
bay. on monday, weak ridging near 30.0 inches builds over lake 
superior as 29.7 inch low pressure forms over the high plains. this 
low will pass a 29.9 inch trough over lake superior tuesday before 
30.1 inch high pressure builds in its wake over northern ontario 
wednesday into thursday.



lsz162-130800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1002 pm edt sat jul 12 2025 /902 pm cdt sat jul 12 2025/

.rest of tonight...west winds 10 to 20 knots backing southwest
after midnight, then increasing to 15 to 25 knots late. areas of
smoke. waves calm to 2 feet. 
.sunday...southwest winds 15 to 25 knots. areas of smoke. waves
building to 1 to 3 feet. 
.sunday night...southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. a slight chance of showers and
thunderstorms through midnight. areas of smoke. waves subsiding
to calm to 2 feet. 
.monday...west winds 10 to 20 knots backing southwest by mid
afternoon. areas of smoke through early afternoon. waves calm to
2 feet. 
.monday night...east winds 5 to 15 knots. a chance of showers and
a slight chance of thunderstorms. waves calm to 2 feet. 
.tuesday...northeast winds 10 to 20 knots. a chance of showers
through early afternoon, then showers likely by mid afternoon.
waves calm to 2 feet. 
.tuesday night...northeast winds 10 to 20 knots. showers likely
through midnight. a chance of thunderstorms. a chance of showers
after midnight. waves calm to 2 feet. 
.wednesday...northeast winds 10 to 20 knots. a chance of showers.
waves calm to 2 feet. 
.thursday...northeast winds 10 to 20 knots becoming northwest
5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 130203
glfls 
expires:202507130800;;346540

open lake forecast for lake superior
national weather service marquette mi
1002 pm edt sat jul 12 2025

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 29.8 inch low deepens further to 29.4 inches tonight as it drifts 
northeast towards hudson bay while 30.0 inch high pressure builds 
just south of the great lakes basin. the high maintains strength and 
position on sunday while the low deepens to 29.2 inches over hudson 
bay. on monday, weak ridging near 30.0 inches builds over lake 
superior as 29.7 inch low pressure forms over the high plains. this 
low will pass a 29.9 inch trough over lake superior tuesday before 
30.1 inch high pressure builds in its wake over northern ontario 
wednesday into thursday.



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-
1002 pm edt sat jul 12 2025

.rest of tonight...west winds 10 to 20 knots. areas of smoke.
waves 1 to 3 feet. 
.sunday...southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. areas of smoke. waves building to 2 to
4 feet. 
.sunday night...southwest winds 10 to 20 knots becoming west 5 to
15 knots late. areas of smoke through midnight. a slight chance
of showers and thunderstorms through midnight. waves subsiding to
1 to 3 feet. 
.monday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves subsiding to calm to 2 feet. 
.monday night...southeast winds 5 to 15 knots. a chance of
showers. a slight chance of thunderstorms after midnight. waves
calm to 2 feet. 
.tuesday...south winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 
.tuesday night...north winds 5 to 15 knots veering northeast
after midnight. showers likely through midnight. a chance of
thunderstorms. a chance of showers after midnight. waves calm to
2 feet. 
.wednesday...northeast winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots backing west. waves
calm to 2 feet. 

$$