fzus63 kmqt 162001
glfls 
expires:202509170800;;094845

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue sep 16 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 29.7 inch low moving over far northern ontario into the hudson bay 
area tonight brings a 30.0 inch trough over lake superior tonight 
through wednesday. then a 30.3 inch high over manitoba gradually 
shifts over northern ontario wednesday night through friday and 
across new england on saturday. this brings 30.2 inch ridging back 
over lake superior by friday, weakening to 30.0 inches by the end of 
the day saturday. troughing then begins to spread over lake superior 
sunday into the beginning of next week as low pressure deepens over 
the canadian prairie to around 29.5 inches.



lsz162-170800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt tue sep 16 2025 /301 pm cdt tue sep 16 2025/

.late this afternoon...east winds 5 to 15 knots. a slight chance
of showers and thunderstorms. waves calm to 2 feet. 
.tonight...south winds 5 to 15 knots veering west late. a slight
chance of showers and thunderstorms through midnight. patchy fog.
waves calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest in the
afternoon. patchy fog through early afternoon. waves calm to
2 feet. 
.wednesday night...northeast winds 5 to 15 knots increasing to
10 to 20 knots late. a slight chance of thunderstorms through
midnight. a slight chance of showers. waves calm to 2 feet. 
.thursday...northeast winds 10 to 20 knots veering east by mid
afternoon. a slight chance of showers and thunderstorms through
early afternoon. waves building to 2 to 4 feet. 
.thursday night...northeast winds 10 to 20 knots veering east
after midnight. waves subsiding to 1 to 3 feet. 
.friday...east winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. waves building to 2 to 4 feet. 
.friday night...east winds 10 to 20 knots. waves subsiding to
1 to 3 feet. 
.saturday...east winds 10 to 20 knots becoming south 5 to
15 knots. a chance of showers. waves subsiding to calm to 2 feet.
.sunday...south winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 

$$

fzus63 kmqt 162001
glfls 
expires:202509170800;;094846

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue sep 16 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 29.7 inch low moving over far northern ontario into the hudson bay 
area tonight brings a 30.0 inch trough over lake superior tonight 
through wednesday. then a 30.3 inch high over manitoba gradually 
shifts over northern ontario wednesday night through friday and 
across new england on saturday. this brings 30.2 inch ridging back 
over lake superior by friday, weakening to 30.0 inches by the end of 
the day saturday. troughing then begins to spread over lake superior 
sunday into the beginning of next week as low pressure deepens over 
the canadian prairie to around 29.5 inches.



lsz263-170800-
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 tue sep 16 2025

.late this afternoon...south winds 5 to 15 knots. a slight chance
of showers. waves calm to 2 feet. 
.tonight...south winds 5 to 15 knots veering west late. a slight
chance of showers and thunderstorms. waves calm to 2 feet. 
.wednesday...west winds less than 10 knots. patchy fog through
early afternoon. waves calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots veering northeast
after midnight. waves calm to 2 feet. 
.thursday...northeast winds 10 to 20 knots. a slight chance of
showers. waves building to 1 to 3 feet. 
.thursday night...east winds 10 to 20 knots. waves subsiding to
calm to 2 feet, then building to 1 to 3 feet. 
.friday...east winds 10 to 20 knots. waves building to 2 to
4 feet. 
.friday night...east winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. waves subsiding to 1 to 3 feet. 
.saturday...southeast winds 5 to 15 knots veering south. a chance
of showers. waves subsiding to calm to 2 feet. 
.sunday...south winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 

$$