fzus63 kmqt 022001
glfls 
expires:202510030800;;999472

open lake forecast for lake superior
national weather service marquette mi
401 pm edt thu oct 2 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...

30.5 inch high pressure centered over new england extends 30.2 inch 
ridging over the lake the rest of this afternoon before weakening to 
30.1 inches by this evening as the high settles further south. 
troughing over the plains then deepens to 29.6 inches on friday, 
becoming centered over the dakotas friday night. this lifts towards 
lake winnipeg on saturday while a 29.4 inch low develops off of the 
colorado rockies. this second low then lifts northeast on sunday to 
northwestern ontario, quickly reaching far northern quebec by monday 
morning as it deepens to at least 29.2 inches. this results in at 
least 29.8 inch troughing over lake superior by saturday, which 
holds until monday morning. in it's wake, a 30.3 inch high pressure 
moving across the northern plains brings ridging of 30.2 inches back 
over lake superior by monday evening. a reinforcing 30.4 inch high 
pressure dropping down from the canadian prairies into the northern 
plains on tuesday brings 30.3 inch ridging to lake superior by 
tuesday evening.



lsz162-030800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt thu oct 2 2025 /301 pm cdt thu oct 2 2025/

.late this afternoon...east winds 5 to 15 knots. a slight chance
of showers and thunderstorms. waves calm to 2 feet. 
.tonight...southwest winds 5 to 15 knots. a slight chance of
showers and thunderstorms. waves calm to 2 feet. 
.friday...southwest winds 5 to 15 knots backing east in the
afternoon, then becoming northeast 10 to 20 knots late. waves
calm to 2 feet. 
.friday night...northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then veering east late. waves calm
to 2 feet. 
.saturday...south winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. waves building to 1 to 3 feet. 
.saturday night...south winds 20 to 30 knots. waves building to
3 to 5 feet occasionally to 7 feet. 
.sunday...south winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. waves building to 5 to 8 feet
occasionally to 10 feet. 
.sunday night...southwest gales to 35 knots becoming west 15 to
25 knots after midnight. waves subsiding to 2 to 4 feet. 
.monday...west winds 10 to 20 knots. waves subsiding to calm to
2 feet. 
.tuesday...west winds 15 to 25 knots becoming northwest 10 to
20 knots. waves building to 2 to 4 feet, then subsiding to calm
to 2 feet. 

$$

fzus63 kmqt 022001
glfls 
expires:202510030800;;999473

open lake forecast for lake superior
national weather service marquette mi
401 pm edt thu oct 2 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...

30.5 inch high pressure centered over new england extends 30.2 inch 
ridging over the lake the rest of this afternoon before weakening to 
30.1 inches by this evening as the high settles further south. 
troughing over the plains then deepens to 29.6 inches on friday, 
becoming centered over the dakotas friday night. this lifts towards 
lake winnipeg on saturday while a 29.4 inch low develops off of the 
colorado rockies. this second low then lifts northeast on sunday to 
northwestern ontario, quickly reaching far northern quebec by monday 
morning as it deepens to at least 29.2 inches. this results in at 
least 29.8 inch troughing over lake superior by saturday, which 
holds until monday morning. in it's wake, a 30.3 inch high pressure 
moving across the northern plains brings ridging of 30.2 inches back 
over lake superior by monday evening. a reinforcing 30.4 inch high 
pressure dropping down from the canadian prairies into the northern 
plains on tuesday brings 30.3 inch ridging to lake superior by 
tuesday evening.



lsz263-030800-
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 thu oct 2 2025

.late this afternoon...south winds 10 to 20 knots. waves calm to
2 feet. 
.tonight...southwest winds 5 to 15 knots. a slight chance of
showers and thunderstorms. waves calm to 2 feet. 
.friday...west winds less than 10 knots veering northeast in the
afternoon, then becoming east 5 to 15 knots late. waves calm to
2 feet. 
.friday night...east winds 5 to 15 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. waves calm to
2 feet. 
.saturday...south winds 15 to 25 knots. waves building to 2 to
4 feet. 
.saturday night...south winds 15 to 25 knots increasing to 20 to
30 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet. 
.sunday...south gales to 40 knots. waves building to 5 to 8 feet
occasionally to 10 feet. 
.sunday night...southwest gales to 40 knots becoming west 20 to
30 knots after midnight. waves subsiding to 4 to 7 feet
occasionally to 9 feet. 
.monday...west winds 10 to 20 knots. waves subsiding to calm to
2 feet, then building to 1 to 3 feet. 
.tuesday...west winds 15 to 25 knots veering northwest. waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet. 

$$