fzus63 kmqt 160201
glfls 
expires:202509160800;;054122

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt mon sep 15 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 30.3 inch high over quebec will maintain a 30.1 inch ridge over 
lake superior through tonight. on tuesday the high will begin to 
weaken as it moves to and over new england. a 29.7 inch low moving 
through far northern ontario into the hudson bay area tuesday night 
brings troughing of 30.0 inches back to lake superior tuesday night 
through wednesday, before a 30.3 inch high stretching from the 
canadian prairies to northern ontario brings 30.1 inch ridging back 
over lake superior wednesday night into thursday morning. ridging is 
expected to strengthen to 30.3 inches on friday as the high digs 
through northern ontario towards the st. lawrence seaway. the ridge 
will weaken to 30.1 inches on saturday as the high pressure pushes 
away from the area, into the northeastern u.s.



lsz162-160800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt mon sep 15 2025 /901 pm cdt mon sep 15 2025/

.rest of tonight...northeast winds 5 to 15 knots veering east
after midnight, then veering south late. a slight chance of
showers after midnight. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday night...southwest winds 5 to 15 knots veering west late.
a slight chance of showers and thunderstorms after midnight.
waves calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest by mid
afternoon. a slight chance of showers and thunderstorms. waves
calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots veering northeast
after midnight. a slight chance of showers and thunderstorms.
waves calm to 2 feet. 
.thursday...northeast winds 10 to 20 knots. waves building to
2 to 4 feet. 
.thursday night...northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet. 
.friday...east winds 15 to 25 knots diminishing to 10 to
20 knots. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet. 
.saturday...east winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of showers. waves subsiding to calm to 2 feet.

$$

fzus63 kmqt 160201
glfls 
expires:202509160800;;054123

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt mon sep 15 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 30.3 inch high over quebec will maintain a 30.1 inch ridge over 
lake superior through tonight. on tuesday the high will begin to 
weaken as it moves to and over new england. a 29.7 inch low moving 
through far northern ontario into the hudson bay area tuesday night 
brings troughing of 30.0 inches back to lake superior tuesday night 
through wednesday, before a 30.3 inch high stretching from the 
canadian prairies to northern ontario brings 30.1 inch ridging back 
over lake superior wednesday night into thursday morning. ridging is 
expected to strengthen to 30.3 inches on friday as the high digs 
through northern ontario towards the st. lawrence seaway. the ridge 
will weaken to 30.1 inches on saturday as the high pressure pushes 
away from the area, into the northeastern u.s.



lsz263-160800-
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-
1001 pm edt mon sep 15 2025

.rest of tonight...southeast winds 5 to 15 knots veering south
after midnight. a slight chance of showers after midnight. waves
calm to 2 feet building to 1 to 3 feet, then subsiding to calm to
2 feet. 
.tuesday...south winds 5 to 15 knots. a slight chance of showers
through early afternoon. waves calm to 2 feet. 
.tuesday night...south winds 5 to 15 knots veering west late. a
slight chance of showers and thunderstorms after midnight. waves
calm to 2 feet. 
.wednesday...west winds 5 to 15 knots. a slight chance of showers
and thunderstorms. waves calm to 2 feet. 
.wednesday night...northeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. a slight chance of showers and
thunderstorms. waves calm to 2 feet. 
.thursday...northeast winds 10 to 20 knots. 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, then building to
2 to 4 feet. 
.friday...east winds 15 to 25 knots diminishing to 10 to
20 knots. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet. 
.saturday...east winds 5 to 15 knots veering southeast. a chance
of showers. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 

$$