fzus63 kmqt 132001
glfls 
expires:202607140800;;915543

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon jul 13 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... 

this afternoon, lake superior is between a 30.1 to 30.2 inch high 
over the midwest and the southern half of the great lakes and a 29.4 
inch low over hudson bay. the high will remain steady tonight while 
the low shifts to the eastern shores of hudson bay while deepening 
to 29.3 inches. tuesday, despite a 30.1 inch high approaching from 
the canadian prairie, high pressure south of the great lakes weakens 
to 30.0 to 30.1 inches as the hudson low shifts into northern quebec 
at 29.2 inches. wednesday afternoon, the 30.1 inch high will move 
fully into manitoba as the low weakens slightly to 29.3 inches over 
labrador. by thursday night, the high will move over the great lakes 
and northern ontario at 30.1 inches, being flanked to the east by 
29.4 inch low pressure over labrador and 29.7 inch low pressure over 
north dakota and minnesota. the low moves into the great lakes by 
friday night as high pressure shifts to the east coast at 30.0 
inches with another 30.0 inch high building over the canadian 
prairie, which will advance towards the great lakes through the 
weekend.




lsz162-140800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt mon jul 13 2026 /301 pm cdt mon jul 13 2026/

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

$$

fzus63 kmqt 132001
glfls 
expires:202607140800;;915544

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon jul 13 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... 

this afternoon, lake superior is between a 30.1 to 30.2 inch high 
over the midwest and the southern half of the great lakes and a 29.4 
inch low over hudson bay. the high will remain steady tonight while 
the low shifts to the eastern shores of hudson bay while deepening 
to 29.3 inches. tuesday, despite a 30.1 inch high approaching from 
the canadian prairie, high pressure south of the great lakes weakens 
to 30.0 to 30.1 inches as the hudson low shifts into northern quebec 
at 29.2 inches. wednesday afternoon, the 30.1 inch high will move 
fully into manitoba as the low weakens slightly to 29.3 inches over 
labrador. by thursday night, the high will move over the great lakes 
and northern ontario at 30.1 inches, being flanked to the east by 
29.4 inch low pressure over labrador and 29.7 inch low pressure over 
north dakota and minnesota. the low moves into the great lakes by 
friday night as high pressure shifts to the east coast at 30.0 
inches with another 30.0 inch high building over the canadian 
prairie, which will advance towards the great lakes through the 
weekend.




lsz263-140800-
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 mon jul 13 2026

.late this afternoon...southwest winds 20 to 30 knots. waves 3 to
6 feet occasionally to 8 feet building to 4 to 7 feet
occasionally to 9 feet. 
.tonight...southwest winds 20 to 30 knots veering west late.
waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday...west winds 15 to 25 knots diminishing to 10 to
20 knots late. waves subsiding to 2 to 4 feet. 
.tuesday night...west winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...northwest winds less than 10 knots becoming
southwest 5 to 15 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...west winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...north winds 5 to 15 knots veering east by mid
afternoon. waves calm to 2 feet. 
.thursday night...east winds 5 to 15 knots. a chance of showers.
a chance of thunderstorms after midnight. waves calm to 2 feet. 
.friday...east winds 10 to 20 knots backing northeast. a chance
of showers. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 
.saturday...northeast winds 5 to 15 knots backing north. waves
calm to 2 feet. 

$$