fzus63 kmqt 042001
glfls 
expires:202609050800;;908142

open lake forecast for lake superior
national weather service marquette mi
401 pm edt fri sep 4 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...

high pressure ridging builds to 30.1 inches over lake superior by 
saturday afternoon, remaining through sunday night. the ridge 
briefly builds further to 30.2 inches on monday as a 30.4 inch high 
passes eastward over far northern ontario. meanwhile, a 29.6 inch 
low develops off the northern rockies. the low then tracks northeast 
to james bay, deepening to 29.3 inches by wednesday afternoon. this 
sends a 29.7 inch trough over lake superior tuesday night and 
wednesday.




lsz162-050800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt fri sep 4 2026 /301 pm cdt fri sep 4 2026/

.late this afternoon...northeast winds 15 to 25 knots. a slight
chance of showers. waves 3 to 5 feet occasionally to 7 feet
subsiding to 2 to 4 feet. 
.tonight...northeast winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. patchy fog after midnight. waves
subsiding to calm to 2 feet. 
.saturday...northeast winds 10 to 20 knots. patchy fog through
early afternoon. waves calm to 2 feet. 
.saturday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.sunday...east winds 5 to 15 knots backing northeast by mid
afternoon. a slight chance of showers by mid afternoon. waves
calm to 2 feet. 
.sunday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.monday...east winds 10 to 20 knots increasing to gales to
35 knots by mid afternoon. a chance of showers. waves building to
4 to 7 feet occasionally to 9 feet. 
.monday night...east gales to 35 knots becoming southeast 20 to
30 knots after midnight. showers. waves building to 5 to 8 feet
occasionally to 10 feet. 
.tuesday...south winds 20 to 30 knots veering west. a chance of
showers and thunderstorms. waves subsiding to 1 to 3 feet. 
.wednesday...west gales to 40 knots becoming northwest 20 to
30 knots. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 042001
glfls 
expires:202609050800;;908143

open lake forecast for lake superior
national weather service marquette mi
401 pm edt fri sep 4 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...

high pressure ridging builds to 30.1 inches over lake superior by 
saturday afternoon, remaining through sunday night. the ridge 
briefly builds further to 30.2 inches on monday as a 30.4 inch high 
passes eastward over far northern ontario. meanwhile, a 29.6 inch 
low develops off the northern rockies. the low then tracks northeast 
to james bay, deepening to 29.3 inches by wednesday afternoon. this 
sends a 29.7 inch trough over lake superior tuesday night and 
wednesday.




lsz263-050800-
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 fri sep 4 2026

.late this afternoon...northeast winds 15 to 25 knots. a slight
chance of showers. waves 2 to 4 feet. 
.tonight...northeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. a slight chance of showers through
midnight. patchy fog after midnight. waves subsiding to calm to
2 feet. 
.saturday...northeast winds 5 to 15 knots increasing to 10 to
20 knots late. waves calm to 2 feet. 
.saturday night...east winds 5 to 15 knots becoming southeast
less than 10 knots late. waves calm to 2 feet. 
.sunday...southeast winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.sunday night...east winds 5 to 15 knots becoming south 10 to
20 knots after midnight. waves calm to 2 feet. 
.monday...east winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. a chance of showers. waves building to 3 to
6 feet occasionally to 8 feet. 
.monday night...east winds 20 to 30 knots becoming southeast
gales to 35 knots after midnight. a chance of showers through
midnight, then showers likely after midnight. waves building to
4 to 7 feet occasionally to 9 feet. 
.tuesday...south gales to 35 knots veering southwest. showers. a
chance of showers. waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 2 to 4 feet. 
.wednesday...west gales to 40 knots veering northwest. waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet. 

$$