fzus63 kmqt 092002
glfls 
expires:202610100800;;813049

open lake forecast for lake superior
national weather service marquette mi
402 pm edt fri oct 9 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...

a 30.2 inch surface high continues to expand over the ohio river 
valley this afternoon, resulting in 30.1 inch ridging over lake 
superior. this ridge is separating a pair of 29.4 inch lows, one 
over southern alberta and one off the labrador coast. throughout the 
day and into saturday morning, the high will build to 30.4 inches 
over new york as the alberta low moves to southern saskatchewan and 
the north plains. meanwhile, 29.7 inch hurricane isaias will move up 
the alabama/mississippi state line, eventually helping to kick the 
high east as it weakens. by early sunday morning, the canada low 
will split into 2 weaker 29.6 inch lows, one settling over the 
central plains and one moving from northern minnesota to northern 
ontario. this will create weak 29.8 inch troughing over lake 
superior for sunday, deepening to 29.7 inches by monday evening. 
meanwhile, the high will shift to the new england coastline then 
over the atlantic, ushered east by the tropical remnants at 29.8 
inches as they move into the ne conus. the colorado low crosses the 
great lakes basin early next week, followed by 30.2 inch high 
pressure for the midweek.




lsz162-100800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
402 pm edt fri oct 9 2026 /302 pm cdt fri oct 9 2026/

.late this afternoon...east winds 15 to 25 knots. waves 1 to
3 feet building to 2 to 4 feet. 
.tonight...east winds 15 to 25 knots veering southeast after
midnight, then diminishing to 10 to 20 knots late. waves building
to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet. 
.saturday...southeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then becoming south 20 to 30 knots
late. waves subsiding to 1 to 3 feet. 
.saturday night...south winds 20 to 30 knots veering southwest
after midnight, then diminishing to 15 to 25 knots late. waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet. 
.sunday...southwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.sunday night...northeast winds 10 to 20 knots increasing to
20 to 30 knots after midnight. a chance of showers. waves
building to 4 to 7 feet occasionally to 9 feet. 
.monday...northeast gales to 35 knots. a chance of showers. waves
building to 5 to 9 feet occasionally to 11 feet. 
.monday night...northeast winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. showers likely through midnight.
waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.tuesday...northeast winds 10 to 20 knots becoming north 5 to
15 knots. waves subsiding to calm to 2 feet. 
.wednesday...east winds 5 to 15 knots increasing to 10 to
20 knots. a chance of showers. waves building to 1 to 3 feet. 

$$

fzus63 kmqt 092002
glfls 
expires:202610100800;;813050

open lake forecast for lake superior
national weather service marquette mi
402 pm edt fri oct 9 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...

a 30.2 inch surface high continues to expand over the ohio river 
valley this afternoon, resulting in 30.1 inch ridging over lake 
superior. this ridge is separating a pair of 29.4 inch lows, one 
over southern alberta and one off the labrador coast. throughout the 
day and into saturday morning, the high will build to 30.4 inches 
over new york as the alberta low moves to southern saskatchewan and 
the north plains. meanwhile, 29.7 inch hurricane isaias will move up 
the alabama/mississippi state line, eventually helping to kick the 
high east as it weakens. by early sunday morning, the canada low 
will split into 2 weaker 29.6 inch lows, one settling over the 
central plains and one moving from northern minnesota to northern 
ontario. this will create weak 29.8 inch troughing over lake 
superior for sunday, deepening to 29.7 inches by monday evening. 
meanwhile, the high will shift to the new england coastline then 
over the atlantic, ushered east by the tropical remnants at 29.8 
inches as they move into the ne conus. the colorado low crosses the 
great lakes basin early next week, followed by 30.2 inch high 
pressure for the midweek.




lsz263-100800-
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-
402 pm edt fri oct 9 2026

.late this afternoon...east winds 10 to 20 knots. waves calm to
2 feet. 
.tonight...east winds 20 to 30 knots becoming southeast 15 to
25 knots after midnight. waves building to 3 to 6 feet
occasionally to 8 feet. 
.saturday...southeast winds 15 to 25 knots veering south in the
afternoon, then increasing to 20 to 30 knots late. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.saturday night...south winds 20 to 30 knots veering southwest
late. waves building to 3 to 6 feet occasionally to 8 feet. 
.sunday...southwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.sunday night...northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. a chance of showers. waves
building to 4 to 7 feet occasionally to 9 feet. 
.monday...northeast gales to 35 knots. a chance of showers. waves
building to 5 to 9 feet occasionally to 11 feet. 
.monday night...northeast winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. a chance of rain showers. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.tuesday...north winds 10 to 20 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 
.wednesday...east winds 5 to 15 knots becoming southeast 10 to
20 knots. a chance of showers. waves building to 1 to 3 feet. 

$$