fzus63 kmqt 052000
glfls 
expires:202609060800;;959206

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sat sep 5 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 of 30.1 inches over lake superior this 
afternoon remains 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 eastern 
hudson bay, deepening to 29.2 inches by wednesday afternoon. this 
sends a 29.7 inch trough over lake superior tuesday night and 
wednesday. weak ridging of 29.9 inches returns to lake superior by 
the end of thursday.




lsz162-060800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt sat sep 5 2026 /300 pm cdt sat sep 5 2026/

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

$$

fzus63 kmqt 052000
glfls 
expires:202609060800;;959207

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sat sep 5 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 of 30.1 inches over lake superior this 
afternoon remains 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 eastern 
hudson bay, deepening to 29.2 inches by wednesday afternoon. this 
sends a 29.7 inch trough over lake superior tuesday night and 
wednesday. weak ridging of 29.9 inches returns to lake superior by 
the end of thursday.




lsz263-060800-
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-
400 pm edt sat sep 5 2026

.late this afternoon...northeast winds 5 to 15 knots. waves calm
to 2 feet. 
.tonight...east winds 5 to 15 knots diminishing to less than
10 knots late. waves calm to 2 feet. 
.sunday...east winds less than 10 knots increasing to 5 to
15 knots late. waves calm to 2 feet. 
.sunday night...east winds 5 to 15 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. waves calm to
2 feet. 
.monday...south winds 10 to 20 knots backing east by mid
afternoon. a slight chance of showers by mid afternoon. waves
calm to 2 feet. 
.monday night...southeast winds 15 to 25 knots becoming south
20 to 30 knots after midnight. a chance of showers through
midnight, then showers after midnight. waves building to 3 to
6 feet occasionally to 8 feet. 
.tuesday...south gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. showers through early afternoon. a chance of
thunderstorms. a chance of showers by mid afternoon. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.tuesday night...southwest gales to 35 knots becoming west gales
to 40 knots after midnight. waves building to 5 to 8 feet
occasionally to 10 feet. 
.wednesday...west gales to 45 knots becoming northwest gales to
40 knots. waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 2 to 4 feet. 
.thursday...northwest winds 10 to 20 knots backing southwest.
waves subsiding to calm to 2 feet, then building to 1 to 3 feet. 

$$