fzus63 kmqt 082001
glfls 
expires:202609090800;;127670

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue sep 8 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, a 29.4 inch low currently over the canadian prairies 
swings northeast toward northern quebec, deepening to 29.1 by the 
time it reaches hudson bay wednesday afternoon. this sends a 29.8 
inch trough over lake superior and drives gusty surface southerly 
flow on lake superior through tuesday evening, at which point winds 
shift west with frontal passage. strong postfrontal westerlies 
persist until thursday morning; widespread gale-force winds are 
anticipated. ridging to 30.0 inches and subsequent calmer conditions 
follow until friday morning, when a trough of 29.3 inches tracks 
from the great plains north toward hudson bay. friday through 
saturday morning, a tight pressure gradient between 29.6 and 29.9 
inches sits over lake superior as the plains shifts rapidly north, 
tracking through minnesota. expect breezy southerly flow friday 
afternoon through saturday morning as a result of this low's 
passage, and strong westerlies throughout the day on saturday. 
ridging begins to build back in saturday, reaching 29.9 inches by 
sunday morning.




lsz162-090800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt tue sep 8 2026 /301 pm cdt tue sep 8 2026/

...gale watch in effect from wednesday morning through wednesday
afternoon...

.late this afternoon...south winds 15 to 25 knots. a slight
chance of showers and thunderstorms. waves 1 to 3 feet. 
.tonight...southwest winds 15 to 25 knots becoming west 20 to
30 knots late. waves building to 3 to 5 feet occasionally to
7 feet. 
.wednesday...west winds 20 to 30 knots increasing to gales to
35 knots in the afternoon, then diminishing to 20 to 30 knots
late. waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet. 
.wednesday night...west winds 15 to 25 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 
.thursday...west winds 5 to 15 knots becoming south 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.thursday night...south winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. waves building to 1 to 3 feet. 
.friday...southwest winds 20 to 30 knots backing south by mid
afternoon. a chance of showers by mid afternoon. waves building
to 2 to 4 feet. 
.friday night...south winds 20 to 30 knots veering southwest
after midnight. showers and a chance of thunderstorms. waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet. 
.saturday...west winds 20 to 30 knots diminishing to 15 to
25 knots. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet. 
.sunday...west winds 10 to 20 knots becoming north 5 to 15 knots.
waves building to 1 to 3 feet. 

$$

fzus63 kmqt 082001
glfls 
expires:202609090800;;127671

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue sep 8 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, a 29.4 inch low currently over the canadian prairies 
swings northeast toward northern quebec, deepening to 29.1 by the 
time it reaches hudson bay wednesday afternoon. this sends a 29.8 
inch trough over lake superior and drives gusty surface southerly 
flow on lake superior through tuesday evening, at which point winds 
shift west with frontal passage. strong postfrontal westerlies 
persist until thursday morning; widespread gale-force winds are 
anticipated. ridging to 30.0 inches and subsequent calmer conditions 
follow until friday morning, when a trough of 29.3 inches tracks 
from the great plains north toward hudson bay. friday through 
saturday morning, a tight pressure gradient between 29.6 and 29.9 
inches sits over lake superior as the plains shifts rapidly north, 
tracking through minnesota. expect breezy southerly flow friday 
afternoon through saturday morning as a result of this low's 
passage, and strong westerlies throughout the day on saturday. 
ridging begins to build back in saturday, reaching 29.9 inches by 
sunday morning.




lsz263-090800-
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 tue sep 8 2026

...gale warning in effect from wednesday morning through
wednesday evening...

.late this afternoon...south winds 15 to 25 knots. a slight
chance of showers and thunderstorms. waves 2 to 4 feet. 
.tonight...south winds 20 to 30 knots veering west late. waves
building to 4 to 7 feet occasionally to 9 feet. 
.wednesday...west gales to 40 knots. waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet. 
.wednesday night...west gales to 35 knots diminishing to 15 to
25 knots after midnight, then becoming northwest 10 to 20 knots
late. waves subsiding to 2 to 4 feet. 
.thursday...northwest winds 5 to 15 knots becoming southwest
10 to 20 knots by mid afternoon. waves subsiding to calm to
2 feet. 
.thursday night...south winds 10 to 20 knots increasing to 20 to
30 knots after midnight. waves building to 2 to 4 feet. 
.friday...south gales to 40 knots. a chance of showers by mid
afternoon. waves building to 3 to 6 feet occasionally to 8 feet. 
.friday night...south gales to 35 knots veering southwest after
midnight. showers and a chance of thunderstorms. waves building
to 3 to 6 feet occasionally to 8 feet. 
.saturday...west gales to 35 knots. waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 1 to 3 feet. 
.sunday...west winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 

$$