fzus63 kmqt 081401
glfls 
expires:202609082000;;112475

open lake forecast for lake superior
national weather service marquette mi
1001 am 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 morning, a 29.5 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 as 
pressure. ridging begins to build back in saturday, reaching 29.9 
inches by sunday morning.




lsz162-082000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt tue sep 8 2026 /901 am cdt tue sep 8 2026/

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

.rest of today...south winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. a slight chance of showers. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tonight...southwest winds 20 to 30 knots veering west after
midnight. waves building to 3 to 5 feet occasionally to 7 feet. 
.wednesday...west gales to 35 knots. 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 10 to
20 knots after midnight. waves subsiding to calm to 2 feet. 
.thursday...west winds 5 to 15 knots backing south by mid
afternoon. waves calm to 2 feet. 
.thursday night...south winds 10 to 20 knots increasing to 15 to
25 knots after midnight. waves building to 1 to 3 feet. 
.friday...south gales to 35 knots veering west. a chance of
showers, then showers likely. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.saturday...west gales to 35 knots diminishing to 20 to 30 knots.
waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 081401
glfls 
expires:202609082000;;112476

open lake forecast for lake superior
national weather service marquette mi
1001 am 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 morning, a 29.5 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 as 
pressure. ridging begins to build back in saturday, reaching 29.9 
inches by sunday morning.




lsz263-082000-
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-
1001 am edt tue sep 8 2026

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

.rest of today...south winds 20 to 30 knots increasing to gales
to 35 knots in the afternoon, then diminishing to 20 to 30 knots
late. a chance of showers. waves 3 to 6 feet occasionally to
8 feet, then subsiding to 2 to 4 feet. 
.tonight...southwest winds 20 to 30 knots increasing to gales to
35 knots after midnight, then 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 becoming northwest
15 to 25 knots after midnight. waves subsiding to 2 to 4 feet. 
.thursday...northwest winds 10 to 20 knots backing southwest 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, then
showers likely. waves building to 3 to 6 feet occasionally to
8 feet. 
.saturday...west gales to 40 knots. waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 1 to 3 feet. 

$$