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fzus63 kmqt 040801
glfls 
expires:202310041615;;469930

open lake forecast for lake superior
national weather service marquette mi
401 am edt wed oct 4 2023

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...surface high pressure of 30.1 inches is centered over
the northern appalachians, with a 29.4 inch low over manitoba 
deepening to 29.2 inches while lifting to hudson bay on today. an
associated 29.7 inch trough will sweep east, crossing lake 
superior through the afternoon and evening. on thursday, 29.6 
inch low pressure will develop across far southern manitoba into 
adjacent ontario. as this low tracks north of lake superior on 
thursday night, an associated trough will sweep across lake 
superior. over the weekend, a 30.3 inch ridge over the central 
plains will drift east over the plains states while weakening to 
30.1 inches. meanwhile a low will strengthen to 29.4 inches over 
southeastern ontario.


lsz162-041615-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt wed oct 4 2023 /301 am cdt wed oct 4 2023/

.early this morning...south winds 15 to 25 knots. isolated
showers and thunderstorms. waves 2 to 4 feet. 
.today...southwest winds 20 to 30 knots. a slight chance of
thunderstorms through early afternoon. a slight chance of
showers. waves building to 3 to 6 feet occasionally to 8 feet. 
.tonight...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then backing southwest late. a slight
chance of showers after midnight. waves subsiding to 2 to 4 feet.
.thursday...southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, with a few gale force gusts to 35 knots
possible for the afternoon and evening. a slight chance of 
showers. waves building to 5 to 8 feet occasionally to 10 feet.
.thursday night...west winds 20 to 30 knots and a few gale force
gusts to 35 knots possible before diminishing to 15 to 25 knots 
after midnight. a chance of showers. waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 3 to 6 feet 
occasionally to 8 feet. 
.friday...northwest winds 15 to 25 knots becoming north 20 to
30 knots by mid afternoon. showers likely through early
afternoon, then a chance of showers by mid afternoon. waves
subsiding to 3 to 5 feet occasionally to 7 feet, then building to
5 to 8 feet occasionally to 10 feet. 
.friday night...north winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. waves subsiding to 3 to 5 feet
occasionally to 7 feet. 
.saturday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 
.sunday...north winds 5 to 15 knots increasing to 10 to 20 knots.
waves building to 1 to 3 feet. 

$$
fzus63 kmqt 040801
glfls 
expires:202310041615;;469931

open lake forecast for lake superior
national weather service marquette mi
401 am edt wed oct 4 2023

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...surface high pressure of 30.1 inches is centered over
the northern appalachians, with a 29.4 inch low over manitoba 
deepening to 29.2 inches while lifting to hudson bay on today. an
associated 29.7 inch trough will sweep east, crossing lake 
superior through the afternoon and evening. on thursday, 29.6 
inch low pressure will develop across far southern manitoba into 
adjacent ontario. as this low tracks north of lake superior on 
thursday night, an associated trough will sweep across lake 
superior. over the weekend, a 30.3 inch ridge over the central 
plains will drift east over the plains states while weakening to 
30.1 inches. meanwhile a low will strengthen to 29.4 inches over 
southeastern ontario.


lsz263-041615-
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 am edt wed oct 4 2023

.early this morning...south winds 20 to 30 knots. isolated
showers. waves 2 to 4 feet building to 3 to 5 feet occasionally
to 7 feet. 
.today...south winds 20 to 30 knots veering west late. a slight
chance of thunderstorms through early afternoon. a slight chance
of showers. waves building to 3 to 6 feet occasionally to 8 feet.
.tonight...west winds 20 to 30 knots diminishing to 15 to
25 knots after midnight, then becoming southwest 10 to 20 knots
late. waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet. 
.thursday...southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, with a few gale force gusts to 35 knots
possible for the afternoon and evening. a chance of showers. 
waves building to 6 to 9 feet occasionally to 11 feet.
.thursday night...west winds 20 to 30 knots with a few gale force
gusts to 35 knots possible early. a chance of showers. waves 
building to 7 to 10 feet occasionally to 13 feet, then subsiding 
to 5 to 8 feet occasionally to 10 feet.
.friday...northwest winds 20 to 30 knots veering north by mid
afternoon. a chance of showers through early afternoon, then
showers likely by mid afternoon. waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 5 to 8 feet occasionally
to 10 feet. 
.friday night...north winds 20 to 30 knots. a chance of rain
showers. waves building to 5 to 9 feet occasionally to 11 feet. 
.saturday...north winds 20 to 30 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 
.sunday...north winds 10 to 20 knots. waves building to 1 to
3 feet, then subsiding to calm to 2 feet. 

$$
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