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fzus63 kmqt 251358
glfls 
743 

open lake forecast for lake superior
national weather service marquette mi
958 am edt fri sep 25 2020

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...lake superior remains between a 30.1 inch ridge of 
high pressure over new england and a 29.2 inch low pressure system
over northern manitoba today. a 29.6 inch trough that extends
south from that low lift northeastward over lake superior tonight.
slight ridging of around 29.7 inches returns briefly saturday
morning, but a 29.5 inch low developing in southern minnesota late
saturday afternoon will lift northeastward across lake superior
saturday evening while deepening to around 29.3 inches. this low
will continue to deepen to 29.1 inches by late sunday as the low
reaches northern quebec. this low pressure system will extend an 
elongated trough of 29.7 inches over lake superior through monday 
before weak ridging over 29.8 inches moves over the lake monday 
night. another trough of 29.6 inches will move over lake superior 
on tuesday.

lsz162-252200-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
958 am edt fri sep 25 2020 /858 am cdt fri sep 25 2020/

.rest of today...south winds 5 to 15 knots backing east in the
afternoon, then backing northeast late. patchy fog. a chance of
showers and thunderstorms by mid afternoon. waves calm to 2 feet.
.tonight...west winds 5 to 15 knots backing southwest late. a
chance of showers and thunderstorms through midnight. patchy fog.
waves calm to 2 feet. 
.saturday...southwest winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. patchy fog
through early afternoon. a chance of showers and a slight chance
of thunderstorms by mid afternoon. waves calm to 2 feet. 
.saturday night...northeast winds 10 to 20 knots backing west
after midnight. showers likely and a slight chance of
thunderstorms through midnight, then a slight chance of showers
after midnight. waves building to 2 to 4 feet. 
.sunday...southwest winds 15 to 25 knots veering west by mid
afternoon. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.sunday night...west winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 
.monday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of showers. waves calm to 2 feet. 
.tuesday...west winds 10 to 20 knots veering northwest. showers
likely, then a chance of showers. waves building to 1 to 3 feet. 

$$
fzus63 kmqt 251358
glfls 

lsz263-252200-
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-
958 am edt fri sep 25 2020

.rest of today...south winds 5 to 15 knots backing east late. a
chance of showers and thunderstorms by mid afternoon. waves calm
to 2 feet. 
.tonight...west winds 5 to 15 knots. a chance of showers and
thunderstorms through midnight. patchy fog. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 
.saturday...southwest winds 5 to 15 knots backing south in the
afternoon, then becoming east 10 to 20 knots late. patchy fog
through early afternoon. a slight chance of showers and
thunderstorms by mid afternoon. waves calm to 2 feet. 
.saturday night...east winds 10 to 20 knots becoming west 15 to
25 knots after midnight. showers and a slight chance of
thunderstorms through midnight, then a slight chance of showers
after midnight. waves building to 2 to 4 feet. 
.sunday...west winds 15 to 25 knots. waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet. 
.sunday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to calm to 2 feet. 
.monday...northwest winds 10 to 20 knots. a chance of showers.
waves calm to 2 feet. 
.tuesday...west winds 10 to 20 knots veering northwest. showers
likely, then a chance of showers. waves building to 2 to 4 feet. 

$$

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