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fzus63 kmqt 200145
glfls 
622 

open lake forecast for lake superior
national weather service marquette mi
945 pm edt thu oct 19 2017

for waters beyond five 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...a nearly stationary 30.2 inch area of high pressure 
across the mid south pushed a 30.0 inch ridge across lake 
superior this evening that will move off to the east through
friday morning. a 29.1 inch low pressure over the canadian 
prairies midday friday will track toward western hudson bay 
through sunday, passing a 29.7 inch trough across lake superior
saturday night. weak ridging of 30.0 inches will track eastward 
across lake superior late sunday ahead of a 29.7 inch trough 
approaching from the west on monday. 

lsz162-200945-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
945 pm edt thu oct 19 2017 /845 pm cdt thu oct 19 2017/

.rest of tonight...southwest winds 5 to 15 knots. waves calm to
2 feet building to 1 to 3 feet, then subsiding to calm to 2 feet.
.friday...south winds 5 to 15 knots backing east late. waves calm
to 2 feet. 
.friday night...south winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
a slight chance of showers after midnight. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.saturday...south winds 15 to 25 knots. a chance of showers
through early afternoon, then showers likely and a slight chance
of thunderstorms by mid afternoon. waves subsiding to 1 to
3 feet. 
.saturday night...southwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. showers through midnight, then a
chance of showers after midnight. waves 1 to 3 feet. 
.sunday...west winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 
.sunday night...southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.monday...southwest winds 10 to 20 knots becoming northwest 15 to
25 knots. a chance of showers. waves subsiding to calm to 2 feet,
then building to 3 to 5 feet occasionally to 7 feet. 
.tuesday...north winds 20 to 30 knots. a chance of rain showers.
waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 2 to 4 feet. 

$$
fzus63 kmqt 200145
glfls 

lsz263-200945-
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-
945 pm edt thu oct 19 2017

.rest of tonight...southwest winds 5 to 15 knots. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.friday...south winds 5 to 15 knots. waves subsiding to calm to
2 feet. 
.friday night...south winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
a slight chance of showers after midnight. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.saturday...south winds 10 to 20 knots. a chance of showers. a
slight chance of thunderstorms by mid afternoon. waves subsiding
to 1 to 3 feet. 
.saturday night...south winds 10 to 20 knots veering southwest
after midnight. showers likely through midnight, then a chance of
showers after midnight. waves building to 2 to 4 feet. 
.sunday...west winds 10 to 20 knots backing southwest by mid
afternoon. a chance of showers. waves 2 to 4 feet. 
.sunday night...southwest winds 10 to 20 knots. waves 2 to
4 feet. 
.monday...southwest winds 10 to 20 knots becoming northwest 15 to
25 knots. a chance of showers. waves subsiding to 1 to 3 feet,
then building to 3 to 5 feet occasionally to 7 feet. 
.tuesday...north winds 20 to 30 knots. a chance of rain showers.
waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet. 

$$

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