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In a METAR, 'CLR' (clear) versus 'SKC' (sky clear) differ in that:
A.
CLR means less than 1/8 cloud cover; SKC means absolutely no clouds detected
B.
CLR is used by automated stations (no clouds below 12,000 feet detected); SKC is entered by human observers indicating no clouds of any type
C.
They are identical — the terms are interchangeable
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