Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym GWC9 is...

GWC9 is

  • Geophysical Weather phenomena, unusual Clouds: Circular Holes in Cloud Decks

GWC9 is also in:

Acronym Definition Searched: SD CVT ILAR BOB CEPAC IDT AEPP 42420 PHA TRA AIP ALARM WWGAB IBL UYS