12.6.4 Report Modifier (AUTO or COR). The report modifier, AUTO, identifies the METAR/SPECI as a fully automated report with no human intervention or oversight. In the event of a corrected METAR or SPECI, the report modifier, COR, shall be substituted in place of AUTO.
COR means the automated weather observation was corrected by someone. Example....AWOS Reports 1/2 sm vis an vv001 when the tower can see its clear. The tower would correct it manually.
Good Question, I had forgotten, had to use DynCorp Duats to translate it.
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