What Does COR Mean in a METAR?
COR means a correction to a previously transmitted report. It stands for CORrected report.
COR in a real report
KABC 121755Z COR 21016KT
What it changes for you
COR means an earlier version of this same observation was wrong, and this is
the fix.
The practical consequence is small but real: if you read the earlier version and made a decision on it, that decision was based on a value that has since changed. Worth a second look at the group that matters to you.
Where it sits
Right after the time group, in the same position AUTO occupies. A report can
carry both, since an automated observation can be corrected like any other.
Related codes
Decode a report containing this code
Paste a METAR, TAF, PIREP or SIGMET into the WxDecoder decoder. Every group comes back in plain English. The raw code sits beside it, so you can check the decode rather than trust it.
Frequently asked questions
What does COR mean in a METAR?
Corrected. The report replaces an earlier transmission of the same observation that contained an error. It is a fix to what was sent, not a new observation of changed conditions.
What is the difference between COR and AMD?
COR corrects a transmission error in a report already sent. AMD applies to TAFs and means the forecast has been changed because it no longer describes what is expected. One fixes a mistake, the other changes a prediction.