Originally Posted by
DIBO
METAR you mean? As ATIS is mainly 'event driven' not clock synchro per se
ATIS goes off air at 50 minutes and is replaced by a new one at about 55 minutes where I am based (KDVT). A runway change or a significant change in weather will result in an earlier update. At my airport it's all manual and subject to errors, such forgetting to run the new recording and using the same letter designator for two ATIS reports in a row. Mostly it's very predictable.