FVXX21 KNES 210122 VA ADVISORY DTG: 20120721/0121Z VAAC: WASHINGTON VOLCANO: POPOCATEPETL 1401-09 PSN: N1901 W09837 AREA: MEXICO SUMMIT ELEV: 17802 FT (5426 M) ADVISORY NR: 2012/256 INFO SOURCE: MEXICO CITY MWO. ERUPTION DETAILS: ERUPTION PRIOR TO 21/0101Z RMK: WE HAVE RECEIVED INFORMATION SUGGESTING A POSSIBLE VA EMISSION. WE WILL GATHER FURTHER INFORMATION AND ISSUE A FULL ADVISORY AS SOON AS POSSIBLE. NXT ADVISORY: AS SOON AS POSSIBLE NNNN