FVXX20 KNES 011258 VA ADVISORY DTG: 20071201/1258Z VAAC: WASHINGTON VOLCANO: POPOCATEPETL PSN: N1901 W09837 AREA: MEXICO SUMMIT ELEV: 17802 FT (5426 M) ADVISORY NR: 2007/020 INFO SOURCE: NOT AVBL ERUPTION DETAILS: NOT AVBL 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