FVXX22 KNES 211629 VA ADVISORY DTG: 20170821/1629Z VAAC: WASHINGTON VOLCANO: POPOCATEPETL 341090 PSN: N1901 W09837 AREA: MEXICO SUMMIT ELEV: 17802 FT (5426 M) ADVISORY NR: 2017/072 INFO SOURCE: MEXICO CITY MWO. ERUPTION DETAILS: ERUPTION RPRTD TO FL250 MOVG W 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