FVXX20 KNES 171654 VA ADVISORY DTG: 20130817/1654Z VAAC: WASHINGTON VOLCANO: POPOCATEPETL 1401-09 PSN: N1901 W09837 AREA: MEXICO SUMMIT ELEV: 17802 FT (5426 M) ADVISORY NR: 2013/235 INFO SOURCE: MEXICO CITY MWO. GOES-13. VOLCANO WEB CAMERA. ERUPTION DETAILS: VA EXHALATION RPRTD AT 17/1611Z 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