FVXX21 KNES 310456 VA ADVISORY DTG: 20190731/0456Z VAAC: WASHINGTON VOLCANO: REVENTADOR 352010 PSN: S0004 W07739 AREA: ECUADOR SUMMIT ELEV: 11686 FT (3562 M) ADVISORY NR: 2019/822 INFO SOURCE: GOES-EAST. NWP MODELS. VOLCAT. ERUPTION DETAILS: POSS ONGOING VA EM OBS VA DTG: 31/0430Z OBS VA CLD: SFC/FL150 N0003 W07801 - S0004 W07739 - S0006 W07740 - S0003 W07803 - N0003 W07801 MOV W 25-30KT FCST VA CLD +6HR: 31/1030Z SFC/FL150 NO ASH EXP FCST VA CLD +12HR: 31/1630Z NO ASH EXP FCST VA CLD +18HR: 31/2230Z NO ASH EXP RMK: VA NOT VISIBLE IN STLT IMAGERY UNDER CLR WX CONDS. POSS THIN VA PRESENT. OBS BASED ON NWP MODEL GUIDANCE. ...BOLL NXT ADVISORY: WILL BE ISSUED BY 20190731/1100Z