A possible volcanic ash emission was reported for Reventador. Ash cloud height could not be observed due to weather conditions; forecasts indicate possible ash up to FL150 moving west as of October 17, 2026, 16:30 UTC.Original VAAC bulletin:FVXX21 at 16:56 UTC, 17/10/26 from KNESVA ADVISORYDTG: 20261017/1653ZVAAC: WASHINGTONVOLCANO: REVENTADOR 352010PSN: S0004 W07739AREA: ECUADORSOURCE ELEV: 11686 FT AMSLADVISORY NR: 2026/1087INFO SOURCE: GOES-19. NWP MODELS. ERUPTION DETAILS: POSS VA EMEST VA DTG: 17/1630ZEST VA CLD: SFC/FL150 N0001 W07752 - S0004 W07739- S0005 W07739 - S0007 W07753 - N0001 W07752 MOVW 10KT FCST VA CLD +6HR: 17/2230Z SFC/FL150 N0002 W07747- S0004 W07739 - S0005 W07739 - S0006 W07750 -N0002 W07747 FCST VA CLD +12HR: 18/0430Z SFC/FL150 N0006W07746 - S0004 W07738 - S0005 W07739 - S0003W07752 - N0006 W07746 FCST VA CLD +18HR: 18/1030Z NO VA EXPRMK: VA EM/CLD NOT OBSD IN SAT DUE TO MET CLD.WEBCAM OBSC BY MET CLD AS WELL. VA FL/DIR BASEDON PREV ADVY AND MDL GUIDANCE. NWP MDL FCSTSLIGHTLY VEERING THRU T+12HRS. ...ZENGNXT ADVISORY: WILL BE ISSUED BY 20261017/2300Z