A possible light volcanic ash emission was reported for Reventador. Ash was not observed in satellite or webcam images due to cloud cover; forecasts indicate possible ash movement to the west-northwest up to FL150 through the next 6 hours.Original VAAC bulletin:FVXX21 at 18:14 UTC, 01/11/26 from KNESVA ADVISORYDTG: 20261101/1810ZVAAC: WASHINGTONVOLCANO: REVENTADOR 352010PSN: S0004 W07739AREA: ECUADORSOURCE ELEV: 11686 FT AMSLADVISORY NR: 2026/1153INFO SOURCE: GOES-19. NWP MODELS. ERUPTION DETAILS: PSBL LGT VA EM EST VA DTG: 01/1730ZEST VA CLD: SFC/FL150 N0007 W07748 - S0004 W07738- S0006 W07740 - N0003 W07752 - N0007 W07748 MOVNW 5KT FCST VA CLD +6HR: 01/2330Z SFC/FL150 N0004 W07759- S0004 W07738 - S0005 W07739 - S0002 W07801 -N0004 W07759 FCST VA CLD +12HR: 02/0530Z NO VA EXPFCST VA CLD +18HR: 02/1130Z NO VA EXPRMK: VA NOT OBS IN WEBCAM OR STLT IMG DUE TO METCLD CVR IN SUMMIT AREA. EXP WNW MOVEMENT THRU T+6HRS. FL AND PRESENT VA BSD ON PAST ACTIVITY. FCSTBSD ON NWP MDLS. ...LINERNXT ADVISORY: WILL BE ISSUED BY 20261102/0015Z