Volcanic Ash Advisory Center Washington (VAAC) issued the following report:FVXX20 at 08:46 UTC, 12/11/25 from KNESVA ADVISORYDTG: 20251112/0842ZVAAC: WASHINGTONVOLCANO: REVENTADOR 352010PSN: S0004 W07739AREA: ECUADORSUMMIT ELEV: 11686 FT [3562 M]ADVISORY NR: 2025/1133INFO SOURCE: GOES-19. NWP MODELS. ERUPTION DETAILS: VA EMS ONGOINGEST VA DTG: 12/0810ZEST VA CLD: SFC/FL170 S0004 W07740 - S0006 W07738- S0011 W07747 - S0005 W07750 - S0004 W07740 MOVSW 10KT FCST VA CLD +6HR: 12/1400Z SFC/FL170 S0003 W07740- S0006 W07738 - S0021 W07802 - S0007 W07808 -S0003 W07740 FCST VA CLD +12HR: 12/2000Z SFC/FL170 S0003W07740 - S0007 W07738 - S0024 W07801 - S0010W07807 - S0003 W07740 FCST VA CLD +18HR: 13/0200Z SFC/FL170 S0002W07740 - S0006 W07738 - S0021 W07802 - S0007W07808 - S0002 W07740 RMK: VA EMS PREVLY OBS IN STLT IMG MOVNG WSW FMSUMMIT. WX CLDS NOW OBSC THE SUMMIT AREA. ADDTNLVA EMS LKLY CONTNG BASED ON PREV ACTIVITY. NWPMDL GUIDANCE FCSTS GEN SW MOVMT THRU T+18....MONAGHANNXT ADVISORY: WILL BE ISSUED BY 20251112/1500Z