A ground-based report indicated a volcanic ash emission from Semeru at 20 September 13:33 UTC. As of 20 September 21:30 UTC, ash was estimated to be present, moving east at 10 knots; the height was not specified.Original VAAC bulletin:FVAU02 at 21:50 UTC, 20/09/26 from ADRMVA ADVISORYDTG: 20260920/2150ZVAAC: DARWINVOLCANO: SEMERU 263300PSN: S0806 E11255AREA: INDONESIASOURCE ELEV: 3657M AMSLADVISORY NR: 2026/1079INFO SOURCE: HIMAWARI-9, CVGHMERUPTION DETAILS: VA EMISSION REP FM GND AT 20/1333ZEST VA DTG: 20/2130ZEST VA CLD: SFC/FL150 S0808 E11250 - S0801 E11251 - S0755 E11321 - S0809 E11326 - S0822 E11315 MOV E 10KTFCST VA CLD +6 HR: 21/0330Z SFC/FL150 S0808 E11252 - S0802 E11252 - S0754 E11323 - S0807 E11328 - S0819 E11320FCST VA CLD +12 HR: 21/0930Z SFC/FL150 S0809 E11253 - S0803 E11253 - S0755 E11319 - S0806 E11325 - S0817 E11318FCST VA CLD +18 HR: 21/1530Z SFC/FL150 S0805 E11251 - S0801 E11255 - S0806 E11323 - S0822 E11322 - S0828 E11306RMK: VA NOT IDENTIFIABLE ON CURRENT SATELLITE IMAGERY. HOWEVER, EMISSION IS EXPECTED TO BE ONGOING. HEIGHT AND MOVEMENT BASED ON SATELLITE IMAGERY, GROUND REPORTS AND MODEL GUIDANCE.NXT ADVISORY: NO LATER THAN 20260921/0350Z=