Semeru Volcanic Ash Advisory: ash plume to 15,000 ft (4,600 m) as of Aug 20, 10:10 UTC

Satellite image of Semeru volcano on 20 Aug 2026

Explosive activity continues. The Volcanic Ash Advisory Center (VAAC) Darwin warned of a volcanic ash plume rising to an estimated 15000 ft (4600 m), or flight level 150.
Original VAAC bulletin:

FVAU02 at 10:12 UTC, 20/08/26 from ADRM
VA ADVISORY
DTG: 20260820/1030Z
VAAC: DARWIN
VOLCANO: SEMERU 263300
PSN: S0806 E11255
AREA: INDONESIA
SOURCE ELEV: 3657M AMSL
ADVISORY NR: 2026/949
INFO SOURCE: HIMAWARI-9, CVGHM
ERUPTION DETAILS: VA TO FL150 REP AT 20/0217Z MOV NW
OBS VA DTG: 20/1010Z
OBS VA CLD: SFC/FL150 S0809 E11258 - S0810 E11252 - S0750
 E11241 - S0744 E11252 - S0748 E11304 MOV N 10KT
FCST VA CLD +6 HR: 20/1610Z SFC/FL150 S0808 E11253 - S0750
 E11241 - S0744 E11252 - S0748 E11304 - S0807 E11258
FCST VA CLD +12 HR: 20/2210Z SFC/FL150 S0809 E11252 - S0750
 E11241 - S0744 E11252 - S0748 E11304 - S0808 E11259
FCST VA CLD +18 HR: 21/0410Z SFC/FL150 S0808 E11259 - S0809
 E11252 - S0751 E11241 - S0744 E11252 - S0749 E11303
RMK: VA CURRENTLY OBSCURED BY MET CLOUD. GROUND REPORT
 CONFIRM INTERMITTENT ERUPTION CONTINUING. VA HEIGHT AND MOV
 BASED ON SATELLITE IMAGERY, GROUND REPORTS AND MODEL
 GUIDANCE.
NXT ADVISORY: NO LATER THAN 20260820/1630Z=