Semeru Volcanic Ash Advisory: ash plume to 15,000 ft (4,600 m) as of Sep 20, 09:20 UTC

Satellite image of Semeru volcano on 20 Sep 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 09:40 UTC, 20/09/26 from ADRM
VA ADVISORY
DTG: 20260920/0950Z
VAAC: DARWIN
VOLCANO: SEMERU 263300
PSN: S0806 E11255
AREA: INDONESIA
SOURCE ELEV: 3657M AMSL
ADVISORY NR: 2026/1077
INFO SOURCE: HIMAWARI-9, CVGHM
ERUPTION DETAILS: VA EMISSION OBS AT 20/1920Z MOV E
OBS VA DTG: 20/0920Z
OBS VA CLD: SFC/FL150 S0804 E11252 - S0758 E11319 - S0805
 E11325 - S0813 E11320 - S0809 E11253 MOV E 15KT
FCST VA CLD +6 HR: 20/1520Z SFC/FL150 S0804 E11253 - S0755
 E11319 - S0805 E11325 - S0815 E11319 - S0809 E11253
FCST VA CLD +12 HR: 20/2120Z SFC/FL150 S0804 E11253 - S0758
 E11321 - S0806 E11326 - S0815 E11320 - S0809 E11253
FCST VA CLD +18 HR: 21/0320Z SFC/FL150 S0804 E11253 - S0758
 E11320 - S0806 E11325 - S0815 E11319 - S0809 E11253
RMK: VA IDENTIFIABLE ON CURRENT SATELLITE IMAGERY. HEIGHT
 AND MOVEMENT BASED ON SATELLITE IMAGERY, GROUND REPORTS AND
 MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20260920/1550Z=