Semeru Volcanic Ash Advisory: ash plume to 15,000 ft (4,600 m) as of Sep 3, 23:40 UTC

Satellite image of Semeru volcano on 4 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 00:08 UTC, 04/09/26 from ADRM
VA ADVISORY
DTG: 20260904/0000Z
VAAC: DARWIN
VOLCANO: SEMERU 263300
PSN: S0806 E11255
AREA: INDONESIA
SOURCE ELEV: 3657M AMSL
ADVISORY NR: 2026/1010
INFO SOURCE: HIMAWARI-9, CVGHM
ERUPTION DETAILS: VA OBS TO FL150 AT 03/2340Z MOV NW
OBS VA DTG: 03/2340Z
OBS VA CLD: SFC/FL150 S0807 E11247 - S0743 E11259 - S0751
 E11319 - S0803 E11323 - S0817 E11321 - S0813 E11250 MOV NW
 05KT
FCST VA CLD +6 HR: 04/0540Z SFC/FL150 S0806 E11247 - S0753
 E11252 - S0745 E11307 - S0752 E11320 - S0800 E11324 - S0810
 E11324 - S0820 E11320 - S0812 E11249
FCST VA CLD +12 HR: 04/1140Z SFC/FL150 S0806 E11248 - S0743
 E11259 - S0750 E11317 - S0808 E11323 - S0813 E11252
FCST VA CLD +18 HR: 04/1740Z SFC/FL150 S0808 E11249 - S0743
 E11259 - S0749 E11319 - S0805 E11323 - S0807 E11323 - S0812
 E11254
RMK: VA PARTIALLY IDENTIFIABLE ON RECENT SATELLITE IMAGERY.
 VA HEIGHT AND FORECAST BASED ON HIMAWARI-9 SAT IMG, GROUND
 REPORTS AND MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20260904/0600Z=