Semeru Volcanic Ash Advisory: ash plume to 15,000 ft (4,600 m) as of Aug 18, 04:30 UTC

Satellite image of Semeru volcano on 18 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 04:50 UTC, 18/08/26 from ADRM
VA ADVISORY
DTG: 20260818/0450Z
VAAC: DARWIN
VOLCANO: SEMERU 263300
PSN: S0806 E11255
AREA: INDONESIA
SOURCE ELEV: 3657M AMSL
ADVISORY NR: 2026/940
INFO SOURCE: HIMAWARI-9, CVGHM, WEBCAM
ERUPTION DETAILS: VA TO FL150 OBS AT 18/0430Z MOV SE
OBS VA DTG: 18/0430Z
OBS VA CLD: SFC/FL150 S0804 E11251 - S0753 E11314 - S0808
 E11320 - S0823 E11311 - S0811 E11251 MOV E 10KT
FCST VA CLD +6 HR: 18/1030Z SFC/FL150 S0810 E11252 - S0804
 E11250 - S0750 E11311 - S0758 E11318 - S0810 E11318
FCST VA CLD +12 HR: 18/1630Z SFC/FL150 S0806 E11250 - S0747
 E11305 - S0750 E11316 - S0801 E11318 - S0811 E11254
FCST VA CLD +18 HR: 18/2230Z SFC/FL150 S0809 E11251 - S0744
 E11257 - S0746 E11310 - S0755 E11317 - S0810 E11256
RMK: VA IDENTIFIABLE ON RECENT SATELLITE IMAGERY MOV SE.
 INTERMITTENT VA EMISSIONS ARE ONGOING. VA HEIGHT AND MOV
 BASED ON SATELLITE IMAGERY, GROUND REPORTS AND MODEL
 GUIDANCE.
NXT ADVISORY: NO LATER THAN 20260818/1050Z=