Created Wednesday, Nov 19th 2025 17:09Z, last updated Thursday, Nov 20th 2025 14:22Z
Darwin's Volcanic Ash Advisory Centre (VAAC) have issued a red alert for aviation after Indonesian Volcano Semeru (about 56nm south of Surabaya, Indonesia) erupted several times throwing ashes up to FL590.
Indonesia's Authorities reported the eruptions started at 14:13L (07:13Z) ultimately resulting in the highest alert being issued at 17:00L (10:00Z). While the initial eruption threw ashes 2000 meters above the crater, the eruptions continued to increase.
On Nov 20th 2025 the VAAC still kept red aviation alert stating, that the eruptions are still ongoing throwing ashes up to FL150.
The Ash Advisory of Nov 20th 2025 reads:
FVAU02 ADRM 201120
VA ADVISORY
DTG: 20251120/1120Z
VAAC: DARWIN
VOLCANO: SEMERU 263300
PSN: S0806 E11255
AREA: INDONESIA
SUMMIT ELEV: 3657M
ADVISORY NR: 2025/1328
INFO SOURCE: CVGHM, HIMAWARI-8, WEBCAM, PIREP
AVIATION COLOUR CODE: RED
ERUPTION DETAILS: VA TO FL150 LAST OBS 20/0200Z
EST VA DTG: 20/1100Z
EST VA CLD: SFC/FL150 S0757 E11255 - S0803 E11312 - S0820
E11311 - S0823 E11250 - S0805 E11245 MOV SE 05KT
FCST VA CLD +6 HR: 20/1700Z SFC/FL150 S0802 E11309 - S0819
E11301 - S0815 E11242 - S0758 E11242 - S0751 E11257
FCST VA CLD +12 HR: 20/2300Z SFC/FL150 S0806 E11305 - S0824
E11257 - S0820 E11238 - S0803 E11238 - S0756 E11253
FCST VA CLD +18 HR: 21/0500Z SFC/FL150 S0803 E11254 - S0803
E11258 - S0826 E11302 - S0822 E11239
RMK: VA NOT IDENTIFIABLE ON SATELLITE IMAGERY DUE TO MET
CLOUD, HOWEVER LOCAL SOURCES SUGGEST VA EMISSIONS TO FL150
ARE ONGOING. VA HEIGHT AND FORECAST BASED ON PIREP, WEBCAM
IMAGERY AND MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20251120/1720Z=
The Ash Advisory of Nov 19th 2025 read:
FVAU02 ADRM 191600
VA ADVISORY
DTG: 20251119/1600Z
VAAC: DARWIN
VOLCANO: SEMERU 263300
PSN: S0806 E11255
AREA: INDONESIA
SUMMIT ELEV: 3657M
ADVISORY NR: 2025/1322
INFO SOURCE: CVGHM, HIMAWARI-8, WEBCAM
AVIATION COLOUR CODE: RED
ERUPTION DETAILS: VA TO FL590 LAST OBS AT 19/1240Z MOV WSW
EST VA DTG: 19/1540Z
EST VA CLD: SFC/FL590 S0725 E11307 - S0907 E11349 - S1036
E11136 - S0925 E10908 - S0726 E11016 MOV SW 25KT
FCST VA CLD +6 HR: 19/2140Z SFC/FL590 S0707 E11324 - S0932
E11422 - S1214 E11209 - S1159 E10834 - S1022 E10658 - S0708
E10917
FCST VA CLD +12 HR: 20/0340Z SFC/FL590 S0707 E11324 - S0942
E11441 - S1358 E11249 - S1356 E10758 - S1101 E10505 - S0708
E10748
FCST VA CLD +18 HR: 20/0940Z SFC/FL590 S0707 E11324 - S1410
E11450 - S1617 E11138 - S1506 E10626 - S1101 E10332 - S0712
E10631
RMK: VA NOT IDENTIFIABLE ON SATELLITE IMAGERY DUE TO MET
CLOUD. CVGHM VONA REPORTED ERUPTION AT 19/0849Z. HEIGHT
BASED ON IR TEMP AND SURABAYA 19/1200Z SOUNDING. MOVEMENT
BASED ON SATELLITE IMAGERY AND DISPERSION MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20251119/1900Z=
Forecast of expansion of ash cloud Nov 20th/Nov 21st 2025 (Graphics: VAAC):
Forecast of expansion of ash cloud Nov 19th/Nov 20th 2025 (Graphics: VAAC):
