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Explosive activity continues. The Volcanic Ash Advisory Center (VAAC) Washington warned of a volcanic ash plume rising to an estimated 14000 ft (4300 m), or flight level 140.
Original VAAC bulletin:

FVXX21 at 05:15 UTC, 22/09/26 from KNES
VA ADVISORY
DTG: 20260922/0511Z

VAAC: WASHINGTON

VOLCANO: REVENTADOR 352010
PSN: S0004 W07739

AREA: ECUADOR

SOURCE ELEV: 11686 FT AMSL

ADVISORY NR: 2026/978

INFO SOURCE: GOES-19. VONA. WEBCAM. NWP MODELS. 

ERUPTION DETAILS: OCNL VA EMS.

OBS VA DTG: 22/0440Z

OBS VA CLD: SFC/FL140 N0006 W07754 - S0004 W07739
- S0005 W07740 - N0002 W07757 - N0006 W07754 MOV
NW 15KT 

FCST VA CLD +6HR: 22/1030Z SFC/FL140 N0005 W07756
- S0004 W07739 - S0005 W07739 - S0000 W07758 -
N0005 W07756 

FCST VA CLD +12HR: 22/1630Z SFC/FL140 N0001
W07758 - S0004 W07739 - S0005 W07739 - S0003
W07758 - N0001 W07758 

FCST VA CLD +18HR: 22/2230Z SFC/FL140 N0001
W07758 - S0004 W07739 - S0005 W07739 - S0004
W07758 - N0001 W07758 

RMK: VA CLDS OBSD MOVG WNW FM SUMMIT WITH WX CLD
CVR NOW STARTING TO INTMTLY OBSC VIEW. WEBCAM
SHOWS 1-2 VA EMS PER HR. NWP MDLS FCST VA TO MOV
W BY T+12HRS. ...HOSLEY

NXT ADVISORY: WILL BE ISSUED BY 20260922/1115Z

Satellite image of Lewotolo volcano on 21 Sep 2026

Explosive activity continues. The Volcanic Ash Advisory Center (VAAC) Darwin warned of a volcanic ash plume rising to an estimated 7000 ft (2100 m), or flight level 070, and moving at 10 kts in W direction.
Original VAAC bulletin:

FVAU04 at 22:56 UTC, 21/09/26 from ADRM
VA ADVISORY
DTG: 20260921/2300Z
VAAC: DARWIN
VOLCANO: LEWOTOLOK 264230
PSN: S0816 E12330
AREA: INDONESIA
SOURCE ELEV: 1423M AMSL
ADVISORY NR: 2026/263
INFO SOURCE: HIMAWARI-9, CVGHM
ERUPTION DETAILS: VA TO FL070 OBS AT 21/2240Z EXTD W
OBS VA DTG: 21/2240Z
OBS VA CLD: SFC/FL070 S0817 E12333 - S0827 E12307 - S0811
 E12305 - S0813 E12333 MOV W 10KT
FCST VA CLD +6 HR: 22/0440Z SFC/FL070 S0815 E12332 - S0819
 E12331 - S0816 E12306 - S0805 E12306 - S0759 E12315
FCST VA CLD +12 HR: 22/1040Z SFC/FL070 S0815 E12332 - S0819
 E12331 - S0816 E12305 - S0806 E12304 - S0800 E12311
FCST VA CLD +18 HR: 22/1640Z SFC/FL070 S0816 E12333 - S0819
 E12331 - S0818 E12305 - S0804 E12305 - S0756 E12318
RMK: CONTINUOUS VA EMISSION OBSERVED ON SATELLITE. HEIGHT
 AND FCST BASED ON SATELLITE IMAGE, GROUND REPORTS AND MODEL
 GUIDANCE.
NXT ADVISORY: NO LATER THAN 20260922/0500Z=

The Volcanic Ash Advisory Center (VAAC) Darwin issued the following bulletin.
Original VAAC bulletin:

FVAU02 at 21:49 UTC, 21/09/26 from ADRM
VA ADVISORY
DTG: 20260921/2150Z
VAAC: DARWIN
VOLCANO: SEMERU 263300
PSN: S0806 E11255
AREA: INDONESIA
SOURCE ELEV: 3657M AMSL
ADVISORY NR: 2026/1083
INFO SOURCE: HIMAWARI-9, CVGHM
ERUPTION DETAILS: VA LAST REPORTED AT 21/1930Z
EST VA DTG: 21/2130Z
EST VA CLD: SFC/FL150 S0809 E11251 - S0802 E11251 - S0751
 E11321 - S0809 E11330 - S0824 E11318 MOV E 15KT
FCST VA CLD +6 HR: 22/0330Z SFC/FL150 S0809 E11251 - S0802
 E11251 - S0751 E11321 - S0809 E11330 - S0824 E11318
FCST VA CLD +12 HR: 22/0930Z SFC/FL150 S0808 E11250 - S0801
 E11252 - S0800 E11326 - S0816 E11328 - S0826 E11317
FCST VA CLD +18 HR: 22/1530Z SFC/FL150 S0808 E11250 - S0801
 E11252 - S0800 E11326 - S0816 E11328 - S0826 E11317
RMK: VA NOT IDENTIFIABLE ON CURRENT SATELLITE IMAGERY DUE TO
 MET CLOUD. HEIGHT AND MOVEMENT BASED ON SATELLITE IMAGERY,
 GROUND REPORTS AND MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20260922/0350Z=

An eruption was reported at Sakurajima at 18:02 UTC on 21 September 2026, but no volcanic ash cloud was identifiable in satellite data as of 18:00 UTC. No further advisories are planned unless ash is detected.
Original VAAC bulletin:

FVFE01 at 18:16 UTC, 21/09/26 from RJTD
VA ADVISORY
DTG: 20260921/1816Z
VAAC: TOKYO
VOLCANO: SAKURAJIMA [AIRA CALDERA] 282080
PSN: N3136 E13039
AREA: JAPAN
SOURCE ELEV: 1117M AMSL
ADVISORY NR: 2026/218
INFO SOURCE: JMA HIMAWARI-9
ERUPTION DETAILS: ERUPTED AT 20260921/1802Z FL090 STNR
OBS VA DTG: 21/1800Z
OBS VA CLD: VA NOT IDENTIFIABLE FM SATELLITE DATA WIND FL090 330/4KT
FCST VA CLD +6 HR: NOT AVBL
FCST VA CLD +12 HR: NOT AVBL
FCST VA CLD +18 HR: NOT AVBL
RMK: WE WILL ISSUE FURTHER ADVISORY IF VA IS DETECTED IN SATELLITE 
IMAGERY.
NXT ADVISORY: NO FURTHER ADVISORIES=

Explosive activity continues. The Volcanic Ash Advisory Center (VAAC) Tokyo warned of a volcanic ash plume rising to an estimated 9000 ft (2700 m), or flight level 090, and moving at 10 kts in NE direction.
Original VAAC bulletin:

FVFE01 at 14:22 UTC, 21/09/26 from RJTD
VA ADVISORY
DTG: 20260921/1422Z
VAAC: TOKYO
VOLCANO: CHIKURACHKI 290360
PSN: N5019 E15528
AREA: KURIL ISLANDS
SOURCE ELEV: 1781M AMSL
ADVISORY NR: 2026/5
INFO SOURCE: HIMAWARI-9
ERUPTION DETAILS: VA AT 20260921/1400Z FL090 EXTD NE
OBS VA DTG: 21/1400Z
OBS VA CLD: SFC/FL090 N5021 E15524 - N5038 E15540 - N5031 E15548 - 
N5017 E15530 MOV NE 10KT
FCST VA CLD +6 HR: 21/2000Z SFC/FL090 N5111 E15759 - N5041 E15752 - 
N5014 E15525 - N5105 E15441 - N5128 E15440
FCST VA CLD +12 HR: 22/0200Z SFC/FL110 N5118 E16015 - N5043 E15927 - 

N5015 E15526 - N5336 E15420
FCST VA CLD +18 HR: 22/0800Z SFC/FL130 N5240 E16201 - N5058 E16211 - 

N5007 E15517 - N5451 E15441 - N5520 E15525
RMK: NIL
NXT ADVISORY: 20260921/1800Z=