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Explosive activity continues. The Volcanic Ash Advisory Center (VAAC) Washington warned of a volcanic ash plume rising to an estimated 4000 ft (1200 m), or flight level 040.
Original VAAC bulletin:

FVXX21 at 15:19 UTC, 20/08/26 from KNES
VA ADVISORY
DTG: 20260820/1516Z

VAAC: WASHINGTON

VOLCANO: TELICA 344040
PSN: N1236 W08650

AREA: NICARAGUA

SOURCE ELEV: 3399 FT AMSL

ADVISORY NR: 2026/044

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

ERUPTION DETAILS: LIGHT VA EMS OBSD

OBS VA DTG: 20/1440Z

OBS VA CLD: SFC/FL040 N1236 W08650 - N1235 W08649
- N1232 W08653 - N1234 W08655 - N1236 W08650 MOV
SW 30KT 

FCST VA CLD +6HR: 20/2030Z SFC/FL040 N1236 W08650
- N1235 W08650 - N1231 W08655 - N1233 W08657 -
N1236 W08650 

FCST VA CLD +12HR: 21/0230Z NO VA EXP

FCST VA CLD +18HR: 21/0830Z NO VA EXP

RMK: VA EMS LIKELY SEEN IN STLT IMG MOVNG SW FROM
SUMMIT. LGT VA EMS SEEN IN WEBCAM. NWP MDLS FCST
INDICATE CONT TO MOVE SW THRU T+6. HGT BASED ON
WEBCAM, MOVMT, NWP MDLS. ...BUTLER

NXT ADVISORY: WILL BE ISSUED BY 20260820/2115Z

Satellite image of Semeru volcano on 20 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 10:12 UTC, 20/08/26 from ADRM
VA ADVISORY
DTG: 20260820/1030Z
VAAC: DARWIN
VOLCANO: SEMERU 263300
PSN: S0806 E11255
AREA: INDONESIA
SOURCE ELEV: 3657M AMSL
ADVISORY NR: 2026/949
INFO SOURCE: HIMAWARI-9, CVGHM
ERUPTION DETAILS: VA TO FL150 REP AT 20/0217Z MOV NW
OBS VA DTG: 20/1010Z
OBS VA CLD: SFC/FL150 S0809 E11258 - S0810 E11252 - S0750
 E11241 - S0744 E11252 - S0748 E11304 MOV N 10KT
FCST VA CLD +6 HR: 20/1610Z SFC/FL150 S0808 E11253 - S0750
 E11241 - S0744 E11252 - S0748 E11304 - S0807 E11258
FCST VA CLD +12 HR: 20/2210Z SFC/FL150 S0809 E11252 - S0750
 E11241 - S0744 E11252 - S0748 E11304 - S0808 E11259
FCST VA CLD +18 HR: 21/0410Z SFC/FL150 S0808 E11259 - S0809
 E11252 - S0751 E11241 - S0744 E11252 - S0749 E11303
RMK: VA CURRENTLY OBSCURED BY MET CLOUD. GROUND REPORT
 CONFIRM INTERMITTENT ERUPTION CONTINUING. VA HEIGHT AND MOV
 BASED ON SATELLITE IMAGERY, GROUND REPORTS AND MODEL
 GUIDANCE.
NXT ADVISORY: NO LATER THAN 20260820/1630Z=

Satellite image of Ibu volcano on 20 Aug 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.
Original VAAC bulletin:

FVAU03 at 08:05 UTC, 20/08/26 from ADRM
VA ADVISORY
DTG: 20260820/0810Z
VAAC: DARWIN
VOLCANO: IBU 268030
PSN: N0129 E12738
AREA: INDONESIA
SOURCE ELEV: 1325M AMSL
ADVISORY NR: 2026/942
INFO SOURCE: HIMAWARI-9, CVGHM
ERUPTION DETAILS: VA TO FL070 REP AT 20/0710Z MOV S
OBS VA DTG: 20/0750Z
OBS VA CLD: SFC/FL070 N0131 E12739 - N0116 E12754 - N0108
 E12747 - N0107 E12736 - N0130 E12735 MOV SE 10KT
FCST VA CLD +6 HR: 20/1350Z SFC/FL070 N0131 E12739 - N0118
 E12755 - N0109 E12750 - N0107 E12739 - N0130 E12735
FCST VA CLD +12 HR: 20/1950Z SFC/FL070 N0131 E12739 - N0118
 E12755 - N0109 E12750 - N0107 E12739 - N0130 E12735
FCST VA CLD +18 HR: 21/0150Z SFC/FL070 N0131 E12739 - N0118
 E12755 - N0109 E12750 - N0107 E12739 - N0130 E12735
RMK: VA CURRENTLY NOT IDENTIFIABLE ON SATELLITE IMAGERY DUE
 TO MET CLOUD, HOWEVER ASH STILL EXPECTED IN AREA. VA HEIGHT
 AND MOVEMENT BASED ON SATELLITE IMAGERY, GROUND REPORTS AND
 MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20260820/1410Z=

Satellite image of Dukono volcano on 20 Aug 2026

Explosive activity continues. The Volcanic Ash Advisory Center (VAAC) Darwin warned of a volcanic ash plume rising to an estimated 6000 ft (1800 m), or flight level 060.
Original VAAC bulletin:

FVAU01 at 04:04 UTC, 20/08/26 from ADRM
VA ADVISORY
DTG: 20260820/0400Z
VAAC: DARWIN
VOLCANO: DUKONO 268010
PSN: N0142 E12754
AREA: INDONESIA
SOURCE ELEV: 1229M AMSL
ADVISORY NR: 2026/647
INFO SOURCE: HIMAWARI-9
ERUPTION DETAILS: VA TO FL060 OBS AT 20/0340Z MOV SE
OBS VA DTG: 20/0340Z
OBS VA CLD: SFC/FL060 N0147 E12757 - N0111 E12826 - N0057
 E12806 - N0101 E12742 - N0144 E12748 MOV SE 10KT
FCST VA CLD +6 HR: 20/0940Z SFC/FL060 N0147 E12757 - N0114
 E12829 - N0058 E12814 - N0059 E12751 - N0144 E12748
FCST VA CLD +12 HR: 20/1540Z SFC/FL060 N0144 E12749 - N0147
 E12757 - N0116 E12831 - N0058 E12819 - N0058 E12757
FCST VA CLD +18 HR: 20/2140Z SFC/FL060 N0146 E12757 - N0116
 E12831 - N0058 E12819 - N0058 E12757 - N0144 E12749
RMK: VA HEIGHT AND MOVEMENT BASED ON SATELLITE IMAGERY AND
 MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20260820/1000Z=