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Sangay Volcanic Ash Advisory: ash plume to 21,000 ft (6,400 m) as of Sep 20, 12:20 UTC

Explosive activity continues. The Volcanic Ash Advisory Center (VAAC) Washington warned of a volcanic ash plume rising to an estimated 21000 ft (6400 m), or flight level 210, and moving at 5 kts in S direction.
Original VAAC bulletin:

FVXX25 at 13:01 UTC, 20/09/26 from KNES
VA ADVISORY
DTG: 20260920/1300Z

VAAC: WASHINGTON

VOLCANO: SANGAY 352090
PSN: S0200 W07820

AREA: ECUADOR

SOURCE ELEV: 17342 FT AMSL

ADVISORY NR: 2026/584

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

ERUPTION DETAILS: VA EMS OBS

OBS VA DTG: 20/1220Z

OBS VA CLD: SFC/FL210 S0159 W07821 - S0159 W07820
- S0211 W07819 - S0213 W07823 - S0210 W07827 -
S0200 W07824 - S0159 W07821 MOV S 5KT 

FCST VA CLD +6HR: 20/1830Z SFC/FL210 S0159 W07820
- S0201 W07819 - S0216 W07838 - S0210 W07845 -
S0159 W07820 

FCST VA CLD +12HR: 21/0030Z SFC/FL210 S0143
W07831 - S0201 W07820 - S0201 W07821 - S0151
W07841 - S0143 W07831 

FCST VA CLD +18HR: 21/0630Z SFC/FL210 S0146
W07836 - S0200 W07820 - S0201 W07820 - S0156
W07843 - S0146 W07836 

RMK: VA EMS OBSD IN WEBCAM AND STLT IMG EXTG
APPRX 15 NM SSW FM SUMMIT. SSW MVMT EXP TO SHIFT
MORE SW BY T+6 HRS AND NW BY T+12 HRS. MVMT AND
HGT BASED ON VONA, WEBCAM OBS AND NWP MDLS.
...BERTALAN

NXT ADVISORY: WILL BE ISSUED BY 20260920/1900Z
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Semeru Volcanic Ash Advisory: ash plume to 15,000 ft (4,600 m) as of Sep 20, 09:20 UTC

Satellite image of Semeru volcano on 20 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 09:40 UTC, 20/09/26 from ADRM
VA ADVISORY
DTG: 20260920/0950Z
VAAC: DARWIN
VOLCANO: SEMERU 263300
PSN: S0806 E11255
AREA: INDONESIA
SOURCE ELEV: 3657M AMSL
ADVISORY NR: 2026/1077
INFO SOURCE: HIMAWARI-9, CVGHM
ERUPTION DETAILS: VA EMISSION OBS AT 20/1920Z MOV E
OBS VA DTG: 20/0920Z
OBS VA CLD: SFC/FL150 S0804 E11252 - S0758 E11319 - S0805
 E11325 - S0813 E11320 - S0809 E11253 MOV E 15KT
FCST VA CLD +6 HR: 20/1520Z SFC/FL150 S0804 E11253 - S0755
 E11319 - S0805 E11325 - S0815 E11319 - S0809 E11253
FCST VA CLD +12 HR: 20/2120Z SFC/FL150 S0804 E11253 - S0758
 E11321 - S0806 E11326 - S0815 E11320 - S0809 E11253
FCST VA CLD +18 HR: 21/0320Z SFC/FL150 S0804 E11253 - S0758
 E11320 - S0806 E11325 - S0815 E11319 - S0809 E11253
RMK: VA IDENTIFIABLE ON CURRENT SATELLITE IMAGERY. HEIGHT
 AND MOVEMENT BASED ON SATELLITE IMAGERY, GROUND REPORTS AND
 MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20260920/1550Z=