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

FVXX23 at 00:27 UTC, 19/09/26 from KNES
VA ADVISORY
DTG: 20260919/0025Z

VAAC: WASHINGTON

VOLCANO: PURACE 351060
PSN: N0219 W07624

AREA: COLOMBIA

SOURCE ELEV: 15256 FT AMSL

ADVISORY NR: 2026/526

INFO SOURCE: GOES-19. VONA. NWP MODELS. SERVICIO
GEOLOGICO COLOMBIANO. 

ERUPTION DETAILS: VONA RPTS VA EM.

EST VA DTG: 19/0000Z

EST VA CLD: SFC/FL170 N0229 W07640 - N0220 W07623
- N0219 W07623 - N0223 W07644 - N0229 W07640 MOV
NW 20KT 

FCST VA CLD +6HR: 19/0600Z SFC/FL170 N0226 W07644
- N0220 W07623 - N0219 W07623 - N0219 W07645 -
N0226 W07644 

FCST VA CLD +12HR: 19/1200Z SFC/FL170 N0229
W07644 - N0220 W07623 - N0219 W07623 - N0220
W07646 - N0229 W07644 

FCST VA CLD +18HR: 19/1800Z NO VA EXP

RMK: VONA RPTS VA EM 18/2359Z. VA NOT YET OBS IN
SAT WITH PARTIAL MET CLD OBSCN. OBS VA AREA ESTD
FM VONA AND NWP MDLS. FL MVMT FCST TO CHANGE
LITTLE THRU T+12 HRS. ...CLARK

NXT ADVISORY: WILL BE ISSUED BY 20260919/0630Z

An eruption was reported at Mayon at 23:09 UTC on 18 September 2026, with ash to flight level 100 extending northeast. As of 23:20 UTC, volcanic ash was not identifiable from satellite data.
Original VAAC bulletin:

FVFE01 at 23:36 UTC, 18/09/26 from RJTD
VA ADVISORY
DTG: 20260918/2336Z
VAAC: TOKYO
VOLCANO: MAYON 273030
PSN: N1315 E12341
AREA: PHILIPPINES
SOURCE ELEV: 2462M AMSL
ADVISORY NR: 2026/792
INFO SOURCE: HIMAWARI-9 PHIVOLCS
ERUPTION DETAILS: ERUPTION AT 20260918/2309Z FL100 EXTD NE REPORTED
OBS VA DTG: 18/2320Z
OBS VA CLD: VA NOT IDENTIFIABLE FM SATELLITE DATA WIND FL100 260/4KT
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=

Satellite image of Ambrym volcano on 18 Sep 2026

Explosive activity continues. The Volcanic Ash Advisory Center (VAAC) Wellington warned of a volcanic ash plume rising to an estimated 10000 ft (3000 m), or flight level 100, and moving at 15 kts in E direction.
Original VAAC bulletin:

FVPS01 at 20:11 UTC, 18/09/26 from NZKL
VA ADVISORY
DTG: 20260918/2011Z
VAAC: WELLINGTON
VOLCANO: AMBRYM 257040
PSN: S1615 E16807
AREA: VANUATU
SOURCE ELEV: 1334M AMSL
ADVISORY NR: 2026/1
INFO SOURCE: HIMAWARI-9
ERUPTION DETAILS: LOW-LEVEL ERUPTION
OBS VA DTG: 18/2011Z
OBS VA CLD: SFC/FL100 S1620 E16803 - S1608 E16805 - S1603
 E16849 - S1629 E16846 MOV E 15KT
FCST VA CLD +6 HR: 19/0211Z NOT AVBL
FCST VA CLD +12 HR: 19/0811Z NOT AVBL
FCST VA CLD +18 HR: 19/1411Z NOT AVBL
RMK: MORE INFORMATION TO FOLLOW SHORTLY
NXT ADVISORY: NO LATER THAN 20260919/0211Z=

Satellite image of Mayon volcano on 18 Sep 2026

An eruption was reported at Mayon on 18 September 2026 at 15:03 UTC, but the ash cloud height was unknown as of the latest observation at 15:20 UTC. No volcanic ash was identifiable from satellite data.
Original VAAC bulletin:

FVFE01 at 15:36 UTC, 18/09/26 from RJTD
VA ADVISORY
DTG: 20260918/1536Z
VAAC: TOKYO
VOLCANO: MAYON 273030
PSN: N1315 E12341
AREA: PHILIPPINES
SOURCE ELEV: 2462M AMSL
ADVISORY NR: 2026/790
INFO SOURCE: HIMAWARI-9 PHIVOLCS
ERUPTION DETAILS: ERUPTION AT 20260918/1503Z VA CLD UNKNOWN REPORTED
OBS VA DTG: 18/1520Z
OBS VA CLD: VA NOT IDENTIFIABLE FM SATELLITE DATA WIND FL180 300/1KT
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=