Semeru Volcano Volcanic Ash Advisory: VA TO FL150 OBS AT 04/1030Z MOV WNW OBS VA DTG: 04/1030Z to 15000 ft (4600 m)

Satellite image of Semeru volcano on 4 May 2026

Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 .
The full report is as follows:

FVAU02 at 10:48 UTC, 04/05/26 from ADRM
VA ADVISORY
DTG: 20260504/1050Z
VAAC: DARWIN
VOLCANO: SEMERU 263300
PSN: S0806 E11255
AREA: INDONESIA
SOURCE ELEV: 3657M AMSL
ADVISORY NR: 2026/507
INFO SOURCE: CVGHM, HIMAWARI-9, WEBCAM
ERUPTION DETAILS: VA TO FL150 OBS AT 04/1030Z MOV WNW
OBS VA DTG: 04/1030Z
OBS VA CLD: SFC/FL150 S0802 E11259 – S0812 E11258 – S0808
E11228 – S0752 E11233 MOV W 10KT
FCST VA CLD +6 HR: 04/1630Z SFC/FL150 S0802 E11259 – S0812
E11258 – S0818 E11204 – S0744 E11208
FCST VA CLD +12 HR: 04/2230Z SFC/FL150 S0802 E11259 – S0812
E11258 – S0817 E11204 – S0740 E11210
FCST VA CLD +18 HR: 05/0430Z SFC/FL150 S0802 E11259 – S0812
E11258 – S0818 E11203 – S0732 E11214
RMK: DISCRTE VA EMISSIONS IDENTIFIABLE ON SATELLITE AND
WEBCAM IMAGERY. HEIGHT AND MOVEMENT BASED ON SATELLITE
IMAGERY, GROUND REPORTS AND MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20260504/1650Z=

Ambae volcano (Vanuatu): intra-caldera lava flow continues

The lava flow eruption within the Manaro Voui caldera persists (image: Sentinel-2)

The effusive eruption at the volcano continues.

The Sentinel-2 false colour imagery from 2 May confirms the advancing lava flow eruption within the Manaro Voui caldera (also called Lombenben Voui).

Mayon volcano (Philippines): massive pyrocastic flow from summit

The strong pyroclastic flow from the summit crater created abundant phoenix clouds (image: @volcaholic1x.com)

A strong pyroclastic flow occurred from the summit crater on 2 May.

The most likely reason for this flow was the sudden accumulation and destabilization of the upper summit crater area, which in turn developed into a very dangerous pyroclastic flow. The block-and-ash flow generated ash-rich plumes separating from the pyroclastic density current known as phoenix clouds.

Light-to-moderate ash fall has been reported in several villages within a close radius of the volcano.

Dukono Volcano Volcanic Ash Advisory: VA TO FL080 REPORTED AT 03/2124Z MOV ENE EST VA DTG: 03/2150Z to 8000 ft (2400 m)

Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 8000 ft (2400 m) altitude or flight level 080 .
The full report is as follows:

FVAU03 at 22:08 UTC, 03/05/26 from ADRM
VA ADVISORY
DTG: 20260503/2210Z
VAAC: DARWIN
VOLCANO: DUKONO 268010
PSN: N0142 E12754
AREA: INDONESIA
SOURCE ELEV: 1229M AMSL
ADVISORY NR: 2026/197
INFO SOURCE: HIMAWARI-9 CVGHM
ERUPTION DETAILS: VA TO FL080 REPORTED AT 03/2124Z MOV ENE
EST VA DTG: 03/2150Z
EST VA CLD: SFC/FL080 N0147 E12750 – N0200 E12825 – N0144
E12838 – N0125 E12827 – N0133 E12752 MOV E 05KT
FCST VA CLD +6 HR: 04/0350Z SFC/FL080 N0140 E12751 – N0146
E12751 – N0155 E12829 – N0142 E12837 – N0129 E12827
FCST VA CLD +12 HR: 04/0950Z SFC/FL080 N0139 E12750 – N0146
E12751 – N0155 E12828 – N0136 E12836 – N0120 E12819
FCST VA CLD +18 HR: 04/1550Z SFC/FL080 N0141 E12750 – N0147
E12752 – N0144 E12834 – N0116 E12821
RMK: VA NOT IDENTIFIABLE ON SATELLITE IMAGERY DUE TO MET
CLOUD. GROUND REPORT INDICATES VA EMISSIONS ARE ONGOING.
HEIGHT AND MOVEMENT BASED ON SATELLITE IMAGERY, GROUND
REPORT AND MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20260504/0410Z=

Ibu Volcano Volcanic Ash Advisory: VA TO FL070 REPORTED AT 03/0925Z MOV ENE EST VA DTG: 03/1710Z to 7000 ft (2100 m)

Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 .
The full report is as follows:

FVAU01 at 17:28 UTC, 03/05/26 from ADRM
VA ADVISORY
DTG: 20260503/1730Z
VAAC: DARWIN
VOLCANO: IBU 268030
PSN: N0129 E12738
AREA: INDONESIA
SOURCE ELEV: 1325M AMSL
ADVISORY NR: 2026/500
INFO SOURCE: HIMAWARI-9, CVGHM
ERUPTION DETAILS: VA TO FL070 REPORTED AT 03/0925Z MOV ENE
EST VA DTG: 03/1710Z
EST VA CLD: SFC/FL070 N0123 E12735 – N0133 E12733 – N0155
E12753 – N0137 E12814 – N0114 E12803 MOV E 05KT
FCST VA CLD +6 HR: 03/2310Z SFC/FL070 N0123 E12735 – N0133
E12733 – N0150 E12759 – N0139 E12814 – N0123 E12806
FCST VA CLD +12 HR: 04/0510Z SFC/FL070 N0123 E12735 – N0133
E12733 – N0148 E12801 – N0133 E12814 – N0118 E12804
FCST VA CLD +18 HR: 04/1110Z SFC/FL070 N0123 E12735 – N0133
E12733 – N0144 E12803 – N0128 E12815 – N0113 E12801
RMK: VA NOT IDENTIFIABLE ON SATELLITE IMAGERY DUE TO MET
CLOUD. GROUND REPORTS INDICATE DISCRETE ERUPTIONS ARE
ONGOING. HEIGHT AND MOVEMENT BASED ON GROUND REPORTS AND
MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20260503/2330Z=