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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=

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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).

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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.