Sunda Strait · 6 September 2026
Anak Krakatau has been erupting since Friday night. Two ash clouds are in the air: a 6 km plume toward Java, and a 15 km plume toward Sumatra. There is no tsunami warning. Stay 3 km from the crater.
No tsunami warning
Ash drift
Particles follow BMKG and VAAC Darwin plume directions. Switch layers to see how wind changes with height — that is why Jakarta and Lampung can both be under ash at the same time.
Surface wind
22 km/hEast onto the Banten coast: Anyer, Carita, Serang, Cilegon, Tangerang.
6 km · Java plume
45 km/hNortheast to south: Jakarta, Banten, West Java, and nearby waters.
15 km · Sumatra plume
74 km/hSouthwest to northwest: Banten, Lampung, Bengkulu, south Sunda Strait, Indian Ocean.
Basemap: Esri World Topo / Imagery. Ash drift: BMKG and VAAC Darwin.
Air ratings
Ashfall and the air-quality index are not the same thing. Lampung can have falling ash while its AQI looks moderate. Jakarta can look unhealthy on ozone even when ash is only light. Read both.
Modeled US AQI · CAMS / Open-Meteo
Protect
Pick a city. We combine the official plume direction with distance, ash reports, and today’s air rating — then tell you what to do in the next few hours.
You are in
You are in the current ash path.
158 km from the crater. Ash leaving the crater toward you travels east.
BMKG: airborne ash over parts of the capital. BPBD calls exposure light for now. CFD crowds were asked to mask.
Do this now
N95 / KN95 that seals the nose and mouth. Cloth and surgical masks leak ash.
Stay inside. Skip outdoor exercise, CFD, and errands that can wait. Close windows.
Ash scratches eyes. Wear glasses, not contacts. Rinse with clean water, never rub.
Cover wells, buckets, and open tanks. Let ash settle; do not drink cloudy water.
Ash makes roads slick and cuts visibility. Lights on, more distance, no sudden braking.
Children, older adults, pregnancy, asthma: stay in with a mask ready if you must go out.
Briefing
Fri 4 Sep, 23:23 WIB
Eruption begins
Continuous activity, lava fountains, booming heard up to 700 km. BMKG issues the first SIGMET for aviation.
Sat 5 Sep
Ash on Banten and Lampung
A six-hour pulse. Light ash on the Banten coast. Schools cancel, fishermen stay ashore, eye irritation reported. Status remains Level III Siaga (in place since 2 July). No tsunami risk, BNPB says.
Sun 6 Sep, 01:30–03:53
Ash at Soekarno-Hatta
Paper tests at the airport confirm volcanic ash. Soetta closes. A 30-second eruption at 03:53 with lava flares on PVMBG cameras.
Sun 6 Sep, 04:00–08:00
Two plumes on satellite
Himawari-9 + VAAC Darwin: 20,000 ft drifting NE–S over Jakarta, Banten, West Java; 50,000 ft drifting SW–NW over Lampung, Bengkulu, and the Indian Ocean.
Sun 6 Sep, morning
Four airports, 15 districts
Soetta, Halim, Radin Inten II, and Budiarto close on staggered NOTAMs. BNPB counts 15 kecamatan in South Lampung, Pandeglang, and Tanggamus. No casualties. Health ministry: stay in, wear a mask.
Soekarno-Hatta (CGK)
Closed through early afternoon
Tangerang / Jakarta
Paper-test positive overnight. First halt 01:30, extended toward 13:30 WIB. 209–301 movements, ~22,800 passengers. Singapore hardest-hit internationally; domestic hits include Makassar, Bali, Surabaya, Lampung.
Halim Perdanakusuma (HLP)
Morning closure, later extended
East Jakarta
NOTAM from ~07:20. Reports later stretched the halt toward 14:00 WIB. Check the airline, not the departure board.
Radin Inten II (TKG)
Closed Sunday morning
Lampung
Closed ~04:18–10:00 WIB while the high plume sat over southern Sumatra.
Budiarto (WICC)
Training-field halt
Curug, Tangerang
Closed ~06:48–09:30 WIB. Knock-on delays also reported at Yogyakarta, Minangkabau, and Supadio as rotations broke.