High-level eruption at Lewotobi volcano sends ash to 13 700 m (44 500 feet) a.s.l., Indonesia

Volcanic ash from Lewotobi in Indonesia was observed at 13 700 m (44 500 feet) at 16:30 UTC on October 14, 2025. The advisory was issued by the Darwin VAAC at 16:40 UTC.

The satellite Himawari-8 confirmed volcanic ash rising from the summit, with the ash cloud detected from the surface to flight level 450, approximately 13 700 m (44 500 feet). The ash was moving northwest at about 28 km/h (17 mph). The Aviation Color Code is Red. No further forecast ash cloud heights were provided in this advisory.

According to the Smithsonian / USGS Weekly Volcanic Activity Report, Lewotobi has recently produced daily white-and-gray or gray ash plumes, rising as high as 2 000 m (6 600 feet) above the summit and dispersing in multiple directions during late September 2025. Authorities reported ongoing seismic activity and continuing deformation, with the public previously warned to stay 6 km (3.7 miles) from the volcano’s center.

Lewotobi is a twin stratovolcano located on Flores Island, Indonesia. It is known for its explosive eruptions, producing ashfall, pyroclastic flows, and lava domes. Hazards include ashfall impacting local villages and aviation routes, with larger towns such as Larantuka situated within 60 km (37 miles) of the volcano. Residents in surrounding areas are at risk from ash, lahars, and pyroclastic density currents during major eruptions.