Ash plume from Lewotobi volcano reaches 5 500 m (18 000 feet) a.s.l., Indonesia

Volcanic ash from Lewotobi volcano in Indonesia was observed at 5 500 m (18 000 feet) above sea level at 03:30 UTC on October 15, 2025. The advisory was issued by the Darwin VAAC at 04:00 UTC.

According to the advisory, continuous volcanic ash to 4 600 m (15 000 feet) extended to the north-northwest from the summit. Ash was also observed near the summit up to 6 700 m (22 000 feet) in light winds. The ash cloud was moving north-northwest at 9 km/h (5.6 mph). The analysis was based on Himawari-8 satellite imagery, model guidance, and ground reports. The current Aviation Color Code is Red.

The Smithsonian / USGS Weekly Volcanic Activity Report for September 24–30, 2025, notes that Lewotobi Laki-laki emitted variable white and gray ash plumes rising up to 2 000 m (6 600 feet) above the summit, affecting local air traffic and resulting in an airport closure. Seismic activity was dominated by low-frequency earthquakes, and deformation was ongoing. The Alert Level was recently lowered to 3, with a restriction zone of 6 km (3.7 miles) from the summit.

Lewotobi is a twin stratovolcano complex located in Flores, Indonesia. The main hazards include ashfall, pyroclastic flows, and lava domes. Nearby settlements such as the town of Larantuka, about 40 km (25 miles) away, may be affected by ashfall depending on wind direction. The volcano poses risks to both aviation and local communities due to its explosive eruption style and proximity to inhabited areas.