Volcanic ash emissions at Lewotobi volcano reach 6 700 m (22 000 feet) a.s.l., Indonesia

Volcanic ash from Lewotobi in Indonesia was observed at 6 700 m (22 000 feet) above sea level at 14:10 UTC on October 8, 2025. The advisory was issued by Darwin VAAC at 14:28 UTC.

The ash cloud was discernible in satellite imagery (Himawari-9), moving north-northwest at approximately 28 km/h (17 mph). The current Aviation Color Code is Red. Forecasts indicate that ash at lower levels (up to 3 700 m or 12 000 feet) is expected to persist and move to the northwest of the volcano over the next 18 hours, gradually dissipating. Ash height and movement are based on ground reports, satellite data, and model predictions.

According to the Smithsonian / USGS Weekly Volcanic Activity Report for September 24–30, 2025, Lewotobi Laki-laki experienced daily white-and-gray ash plumes rising as high as 2 000 m (6 600 feet) above the summit. Seismicity remained elevated, and airport operations were disrupted late September due to volcanic ash, resulting in flight cancellations. The Alert Level was lowered to 3 on September 29, 2025, with a 6 km (3.7 miles) exclusion zone in place.

Lewotobi is a twin stratovolcano system located in Flores, Indonesia. Known volcanic hazards include ashfall, pyroclastic flows, and lava emissions, posing risks to nearby settlements such as villages on Flores Island. The volcano’s eruptions have occasionally disrupted regional air traffic and require adherence to exclusion zones to mitigate risk to residents and travelers.