Volcanic ash from Lewotobi reaches 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 20:40 UTC on October 14, 2025. The advisory was issued by the Darwin VAAC at 21:00 UTC on the same day.

The ash cloud extended from the surface up to 6 700 m (22 000 feet) and was moving toward the northwest. Satellite imagery from Himawari-8 showed the volcanic ash cloud persisting near the summit and becoming increasingly diffuse as it drifted away. The ash is expected to dissipate within 6 to 12 hours. The current Aviation Color Code is Red. Observations and model guidance informed the ash height and movement.

According to the Smithsonian/USGS Weekly Volcanic Activity Report for September 24–30, 2025, Lewotobi Laki-laki produced white-and-gray or gray ash plumes rising up to 2 000 m (6 600 feet) above the summit, drifting in multiple directions. On September 26–27, a nearby airport (60 km or 37 miles west) closed and six flights were canceled due to ash. The volcano’s Alert Level was lowered to 3 (on a scale of 1–4) on September 29, with the public advised to stay at least 6 km (3.7 miles) from the center.

Lewotobi consists of twin stratovolcanoes located in eastern Flores, Indonesia. Known hazards include ashfall, pyroclastic flows, and lahars, posing risks to nearby communities and infrastructure. The nearest city of Larantuka lies about 35 km (22 miles) northeast, with surrounding villages and agricultural areas potentially affected during eruptive episodes. Continued monitoring is essential for local populations and aviation operations in the region.