High-level eruption at Lewotobi volcano ejects ash to 10 400 m (34 400 feet) a.s.l., Indonesia

Volcanic ash from Lewotobi volcano in Indonesia was observed at 10 400 m (34 400 feet) above sea level at 16:40 UTC on October 14, 2025. The advisory was issued by the Darwin VAAC at 17:00 UTC.

According to the advisory, ash was observed from the surface up to flight level 340 (approximately 10 400 m or 34 400 feet). The ash cloud was clearly discernible on the latest RGB satellite imagery from Himawari-8. The current Aviation Color Code is Red. The ash height and forecast were reassessed using the latest satellite imagery and model guidance.

As reported by the Smithsonian / USGS Weekly Volcanic Activity Report, Lewotobi erupted frequently in late September 2025, producing white-and-gray ash plumes rising as high as 2 000 m (6 600 feet) above the summit and temporarily disrupting air travel with airport closures. The public was advised to remain at least 6 km (3.7 miles) away from the center of Laki-laki.

Lewotobi consists of two stratovolcanoes—Lewotobi Laki-laki and Lewotobi Perempuan—located in eastern Flores, Indonesia. Hazards include ashfall, pyroclastic flows, and lava flows, which can pose risks to local communities such as those in the surrounding villages and the town of Larantuka, located about 50 km (31 miles) away. The region experiences periodic eruptive activity, highlighting the importance of maintaining safety zones around the volcano.