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

Volcanic ash from Lewotobi volcano in Indonesia was observed at 6 700 m (22 000 feet) above sea level at 18:00 UTC on October 15, 2025. The advisory was issued by the Darwin VAAC at 18:20 UTC.

Ash was observed between the surface and 6 700 m (22 000 feet) and moving northwest from the summit at approximately 19 km/h (12 mph), as confirmed by Himawari-8 satellite imagery. The current Aviation Color Code is Red. The ash cloud is expected to dissipate within six hours of the observation.

According to the Smithsonian / USGS Weekly Volcanic Activity Report for the week ending September 30, 2025, Lewotobi Laki-laki produced daily white-and-gray or gray ash plumes rising as high as 2 000 m (6 600 feet) above the summit, drifting in several directions. Ash affected aviation at Fransiskus Xaverius Seda Airport, and the public was advised to remain at least 6 km (3.7 miles) from the center.

Lewotobi is a twin stratovolcano located on Flores Island, Indonesia, consisting of Lewotobi Laki-laki and Lewotobi Perempuan cones. Known volcanic hazards include ashfall, pyroclastic flows, and possible lahars. Settlements at risk include local villages and the town of Larantuka, approximately 50 km (31 miles) north-northwest of the volcano.