Volcanic ash from Klyuchevskoy volcano observed at 8 200 m (26 900 feet) a.s.l., Russia

Volcanic ash from Klyuchevskoy in Russia was observed at 8 200 m (26 900 feet) above sea level at 20:30 UTC on October 14, 2025. The advisory was issued by VAAC Tokyo at 21:07 UTC.

The ash cloud was identified between the surface and flight level 270, corresponding to 8 200 m (26 900 feet). Satellite data from Himawari-8 and a ground report confirmed the ash height. The ash cloud was moving to the northeast at approximately 19 km/h (12 mph). Forecasts predicted that the ash cloud would remain at similar altitudes and move further northeast over the next several hours. No Aviation Color Code was stated in this advisory.

According to the Global Volcanism Program, recent reports for Klyuchevskoy indicate that wind was no longer resuspending ash previously deposited on the northern flank as of late September 2025, with only fumarolic emissions observed. The Aviation Color Code had been lowered to Green on September 25, 2025.

Klyuchevskoy is a large stratovolcano situated on the Kamchatka Peninsula in eastern Russia. It is the highest volcano in Eurasia, reaching 4 754 m (15 597 feet). Hazards from this volcano include ashfall, lava flows, pyroclastic flows, and lahars. Although the area around the volcano is sparsely populated, the nearby town of Klyuchi, located roughly 30 km (19 miles) to the northeast, may be affected by eruptive activity, particularly ashfall events.