Volcanic ash from Klyuchevskoy volcano observed at 7 000 m (23 000 feet) a.s.l., Russia

Volcanic ash from Klyuchevskoy in Russia was observed at 7 000 m (23 000 feet) above sea level at 11:20 UTC on October 13, 2025. The advisory was issued by the Tokyo VAAC at 12:00 UTC on October 13, 2025.

According to the advisory, ash cloud was detected between the surface and flight level 230 (approximately 7 000 m or 23 000 feet). The ash cloud was moving northeast at a speed of approximately 28 km/h (17 mph). The ash cloud was forecast to reach up to flight level 250 (around 7 600 m or 25 000 feet) within 12 hours. Ash was obscured by meteorological clouds at the time of the advisory. No Aviation Color Code was stated in this advisory.

As of the latest Smithsonian / USGS Weekly Volcanic Activity Report, wind was no longer resuspending ash previously deposited on the northern flank of Klyuchevskoy. Only fumarolic emissions were observed. The Aviation Color Code was lowered to Green (the lowest level) on September 25, 2025.

Klyuchevskoy is a stratovolcano located on the Kamchatka Peninsula in Russia. It is one of the most active volcanoes in the region. The main hazards at Klyuchevskoy include ashfall, lava flows, and potential pyroclastic flows. The nearest population centers include the town of Klyuchi, situated around 30 km (19 miles) to the northeast, which may be affected by volcanic activity depending on wind and eruption dynamics.