Volcanic ash reported at 7 600 m (25 000 feet) a.s.l. after eruption at Klyuchevskoy volcano, Russia

Volcanic ash from Klyuchevskoy volcano in Russia was reported at 7 600 m (25 000 feet) above sea level at 03:00 UTC on August 14, 2025. The advisory was issued by the Tokyo VAAC at 03:20 UTC.

According to the advisory, the eruption was observed at 03:11 UTC with ash reported extending east-southeast at flight level 250 (approximately 7 600 m or 25 000 feet). No ash cloud was detected in satellite imagery, and no Aviation Color Code was stated in this advisory.

The Smithsonian / USGS Weekly Volcanic Activity Report from early August 2025 noted ongoing eruptive activity at Klyuchevskoy, including lava flows on the west-southwest flank and multiple ash plumes observed via satellite. During that period, ash rose as high as 8 000 m (26 200 feet) and drifted significant distances from the volcano.

Klyuchevskoy is a stratovolcano located on Russia’s Kamchatka Peninsula. Known hazards include explosive eruptions, ashfall, pyroclastic flows, and lava flows. The nearest settlement, the town of Klyuchi, lies about 30 km (19 miles) northeast and may be at risk from volcanic hazards during significant eruptive events.