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 00:00 UTC on October 15, 2025. The advisory was issued by the Anchorage VAAC at 00:00 UTC.

According to the Himawari satellite data, ash from a previous eruption was identified at altitudes up to 7 000 m (23 000 feet) above sea level. The ash cloud was distributed across a wide area as described in the advisory. The current Aviation Color Code is Orange. The forecast indicated no additional ash cloud development after +6 hours.

The most recent Smithsonian / USGS Weekly Volcanic Activity Report indicates that, as of late September 2025, only fumarolic emissions were observed at Klyuchevskoy and resuspended ash was no longer detected. The Aviation Color Code had previously been lowered to Green on September 25, 2025.

Klyuchevskoy is a stratovolcano located on the Kamchatka Peninsula. It is one of the most active volcanoes in Russia, producing frequent eruptions that can generate ash plumes, pyroclastic flows, and lava flows. The nearest settlement is Klyuchi, approximately 30 km (19 miles) to the northeast, where communities may occasionally experience ashfall during significant eruptive events.