Volcanic ash from Ruiz volcano observed at 7 010 m (23 000 feet) a.s.l., Colombia

Volcanic ash from Ruiz volcano in Colombia was observed at 7 010 m (23 000 feet) above sea level at 10:50 UTC on October 31, 2025. The advisory was issued by the Washington VAAC at 11:23 UTC.

The observed ash cloud was located between the surface and flight level 230, which corresponds to approximately 7 010 m (23 000 feet). Movement of the ash was expected toward the southwest through the next six hours according to model guidance. Ash was not visible on satellite imagery due to weather clouds in the area, but possible emissions were seen on the webcam. No Aviation Color Code was stated in this advisory.

The Smithsonian / USGS Weekly Volcanic Activity Report for Ruiz is not included in the most recent weekly summary, so no further updates on activity are available from the Global Volcanism Program at this time.

Nevado del Ruiz is a large stratovolcano in the Central Andes of Colombia. Known hazards from this volcano include ashfall, pyroclastic flows, lahars, and lava domes. Populations at risk include towns such as Armero, which was devastated by a lahar in 1985, and other communities within approximately 30 km (19 miles) of the volcano.