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On April 22, 2015, Calbuco volcano in southern Chile began erupting for the first time since 1972. An ash cloud rose at least 15 kilometers (50,000 feet) above the volcano, menacing the nearby communities of Puerto Montt (Chile) and San Carlos de Bariloche (Argentina). The eruption led the Chilean Emergency Management Agency and the Chilean Geology and Mining Service (SERNAGEOMIN) to order evacuations within a 20-kilometer (12 mile) radius around the volcano. About 1,500 to 2,000 people were evacuated; no casualties have been reported so far. The volcanic mountain was quiet until tremors began late in the afternoon on April 22. An explosive pyroclastic eruption started at 6:04 p.m. local time (2104 Universal Time) and vigorously spewed ash and pumice for at least 90 minutes. Lava flows were observed from the main vent. A second high-energy pulse of ash occurred around 1 a.m. on April 23, according to SERNAGEOMIN. At 11:20 a.m. local time (1420 Universal Time) on April 23, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite acquired a natural-color image of the extensive ash plume (top). Four hours later, at 3:35 p.m. local time (1835 Universal Time), the MODIS instrument on NASA's Aqua satellite acquired a second view (bottom) as the tan plume continued moving north and east. Satellite instruments also acquired unusual nighttime views of the eruption (below) in the early morning hours of April 23. The joint NOAA/NASA Suomi NPP satellite observed atmospheric waves above Calbuco and its plume. The image is by Joshua Stevens, NASA Earth Observatory, and Jeff Schmaltz, LANCE/EOSDIS Rapid Response at NASA Goddard. Caption by Mike Carlowicz. Special thanks to William Straka of the University of Wisconsin's Cooperative Institute for Meteorological Satellite Studies (CIMSS). *** Please Use Credit from Credit Field ***