Pyroclastic Flow followed by series of Tornados, Sinabung Volcano

The pyroclastic flow deposits red-hot material on the slope of the volcano. After a few minutes, air heated by the deposit establishes a convective regime and due to the speed of the rising air a series of small tornados (also spelled tornadoes) are formed. During daylight it is difficult to imaging how hot the deposit is. To see a pyroclastic flow deposit glowing at night from same location as present video one can view: Note: Video is played at 2x normal speed as flow