Timelapse footage of dust being blown from the ground by virga associated with a thunderstorm. The developing thunderstorm is seen in the distance. A microburst is a fast-falling column of cold air, here cooled by the evaporation of the virga, seen as grey streaks. Virga is precipitation that evaporates before reaching the ground. Microbursts are a severe hazard to aircraft, as the winds can be very strong. Filmed in Colorado, USA, on a summer afternoon.