A small whirlwind, known as a dust devil, surprised visitors in London's Greenwich Park on Sunday, with footage showing it swirling around people. The phenomenon caused individuals to get up from their picnics and react with alarm as the whirlwind moved through the area.
Dust devils typically form on warm, sunny days and become visible when they pick up and swirl dust or other debris. The event occurred amidst weather conditions conducive to their formation.