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[Stockbild] Gustnado spinning across the ground. A gustnado is a weak tornado that develops from outflow along the gust front of a thunderstorm. Debris and clouds of dust become trapped at the base of the gustnado, making it appear like a large dust devil. Gustnadoes are relatively weak and short- lived compared to tornadoes, but can still cause damage. Photographed in New Mexico, USA. (KEYSTONE/SCIENCE PHOTO LIBRARY/JIM REED) === ===