Gustnado

A gustnado is a specific type of short-lived, low-level rotating cloud that can form in a severe thunderstorm. The name is a portmanteau of "gust front tornado", as gustnadoes form due to non-tornadic cyclonic features in the downdraft from the gust (outflow) front of a strong thunderstorm, especially one which has become outflow dominated. It has little in common with tornadoes structurally in terms of vertical development, or in regard to intensity, longevity, and formative process (as classic tornadoes are associated with mesocyclones in the upflow of the storm, not the outflow).