Outflow boundary

In meteorology, a squall line usually refers to the area of ​​the wedge-like penetration of a cold front in the upstream warm sector within a low pressure system. In this very rapid process, there is strong turbulence and the appearance of the eponymous wind gusts up to downbursts. Similar effects are also apparent in larger storm cells, inasmuch as use strong downdrafts in the outer regions and lead to an accumulation of cold air near the ground. Starting from the thunderstorm cell, these spreads then, often associated with typical gusts rolls as in the picture on the right below. The gust front denotes the front edge portion of the cold air. Under certain circumstances, smaller vortices can develop, which are then referred to as Gustnados. Behind the gust front usually follow intense rain front, at a great distance to the storm cells and especially when the gust front does not propagate in the direction of pull of the storm, however, these may also fail.