Derecho

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A derecho (/dəˈɹeɪ.t͡ʃoʊ/ , from Spanish: derecho [deˈɾetʃo], 'straight') is a widespread, long-lived, straight-line wind storm that is associated with a fast-moving complex of severe thunderstorms referred to as a mesoscale convective system. Derechos cause hurricane-force winds, heavy rains, and flash floods. In many cases, convection-induced winds take on a bow echo (backward "C") form of squall line, often forming beneath an area of diverging upper tropospheric winds, and in a region of both rich low-level moisture and warm-air advection. Derechos move rapidly in the direction of movement of their associated storms, similar to an outflow boundary (gust front). The difference between derechos and conventional gust fronts is that derecho winds remain sustained for a longer period of time – often increasing in strength after onset – and may reach tornado- and hurricane-force. A derecho-producing convective system may remain active for many hours; occasionally even for several days. A warm...

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