A widespread convectively induced straight-line windstorm.
The term derecho derives from a Spanish word that can be interpreted as "straight ahead" or "direct" and was chosen to discriminate between wind damage caused by tornadoes
, which have rotating flow, from straight-line winds. More specific guidelines for identifying derechos are suggested in the references below. These guidelines are subject to change with improvements in observing systems, particularly with severe wind measuring and reporting capabilities.
Corfidi, S. F., M. C. Coniglio, A. E. Cohen, and C. M. Meade, 2016: A proposed revision to the definition of “derecho.” Bull. Amer. Meteror. Soc., 97, 935–949, doi:10.1175/BAMS-D-14-00254.1.
Johns, R. H., and W. D. Hirt, 1987: Derechos: Widespread convectively induced windstorms. Wea. Forecasting, 2, 32–49, doi:10.1175/1520-0434(1987)002<0032:DWCIW>2.0.CO;2.
Term updated 18 March 2019.