Line echo wave pattern A line echo wave pattern is a weather radar formation in which a single line of thunderstorms presenting multiple bow echoes forms south of a mesoscale low-pressure area with a rotating "head". LEWP often are associated with a multiple-bow serial derecho and often produce tornadoes , some of which can be strong. The existence of a LEWP on radar means that a serial derecho has developed or is likely to develop soon, much as a hook echo indicates the same for a tornado .Formation A LEWP, according to the NWS, is defined as "a squall line that has developed into a wave-like pattern due to acceleration at one end of the line and deceleration along the portion immediately adjacent ." A LEWP is an extension of the concept of the bow echo , which usually indicates a powerful convective windstorm. Areas hit by the apices of bows often see the worst weather, with the highest winds and very heavy rain . However, if the sides of the bows reach enough of an orientation parallel to the derecho's movement , a very long-duration heavy rain event can result, leading to flash flooding . A serial derecho can be in the form of a LEWP or a single, very large bow echo. In theory, a LEWPs formation is dependent on varying environmental conditions in different regions of the respective LEWP. In many LEWPs, outflow induced winds behind the leading edge tend to influence this edge , appearing as a bulge in reflectivity on radar. Another conditional scenario is varying amounts of shear parallel and along the line.
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