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Line echo wave pattern
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<p>A line echo wave pattern (LEWP) is a <a href="/facts/Weather_radar/S7BlhMzF">weather radar</a> formation in which a single line of thunderstorms presenting multiple <a href="/facts/Bow_echo/eGJ6qbId">bow echoes</a> forms south (or equatorward) of a <a href="/facts/Mesoscale_meteorology/E0Tdj8SK">mesoscale</a> <a href="/facts/Low-pressure_area/rphmr6qP">low-pressure area</a> with a rotating "head". LEWP often are associated with a multiple-bow serial <a href="/facts/Derecho/zK32RNAq">derecho</a> and often produce tornadoes, some of which can be strong. The existence of a LEWP on radar means that a serial <a href="/facts/Derecho/zK32RNAq">derecho</a> has developed or is likely to develop soon, much as a <a href="/facts/Hook_echo/qaJeo7XF">hook echo</a> indicates the same for a <a href="/facts/Tornado/HSGNQzHa">tornado</a>. </p>