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A '''line echo wave pattern''' ('''LEWP''') is a [[weather radar]] formation in which a single line of thunderstorms presenting multiple [[bow echo]]es forms south (or equatorward) of a [[Mesoscale meteorology|mesoscale]] [[low-pressure area]] with a rotating "head".<ref>{{cite book |last = Glickman |first = Todd S. (ed.) |author-link=Todd Glickman |title = Glossary of Meteorology |publisher = American Meteorological Society |edition = 2nd |year = 2000 |url = http://glossary.ametsoc.org/wiki/Line_echo_wave_pattern |isbn = 978-1-878220-34-9 }}</ref> LEWP often are associated with a multiple-bow serial [[derecho]]<ref>{{cite web | url=https://www.weather.gov/iwx/20110419_lewp Severe Storms of April 19th-20th | title=Severe Thunderstorms and Tornadoes of April 19-20, 2011 | publisher=National Weather Service Weather Forecast Office, Northern Indiana | date=April 24, 2011 | access-date=February 9, 2020 |author1=Obergfell |author2=Lashley |author3=Chamberlain }}</ref> and often produce tornadoes, some of which can be strong.<ref>{{cite web | url=http://www.wrh.noaa.gov/mtr/stormSummary/TorWx_3_18-23_2011/torwx_3_18-23.php | title=Waterspouts and Tornadoes March 2011 | publisher=National Weather Service Forecast Office (part of NOAA) | date=2011 | access-date=July 28, 2012}}</ref> 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 ==
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