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waterspouts and tornadoes, NWS / NOAA ref (edited with ProveIt) |
LEWP figure (radar), Norman, OK, ref (edited with ProveIt) |
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[[File:Illinois-LEWP.jpg|thumb|right|A LEWP in Illinois, associated with a very large derecho]]
A '''line echo wave pattern''' or '''LEWP''' (pronounced "loop" or spelled out) is the radar signature associated with a multiple-bow serial [[derecho]].<ref>[http://www.crh.noaa.gov/iwx/?n=severestorms_2011apr19 Severe Storms of April 19th-20th<!-- Bot generated title -->]</ref> It can be compared to the [[hook echo]], which indicates a strong [[supercell]], and the [[bow echo]], which usually indicates a powerful convective windstorm. Areas hit by the apices of each of the 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, [[storm train|a very long-duration]] heavy rain event can result, leading to [[flash flood]]ing. A serial derecho can be in the form of a LEWP or a single, very large [[bow echo]].<ref>{{cite web | url=http://www.srh.noaa.gov/oun/?n=diccionario_figura4 | title=Line Echo Wave Pattern (LEWP) | publisher=National Weather Service Weather Forecast Office | work=Norman, OK: Figure 4, LEWP | date=December 2, 2009 | accessdate=July 28, 2012}}</ref>
LEWP events can produce strong, damaging winds and tornadoes.<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 | accessdate=July 28, 2012}}</ref>
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