Line echo wave pattern: Difference between revisions

Revision as of 10:54, 28 July 2012

Revision as of 00:22, 29 July 2012

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A LEWP, according to the NWAS, 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."<ref>{{cite web | url=http://www.nwas.org/committees/avnwinterwx/doppler_weather_radar_overview.htm | title=Doppler Weather Radar Overview | publisher=NWAS | work=Echo Identification using NEXRAD: Line Echo Wave Pattern | accessdate=July 28, 2012}}</ref>

A LEWP 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>