Line echo wave pattern
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A line echo wave pattern or LEWP (pronounced "loop" or spelled out) is the radar signature associated with a multiple-bow serial derecho.[1]
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."[2]
A LEWP can be compared to 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, 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.[3]
LEWP events can produce strong, damaging winds and tornadoes.[4]
References
- ^ Obergfell; Lashley; Chamberlain (April 24, 2011). Severe Storms of April 19th-20th "Severe Thunderstorms and Tornadoes of April 19-20, 2011". National Weather Service Weather Forecast Office, Northern Indiana. Retrieved July 28, 2012.
{{cite web}}: Check|url=value (help)CS1 maint: multiple names: authors list (link) - ^ "Doppler Weather Radar Overview". Echo Identification using NEXRAD: Line Echo Wave Pattern. NWAS. Retrieved July 28, 2012.
- ^ "Line Echo Wave Pattern (LEWP)". Norman, OK: Figure 4, LEWP. National Weather Service Weather Forecast Office. December 2, 2009. Retrieved July 28, 2012.
- ^ "Waterspouts and Tornadoes March 2011". National Weather Service Forecast Office (part of NOAA). 2011. Retrieved July 28, 2012.
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