Stream Structure of a Convective Line with Leading StratiformPrecipitation during Meiyu Period

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Plateau Meteorology
Plateau Meteorology ›› 2011, Vol. 30 ›› Issue (4) : 1052-1066.

Stream Structure of a Convective Line with Leading StratiformPrecipitation during Meiyu Period

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Abstract

A rear-fed leading stratiform mesoscale convective system(RFLS MCS)was observed in middle part of Hubei Province during Meiyu period of 2007. The stream structure feature of the RFLS on June 18, 2007 are analyzed using LAPS of ESRL(Earth System Research Laboratory), USA, and NCEP 1°×1° daily reanalysis data, operational observation and radar data. The horizontal reflectivity structure observed by radar is as follows: Astrong and narrow echo band is in the behind of convective line, and a sub-strong and broad echo area is frontof this convective line, there is a weak echo gouge between them. The convective cells sometime elongated and canted along the convective line.The RFLS systemon 18 June mainly consists of fourflow branches: Rear-to-front inflowat lower level, front-to-rear descending inflow and ascending flow which produce stratiform cloud anvil by tilting the rear-to-front flow in the middle and upper troposphere layer, rear-to-front flowat middle level. The RFLS system on 18 June has an overturning updraft during its early stages, and produce leading stratiform precipitation. In mature stages the vertical flow develops strongly， and the frontal stratiform echoes continue to strengthen. The line-perpendicular vertical wind shear in middle and lower troposphere layers increasing with time and the surface cold pool weakening or keeping changeless with time are the main causes for which this RFLS system updraft flow tilts frontward.

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MCS / Middle and convectiv / Meiyu

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. Stream Structure of a Convective Line with Leading StratiformPrecipitation during Meiyu Period. Plateau Meteorology. 2011, 30(4): 1052-1066

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