The first heavy rain process in Nanjing in spring of 2012 was analyzed by using the Nanjing Doppler radar radial velocity data. The corresponding image features of VWP products are shown during the precipitation process: When the ‘ND’area in VWP images presents a wedge shape and the formation of precipitation cloud system on the eve of middle layer is finished and decreased quickly, it means the coming of rainfall; There is a good relationship between the changes of gale base height and precipitation intensity. The precipitation intensity is obviously enhanced in half an hour when the gale base height continues to decline and maintains at a fixed height. The rain intensity decreases rapidly with the gale height shrinking rapidly. The appearance of the middle ‘ND’ area heralds the precipitation cloud system is about to collapse. The continually decline of the position of the rod indicates the end of the rain. The fracture zone and the edge of the AWR are corresponding to the heavy rain area. The divergence information calculated by the radar data reflects the dynamic characteristics of this precipitation process. The qualitative and quantitative analysis on radar radial velocity fields is helpful to capture the precursory characteristics of precipitation, and will offer indicative forecast information.
XU Fen
,
WANG Boni
,
XIA Wenmei
,
XU Qi
. Analysis on Characteristics of Doppler Radar Velocity in a Heavy Rain Process in Spring in Mid- and Lower-Reaches of Yangtze River Basin[J]. Plateau Meteorology, 2014
, 33(2)
: 548
-556
.
DOI: 10.7522/j.issn.1000-0534.2012.00195
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