Analysis of the Echoes of an X-band Phased-array Radar for a Severe Convective Weather
Using the data of an X-band dual polarization phased-array radar in Dongguan,this paper analyzed the characteristics of the echoes for a local weather of hails and short-range intense rain in the city taking place on July 28,2021.The results are shown as follows.The severe convective weather happened a-gainst the background of a wide trough formed as Typhoon In-fa made landfall and headed north and a north-erly converging with a westerly at the low level.Prior to the weather,energy accumulated due to descending air currents at the periphery of the typhoon and a mid-level cold advection flow and a low-level southwesterly strengthened over the estuary of the Pearl River,making the environment favorable for the genesis and main-tenance of the storm of interest.During this process,a convective storm developed,and then weakened and dissipated in the southeast of the city,resulting in a local short-range intense rain of 125.5 mm at the town of Tangxia.While low-level KDP indicated short-range intense rainfall,ZDR was a factor in the rain rate for the stage of intense rain.Generated in the north of Dongguan,another convective storm produced local hails and short-range gales at the Beaufort scale of eight.Different from the storm in the southeast that brought in-tense rain,this hailing storm possessed strong ZDR columns and observable three-body scattering spikes on PPI prior to the precipitation of hails.The storm trend product of VIL experienced two significant descents,which acted as a good indicator for diverging winds and falling hails as a result of decreased cell mass cores.Phase-state recognition products were also successful in helping determine if hails touched the ground.
万方数据
维普
