A large-scale strong convection which is occurred in Jiangsu Province on August 6 2015 is diagnosed and analyzed from various angles using reanalysis data, surface observation data and the new generation radar data. The main conclusions are the followings: the ground squall line is the direct impact system of this strong convection. The upper air is dry and cold and the low level is warm and humid. During this convection, the wind direction is suddenly changed, wind speed is shot up, the pressure is upwelling, the temperature is dropped sharply, and the relative humidity rises sharply. The atmosphere energy is accumulated in the ground, there is an energy front area between the middle level and lower level, the strong vertical rising speed, the low-level convergence and high-level divergence of water vapor flux are the favorable factors for heavy precipitation. The radar echo shows that there is a clear gust front on the right side of the thunderstorm in Liuhe area, simultaneously, and there is a distinct weak narrow-band in the left front of the echo, corresponding to the outflow boundary of the rear side of the thunderstorm. In addition, the center of the radar echo is observed decline rapidly in the vertical direction. The above characteristics have a good indication of the prediction of severe winds.
In order to observe and study the severe convective weather processes such as tornadoes, a high-spatiotemporal resolution X-band all-solid-state dual-polarization Doppler weather radar tornado observation network is being established in the North Jiangsu Plain, which is a easy occur area of tornadoes in china. In this paper, the networking strategy of tornado radar observation network in Northern Jiangsu is introduced, and the relevant issues are discussed in combination with the 2018 wind and severe convection cooperative observation experiment in Northern Jiangsu. It shows:(1) The easy occur areas of tornadoes in Northern Jiangsu such as Yancheng, Funing, Dafeng, Xinghua, Baoying and Gaoyou are in the low-level blind coverage area or long-distance coverage area of S-band operational radar. In terms of tornado scale and specific (Tornado Debris Specific (TDS)), it is difficult for S-band operational radar to meet the fast and detailed detection of tornado with low spatiotemporal resolution and without polarization detection capability.(2)The X-band all-solid-state dual-polarization Doppler weather radar network with temporal resolution of 60s (16-layer 60 degree sector scan) or 120s (16-layer volume scan), spatial resolution of 30m, beam width of 0.5 degree, maximum non-ambiguity velocity of 96m/s (30km), flexibility antenna, multiple scanning modes and dual polarization detection capability can be used as an effective supplement to S-band operational radar network. Compared with the S-band operational radar, its detailed detection ability (echo intensity) is mainly reflected in the integrity and the detailed structure of convective cell, and the integrity is mainly reflected in the low-level blinding ability and the detection ability of small particles; The detailed structure is mainly reflected in the clear echo structure, clear contour and good continuity. The rain attenuation sensitivity can be reduced by controlling the radar spacing and making some attenuation correction.(3)The X-band all-solid-state dual-polarization Doppler weather radar is fixed in Yandu, Funing, Baoying, Dafeng and Xinghua areas in Northern Jiangsu, with 50-60 km distance of station, which forms a high spatiotemporal resolution radar network of approximate trapezoid structure with approximate equilateral triangle as the basic element to monitor severe weather processes such as tornadoes. All that work is relatively reasonable. However, Gaoyou is located in the upstream of the weather system and the easy occur area of tornadoes. Subsequently, a weather radar "shouldering the monitoring and early warning tasks of severe weather in the tornado radar network" can be expanded in Gaoyou.
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