Analysis on Radar Satellite and Lightning Characteristics of a Severe Convective Process in Hubei in the Spring of 2022
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Abstract:
Using satellite data, radar data, lightning data and NCEP reanalysis data, taking a large-scale strong convective process in Hubei Province on March 16, 2022 as an example, the observation characteristics of convective systems at two different positions during the movement of the southwest vortex ars analyzed. The results show that the eastward movement of the southwest vortex in front of the trough was the main influence system of the strong convection. The wind and hail weather in eastern Hubei mainly occurred at the top of the low vortex and the warm shear line, while the cold shear line in the southern part of the low vortex induced the southern convection. In this case, the TBB gradually dropped below 220 K in the early stage of convective development, and the maximum local TBB variability could reach -30 ℃ in the next one. Most of the lightning strikes were close to the right side of the TBB≤220 K cumulus and the centre and edge of the large TBB variability area. The lightning on the right side of the convective system was a good indicator of the development and movement of the convective system. The area of cumulus clouds with TBB≤210 K reached the maximum in the mature stage, and the TBB variability decreased in the next hour. The dense lightning strikes were distributed in the middle of the cumulus cloud cluster and moved with the low TBB area. The vertical profile of the radar reflectivity factor presented a right-tilt structure, and the righttilt feature was more evident in the convective development stage. The lightning was located on the right front side of the convective system and was consistent with the strong echo of ≥45 dBz; the combined reflectivity area of ≥45 dBz and ≥50 dBz, and the echo top areas of ≥10 km and≥12 km were positively correlated with the evolution of convective systems. The positive and negative ground lightning peaks appeared 0 to 18 minutes earlier than wind and hail. The first peak value of negative ground lightning significantly impacted wind and hail, and the advance amount could reach 18 minutes.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.