ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Comparing Polarimetric Radar Signatures of Significant Tornadic and Non-tornadic Supercells
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Abstract:
Significant tornadoes associated with supercells can cause severe disasters. Issuing tornado warnings is challenging. Therefore, it is essential to study the detailed echo structure of supercells. Based on the observations of S-band Doppler polarimetric radar, 9 significant tornadic supercells are compared with 9 non-tornaic supercells. The results indicate significant differences between them. The detail results are as follows. 1）In tornadic supercells, the differential reflectivity ZDR arc extends toward the hook echo, and the area of hail in the mid-to-low levels is smaller than in non-tornadic supercells. 2）The average separation distance between the specific differential phase KDP foot centroid and ZDR arc centroid in the low-level is larger in tornadic supercells than in non-tornadic supercells. 3）In tornadic supercells,the low-level mesocyclone intensifies significantly. Additionally, before the tornado occurs, the mid-level mesocyclone core remains at relatively low heights, averaging 4.2 km at 24 minutes prior and 3.1 km at 6 minutes prior to the tornado formation. The aforementioned differences require further confirmation through more cases to provide additional evidence for in-depth research on the relationship between the echo structure characteristics of supercells and the mechanisms of tornado formation.
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强降水超级单体风暴结构及形成机制研究(Study on the structure and formation mechanism of high-precipitation supercell in China)
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