ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Analysis on Environmental Conditions and Doppler Radar Data for Tornado Events in Front of Typhoon Fenghuang（0808）
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Abstract:
Tornadoes occurred in front of typhoon in Jiangsu Province on 29 to 30 July, 200 8. A detailed analysis of the environmental conditions, structure and evolution of tornado is made based on the Doppler weather radar data, routine upperair a nd surface observations, and intensive automatic weather station observations. T he main results are as follows: The tornadoes occurred in the area with high val ue of low level vertical wind shear. The low lifting condensation level, unstabl e stratification and deeper positive vorticity all these factors supplied the th ermodynamic and dynamical conditions for the occurrence of tornadoes. The tornad o occurred at Dongtai is associated with a mesoscale squallline, whereas the t ornadoes occurred at Gaoyou and Baoying are associated with multicell convective storm. The rear part of the storm cell ha s a large reflectivity gradient, which is often accompanied by the weak echo str ucture and backflank notch in the low level. Not all the tornadoes occurred i n the stormcell with mesocyclone and tornado vortex signature. Some tornadoe s happened in the stormcell with weak cyclone vortex in the low level. When th e altitude of strong echo center and the vertical cumulative liquid water falls suddenly and cyclone vortex develops rapidly, the tornado will occur very soon. In operational work, we shouldn’t alert the occurrence of tornadoes only de pending on the mesocyclone signature and tornado vortex signature. We should a lso combine the other products, for example, reflectivity, average radial vel ocity, storm structure, etc. It is possible to greatly enhance weather radar’s capability to detect the tornadoes.
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