ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 46 Issue 2 > 2020,46(2):212-222. DOI:10.7519/j.issn.10000526.2020.02.007 Prev Next
Statistical Analysis of Radar Echo Characteristics of Thunderstorm Gales in Sichuan Basin
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Abstract:
By using data of surface, upper air, lightning location and Doppler weather radar from in Sichuan Basin during 2009-2018, 34 cases of thunderstorm gale processes are counted out. And on the basis of cold air participation and 500 hPa impact system, these thunderstorm gale processes can be divided in to five types: mixed gale (Ⅰ), thunderstorm gale behind deep trough (vortex) (Ⅱ1), trough (shear) moving eastward thunderstorm gale (Ⅱ2), shear thunderstorm gale on west side of subtropical high pressure belt (Ⅱ3), 〖JP2〗and east wind disturbance thunderstorm gale (Ⅱ4). Besides, the radar echo characteristics of thunderstorm gale stations in the five kinds of processes are analyzed statistcally, including convective organization type, radar echo intensity, echo tops, vertical integrated liquid, midaltitude radial convergence, storm moving speed, echo centroid decline, high value area of wind speed at low elevation and divergence. The results show that 82% thunderstorm gale stations have high value areas of wind speed, different types of thunderstorm gale have other different warning indicators, and all these warning indicators can be advanced by more than 10 minutes. Furthermore, when there is midaltitude radial convergence, divergence, high echo intensity with strong gradient or echo type being squall line at station, we should also consider the possibility of strong wind.
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P457，P458
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