ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Causality Analysis of“2007.7.18" Local Heavy Rain in Hebei Province
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Abstract:
A local heavy rainstorm in northeast and southern Hebei on July 18, 20 07 is analyzed by using conventional observation data, hourly data of automated weather station, TBB data and NCEP 6 hour reanalysis data. Conclusions are dra w n that although in the same synoptic system, the rainstorm formation mechanism i s different in different regions. It is revealed that the upperlevel and low le vel jet streams as well as the interaction between the positive feedback of the jets and rainstorm are the main reasons causing the northeast rainstorm in the m orning. The vapor is transported by lowlevel jet stream. There are roundli ke mesoα convective cloud clusters with TBB less than -70℃ in the image of th e FY-2C. The severe event in southern Hebei in the afternoon occurred under the f av orable conditions of the hightemperature, highenergy and unstable stratifica tion when instable energy was triggered and released by the co ld front and the lowpressure before the front. In the corresponding images there are quasitrans me ridian convective cloud clusters with minimum TBB less than -80℃. The streams a nd surface humidstatic energy calculated from automatic weather stations data h ave significant indication to prediction of this sort of summer strong convectio n weather.
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