Analysis of Heavy Rain on June 9th 2002 in Hanzhongof Shaanxi Province

Based on the analysis of the features and evolution of the circulation background,and physical quantities of the heavy rain in Hanzhong during 8-9 June 2002, it is shown that thermal and water vapor conditions in Hanzhong have changed 24 hours before raining, strong positive vorticity at the middle and low levels and strong negative vorticity at the high level overlapped in a narrow region is also a inducement of the heavy rain.

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