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DIAGNOSTIC ANALYSIS OF MOIST POTENTIAL VORTICITY FOR HEAVY RAIN IN MIDDLE YUNNAN

Duan Xu, Ying Li

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Abstract

By using the concept of moist potential vorticity, the characteristics of moist potential vorticity are analyzed in the process of the six heavy rain days over the middle Yunnan in June 1998. The results show that the very stiff moist isentropes and strong warm and moist air located its south can lead to the development of moist slantwise vorticity and the heavy rain occurred. The top of moist convection air can only attain between 600 hPa and 500 hPa levels. When MPV 10 and MPV 20, sudden heavy rain will probably happen.

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What this paper is about

By using the concept of moist potential vorticity, the characteristics of moist potential vorticity are analyzed in the process of the six heavy rain days over the middle Yunnan in June 1998. The results show that the very stiff moist isentropes and strong warm and moist air located its south can lead to the development of moist slantwise vorticity and the heavy rain occurred. The top of moist convection air can only attain between 600 hPa and 500 hPa levels. When MPV 10 and MPV 20, sudden heavy rain will probably happen.

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Available abstract

By using the concept of moist potential vorticity, the characteristics of moist potential vorticity are analyzed in the process of the six heavy rain days over the middle Yunnan in June 1998. The results show that the very stiff moist isentropes and strong warm and moist air located its south can lead to the development of moist slantwise vorticity and the heavy rain occurred. The top of moist convection air can only attain between 600 hPa and 500 hPa levels. When MPV 10 and MPV 20, sudden heavy rain will probably happen.

Key concepts: Vorticity, Potential vorticity, Positive vorticity advection, Climatology, Environmental science, Atmospheric sciences, Convection, Meteorology

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