Based on the analysis of moist potential vorticity(MPV) for the rainstorm of early typhoon 0601,we discussed the effect of the westelies cold air on the early typhoon rainstorm from the viewpoint of MPV and MPV advection.

An Analysis of Moist Potential Vorticity for Early Typhoon Rainstorm;

Diagnostic analysis of moist potential vorticity for local heavy rain

Based on the analysis of moist potential vorticity(mpv) for the typhoon "Haitang" inverted trough which caused rainstorm in Henan province,the results show that slantwise vorticity development is one of the important mechanisms of the rainstorm occurrence and intensification.

An Analysis of the Relationship between MPV and Q-vector and Heavy Rain in East Part of North West China;

As a result,the negative MPV center at 700 and 850 hPa agrees well with the severe precipitation region in 850 hPa located the side of warm and moist airflow 110 kilometers away from the negative MPV center whose size can reflect the precipitation intensity.

Results show that the heavy rain events occurred in the very stiff and dense section of e concentrated reagion,which can lead to the development of moist slantwise vorticity;When MPV1<0 and MPV2>0 in the low troposphere the rainstorm will probably happen.

In this paper a set of equations of wet potential vorticity is founded, the basiccriterion of non-conservation is set up, and the dynamics character of the non-conservationmotion is analysed.

The characteristics of conservation of wet potential vorticity of large scale weather systems are obtained by means of the scale analysis.

We make a diagnostic analysis about the evolution and distribution of the wet potential vorticity of the integral result of the model simulation at each time.