Anomaly of the Moist Potential Vorticity Substance with Mass Forcing and Its Application in Diagnosing Mei-Yu Front Rainfall  | 
	
|   Figure 2   a MPVS shaded and solid lines, 10 6  K m -1  s -1  and potential temperature dashed line, K at 700 hPa at 0000 UTC 23 June 1999, and b 24-h precipitation mm observed on 23 June 1999. The area of MPVS#cod#x003b2;#cod#x02265;#cod#x003b2;0.3 and rainfall amount #cod#x02265;#cod#x003b2;10 mm are shaded in a and b respectively.  | 
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