A HIGH-RESOLUTION ANALYSIS METHOD OF INSTABILITY ENERGY

This paper describes a geopotential thickness difference method for computing instability energy E. EP1P2 =g0 ( HsP1P2-HP1P2 , where HP1P2 is the geopotential thickness of P1-P2 level; HsP1P2 is called adia-batic geopotential thickness, based on which a computational method for high resolution of instability energy is proposed. E(x,y)g0(A(x,y) - B(x,y)), where A is interpolating polynomial of HSP2P2 and it is afunction ofe, of surface observing stations (x, y); B(x,y) is the thickness over corresponding stations (x, y) obtained using surface fitting method. Therefore, data of METAR can be used by computer to produce hourly horizontal distribution chart of E of surface observing station density. With the result that the temporal and spatial resolution of stability analysis has been improved. Practical use has shown that this method is an effective tool for very short range forecast of severe convective storms.