The circulation feature of a mesoscale system and its dynamical and thermal characteristics in the phase of development are studied through analyzing and simulating for the rainstorm process which occurred in central Western Shaanxi province during 2829 July 2011 by observational data, NCEP final analysis data and high resolution output by mesoscale model WRF V3.4. Synoptic analyses indicate that upper troughs and low level shear are the main weather systems for this rainstorm. Diagnoses of the physics fields suggest that stronger upper divergence and week lower convergence associated with positive vorticity and strong vertical motions in the strong precipitation region during the developing phase of the rainstorm. At the initial phase of the rainstorm, Convective Available Potential Energy(CAPE) was accumulated and which was triggered and released rapidly (decrease 2200 J·kg-1 in 12 hours) by the strong vertical motions, which causes such a strong rainstorm. The strong precipitation in 3 hours occurred around the shear line on 850 hPa which was associated with high CAPE value. The analysis on the residual of Non-linear Balance Equation (NBE) features shows that the high residual of NBE appeared around the heavy precipitation area, which has close relationship with the adjustment between momentum and mass field.
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