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Formation Mechanisms of A Regional Rainstorm under the Stable Atmospheric Stratification
Pages: 1317-1326
Year: Issue:  5
Journal: Plateau Meteorology

Keyword:  Atmospheric stratification convective stabilityRainstormWater vapor conditionFrontal zoneVapor convergence;
Abstract: The course of a regional rainstorm from 5 to 6 September 2011 in the middle of Shannxi province is integrated analyzed by using the routine meteorological observation data,surface hourly precipitation,physical quantity field,radar and satellite cloud imagery data. The result shows that the regional rainstorm appears in continuous rain which covers central and southern Shaanxi,with characteristics of weak precipitation intensity,long duration and not much local. It is a steady precipitation. This strong precipitation occurred under the condition of stable atmospheric stratification convection;Lower and elevated CAPE are both 0 J·kg-1. By analyzing conditional symmetric instability conditions,it finds that vertical movement of the early precipitation comes from the forced fronts and conditional symmetric instability condition.,while the vertical movement lately mainly comes from forced fronts. The cold air form the east area in low level not only plays the role of rising cold wedge,but also enhanced the atmospheric baroclinicity and frontal zone at lower level. Above all,they are conducive to the generation of heavy rain. It is confirmed by satellite cloud imagery and radar echo that strong precipitation is formed by the weak convective cloud belt or stratiform cloud;Low level flush water vapor condition,strong frontal zone and vapor convergence are the main course of the rainstorm.
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