Diagnostic analysis of a heavy rain process occurring over Ningxia on July 29, 2012
By using the NCEP reanalysis data, conventional observation data, numerical prediction model products, satellite data, radar and automatic meteorological station data, an anlysis was made of a storm process that occurred over Yinchuan City of Ningxia on July 29, 2012. Also analyzed were the variation characteristics of heat and power condition during the heavy rain. The result mainly showed that the weather systems that caused the heavy rain were of West Pacific subtropical high, short-wave trough at 500 hPa, and the warm shear line. Suiting well with the joint of the divergence center and the convergence one, this heavy rain occurred around the crossing area of the cold and warm streams. Before the storm, specific humidity and water vapor flux increased rapidly. θse vertical profiles between the 500～400 hPa showed a small value area thatθse 6 336 K. Moisture flux divergence changed rapidly just at the beginning of the precipitation, which means that water vapor transmission and convergence cooperation completed in a very short time, causing the rapid and intense weather phenomena.
heavy rainprecipitation circulationweather systemanalysisNingxia
NETL
NSTL
万方数据
维普
