Analysis of a Short-time Severe Rainstorm on May 9, 2011 in Western Mountainous Area of Henan
Abstract：The rainstorm process on May 9, 2011 in western mountainous area of Henan was com- prehensively analyzed by using conventional observational data, NCEP data, wind profile products and single-measured data of Doppler radar and FY - 2C infrared cloud images. The results show that the west-erly trough at 500 hPa Hetao area, low vortex shear line in middle and lower troposphere and ground cold front are the main influencing system of the synoptic scale. The intersection of the intruded cold air and the warm and wet airflow in low troposphere has provided favorable instable conditions and trigger mecha-nism for the rainstorm occurrence. In the upper wind data, the establishment of southwester or southerly wind field at 600 hPa has caution effect for strong precipitation appearance. The 600 hPa wind speed is abrupt above 10 m/s, which can be used as a signal for storm appearance. The sharp decrease of tbb can be used as index of strong precipitation appearance in western mountainous area of Henan.
Keywords：severe rainstorm in western Henanmoisture flux divergenceradar productupper wind
Publication Date：2012-08-07
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 52-56 )