Analysis of the Doppler Radar Data of a Hail Weather in Sanmenxia

doi:10.3969/j.issn.1673-7148.2012.03.008

Abstract：Using conventional meteorological data and Doppler weather radar data on July 17, 2011 in Sanmenxia, a hail weather process was analyzed from the weather situation, the physical quantity field and the echo evolution characteristics. The results showed that： the process belonged to cold vortex type in north China and the upper cold air intrusion played a triggering role on the release of unstable energy. It was a single monomer strong severe convective storm from Doppler weather radar data. The maximum reflectivity （DBZM） which was over or equal to 60 dBz, and the jump interment of echo top （ET）, storm top height（TOP） and the maximum reflectivity height （ET） had 24 rain in advance with hail time. Hail occurred in the period of the maximum reflectivity （DBZM） was over or equal to 60 dBz, TOP and HT were at weakening stage, ET and DBZM were at maximum stage. The value of vertical integrated liq- uid water （VIL） and VIL density had a sharply increasing before the failing large hail; the warning time of this hail was 12 min. Adverse wind area and hail index alarm on the ＂POS＂ had an important implica- tion of hail forecasting and early warning.