Analysis Of The Adverse Wind Regions In Doppler Velocity

Doppler radar is a kind of new probe tool. It is valuable in nowcasting, especiallyin early-warning of rain-storm, hail etc. The Adverse Wind Regions(AWR) of rainfallareas are usually related to the center of rainfall areas and the strong convectionweather echoes. Studies of this meso and small scale Doppler velocity features areuseful to forecast the development or dissipation of the center of rainfall areas and thestrong convection weather echoes.This article defines the forms of AWR, the strength of the AWR and the thicknessof the AWR. Makes use of the Vertically Integrated Liquid Water(VIL)softwaresystem to record, analysis and contrast the VIL in the same position. By analyzing theAWR in Doppler velocity using the Doppler weather radar data in Taiyuan from 2003to 2005, we gets several regulations at last.The AWR appears mostly in strong convection weather, and small parts in greatprecipitation weather. The AWR regions mostly appear from May to September eachyear, and appear mostly from 12:00 to 20:00 every day. The AWR regions arecorresponding to the centers of the rainfall areas and the strong convection weatherechoes. Each AWR region has a procession from formation, development to disappear.The bigger the thickness of AWR and Z, the bigger of the VIL. In the same AWRregion, the strength and reflectivity are of positive correlation. If the AWR isconvergence or cyclonic, the strong radar echo will develop and build up. If the AWRis divergence or anticyclonic, the strong radar echo will weaken and disappear. Theappearing time of the AWR is one or two hours ahead of the time of rainfall, andwhich is valuable in nowcasting of rain-storm.