恩施山区强冰雹和短时强降水天气落区分析

利用恩施雷达资料,对湖北恩施山区强冰雹和短时强降水天气的落区进行了分析。结果发现:强冰雹的右移特征非常明显,当恩施州境内或边境临近地区有新生的中空回波,且回波移动方向上也同时有对流回波滋生时,则两回波源地之间的区域基本可以确定为此次冰雹过程的主要影响区域,新生中空回波向右偏离初始移动方向大约0~60°之间(两处回波源地之间的连线),一般在1~3h内不断加强形成强冰雹而落下;而短时强降水右移特征不明显,发生短时强降水区域不仅与回波系统的走向和移动有关,还与回波单体移动和传播有关系,其回波系统的移动是对流单体的移动和传播两者的矢量之和,同时根据回波形态及其演变趋势,即可判断短时强降水的落区。 

Analysis on Falling Area of Severe Hail and Short-time Heavy Rainfall in Enshi Mountain

Using of Enshi radar and conventional observation data, falling area of severe hail and short-time heavy rainfall in Enshi mountain are analyzed.The results showed:the severe hail shifted to the right features is very clear, when new hollow cells are generating in Enshi or near the border areas, and newborn convection echoes on the direction of their movement together, then the area between the two sources is Identified the main effect of the hail region, new hollow echo cells to the right departure from the initial direction of movement (the connection line between two sources), between approximately 0 to 60 °, generally continuously strengthened within 1~3h, and the formation of severe hail and falling;while short-time heavy rainfall characteristics shifted to the right was not obvious, short-term heavy rainfall occurred not only with the echo system of regional orientation and movement, but also with the relationship between echo cells' movement and spread, movement of its echo system is moving convective cells and spread of the vector sum of both, combined with according to echo patterns and its evolution trend, so the falling area of short-time heavy rainfall can be confirmed.