丽江市冰雹天气的红外云图和雷达回波特征分析

Characteristics of infrared cloud image and radar echo of Lijiang hail weather

利用丽江市2006-2008年3-9月的25次降雹资料,分析了丽江市冰雹时空分布特征和大气环流特征。选取2008年3月22日、6月9日和9月24日发生在丽江3次冰雹天气过程的红外云图和雷达回波进行分析,结果表明:春季南支槽冰雹天气云层厚度小(类似层状云降水)且TBB值较高,冰雹云雷达回波强度弱,高度低;夏秋季节在典型环流背景下,强对流冰雹云的TBB值最低、最集中、附近强对流天气单体活动最剧烈,在雷达回波上表现为较大区域内出现有组织、相对孤立的点状回波,这些点状回波发展较快、生命史较长,通过雷达加密监测,可及时发现对流天气并及时预警。

With 25 times of the hail weather data in March and September between 2006 and 2008 and the infrared cloud image and radar echo in the hail weather on March 22, June 9 and September 24, 2008 the temporal and spatial distribution and atmospheric circulation of the hail weather in Lijiang city am analyzed. The results show that the cloud layer thickness of the southern thorough in the Spring hail weather is small （looks like the stratiform clouds precipitation） and with the high TBB value the intensity of the radar echo of the hail cloud is weak and the height is low; In the autumn and sumrrm＂ typical circula- tion background the TBB value of the strong convection hail cloud is lowest and rnost ooncentrated. The strong convection rnonomer acts the most exquisite which shows the large area of systematical and relatively isolated dot echo with long echo life cycle and quick development. The developed characteristics of the convection weather can be found in time by frequent radar monitoring and the warming can be sent in time.