临近预报

对流性天气的气候背景分析是临近预报的基础，是做好北京2008年奥运气象服务必不可少的准备工作。

Climate background analysis of convective weather was the foundation of nowcasting , which was the necessary to Olympics weather service in2008 .

一种改进后的交叉相关法（COTREC）在降水临近预报中的应用

Application of an improved TREC algorithm ( cotrec ) for precipitation nowcast

最后，通过VIL值的变化与反射率的变化特征，得出冰雹预警的临近预报。

Finally , through the VIL value changes and reflectivity variation characteristics derive hail warnings .

利用多普勒雷达资料，采用一种改进后的交叉相关法（COTREC）建立了一种降水临近预报方法。

Using Doppler radar data , an algorithm for precipitation nowcast is set up by applying an improved cross-correlation extrapolation method ( COTREC ) .

通过对它们的识别及与降水特征、暴雨落区的比较研究，表明这些中尺度系统在暴雨的临近预报中都有明确的指示意义。

It shows that these mesoscale systems are obvious signals for rainstorm feature .

哈尔滨市短时临近预报业务系统

The short-term weather forecast operation system of Harbin

多普勒天气雷达的径向速度产品是制作“雷打雪”天气短时临近预报的重要依据。

Radial velocity products of Doppler weather radar are the important basis for short-term forecast .

以天气雷达体积扫描的资料为基础，采用交叉相关法建立了一种对暴雨的临近预报方法。

Based on the Doppler radar data , a technique is described with the cross correlation method to heavy rainfall nowcast .

已通过误差分析和实际使用效果证明了本临近预报辅助系统的应用价值。

We have already proved the price of the system through the error analysis and the practical application of results in our work .

提高对流天气临近预报准确率的关键问题之一是了解大气的垂直稳定度和垂直风切变。

To improve the accuracy of convection weather forecast , one of the key issues is to find out the atmospheric vertical stability and wind shear .

文章揭示了该地区超级单体风暴的多普勒雷达回波典型特征，旨在对这类强天气的监测、识别和临近预报提供天气学及雷达回波分析的参考依据。

This paper reveals the radar echo characteristics of a supercell storm , offers reference on synoptic and radar echo to detect and nowcast severe convective storm .

为了提高气象预报业务水平，特别是强对流天气的临近预报能力，提出利用高斯描绘子来进行识别和跟踪天气雷达的回波轮廓。

For improving the level of weather forecast , a new method that weather radar echo boundaries can be recognized and tracked by Gaussian descriptors is proposed .

利用多普勒雷达体扫描资料对风暴进行实时地自动识别、跟踪、结构分析和临近预报。

A methodology is presented for the real time , automated identification , structure analysis , tracking and short range forecasting of storms with Doppler weather radar volume scan data .

利用地面、高空及云图、雷达资料对2005年8月22日晚一场袭击农六师各地的大风天气过程进行了分析总结，并得出一些对临近预报有意义的结论。

A gale hit the 6th agricultural division on August 22, 2005.Based on several materials such as surface , high altitude and radar data , this paper analyzed and summarized the gale weather process , then got some conclusions that will be referred to gale forecast and warning .

逆风区、中小尺度的辐合辐散都与强降水之间存在着密切的关系，是临近降水预报的重要指标；

Upwind section and middle-small scale confluence ( divergence ) were in close connection with strong precipitation and that is an important index on precipitation prediction ;

结果表明：大气风廓线仪对水平风的垂直结构有较强的探测能力，能实时监测中尺度降水期间风的垂直切变和对流特征，有助于提高临近天气预报的精度，准确预报降水。

Results also show that the vertical structure of wind detected by atmospheric wind profiler is better , it can real-time monitor vertical shear and convective characteristics of wind during mesoscale precipitation , and it can improve accuracy of the rainfall forecasting too .