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"尤特"台风路径摆动与预报对策 总被引:1,自引:1,他引:0
"尤特"台风是2001年对广东地区造成重要影响的热带气旋,它在移近菲律宾前后,路径出现了明显的摆动.本文分析了"尤特"台风期间的天气形势和移动路径的摆动特征;同时通过分析经过菲律宾东北部的西行台风及南海北上台风摆动路径的重要特征,总结影响我省的西太平洋地区台风移动的摆动特点;最后讨论了具有摆动路径台风的预报服务的对策,表明了重视台风移动路径摆动性对改善预报服务具有重要意义. 相似文献
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Following previous studies of the rainfall forecast in Shenzhen owing to landfalling tropical cyclones(TCs), a nonparametric statistical scheme based on the classification of the landfalling TCs is applied to analyze and forecast the rainfall induced by landfalling TCs in the coastal area of Guangdong province, China. All the TCs landfalling with the distance less than 700 kilometers to the 8 coastal stations in Guangdong province during 1950—2013 are categorized according to their landfalling position and intensity. The daily rainfall records of all the 8 meteorological stations are obtained and analyzed. The maximum daily rainfall and the maximum 3 days' accumulated rainfall at the 8 coastal stations induced by each category of TCs during the TC landfall period(a couple of days before and after TC landfalling time) from 1950 to 2013 are computed by the percentile estimation and illustrated by boxplots. These boxplots can be used to estimate the rainfall induced by landfalling TC of the same category in the future. The statistical boxplot scheme is further coupled with the model outputs from the European Centre for Medium-Range Weather Forecasts(ECMWF) to predict the rainfall induced by landfalling TCs along the coastal area. The TCs landfalling in south China from 2014 to 2017 and the corresponding rainfall at the 8 stations area are used to evaluate the performance of these boxplots and coupled boxplots schemes. Results show that the statistical boxplots scheme and coupled boxplots scheme can perform better than ECMWF model in the operational rainfall forecast along the coastal area in south China. 相似文献
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A non-parametric method is used in this study to analyze and predict short-term rainfall due to tropical cyclones(TCs) in a coastal meteorological station. All 427 TCs during 1953-2011 which made landfall along the Southeast China coast with a distance less than 700 km to a certain meteorological station- Shenzhen are analyzed and grouped according to their landfalling direction, distance and intensity. The corresponding daily rainfall records at Shenzhen Meteorological Station(SMS) during TCs landfalling period(a couple of days before and after TC landfall) are collected. The maximum daily rainfall(R-24) and maximum 3-day accumulative rainfall(R-72) records at SMS for each TC category are analyzed by a non-parametric statistical method, percentile estimation. The results are plotted by statistical boxplots, expressing in probability of precipitation. The performance of the statistical boxplots is evaluated to forecast the short-term rainfall at SMS during the TC seasons in 2012 and 2013. Results show that the boxplot scheme can be used as a valuable reference to predict the short-term rainfall at SMS due to TCs landfalling along the Southeast China coast. 相似文献
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雷暴云团自动识别和边界相关追踪技术研究 总被引:9,自引:0,他引:9
基于高时空分辨率雷达资料的雷暴云团识别、追踪及预警技术是目前最重要的临近预报预警技术之一.该文描述的雷暴云团边界相关追踪技术是一种新研究的方法,该方法是利用模式识别技术进行云团边界识别、拓扑处理,建立云团生命时序与族谱关系,并在此基础上进行雷暴云团外推的一种短时临近预报方法.该方法有三个主要技术环节:(1)对已预处理的雷达数据进行边界识别;(2)利用四分树匹配分析因子、重叠因子、面积因子、外接矩形因子、轮廓综合因子、局部相似判定因子等六个判断因子,分别识别出每个云团的时间序列,以及每个云团的运动方向、速度、面积、强中心,以及所处的状态(增强或减弱、膨胀或缩小)等信息;(3)对云团的移动方向、速度、面积、强度进行线性外推.初步结果显示该方法可较好地识别和外推预报雷暴云团.在此基础上建立的雷暴自动识别和追踪系统(简称"追踪者",TRACER),可以基于地图系统选取指定云团,获得云团空间位置信息、发展轨迹、演变特征和未来预测,也可对云团预报结果进行定量分析和验证. 相似文献
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自从微波专线开通之后.我台和广州区域中心电信台之间的通信状况有很大的改善。通信质量和通信内容都有了显著提高。我台从广州拷贝到的气象资料成倍地增多,预报员可以掌握的气象资料更多了。但是随着我台业务的发展和城市气象服务对气象时效的要求,原先利用手动从广州中心拷贝气象资料的方式已不合适。为此我们用C语言开发了一个全自动的资料获取系统(以下简称资料获取系统)。本系统在1995年5月投入业务运行。1.资料获取系统的设计思路资料获取系统能够全自动从广州区域气象中心电信台拷贝气象资料到我台的NOVELL网。该系统是在现… 相似文献
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