河北省西南部逐时降水气候特征分析及雨量产品色标修订

利用河北省中南部1999～2005年95个气象站4～10月自记雨量资料,初步分析了逐时降水的统计学特征量,得到了逐时降水的空间分布特征和统计学基本规律:河北省中南部逐时降水具有明显的地理和季节分布特征,强度一般在早晨或傍晚最大,上午最弱.根据逐时降水量级分布情况,调整雷达雨量产品色标设置:小值区间间隔小,大值区间间隔大,突出显示小值降水的层次,跟踪降水中心发生、发展及移动,对降水精细化预报有一定的指导意义.

Climatic Characteristic Analysis of Hourly Precipitation Rainfall over Southwestern Hebei Province and Its Product's Color Scale Modification

The statistic characteristics of hourly precipitation are preliminarily analyzed on basis of automatic rain gauge records from 95 weather stations from April to October, 1999 to 2005 in the mid southern Hebei Province. The spatial distributional characteristics and basic statistic regularities of hourly precipitation are obtained. It is found out that the distribution of hourly precipitation has obvious geographical and seasonal features; the intensity is generally the largest at dawn or in dusk, and the smallest in the morning. The color scale of the radar precipitation product is adjusted according to the distribution of rainfall measurement, whereby the interval is shorten in the small value range and lengthened in the large range, which can highlight the levels of little values in rainfall display, and can track the genesis, evolution, and movement of rainfall centers. The product has certain significance to the refine precipitation forecasting.