基于雷达产品的朝阳地区短时强降水短临预警指标研究

Research on Short-term and Imminent Warning Index Technology of Short-time Heavy Rain in Chaoyang Area Based on Radar Products

利用朝阳地区138个区域自动站逐小时观测资料,对2011—2020年发生在朝阳地区的短时强降水天气过程进行统计,得出朝阳地区短时强降水多发生在6—8月,7月出现次数最多;短时强降水具有明显的日变化特征,活跃时段为15:00-23:00,主峰值出现在17:00前后,午夜04:00为短时强降水的次峰值。结合朝阳新一代多普勒天气雷达产品对短时强降水进行分析,将雷达产品按照回波特征分为3类,分别统计得出不同雨强对应的雷达产品短临预警指标。

Based on the hourly observation data of 138 regional automatic stations in Chaoyang area,this paper calculates the short-time heavy rain weather process from 2011 to 2020.The results show that the shorttime heavy rain mostly occurs from June to August,and the frequency is the most in July.The short-time heavy rain has obvious diurnal variation characteristics,the most active time is 15:00-23:00,the main peak appears around 17 o’clock,and the second peak of the short-time heavy rain is at 4 o’clock at midnight.Based on the analysis of the shorttime heavy rain of Chaoyang new generation doppler weather radar products,the radar products are divided into three categories according to the echo characteristics,and the short-term and imminent warning indexes of the radar products corresponding to different rain intensities are obtained.