Experimental Study on Lightning Warning by Atmospheric Electric Field

The atmospheric electric field intensity threshold method is generally used for lightning warning at present. However, this method has the problem of high false alarm rate. The lightning warning effect can be effectively improved by combining the electric field change rate threshold of 5 minutes and electric field threshold. The lightning warning effect can be effectively improved by combining the 5 minutes electric field change rate threshold with electric field threshold. The threshold value of electric field and the threshold value of electric field change rate in Wenjiang can be obtained by using the statistical method to approach the actual first and last moments of lightning weather, and a lightning warning model based on atmospheric electric field is established. The lightning warning model is verified with the lightning monitoring data from 2014 to 2017. The results show that: 1) The success rate of lightning warning is 74.2%, the false alarm rate is 12.9% and the missing alarm rate is 9.7%. 2) The start warning for the lightning weather process was 2.2 minutes ahead, and the end of the lightning weather process was 4.4 minutes behind. The warning time series basically covers the lightning weather process, and meets the need of short local warning for the lightning weather process.