Lightning Risk Warning Method Using Atmospheric Electric Field Based on EEWT-ASG and Morpho

Abstract

The current methods for lightning risk warnings that are based on atmospheric electric field (AEF) data have a tendency to rely on single features, which results in low robustness and efficiency. Additionally, there is a lack of research on canceling warning signals, contributing to the high false alarm rate (FAR) of these methods. To overcome these limitations, this study proposes a lightning risk warning method that incorporates enhanced empirical Wavelet transform-Adaptive Savitzky–Golay filter (EEWT-ASG) and one-dimensional morphology, using time-frequency domain features obtained through the Wavelet transform (WT). The proposed method achieved a probability of detection (POD) of 77.11%, miss alarm rate (MAR) of 22.89%, FAR of 40.19%, and critical success index (CSI) of 0.51, as evaluated on 83 lightning events. This method can issue a warning signal up to 22 min in advance for lightning processes.

Keywords

• atmospheric electric field (AEF)
• lightning risk warning
• enhanced empirical wavelet transform-adaptive Savitzky–Golay filter (EEWT-ASG)
• one-dimensional morphology
• wavelet transform (WT)