| Title |
A Proposal on the Development Method of a New Lightning Warning System for Effective Alerts |
| Authors |
Hae-Sup Shim ; Bok-Hee Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2015.29.12.068 |
| Keywords |
New Lightning Warning System ; Effective Alerts ; Effective Lead Time ; Flexible two areas ; Probability of Detection ; False Alarm Ratio |
| Abstract |
We examine the standalone lightning warning system (LWS) and its warning performances for three years. This system acquires and analyzes the data of cloud-to-ground strike (CG), intra-cloud discharge (IC) and electrostatic field (EF) to produce prior warnings with respect to the impending arrival of CG in the area of concern (AOC). The warnings in this system are carried out based on the fixed two areas method. To evaluate warning performances, we analyzed the statistics of warnings with probability of detection (POD) and false alarm ratio (FAR). Based on the previous study, we revised the trigger and clear conditions of lightning warning for improving the performances of the system. As a result of this revision, POD increased from 0.18 to 0.44 and FAR decreased from 0.96 to 0.78 during the summer of 2014. However, the LWS was not possible to trigger effective alerts (EA) because there was no effective lead time (LT) for the fixed two areas method. Problems related to the low detection efficiency of IC and the use of EF data for warnings still decreased POD and increased FAR. Hence, we proposed the development method of a new LWS (NLWS) that would be composed of integrated weather data, the flexible two areas and the user software in order to trigger EA and improve warning performances. |