Abstract
Approximately 150 POTEKA weather observation equipments are installed and compose a high density ground surface observation network (POTEKA network) with the spatial resolution of approximately 1~2 km on the plain of Gunma and Saitama prefectures in Japan. Downburst gust prediction algorithm with POTEKA network can detect the occurrence of downburst gust of temperature drop type in advance on this plain. Moreover, this algorithm can precisely predict the gust damaged area and the gust occurrence time for the 3 eminent downbursts of the F1/JEF1 category. As the result of the accuracy verification of the gust prediction algorithm, the threshold of 2 ℃ drop in 1 minute is precise. Also, it is confirmed that the resolution of approximately 1~2 km assures the lead time of approximately 30 minutes before the gust occurrence and the precise narrowing function of prediction area.
