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We analyze a set of observation data of high resolution Precipitation Nowcasts on localized heavy rains to extract their spatio-temporal structures. The data is chosen to be that of Mikawa region (lat...itude: 136.5〜137.9, longitude: 34.4〜35.8) from 21th August to 11th September of 2016. The resolutions of the observation are spatially 250 meters, and temporally 5 minutes. From the time evolution of the two-dimensional distribution of the rainfall, the spatiotemporal structure above the certain threshold for the rainfall is extracted as a three-dimensional pattern in space and time. Unifying the extracted structures and their locations, the birthplace, the life time and propagation speed and its direction of the extracted rainfall are systematically obtained. For the analyzed data, the heavy rains prone to occur on the Pacific region and to propagate northeast ballistically.show more
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