Simultaneous occurrence probabilities of rainfall among nine locations in Japan

Observation of rainfall has been performed at nine sites in Japan by NHK (Nippon Hoso Kyokai, i.e. Japan Broadcasting Corporation) during the BSE (Japan´s medium-scale broadcasting satellite for experimental purposes) experimental period (1978¿1981). The simultaneous occurrence probabilities of rainfall were obtained for 36 pairs of combinations among nine distant locations in Japan, and showed a clear dependence on the separation distances. It is found that this dependence of simultaneous rainfall probabilities on the separation distances is much larger than that of Italy.