This tendency is stronger in the south and west, and especially in Kyushu, at the rate of once in ten-odd years, the amount of rainfall equal to that for a year rains in a week.
南及び西ほどこの傾向が強く、特に九州では、十数年に1回程度の割合で、この時期に一年分の降水量がわずか一週間で降ることもある。