Abstract
In summer season, the frequency and amount of rainfall become large over the mountain slopes surrounding a basin. As one of the examples, the distribution and increase of rainfall over the slope of Mt. Kushigata on west side of Kofu Basin were investigated using X-band multi-parameter radar (X-MP radar) data. The rainfall amount estimated from June to September on 2009 using X-MP radar became large at the lower layer over the slope. On the case study on 27 July 2009, the increase of rainfall intensity at the lower layer was discussed from the growth of raindrops originated from the brightband falling through the low-level precipitating system formed over the slope. The results provide not only the more understandings of distribution and increase of rainfall over mountain slopes surrounding a basin but also the availability of the X-MP radar installed in a basin for the observation of rainfall associated with small-scale meteorological phenomena on a slope.
