Cloud street patterns of winter precipitation in Yamaguchi [Japan]
2006
Suzuki, K.(Yamaguchi Univ. (Japan). Faculty of Agriculture) | Ohnishi, Y. | Hayakawa, S.
In this study we examined winter precipitation patterns in Yamaguchi, a relatively warm region of Japan, using Japan Meteorological Agency weather radar data from 1989 to 1998. During cold air outbreaks, radar echoes commonly revealed the formation of cloud streets. We classified band-shaped patterns of cloud streets into four different groups on the basis of band-transverse directions. The WNW and NW band-transverse directions were dominant, accounting for 70% of all occurrences. The band-transverse directions corresponded with the 850 hPa wind direction, as was similarly observed in northern Japan. Local winter precipitation was strongly related to the band-transverse direction of radar echoes. High concentrations of radar echoes were characterized by their directions in relation to the orientation of the coastline.
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