A Case Study of A Series of Showers

[摘要] In this paper are presented the results of analysis and discussion about a series of showers. Character of showers under consideration is as follows: (a) this series of showers consists of at least 25 separated cells of rain regions (the writer calls these cells“Rregions”in this paper);(b) five narrow parallel much-precipitated stripes appeared in the precipitated area as a result of passage of showers;(c) every showers moved in the same direction at a speed of 70km/hr during the period under consideration;(d) no abrupt change of surface meteorological elements was observed at the time of passage of R-regions.The existence of low-level jet stream above the precipitated area was found and the relation between the low-level jet and the mechanical properties of Rregions are discussed.It is shown that the upper disturbances, which caused the precipitation, had wave nature and it is suggested that this wave was produced in the vicinity of frontal layer by a strong wind shear near jet stream.

[学科分类] 大气科学