Using remote sensing data of satellite and the new
generation weather radar, together with NWP
products and conventional observation, a study on an
extreme torrential rainfall in the arid area of
northwest China was conducted. The results show that
1. The extreme torrential rainfall happened under a
unique circulation background of west stretching
subtropical high pressure in the medium latitude which
is caused by landing tropical cyclone. 2. The data of
radar indicated the train-effect caused by the low
centroid strong echoes lead to severe precipitation. 3.
The meso-γ scale gust nucleus, corresponding
convergence-divergence, and vertical motion are
major affect systems. 4. High efficient vapor
transportation of southwest jet at low altitude
indicated by VWP of radar and satellite image was the
key factor of the extreme torrential rainfall. 5. The
cold air invasion at med-high altitude and the moist
air coming from the mid-low altitude revealed by
satellite provided favorable condition for the heavy precipitation.
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