The most important motivated mechanism which caused the heavy rain in Fuyuan and Malong is the coupling of stronger ascending motion and profound saturation air column.
A seldom snow process in Turpan in February 2000 is analysised. It is shown that the snow have been brought by strong ascending motion of lower troposphere and abrupt enhancement of low- level jet.
The simulated results show that there are two obvious water vapor channels during the freezing-rain process, and the ascending motion is significant.
The compensating descending motions normally occur over a much larger area than the ascending motion.
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