1 Theoretical research works in Institute of Heavy Rain 2 Evolution and propagation of MCSs over Meiyu fronts and inertia-gravitational wave-CISK. Hu Bowei （胡伯威） Wang Xiaofang （王晓芳） Cui Chunguang( 崔春光 ) (Institute of heavy rain,China Meteorological Administration,Wuhan 430074,China).
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1 Theoretical research works in Institute of Heavy Rain2 Evolution and propagation of MCSs over Meiyu frontsand inertia-gravitational wave-CISK
Hu Bowei（胡伯威）Wang Xiaofang（王晓芳）
(Institute of heavy rain,China Meteorological Administration,Wuhan 430074,China)
2 Evolution and propagation of MCSs over Meiyu fronts Rainand inertia-gravitational wave-CISK
1998072108 Rain（Beijing Time）
Such MCSs usually appear the “up and down—stream development” phenomena and hence a “cloud clusters wave
train” along the Meiyu fronts. This often cause the locally outburst heavy rain, which the forecasters can not track before.
CISK is not only related to the atmospheric humidity condition and the convective instability energy but also related to their horizontally non-homogeneous distribution. So the effect of “Low-level moisture front”, which is adhering to the Meiyu front, is the important factor that must be considered.
Here the terms containing ( ) are omitted, and ( ) is in direct proportion to the weighted vertically integration of moisture in the lower troposphere. The equations system is reduce to:
the stability is also influenced by the -ward second order
derivative of the humidity field M2 ( ),
The contribution of M2 is maximal where its negative value takes the maximum ,and this place is just near the south border of the “moisture frontal zone”.
So here the largest increase rate occurs.
The condition permitting the development“up and down-stream development” to occur:
In stable range:
In instable range: