ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 37 Issue 10 > 2011,37(10):1185-1195. DOI:10.7519/j.issn.1000-0526.2011.10.001 Prev Next
Eight Kinds of Strong Convective Weather Situations and Related CloudType Characteristics in Jiangxi
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Abstract:
By means of 11 year (1999-2009) data, such as infrared cloud image, synoptic chart, lightning and ground dangerous telegram, aiming at the 62 processes of strong convective weathers in Jiangxi, on the basis of analysis of largescale circulation background when convective weather happens, the features of typical clouds from occurrence and development of mesoscale convective cloud band which triggers convective weather were abstracted. It showed that eight types of cloud features are typical cloud patterns forming convective weather in Jiangxi, which include the strong convective cloud type in the edge of subtropical high, the strong convective cloud type in tail of baroclinic disturbance cloud system, MCS in a ground inverted trough， easterly wave （inverted trough of tropical depression）, the strong convective cloud band ahead of cold front, MCC ahead of cold front, the strong convective cloud type behind an uppertrough, tropical cyclone and its peripheral cloud type of squall line. The eight kinds of cloudbased features are closely related to the strength and relative position of affected systems such as low trough, shear, cold air, east wind wave and tropical cyclone, upperair jet and others. The strong convective cloud types in tail of baroclinic disturbance cloud system, the strong convective cloud band ahead of cold front, and MCC ahead of cold front are often related to stronger lower air activities. When 500 hPa trough’s meridional degree is large, and lowlevel warm advection in front of the trough is obvious, baroclinic disturbance clouds are prone to occur, a convective weather easily occurs at its tail. On the other hand, mesoβscale convective cloud clusters are easy to merge into MCC at abnormal warming center before the front and the unstable center. Rear of the upper trough, edge of the subtropical high and easterly wave are related to the interaction between highlevel dry cold air and weather system at mid and lowlatitudes, when highlevel negative temperaturevariation or water vapor “dark zone” moves closely to the lowerlevel convergence system, then an MCS develops. When divergent airflow and divergent cirrus clouds occur at the upper level, the MCS near the convergence line of a ground invertedtrough develops strongly. Additionally tropical cyclone and its peripheral cloud type of squall line are closely related to the typhoon. The predictable indicative of the strong convective cloud type in tail of baroclinic disturbance clouds is the best.
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