Mesoscale Modification of Synoptic Situations over the Area of Thunderstorms' Development as Revealed by Ats III and Aerological Data

摘要

Synoptical and dynamical aspects of the development of the tornado-producing thunderstorms of April 23, 1968, were studied by combining conventional observation data with ATS III pictures, with special emphasis on the interaction between the thunderstorms and large-scale field. Results of the analysis revealed a significant modification of moisture, thermal and wind fields in the vicinity of the area where storms developed. The formations of the large-scale cloud band and moist tongue were due to the mesoscale convective disturbances that developed along the frontal zone. It was concluded that the formation of a mid-tropospheric warm core accompanied by a strong upper outflow was the result of a process of so-called convective warming. (Author)