NAME =  Mr.Yusuke Yamane  
ORGANIZATION =  Disaster Prevention Reserch Institute, Kyoto University  
ADDRESS =  Gokasyo, Uji, Kyoto 611-01, Japan  
COUNTRY =  Japan  
PHONE =  0774-38-4309  
FAX =  0774-38-4181  
E-MAIL =  yamane@rcde.dpri.kyoto-u.ac.jp  
POSTER_ONLY =  yes  
THEME =  T2  
DATE =  31-Jul-04-15:21:41  
ABSID = T2MY31Jul04152141 
TITLE = Seasonal and spatial variation of CAPE and occurrence of meso-scale disturbances in the South Asia 
AUTHOR_1 = Mr.YusukeYamane 
INSTITUTION_1 = Desaster Prevention Reserch Institute, Kyoto University 
PRESENTER = AUTHOR_1 
AUTHOR_2 = Dr.Taiichi Hayashi 
INSTITUTION_2 = Desaster Prevention Reserch Institute, Kyoto University 
ABSTRACT =  Severe meso-scale disturbances occur frequently in the northeastern region of the Indian subcontinent including Bangladesh.  These thunderstorms are locally known as gNorfwesterh (because thunderstorms often come from north westerly direction).  These disturbances are sometimes accompanied with destructive tornadoes and cause serious damages.  The occurrence of these thunderstorms concentrates in the pre-monsoon season (from March to May). 

 The thermal stratification affects primarily for the occurrence and the development of these meso-scale disturbances. In this point, the seasonal and spatial variation of the distribution of the thermal instability is important in the Indian subcontinent. In this paper, the variation of distribution of monthly averaged CAPE (Convective Available Potential Energy) in the South Asia in 1993 is examined by ECMWF 40 Years Re-Analysis data (ERA-40).  As a result, the region of the relatively higher CAPE (>2400J/kg) is found just over Bangladesh in May.  The value of CAPE in May is the highest over the South Asia in 1993, which indicates that most possibility of the occurrence and the development of the severe disturbances. In April and March, the region of the relatively higher CAPE is also found over Bangladesh. However, the value is not the most highest over the South Asia in each month.