Regional differences in hourly rainfall characteristics over the southeastern extension of the Tibetan Plateau

The southeastern extension of the Tibetan Plateau (SETP) is distributed by typical longitudinal mountains and has unique climate characteristics significant regional differences. diurnal cycles rainfall amount, frequency, intensity over SETP in warm seasons (May–September) were investigated using high-density hourly station data possible mechanisms discussed analysing ERA5 reanalysis satellite data. largest amounts appeared on southern western margins SETP, amount was relatively small at higher elevations SETP. Located adjacent (Reg_W) eastern (Reg_E) regions presented a similar intensity, but features two quite different. had dominant peaks late afternoon Reg_W, while early morning Reg_E. A secondary peak can be found Reg_W. closely related with low-level atmospheric conditions distribution clouds. enhanced convergence anomalous southerly winds sufficient water vapour after midnight contributed to nocturnal edge In afternoon, lower surface air temperature more stable stratification Reg_E, as compared unfavourable for occurrence convection.