摘要: The monsoonal regions of the world are characterized by a seasonal reversal in direction winds associated with excursion equatorial trough (or ITCZ) response to variation latitude maximum insolation. This circulation is planetary scale phenomenon. However, precipitation critically dependent on organization cumulus clouds (typically few kilometers horizontal extent) over synoptic vortices hundred extent). Thus modelling transitions and intraseasonal fluctuations requires an understanding fluid mechanics these three scales organizations their interactions. present paper attempt outline current state phenomena.