Nafiseh Pegahfar - Assistant Professor, Atmospheric Research Center, Iranian National Institute for Oceanography and Atmospheric Science, Tehran, Iran,

Various environmental factors affecting formation and intensification of tropical cyclone (TC) contribute in challenges of TC prediction. So different approaches andempirical indexes have been established to investigate influence of these factors on TC. Meanwhile, those related to the thermodynamic parameter of entropy have beenconsidered further, because variation of this long-lasting parameter can preclude incipient dispersion development to a tropical cyclone. Moreover, outward eddy flux ofentropy along with its advection into a TC play significant role in TC intensification and weakening. In addition, infiltration of low entropy air into a TC can decrease theefficiency of TC heat engine ([1]). The schematic view of infiltration of low-entropy air into a TC has been shown in Figure1.