Observational findings reveal factors influencing tropical cyclone structure and intensity dynamics.
A brief summary of new observational inferences on the genesis, structure, intensity change, and motion of tropical cyclones that have been obtained by the rawinsonde composite analysis is given. It is shown that tropical cyclone intensity change is primarily related to the degree of thermal wind imbalance occurring in the system and not to the amount and/or concentration of cumulus convection. Cyclone intensity is not well related to the strength of the cyclone's transverse circulation and/or amount of deep cumulus convection. The likely fundamental role for cyclone genesis and intensification of the vertical rearrangement of horizontal momentum by Cb up and down draughts is discussed. Basic characteristics of tropical cyclone structure are discus-sed. Tropical cyclone motion as related to upper and lower tropospheric winds and horizontal gradients of tropospheric temperature across the cyclone is discussed. Suggested new ways of utilising jet aircraft reconnaissance for cyclone intensity, motion and intensity change are presented.
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W. M. Gray (1979) studied this question.
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