The goal of the project on tropical cyclones is to develop a theory for the transformation of tropical depressions into tropical cyclones and the subsequent process of episodic reintensification that sustains and increases the tropical cyclone intensity. The theory is based on transient growth forced in an atmosphere of near neutral static stability.
Montgomery, M. B., and B. F. Farrell, 1993: Tropical cyclone formation. J. Atmos. Sci., 50, 285-310. pdf