Diagnosis of Kinetic Energy Balance of a Decaying Onland Typhoon

Diagnostic analysis of the balance of kinetic energy (KE) is made for a decaying onland typoon, its external tor-rential rain area and environment. Results show that, besides low-level frictional dissipation as an energy sink, upper-level horizontal export of KE is another important one for the typhoon. In its decaying KE grows in the exter-nal torrential rain area, and the KB production term Gk represents the chief energy source for the torrential rain. The growth of Gk is attributed to the development of the heavy rain and to the heating effect of released latent heat, and the external torrential rain owes its evolution to the exported KE from the strong windbelt in the east of the ty-phoon and the conversion of synoptic KE into mesoscale perturbation KE. The development of the torrential rain re-sults in the KE feedback to its environment. The KG transfer from toe typhoon to the external torrential rain area and then to the environmental region as a mechanism constitutes one of the causes for the rapid disintegration of the tempest.