It is suggested that an important mechanism contributing to oceanic cyclone development is the exchange of sensible and latent heat from the ocean to the atmosphere during periods of strong outbreak of cold continental air. Rapid oceanic development frequently occurs off the east coasts of continents in winter but is also periodically observed elsewhere, such as in the Gulf of Alaska. One case of explosive cyclone deepening in the Gulf of Alaska occurred in February 1950. This case, studied from the standpoints of barotropic deepening, atmospheric heating, air-sea exchange, and the cyclone models of Petterssen, is compared to other cases of similar development, particularly with respect to the importance of air-sea interaction in the growth of these storms.

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