Abstract
The behavior of cloud patterns portrayed on the ESSA 2 photographs after typhoons Doris (September 1966) and Winnie (August 1966) encountered the pre-existing stationary fronts in the vicinity of Japan is discussed in relation to the results of the analysis based on the previously proposed hypothesis on the transformation of typhoons (Sekioka, 1956a) : that a typhoon induces the formation of a new extratropical cyclone on the pre-existing front within the typhoon area producing a complex system of the typhoon and the cyclone. Some evidence is given in support of the validity of the hypothesis.
The field of 500mb relative vorticity is also investigated in regard to the movement of typhoon Doris and the formation of the new extratropical cyclone.
