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Abstract
The displacement and intensity changes of a cyclone and anticyclone over the Northeastern Atlantic in October 1945 are investigated. An attempt is made to explain the motion of the cells as an analogue to the vortex pair in hydrodynamics. The observed paths and translational velocities are compared with those computed from theoretical relationships derived on simplifying assumptions involving a.o. conservation of absolute vorticity and an hypothesis of equivalent vortex strength. With reference to the third day after the genesis of the system, the result of this comparison is satisfactory and is considered significant in view of a concurrent transient reduction of horizontal divergence inferred from observed variations in the thermal structure of the cyclone.
The genesis and behaviour of the system of vortices is also discussed in relation to a recent theory of composite baroclinic vortices. In part this theory is confirmed by observational evidence as e.g. an accelerated equatorward drift of the cyclone in its early stage and an intensification of its upper part in a later stage when the centre of the system of vortices is stationary.