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Comparison of the values of columns 4 and 5 of Table I shows that a cyclone of radius r0 = 1000 Km is translated to the west due to the variation of the Coriolis parameter, approximately at the rate of 1.5 m/sec; for ro = 500 Km a t the rate of 0.4 m/sec; for Y, = 350 Km at 0.2 m/sec; and for yo = 200 Km a t 0.1 m/sec. If we consider that the effective radius of our vortex model is practically 0.7 Y, we conclude that in a hurricane of effective radius of 700 Km embedded in an easterly flow of 5 m/sec, the 8term contributes 23 % of the easterly translation of the hurricane, while for effective radius of 350 Km and 140Km, its contribution is of 7 % and 4 %, respectively.
The northward translation of the cyclone, due to the variation of the Coriolis parameter that is given in column 6 of Table I, contains t a as factor and therefore cannot easily be compared with the translationdue to the meridional flow which contains only t as factor.
From the values of column 6 and its comparison with column 4 it is clear that the importance of this term increases when we deal with cyclones with a large radius and strongwind velocities.
When the meridional component of the flow is zero (B = 0)the j3t2term is the only one responsible for the northward displacement of tropical cyclones (in the Northern Hemisphere).
Besides the 8t2term, the computation of J2y/2t2yields additional terms in solution (5) of the form