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-ogies in these geographically diverse phenomena-theoperationally important cloud belts that are found in alllatitudes but which are popularly termed "fronts" inhigher latitudes only. Those whc have had occasion touse st.reamline analysis in 01 mat,ional weather forecastingknow that theoretical lines oi just such logarithmic spiralshape are a kinematic necessity in such analysis of anyLow, tropical or otherwise, and also that pressure analysisis fundamentally incapable of delineating these singularlines

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RICHARD L. LIVINGSTON

. 2, Cambridge UniversityPress, England, Jan. 1968, pp. 209-248.Roberts, Walter Orr, "We're Doing Something About the Weather!,"National Geographic, Vol. 141, No. 4, Apr. 1972, pp. 518-555.Simpson, J. E., "A Comparison Between Laboratory and Atmos-pheric Density Currents," Quarterly Journal of the Royal Meieor-vlogical Society, Vol. 95, No. 406, London, England, Oct. 1969,Stewart, Homer J., "Kinematics and Dynamics of Fluid Flow,"Handbook of Meteorology, McCraw-Hill Book Co., Inc., NewYork, N

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Eric A. Hendricks, Brian D. McNoldy, and Wayne H. Schubert

. , W. H. Schubert , R. K. Taft , H. Wang , and J. P. Kossin , 2009 : Life cycles of hurricane-like vorticity rings . J. Atmos. Sci. , 66 , 705 – 722 . Hendricks , E. A. , M. S. Peng , B. Fu , and T. Li , 2010 : Quantifying environmental control on tropical cyclone intensity change . Mon. Wea. Rev. , 138 , 3243 – 3271 . Kossin , J. P. , and M. D. Eastin , 2001 : Two distinct regimes in the kinematic and thermodynamic structure of the hurricane eye and eyewall

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Ernani de Lima Nascimento, Gerhard Held, and Ana Maria Gomes

this context, we shall now turn our attention to the analysis of the kinematic fields. Figure 11a illustrates 850-hPa geopotential height and wind fields. The developing extratropical cyclone over the southern coast of Brazil is evident, with strong northwesterly and northerly flow over the warm sector to the north and east of the cyclone. This wind pattern was entirely within the region of high moisture content ( Fig. 10d ), highlighting the relevant role played by the lower-tropospheric flow in

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