Discussion 



Colonel Moorman said that this dynamic climatology of the area 

 served mainly in training analysts and forecasters and the system of 

 descriptive weather types presented by Captain Best could not be used 

 entirely for daily forecasting activities. 



Mr. Priestley was interested to see that in the East x\sia area the 

 migratory anticyclones existed with period almost identical to that 

 in the southern hemisphere. He felt it would be useful if some work 

 were done on these anticyclones analogous to the work of Kidson in 

 the southern hemisphere. 



SELECTED ANALYSES FOR THE SOUTHERN OCEAN AND 



THEIR IMPLICATIONS IN SOUTHERN HEMISPHERE 



CIRCULATION 



By W. J. GiBBS, Austrahan Meteorological Service 



[Ahstract (i)] 



The establishment of meteorological observing points at Marion, 

 Heard, and Macquarie Islands has provided a unique opportunity for 

 the study of meteorological elements at these localities. Although 

 the distances separating the observations are great, the fact that frequent 

 reports are made and that radiosonde data are available makes possible 

 a generalized synoptic analysis of the Southern Ocean. These analyses 

 have important bearing on the analysis over the Australian Continent 

 modifying considerably some existing frontal concepts. The implications 

 of these analyses in the general circulation of the Southern Hemisphere 

 are briefly discussed. 



PREFERRED POSITIONS FOR CYCLOGENESIS IN THE 

 AUSTRALIAN AND TASMAN SEA AREA 



By J. W. LiLLYWHiTE, Austrahan Meteorological Service 



[A bstract] 



The effect on the general circulation over Australia in particular, 

 and the South Pacific Ocean generally, of secondary cyclones which 

 develop in mid-latitudes over and near the Australian mainland is 

 discussed, and the importance to forecasting of advance knowledge of 

 their development is emphasised. 



A statistical examination of fully analysed Australian synoptic 

 charts for two sample years shows that certain regions are " preferred 

 positions " for the formation of these secondary features of the circulation. 

 Neglecting the tropics, the most noteworthy regions are found to number 

 four — 



(1) An elongated area lying parallel to and one to two hundred 



miles inland from the west coast of Western Australia. 



(2) The " head " of the Great Australian Bight, approximately 



lat. 30° S. ; long. 130° E. 



(3) Waters within one to two hundred miles to the west, south, and 



south-east of Tasmania. 



(4) The central Tasman Sea, approximately one to three hundred 



miles south of Lord Howe Island. 



^The full paper is to be published in the " Weather Development and Research 

 Bulletin " of the Australian Meteorological Service, 



48 



