68 



AUSTRALIAN WEATHER. 



ion was a considerably less active feature, but on the other hand 

 the monsoonal dip was somewhat more pronounced, and possessed 

 two instead of one isobar. Following the 19th, the chart of 20th 

 revealed no sign of the monsoonal tongue, and the continent was 

 covered with a high pressure of very slight energy. 



TYPE III. DEVELOPMENT OP A CYCLONIC STORM IN LOW LATITUDES 

 FROM A MONSOONAL DEPRESSION. 



In Type No. 3 we have the development of a cyclonic storm 

 out of a monsoonal depression. The seasonal peculiarity of this 

 phase of the tropical low pressure is similar to that in Type No. 2. 

 The cyclone seems to develop when the southern extension of the 

 monsoon is out of proportion to its width, and it becomes so 

 narrow at one part of it that the opposing winds which circulate 

 round it interfere, set up the cyclonic circulation, and it then 

 progresses eastward as a rain storm. (See Charts 6 and 7.) 



These storms frequently develop in South-east Queensland, 

 and they are generally most severe there ; the quantity of rain 

 which sometimes comes with them is very remarkable, as in the 

 case of the phenomenal flood in Brisbane in 1893, which was the 

 result of one of these storms. 



