TYPES. 



69 



The example selected and shown in Charts 6 and 7 took place 

 on September 28th and 29th, 1892; on the 28th (Chart 6), it 

 appears that one of these storms had developed in the previous 

 twenty-four hours, at the southern end of a narrow tropical or 

 monsoonal tongue of low pressure. An anticyclone of good energy 

 lies to the east of it, with its isobars extending well to the north 

 and contracting the width of the tongue in the north ; another 

 anticyclone lies to the west, and this also seems to be pressing on 

 the narrow monsoonal tongue and helping to contract its diameter, 

 at the same time the energy in both high pressures is adding force 

 to the circulation of the wind, and so aiding in the development 

 of the cyclonic circulation. A modified \ depression exists to the 

 south-east of the Australian Bight, and there is another over New 

 Zealand. 



TYPES 



AUSTRALIAN WEATHER 



N6 



Cyclone from Monsoonal 

 depression 6&7 * O 



On September 29th, (Chart 7), the small cyclone has extended 

 its area and energy on its way to the coast, but its motion of 

 rotation has been rapid, and this probably accounts in a measure 

 for the comparatively small area over which rain has fallen, 

 although, in this instance, over an inch of rain fell in the central 



