72 



AUSTRALIAN WKATIIER. 



In Chart 9, the western anticyclone has extended northwards 

 and has seriously contracted the diameter of the monsoonal low 

 pressure, thereby facilitating or helping to cut off and start the 

 cyclonic storm in the south ; which has now developed a much 

 steeper barometric grade and an energetic wind circulation, and 

 is moving eastward without extending the rain area. 



Chart No. 10 shows comparatively little motion in the cyclone, 

 but it is considerably distorted, especially to the west, where the 

 anticyclone is compressing the isobars by its easterly progress and 

 in its endeavours to maintain its rate has overridden the cyclone 

 in the north. As will be seen by a glance at these three charts, 

 the rain resulting from this storm was most extensive and bene- 

 licial, and the winds under its influences were strong. 



TYPES 

 or 



AUSTRALIAN WEATHER 



MiO 

 AfJf/JL 17, ie. 



TYPE V. CONDITIONS FAVORABLE FOR THUNDERSTORMS. 



Upon comparison of charts setting forth this type with those 

 of cyclonic thunderstorms, they will be found very similar ; the 

 main difference being the absence in this set of the cyclonic area 

 at the end of the monsoonal tongue. The chief feature indicating 



