TYPES. 87 



At 9 a.m. on the 24th, (Chart 26) the cyclone was still in an 

 active state, but it had passed to the south of Sydney and was 

 receding from the coast; the barometers were rising rapidly on shore, 

 and before noon a light northerly wind was blowing. On the 25th 

 September, the day following the gale, the weather everywhere 

 was generally fine, while all that remained of the energetic high 

 and low pressure systems were parallel isobars lying over the 

 southern areas of Australia with very shallow gradients. This 

 gale was very destructive and did much damage to property in 

 Sydney ; in some instances houses were unroofed, and the wind 

 and sea on the coast were very heavy. 



TYPE XII. DEVELOPMENT OF A CYCLONE FROM A A DEPRESSION. 



The distinction between a \ depression and a mqnsoonal low 

 pressure is not by any means well defined, and it is possible that 

 this should be taken as a variation of Type 3; there are however, 

 marked differences, not only in the shape of the isobars, but also 

 in the wind ; and the most decided distinction is perhaps the 

 easterly wind circulating round the southern part of the monsoonal 

 low pressure and the northerly and southerly winds about the \ ; 

 but in some cases, as in the one selected, the wind circulation is 

 mixed, northerly, southerly and easterly winds being present, and 

 these from their want of energy tend to throw the forecaster off 

 his guard. The season is, however, some guide, as these storms 

 are most frequent from September to April. 



Their sphere of influence is very extensive, as may be noted in 

 Chart 28, which shows rain over half Australia as the apparent 

 result of this storm. Most of these storms take a direct easterly 

 course over New South Wales and Victoria or through Bass* 

 Straits. At times they move to north-east, the Polar winds being 

 more energetic, and this feature intensifies all the storm and rain 

 conditions. The winds in all these storms are violent, and in 

 some very destructive. 



The one selected for illustration appeared first on 27th May, 

 1893, (Chart 27). At 9 a.m. on that day, a dormant and irregular 



