34 THE METEOROLOGY OF JAMAICA 



1880, were passing south of Jamaica when they turned north 

 and swept the island. 



(4) When a large cyclone has developed, it often happens 

 that a cyclonic depression makes its appearance and confuses 

 the indications. For instance, in September, 1883, a large 

 cyclone advanced through the Mona Passage on its course to 

 the United States, and at the same time a depression passed 

 south of Jamaica on a westerly course; and the Weather HcporU 

 contain a number of such cases. 



(5) The rules given above as to the rotation of the wind 

 and upper currents round the centre are more than useful as 

 generalizations ; but in forecasting they must be used with 

 the greatest caution, especially when the cyclone is at a 

 considerable distance. On the other hand, much more use can 

 be made of the barometer than in the temperate zones, where 

 the fluctuations are large, provided that every care be taken 

 in its management, as detailed in the first section. 



(6) Finally, there is a cyclonic feature often noticed in 

 Jamaica, of which we have seen no account given elsewhere 

 after a cyclone has passed and is moving away, it draws after 

 it our winds and clouds for one or two days. To whatever 

 cause this effect may be attributed, it is very useful in letting 

 us know in what direction the cyclone has gone. 



In conclusion, a list of the more important articles among 

 the Wcatlicr liejxrrts is added, to which the reader may refer 

 for further information than could be given in the above brief 

 summary of Jamaica Meteorology. 



