1903.] C Little- — On two remarkable rain-bursts in Bengal. 



39 



racter of the fall accompanying thunderstorms. It was continuously 

 falling throughout the period and that at a time, it may be observed, 

 when in ordinary weather temperature is rising with the advancing day. 



Table giving temperature changes at Alipore observatory in degrees 

 Fahrenheit. 





On June 30th. 



Approximate 

 normal. 



Difference. 



4 A.M. 



85°*2 



80°-7 



+ 4°5 



6 „ 



83'0 



8fl 



+ 19 



8 „ 



82-8 



835 



-07 



10 „ 



79-5 



86-2 



-6-7 



12 „ 



78-5 



87'5 



-90 



The last column of the Table shows the large change of tem- 

 perature "which occurred between 4 a.m. and noon on the 30th June at 

 Calcutta. It also shows indirectly how scanty, comparatively, would 

 have been the information if the record had been limited to what is 

 usually noted at 8 a.m. The temperature at that hour was practically 

 normal. 



Storm of August 11th. 



The Tables containing the information for the August disturbance 

 have been prepared in the same way as those for the preceding storm 

 and are given below in the same serial order for purposes of com- 

 parison. I stated in discussing the earlier storm that the pressure 

 changes give an imperfect indication of the line of advance of the wave 

 of change. From Tables I (b), II (6), V (6) and VI (b) it will be seen 

 that the fall of pressure began in North Bengal on August 9th, that 

 it extended southward over Bengal Proper and Orissa and westward as 

 far as the Punjab on the 10th ; and that while pressure Avas beginning 

 to recover in North-East India on the 11th it was still falling in the 

 United Provinces, the Punjab and Kashmir. The fall on the 11th, was 

 very rapid at Teheran ( 175") and Ispahan (*150"), showing that the 

 centre of the wave had passed westward beyond the Indian region. 

 The rapidity of this westerly movement is very little less than that 

 of the earlier disturbance, and would probably have eluded observation 

 if it had not been for the larger fall. The fall is first shown on the 9th 

 in the north-east, and within 48 hours has passed far beyond the western 

 boundary of India, The movement is also shown by the recovery. 



