240 C. Little — Himalayan summer storms. [No. 4, 



The two storms of 1902 regarding which I gave details in the paper 

 read on April 1st were rapid in their advance aud widespread, so that 

 within a few days their influence was felt along almost the whole 

 length of the Himalayas. 



The storms of the present season have been slower in their move- 

 ment and of limited extent, so that their influence has been confined to 

 sections of Northern India, the latest occurring only a few days ago when 

 the unexpected rainburst in the United Provinces produced so important 

 a change on the agricultural outlook in that region. 



It is not my intention to give details of all these three disturbances, 

 but the middle one of the three is so important, in my opinion, inasmuch 

 as it confirms a conclusion I came to last year after the disturb- 

 ance of August 11th. That conclusion was that these Himalayan 

 disturbances not only have an influence on the motion of cyclonic storms 

 which cross Northern India from the Bay of Bengal, but they directly 

 contribute to their commencement. The Himalayan storm which 

 entered north-east India on July 8th or 9th, 1903, is in its main features 

 so similar to the storm of June 30th, 1902, and it resembled the storm of 

 August 11th, 1902, in that it was followed by a remarkable series of 

 cyclonic storms over the north of the Bay. Because of these similarities 

 I think it desirable to give tabular statements for it, similar for purposes 

 of comparison with the tables I gave in my previous paper. It will be 

 seen from these tables that pressure began to fall on the 7 th in the ex- 

 treme north-east of Assam, that this fall was general along the 

 Himalayan range on the 8th and 9th and was followed by a rise on the 

 10th. As these changes extended south-westward over Bengal, rainfall 

 with a rapid fall of temperature became more general— between the 9th 

 and 10th in North and East Bengal and between the 10th and 11th in 

 the western districts. The small charts which are given in the Indian 

 Daily Weather Report, one for the " variation of 8 a.m. pressure of day 

 from normal," and the other " variation of mean temperature of day 

 from normal," show more clearly than the tables the succession of 

 changes which passed over Northern India with that Himalayan storm. 

 The dates for which reference to these charts is suggested are from July 

 7th to 14th. An examination of the pressure charts will show that 

 pressure was normal along the Himalayas on the 7th and practically over 

 the whole of India. Two days later it was low over Northern India, but 

 still practically normal over the continent. This low pressure area was 

 displaced southward, and by the 13th we have pressure again normal 

 over Northern India and low over the continent ; while one depression 

 has formed over the north of the Bay and another in the north-east of 

 the Arabian Sea. 



