1889.] 



and May 1888 in the Doah ami BoMlMand. 



157 



For 4 P.M., the hour nearest to those at which the storms occin'red, 

 the sea-level pressures and wind directions have been laid down on a 

 chart for each day, and the iisobaric lines have boon drawn for differeuocs 

 of -05 inch. On the charts for the 30th April and 1st May tho tornado 

 tracks are also shown. 



On tho 29th, there was apparently at 4 v. m. an anticyclonic area 

 over tho Nepal Himalaya and North Behai-, with an extension running 

 north-westwards over Northern Oiidh and the outer hills. The lowest 

 pressure was in the vicinity of Sirsa on the border of the western 

 desert, and a long V-shaped depression extended from it towards Agra 

 and Bundelkhand. An independent region of (hypothetical) low pres- 

 sure occupied the interior of Kumann and Garhwal. 



On the 30th, the pressure had fallen considerably in most places, but 

 risen at Chakrata and Simla, and the gradients between Simla and 

 Ludhiana were very steep. Tho lowest pressure was at Lahore, but a 

 succession of V-shaped isobai-s projected south-eastwards to Sntua. 

 The winds were light and somewhat irregular, though on the wholo 

 consistent with the distribution of pressure. The three storms whose 

 tracks are marked appear to have originated in or near the line of 

 lowest sea-level pressure and to have proceeded eastwards nearly at 

 right angles to the isobars, that is to say, up the slope of pressure, a 

 statement which appears somewhat paradoxical, seeing that the strongest 

 winds wore from the west, or in the same direction as the paths along 

 which the storms progressed. 



On the 1st May, there had been a considerable rise of pressure over 

 the whole region, especially over the hills of Kumaun and Garhwal. In 

 Dehra Dun the gradients producing S. E. or S. winds at low levels were 

 excessively steep, but over the rest of tho region thoy wore much tho 

 same as on the previous day. The line of lowest pressure indicated by 

 the vertices of the V-shaped isobars was however shifted a good deal 

 to the south, and now extended from the vicinity of Sirsa through 

 Alwar to Sutna. Over the Gangetic plain, the winds were light and 

 irregular, but, west and south of tho Jumna, they blew steadily in tho 

 directions indicated hy tho distribution of pressure. Both the storm 

 tracks shown lay well to tho north of the line of lowest pressure, and, 

 as on the 30th April, the storms progressed in opposition to tho baric 

 gradient, 



Oa the 2nd May, there were still steep gradients over tho Eastern 

 Punjab and' adjacent hills, but over Rajputana, the N.-W, Provinces, Oudh, 

 and Bohar tho pressure was neai-ly uniform, and tho two isobars shown 

 on these regions of the chart took peculiar and unusual courses. Tlio 

 anticyclone over North Bcliar and Noiial had disappeared, and the castor- 



