Some characteristics of the average monsoon rainfall along the coasts of India and Burma

The rainfall during the southwest monsoon season of India and its neighbourhood is not uniformly distributed over the various stations along the coasts nor uniform throughout the season. With a view to study whether the pulsatory character is reflected on the average, a detailed study of the five-day normal rainfall is made for the stations located on the east arid west coasts of India and the Burma coast. From a preliminary study of the rainfall intensity and distribution, it is found that the stations can be classified broadly into six groups with subgroups in some of them. The groups and sub-groups are:- 1 (i) Tenasserim Coast, (ii) Arakan Coast; 2(i) Deltaic Burma Coast, (ii) Bengal and East Pakistan Coast; 3. Orissa Coast; 4(i) East Coast (North), (ii) East Coast (South); 5(i) West Coast (South), (ii) West Coast (North); 6. Kathiwar and West Pakistan Coast. The characteristics of the rainfall at the representative stations of these groups, as brought out by fitting orthogonal polynomials of the fifth degree, are discussed in the light of average synoptic climatology and topography.