Isohyetal Patterns over South India in relation to the locations of various Storms/depressions of the Bay striking east peninsular coast during Post monsoon season

Abstract

In this paper, a study has been made of the isohyetal patterns over South India during the post-monsoon season in relation to the position and movement of Bay storms/depressions. The above disturbances have been classified into three categories, viz. , A, p and C according to their crossing the coast south of Cuddalore, between Cuddalore and Ongole, and between between Ongole and Cahngapatnam respectively. The positions of the disturbances in the various 2-degree square in the Bay and the corresponding mean isohyetal patterns over South India during the subsequent 24 hours are shown diagrammatically for all the three categories. These diagrams may be of use to forecasters in issuing heavy rainfall warnings for the next 24 hours in association with the Bay disturbances during monsoon season.