Heavy rains in coastal Andhra Pradesh due to distant effect of storm / depression in southwest Bay

Abstract

Coastal Andhra Pradesh (CAP) gets heavy to very heavy rainfall -sometimes leading to floods when a storm/depression in southwest Bay crosses Tamil Nadu coast south of Madras latitude during October and November. This interesting fact is difficult to visualise from the synoptic study though it is very useful for forecasting purposes. This effect can be called as distant effect of the storm/depression. This distant effect is observed in six case studies and the mechanism for such an effect is explained by calculating field of divergence. It is also found that 'distant effect' is only applicable to the storms of October and those occurring in the first fortnight of November. Two storms studied here, one in the second fortnight of November, and other in the first week of December do not completely follow this 'distant effect'.