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23<br />
TABLE - V*<br />
Monthly frequency of Cyclonic Storms and Depressions<br />
- in the 70 year period 1891-1960<br />
Oct. <strong>No</strong>v. Dec.<br />
Bay<br />
Storms 53 56 26<br />
Depressions 56 32 18<br />
Arabian Sea<br />
Storms 17 21 3<br />
Depressions 11 10 5<br />
* (From "Tracks of Storms and Depressions in the Bay of Bengal and the<br />
Arabian Sea - 1877-1960". India Met. Department, 1964).<br />
The table shows that while in October, storms and depressions are nearly equal<br />
in number, storms are more numerous than depressions in <strong>No</strong>vember and December.<br />
12.1.4 The characteristic features of rainfall associated with storms<br />
and depressions during this season are,<br />
i) heavy to very heavy heavy rainfall along the coast and its decrease inland<br />
ii) a considerably large extension of rainfall to the north of the centre<br />
than to the south. On the northern side, rainfall may extend over a distance<br />
as much as 10 degrees latitude from the centre of the storm/<br />
depression, while on the southern side, it extends hardly a few degrees.<br />
On the southern side the gradient of isohyets is very steep.<br />
iii) Heavy to very heavy rainfall occurs close to and to the north of the track.<br />
In typical cases the area of heavy rainfall in the north extends upto<br />
about 4-6 latitude from the centre of storm (or depression) while in the<br />
south it may be hardly about one degree of lat. or so. This is in contrast<br />
to the distribution in the southwest monsoon season when rainfall is<br />
mainly to the south of the depression track. Two typical days' isohytal<br />
charts showing the distribution of rainfall over the Peninsula in association<br />
with two cyclonic storms are given in Fig. 12.1(a) and (b).
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