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11<br />
The strength of northeast monsoon over land areas is also described only in<br />
terms of rainfall as in the case of the southwest monsoon and the specifications<br />
for the same are given in Appendix I.<br />
7.2 It will be seen from the table, that the monsoon activity (vigorous,<br />
active and normal) over south Peninsula as a whole is a maximum in October. By<br />
<strong>No</strong>vember, it rapidly decreases, except in Tamil Nadu where it continues in<br />
December also. Coastal Andhra Pradesh, Rayalaseema and South Interior Mysore<br />
are predominantly dry in <strong>No</strong>vember and December. Even in Tamil Nadu, dry days<br />
are considerably more in December (nearly 50%) than in <strong>No</strong>vember (about 25%).<br />
the<br />
Except along the east coast — in sub-divisions of Tamil Nadu and Coastal Andhra<br />
Pradesh - vigorous monsoon is very rare; in Coastal Andhra Pradesh, active to<br />
vigorous monsoon is mainly in October and decreases rapidly thereafter. In<br />
Tamil Nadu, however, it continues in <strong>No</strong>vember and December also.<br />
7.3 It is a point of interest to note that while along the west coast,<br />
active to vigorous monsoon conditions occur on 20/6 to 25% of the occasions at<br />
the height of the southwest monsoon season, along the east coast during the<br />
northeast monsoon, the corresponding figure is only about 15%.<br />
8. Sea Level Pressure<br />
8.1 The sea level pressure distribution during this season is characterised<br />
by a low in central Arabian Sea and central Bay connected across the Peninsula<br />
by a trough. A dumb—bell shaped isobar connecting the two lows over the sea<br />
areas is characteristics of the mid—season. When we examine the pentad mean sea<br />
level isobaric charts, we find a gradual southward progression of the dumb—bell<br />
shaped trough system through nearly 10 degrees of lat. during the months of,<br />
October and <strong>No</strong>vember. By end of <strong>No</strong>vember or beginning of December, the seasonal<br />
trough shifts to the south of the Indian Peninsula and isobars become almost<br />
east-west with minor trough patterns off the east and west coasts. Even after<br />
the seasonal trough had shifted well to the south of Indian Peninsula, it may
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