The rainfall activities have once again intensified in Tamil Nadu. As predicted by Skymet Weather, light to moderate rain with one or two heavy spells lashed many parts of the state, wherein Cuddalore recorded 61 mm of rain in a span of 24 hours from 8:30 am on Monday. The intensity, however, remained light in the capital city of Chennai with Nungambakkam observing only 3 mm of rain during the same span.
According to our meteorologists, the easterly wave has become active and Northeast Monsoon is also normal over the state. As a result, scattered showers would keep appearing for another three to four days. Chennai would record patchy light rain with one or two odd intense spells during this span. Thereafter, the intensity may reduce, however, on and off showers would continue.
October ended on a good note for Tamil Nadu in terms of rainfall activities. By the end of the month, the state was standing rain surplus by 27% (October 1 to 31). However, November started on a rather poor note and the first thirteen days were almost dry. In the absence of any significant showers, surplus was completely consumed and the state incurred a rain deficit of 6% as of November 17 (October 1 to November 17).
Except for the last few days, Northeast Monsoon had been subdued in Tamil Nadu since the beginning of November. And the formation of weather systems, be it a Low-Pressure Area, Depression or Cyclone needs to be blamed for such conditions. Whenever these systems develop, the intensity of north-easterlies reduces and the winds lack strength so as to activate Monsoon and hence result in subdued conditions.
Now, as all these systems have faded away, the flow of northeasterly winds has resumed and thus Northeast Monsoon has become normal from subdued and been giving good showers since the last two days.
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Any information taken from here should be credited to Skymet Weather