Dear SSET,
Have you ever compared this year TN rainfall with TN NEM normal rainfall. For your information upto 29.11.2009 TN has received 10% above NORMAL rainfall for this NEM season. That too the rainfall is wide spread baring few NW interior districts.
EL NINO Southern Oscillation [ENSO] is one of tele- connections our NEM is having. Some times it is very prominent; some time its in significant. There is no reduction in the number of rainy days for TN. But upper air at 925 hPa to 850 hPa level is relatively warmer in most part of the year.This anomaly is to be studied.
Further I will let you know in appropriate time when bad weather related to this phenomenon is occurring.
---------- More about coming up showers --------------
NE winds brought rain in many parts of Tiruvarur district and selected coastal locations in Nagai, Ramanad, and Pudukottai districts. [29.11.2009/0830 hrs IST].
Now NE winds of the order 10 to 15 knots are blowing from NE direction from surface to 850 hPa. This may bring smaller showers to day in Puducherry, coastal Villupuram and Kanchipuram districts. However the High pressure hovered over central India at 850 hPa is prohibiting clouds developments
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