The last few days have seen most of Tamil Nadu blanket under a cool spell which has seen the night time temperatures drop well below normal in many places over North Tamil Nadu. Places like Chennai & Pondicherry recorded their lowest temperatures in nearly two years as Nungambakkam recorded its first sub 20°C since December 2016. This spell of Cool Nights is expected to take a small break with the possible return of rains over Coastal Tamil Nadu starting tomorrow.
While overall conditions in North Indian Ocean is not very conducive for the Low Pressure Area in Bay of Bengal to develop into a strong system it could certainly bring in some rains over coastal areas for the next 3 / 4 days as it shifts west towards Tamil Nadu coast. The satellite image shows why its best to keep expectations low and enjoy what ever rains we will get out of this system. Additionally right through its life cycle we can expect the disturbance to be influenced by Dry Continental Air limiting its scope & development.
Numerical Models indicate the stretch between Rameswaram & Puducherry to be best placed for the upcoming spell of rains. As indicated in our post a couple of days back there could be some places in this stretch that could record thunderstorms at times on account of wind convergence as the Low Pressure moves closer to the coast in a weakened form.
While chance for rains in Chennai do exist it is unlikely to be heavy and widespread so let us take what ever comes our way before another spell of dry & cool weather await us.