Except for a brief period during Cyclone Maarutha Chennai has so far escaped any major heat wave type of conditions this year with extreme heat so far not to be seen. Yesterday saw both Meenambakkam & Nungambakkam record their hottest days in almost a month with Meenambakkam almost touching 40°C once again. Going by how numerical models are indicating we are likely to see heat remain for the rest of the month.
Temperature anomaly charts indicate almost all of Tamil Nadu to be under hotter than normal conditions with possibly small pockets in the Western Ghats & Nilgiris possibly seeing closer to normal temperatures today. The North Tamil Nadu districts of Vellore, Kanchipuram & Tiruvannamalai along with parts of Villupuram could possibly bear the brunt of the heat attack with all these districts likely to see temperatures in excess of 40 / 41°C in most places with few places in line to once again touch 42 / 43°C.
A closer inspection of the model data indicates Chennai & suburbs could be in line for some intense heat spell during the afternoon under the influence of the strong Westerlies which is shaping up thanks to the progress of sub continental weather towards Southwest Monsoon with parts of Andaman & Nicobar Islands seeing the advent of Monsoon yesterday.
In particular the Western suburbs of Chennai is likely to see no respite from the Easterly sea breeze making it furnace like conditions till late in the afternoon with temperatures expected to stay close to 40°C in some of these places even at around 4 / 5:00 PM
On the rain front under the influence of the trough dipping from Marathwada till South Tamil Nadu parts of South Interior Karnataka & Kerala are in line for some moderate to heavy spells of rains while parts of adjoining North west Interior TN could also receive a spell or two of rains. Similarly in South TN places closer to Western Ghats and parts of Dindigul & Madurai district could also see spells of evening thunderstorms.