It is that time of the year when weather bloggers across South India, particularly Tamil Nadu start behaving like Dads pacing themselves outside labor ward as he waits for his child to be born. Yes every year just before the onset of Northeast Monsoon there is a sense of expectation / butterflies in the stomach moment for weather bloggers as the window of Onset comes to within the next 24 to 48 hours. Tension builds as a lot of thoughts get into the minds about the intensity of onset, how would it compare to past onsets.
The satellite image indicates Northeast Monsoon may not be far away with Easterlies strengthening under the influence of an upper air cyclonic circulation seen over Bay of Bengal. The early morning high decibel action that hit Chennai & suburbs on Monday is a confirmation the Onset is a matter of another 24 hours or so. The wind charts show the reason for the high decibel action in the form of a wind convergence over coastal areas of Tamil Nadu.
The UAC seen over Bay of Bengal has indeed to a great extent streamlined & strengthened the Easterlies compared to say 36 hours back. With weather models consistent on the circulation drifting west as it prevails coming closer to the coast of Tamil Nadu the Easterlies will further strengthen & the rains are expected to increase when the circulation comes closer.
In the meanwhile today many places in South TN & West Interior TN may see moderate spell of rains while few places could see heavy spell of rains accompanied by lightning & thunder. Due to the wind convergence there is a chance for one or two places in coastal TN stretch between Pulicat & Marakkanam to come under intense thunderstorms during the afternoon / evening hours while Chennai & suburbs may see light to moderate rains in a few places.
All in All சென்னையில் ஒரு மழைக்காலம் இனிதாக துவங்க இருக்கிறது. Happy Monsooning.