Southwest Monsoon active in West Coast, Possible lean day in East

Southwest Monsoon that saw a delayed onset over Maharashtra is trying to make up for lost time as places in Konkan & Goa coasts have received heavy rains last night.  Dapoli, in Ratnagiri district, about 200 kms to the South of Mumbai has recorded about 19 cms rainfall till 4:30 in the morning.  The heaviest rains have been seen between Mumbai & Goa while one or two places in Karnataka also have seen heavy rains like Honawar etc.

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This situation is expected to continue for the next couple of days as Coastal Maharashtra is likely to see possibly its first widespread heavy rains episode in the coming day or two.  Wet weekend is likely for places like Mumbai under the active monsoon surge.  Today we are likely to see heavy rains continue in Coastal Karnataka & the Konkan region of Maharashtra & Goa.  As the weekend approaches the rain bands are expected to move slightly North leading to a wet weekend for Mumbai.

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With very active Southwest Monsoon in the West Coast normally the East Coast sees lesser rainfall though the Upper Air Cyclonic Circulation does exist in the Bay which could alter the equations.  Going by model inference though it is likely we could see some isolated rains in Tamil Nadu around Pondicherry & Delta regions as these areas fall in the right angle for the UAC to make an impact.

While not ruling out rains for rest of North Tamil Nadu it is likely we could end up with only cloudy skies and a pleasant day right through the day for places like Chennai.  It would not be a surprise if Chennai once again ends with a day time maximum temperature of around 30 / 31 degrees today as well. The rainfall prospects for Chennai could improve if the UAC which some  models expect to descend to surface level moves up North towards Coastal AP