Chennai suburbs got more rain than core areas | Chennai News – Times of India

CHENNAI: With much of the convective activity taking place away from the coast into the land, suburbs have recorded excess rainfall so far this season than the city core localities. According to IMD, Meenambakkam has registered 142.7mm rainfall with an excess of 20.8mm rainfall between June 1 and July 14, while Nungambakkam recorded 105.8mm with a 5mm deficit during the same time. Nevertheless, the rainfall in the city and the neighbourhoods has pushed the overall rainfall numbers in Chennai subdivision to 114.4mm so far this June-September, with only 1% deficit. Meteorologists and bloggers said the city is likely to surpass the deficit and the month may end with surplus rainfall as the weather models show high probability of thunderstorms in the coming days.
N Puviarasan, director, Area Cyclone Warning Centre, IMD, said one of the reasons for Chennai suburbs and neighbouring districts Kancheepuram and Tiruvallur recording excess rainfall was due to the weak westerlies during the break monsoon season allowing the entry of easterly winds, which brought moisture into the land. This led to wind convergence and convection a few kilometres into the land. “They are not your typical monsoon rainfall. They are thunderstorms that won’t be widespread and cannot be accurately forecast without a dense network of observatories with real time and reliable data. There will always be spatial variability in the rainfall,” he said. “For instance, it may not be raining in Nungambakkam station, but a neighbouring locality could see some spells which the station may not be able to capture,” he added.
With the southwest monsoon picking up pace in the west of India, the past few days have been bringing evening spells in most parts of the city due to the strong westerlies bringing moisture up to the coast. The city, warm from the day’s temperature, adds strength to the moisture leading to formation of rain clouds and rainfall. On Wednesday too, many parts of the city recorded sudden evening spells.
The rain prospects for the rest of the month look bright. Blogger Pradeep John said there may be a high probability of rainfall on July 17 and 18, chances for scattered evening spells thereafter are good. “Wednesday’s spells may leave an excess in the city. For the rest of the month, day temperatures may be around normal and we can expect some spells every other day,” he said.


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