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Rain in Oct? Low pressure over sea at work

The city experienced heavy showers for the second consecutive evening on Tuesday.

mumbai Updated: Oct 20, 2010 01:12 IST
HT Correspondent

The city experienced heavy showers for the second consecutive evening on Tuesday.

“There is a low pressure area over the Arabian Sea, 70 km off Mumbai. As a result, there were strong north easterly winds blowing resulting in thunder activity,” said RV Sharma, deputy director general, western region, India Meterological Department. “This is a spell that will last only one hour. We will watch if the low pressure area will intensify.”

For the last 24 hours, there has been 2.9mm rainfall recorded in the city. Weathermen have predicted one or two spells of rain in some parts of the city with a maximum temperature of 32.4 degree Celsius.

While it may seem that monsoon is over, weathermen say there is still some time.

Though it’s easy to predict the onset with accuracy, withdrawal doesn’t follow the same pattern. Withdrawal of monsoon that starts from north India is declared only if there are five clear and hot days without rain over a larger area.

“At present, there is 60% to 70% humidity in the air. This means the accompanying moisture could bring about some rain spells,” said Sharma. “Only when humidity level comes down to 20% to 30%, the moisture will reduce and so will formation of clouds. We will only then declare that monsoon is withdrawing.”

This year, the city recorded a 50-year high in rainfall figures. Since June 1, it has rained 3167.7mm in Colaba, while Santacruz has received 3326.5mm. On August 17, Mumbai crossed the average annual rainfall of 2,294mm that stretched over four months.

Rail services on the harbour line between Panvel and Belapur stations were affected from 7pm to 8pm after lightening struck an insulator of the overhead equipment at Mansarovar station.