Friday, May 29, 2009

Mild Chennai summer till 20-May-09

As the khatri veyyil' ends, Chennaiites can heave a sigh of relief. May, traditionally the hottest month, has been comparatively pleasant.

Reason? The sea breeze blew in early enough to contain the heat radiation. Unlike in the previous two years, the mercury touched 40 degrees Celsius only on four days this year. In 2007, it climbed over 40 C on 12 days, and last year it touched 40 and above on 16 days. The pleasanter weather

has come in a year when summer showers have been deficient. According to the Met department, Nungambakkam recorded 17 mm of rain between March and May while Meenambakkam was deficient by 42 mm, as against the normal 79 mm.

"The timely onset of the sea breeze has kept the temperature under control, since clear skies and sea breeze control heat radiation," said Y E A Raj, deputy director-general of meteorology, Regional Meteorological

Centre (RMC). "When the sea breeze sets in, the day temperature will drop by two or three degrees in one hour, and since they blow for 12 hours a day in May, the weather will be pleasanter," he added. According to him, strong westerly winds will impede the onset of sea breeze, and make the temperature warmer. Barring on May 13, 14, 23, and 25, the arrival of sea breeze has been close to normal. In May 1910 and in May 2003, Chennai recorded 45 degrees Celsius.

According to RMC director S R Ramanan, "A low pressure blocked a good part of the solar radiation and aided in maintaining comfortable levels this May."

A Ramachandran, director, Centre for Climate Change and Adaptation, Anna University, pointed to a 0.2 degree rise in the mean value of day temperatures during the khatri over the last two decades. According to him, man-made causes are likely to impact radiation levels in future

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