Tuesday, May 24, 2011

Monsoon delayed in Andamans

PUNE: The southwest monsoon has not kept its date with the Andamans yet but the Met department maintains that is no cause for concern. The monsoon normally reaches the Andamans around May 20, but this time the weather conditions there are not yet favourable for the rain-laden winds.

But all that can change swiftly and the monsoon could arrive in the Andamans as early as Thursday, say India Meteorological Department officials.

"Though there is a delay... this will not affect the arrival of monsoon in Kerala. The monsoon can reach both places on the same day. We still see the monsoon hitting Kerala on time, that is, on May 31," said P C S Rao, director (weather central), IMD.

Though rains hitting Andamans around May 20 is taken as a good omen, the monsoon is officially declared to have arrived in India when it hits the Kerala coast.

India Meteorological Department officials said the monsoon's arrival over the Andamans can be announced only if specific weather factors develop there – cloudy conditions and a particular wind speed. "These conditions are not present in the Andamans right now. There is not enough pre-monsoon rainfall in that region," P C S Rao, director (weather central), said.

A westerly trough in the southern parts of the country has been preventing the formation of rain-bearing deep convective clouds, which has delayed the arrival of the monsoon in the Andamans, says J R Kulkarni, senior scientist at the Indian Institute of Tropical Meteorology (IITM) here. "These clouds develop just before the monsoon. However, the trough is posing a hurdle to the formation of these clouds. It is difficult to say when the impact of the trough will reduce but it is likely it will happen in the next few days," he said.

The onset of southwest monsoon over Kerala heralds the beginning of rainy season in the Indian subcontinent. From 2005 onwards, the IMD has been issuing operational forecasts for the onset of the monsoon over Kerala using an indigenously developed statistical model with an error of plus or minus four days.

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