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Opening monsoon `pulse' fizzles out

Vinson Kurian

Thiruvananthapuram , June 8

THE inaugural monsoon `pulse' has been declared dead, with seasonal moisture-carrying winds from the sea failing to measure up for the second day running on Wednesday.

Dr A.B. Majumdar, Deputy Director-General, India Meteorological Department (IMD), Pune, told Business Line that the rain activity associated with the first spell or `pulse', had come to an end. The second pulse would take at least a day or two to materialise, he said.

According to Mr M.D. Ramachandran, Director, Met Office, Thiruvananthapuram, synoptic conditions favouring the formation of helpful atmospheric disturbances such as low-pressure areas and depressions were conspicuous by their absence. The `pull effect' associated with these systems is capable of revving the dormant monsoon system to life.

Satellite pictures on Wednesday showed the starkly contrasting stages of the monsoon systems of the Arabian Sea and the Bay of Bengal. While cloud formation was weak on the southwest (Arabian Sea), the far southeast (Bay of Bengal) was humming with rain activity. A huge cloud mass extending up to the South China Sea had masked much of the Bay from view.

Wind speeds were confined within the 15-knot level, Mr Ramachandran said. This is way below what is required to sweep the moisture across the coast and drive it up against the orography to produce rain. Rainfall was weak and limited to a few places in Kerala, Coastal and North Interior Karnataka.

"The IMD had warned fishermen yesterday that winds could reach 25 knots over the islands. Even this failed to happen," Mr Ramachandran said. However, the humidity feed was adequate throughout.

Meanwhile, the routine IMD weather update said the southwest monsoon had advanced over more parts of East Central Arabian Sea, the Union Territory of Goa, entire Coastal Karnataka, most parts of South Interior Karnataka, Tamil Nadu, parts of Rayalaseema and Coastal Andhra Pradesh, entire Southwest Bay and parts of the Central Bay. The northern limit of the monsoon passed through Panjim, Chitradurga, Anantpur and Kaveli.

The trough at sea level lay off the South Konkan-Kerala coast. The cyclonic circulation was positioned over North Interior Karnataka.

On Thursday, rain/thundershowers are likely at many places over Andaman and Nicobar Islands, Lakshadweep and Coastal Karnataka and at a few places in Kerala, interior Karnataka, South Coastal Andhra Pradesh, South Konkan and Goa. Current rainfall activity over Coastal Karnataka, Kerala and Lakshadweep is likely to continue.

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