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The easterly wave has arrived in style over the Sri Lankan and across the Gulf of Mannar along the Tamil Nadu coast, promptly throwing up an upper air cyclonic circulation.
This is now expected to descend to lower levels to set up a low-pressure area over the Comorin area over the next two days, an India Meteorological Department (IMD) outlook said.
HEAVY RAINS
The system would be perfectly positioned to drive in the moisture-laden southerlies to southeasterlies along the Sri Lankan and Tamil Nadu coasts.
Heavy rainfall has been forecast at one or two places over Tamil Nadu during the next two days, with overnight piloting rains having already fallen at many places.
The chief amounts of rainfall recorded during the 24 hours ending Thursday morning are (in cm): Atiranapattinam-6; Tondi-5; Cuddalore and Karaikal-3 each; Nagapattinam-2; and Chennai and Pamban-1 each.
Rainfall also occurred at many places over upstream Andaman and Nicobar Islands; at a few places over interior Tamil Nadu and at one or two places over Kerala.
BREAK-AWAY WHIRL
Meanwhile, an outlook of the US National Centres for Environmental Prediction suggested that the ‘low’ might send out a break-away circulation into southeast Arabian Sea.
This is seen as careening along the west coast, bringing rain over Kerala, Karnataka, Konkan and even Gujarat coasts during the next week.
Satellite cloud imagery on Thursday showed convective (rain-driving) clouds rising over parts of coastal Tamil Nadu, south Bay of Bengal, Andaman Sea, the Comorin area and south Arabian Sea.
MORE RAIN
A short-term outlook valid until Tuesday said that the weather-maker easterly wave would continue to affect the southern peninsula with rainfall activity at many places.
Rain or thundershowers would break out at many places over Tamil Nadu on Friday and scale up thereafter.
A similar forecast is valid for a few places over Kerala, south interior Karnataka, south coastal Andhra Pradesh, Rayalaseema and Lakshadweep.
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