The Hindu Business Line : More rain from interacting systems seen

THE interaction between a tropical system (Bay of Bengal-generated) and an extra-tropical system (western disturbance) is only half way through when a successor system in the form of cyclonic circulation from the Bay has set itself off on a similar course.

The net result is that the prevailing wet weather in the regions of coastal Andhra Pradesh, Tamil Nadu and Pondicherry will get extended further in the short term, says an outlook provided by the National Centre for Medium range Weather Forecasting (NCMRWF).

The ongoing interaction of the westerly trough with the northeast monsoon system is expected to continue at least for the next two-three days, the zone now being marked out as an upper air cyclonic circulation over Bihar and adjoining areas.

Tuesday's upper air cyclonic circulation over south-central Bay of Bengal has moved in a northwesterly direction and is now located over the sea off the coast of Andhra Pradesh. The system is expected to get organised further and move in north-northeasterly direction slowly to come under the influence of the westerly trough lying over northeast India.

The supportive east-west oriented shear zone associated with the northeast monsoon is likely to remain active both over the Bay of Bengal and the Arabian Sea due to the presence of cyclonic circulations on either sides of peninsular India.

This scenario is expected to cause fairly widespread to widespread rainfall over coastal Andhra Pradesh, Tamil Nadu and Pondicherry and scattered to fairly widespread rains in remaining areas of south peninsular India, Lakshadweep, Andaman and Nicobar Islands, Chhattisgarh, Orissa, eastern parts of Bihar, Jharkhand, West Bengal and the Northeastern States.

During the 24 hours ending on Wednesday morning, the southern peninsular India, viz. Tamil Nadu, Andhra Pradesh, Karnataka and parts of Kerala and Gangetic West Bengal have received scattered to fairly widespread rains. In addition, parts of Konkan, Goa, Maharashtra, east Uttar Pradesh, east Madhya Pradesh, Chhattisgarh, Orissa, Jharkhand and the Northeastern States also received scattered rains during the period.

Due to the passage of western disturbance from the Jammu and Kashmir, a sharp decrease in night temperatures is expected over the next two-three days.

In its region-wise forecast, the NCMRWF said the entire south India may receive scattered to fairly widespread rains except in coastal Andhra Pradesh, Tamil Nadu, Pondicherry and Andaman and Nicobar Islands where it could be widespread with isolated heavy episodes during the next four days.

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