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Prevailing dry weather over peninsular India should give way for occasional rain to thundershowers from the weekend.
The ‘change agents’ are a persisting trough pressure along East Interior India; an incoming western disturbance from across the Northwest border; and a cloud band racing in to South from Bay of Bengal.
EASTERN TROUGH
The trough is headed by a zone of developing volatile and thundery weather over East and Northeast India. While running down along to South, it represents an area of lower pressure with ascending motion of air in which opposing winds (from land and sea) blow in and trigger instability.
The result is thundershowers and stormy weather. On Tuesday, the trough rain down from East Bihar to South Tamil Nadu across Chhattisgarh and Interior Andhra Pradesh.
In Northwest India, a prevailing western disturbance (another zone of lower pressure) hung over North Pakistan and adjoining Jammu and Kashmir.
The strength of the western disturbance has spawned an offspring i.e. a ‘baby’ cyclonic circulation, which lay over Punjab and adjoining Haryana.
India Meteorological Department (IMD) has forecast that a follow-up western disturbance would roll into the Northwest to shake up weather further over East and Northeast India.
Western disturbances travel from west to east and therefore touch off weather over East India and adjoining Northeast India. In the instant case, they are expected to busy up weather in the East and Northeast in what is a prelude to the seasonal thunderstorms, called ‘kal baisakhi.’
Meanwhile, in the South, a band of convective (rain-bearing) clouds is travelling north from the Equator and is headed for Sri Lanka and adjoining Peninsular South of India.
The cloudiness in the Bay has been generated by a cyclonic circulation over South Andaman Sea, which has been persisting there for a few days now.
BAY CLOUDS
This is what is promising to deliver some wet weather in the peninsula, in conjunction with the Bihar-to-Tamil Nadu trough and the western disturbances.
Kerala, Tamil Nadu and Karnataka are expected to variously benefit from the brewing weather over the South Peninsula.
This should offer some respite for the region, which has suffering from severe moisture stress and drought conditions for quite some time.
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