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The well-marked low-pressure area weakened another round to be reduced to a conventional low-pressure area last (Thursday) night itself and moved slightly northwest to southwest Uttar Pradesh and adjoining northwest Madhya Pradesh this morning.
Not just has age (more than week old now) caught up with the system but two rival storms in faraway Pacific too have hastened its weakening by spiriting away moisture feed from the Bay of Bengal.
Some of the outgoing moisture feed originating from upstream Arabian Sea will cut across the west coast forcing it to wring out some as rain along the west coast.
The rest will cruise along lower latitude to cross over into the Bay and further east into South China Sea/northwest Pacific.
The latter could even pop up a cyclonic circulation on impacting the rugged land features of northeast India and trigger a wet session over east and northeast India.
Some of these rains could propagate into east-central and adjoining central India as monsoon easterlies blow inland along the land-based monsoon trough.
A short-term forecast issued by India Meteorological Department (IMD) this morning said that fairly widespread rain or thundershowers would occur over West Bengal, Sikkim, the Northeastern States and the west coast until Monday.
Scattered rain or thundershowers may occur over northwest, central and the rest of east India today and increase thereafter. Isolated rain or thundershowers would occur over rest of the country.
Meanwhile, global forecasts are indicating rains along the west coast through the week-end, gaining in intensity as the Pacific storms peaks over. No gains are indicated in the interior since there is no help to look forward to from either the seas or the atmosphere.
An India Meteorological Department (IMD) update early on Friday morning said that satellite pictures show convective (rain-bearing) clouds over parts of west Rajasthan, Punjab and Himachal Pradesh left out to be covered by the monsoon as of now.
These clouds were also present over Goa, east and northeast India, north coastal Tamil Nadu, east-central and northeast Bay of Bengal and north Andaman Sea.
A weather warning for today said that isolated thunder squalls may roll out across Punjab, Haryana, Delhi, Rajasthan and west Uttar Pradesh.
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