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The prevailing easterly wave has tossed up an upper air cyclonic circulation over central parts of south Bay of Bengal early on Friday morning.
The other weather-maker system was the upper air cyclonic circulation over northeast India left behind by a previous western disturbance exiting the country.
This system that has been persisting over Assam and adjoining Arunachal Pradesh from overnight on Friday evening, an India Meteorological Department (IMD) said.
Satellite pictures mainly revealed the presence of convective (rain-bearing) clouds over parts of east-central and south Bay of Bengal and Andaman Sea.
Global models showed the upper cyclonic circulation over south Bay of Bengal steering a chunk of the clouding towards Sri Lanka and adjoining southeastern Tamil Nadu and Kerala.
Most of them, however, are repelled by the westerly flows from northwest India to blow north-northeast over the Bay of Bengal and away from mainland India.
COOL NORTHWEST
The IMD has hinted at the possibility of parts of the south peninsula receiving some showers during over the next couple of days.
Meanwhile, minimum temperatures fell below normal by 2 to 4 deg Celsius over parts of Rajasthan, Gujarat, Maharashtra and Tamil Nadu during the 24 hours ending Friday evening.
But they were above normal by 2 to 3 deg Celsius over parts of east and northeast India and near normal over the rest of the country. The lowest minimum temperature of 8.2 deg Celsius was recorded at Adampur in Punjab.
The IMD has maintained the forecast for a gradual but slight rise in maximum and minimum temperatures over many parts of the country during the next two to three days.
During the past 24 hours, isolated rain or snowfall has been reported from Himachal Pradesh and Uttarakhand in north and northwest India.
Widespread rain or thundershowers occurred over Andaman and Nicobar Islands while it was scattered over Arunachal Pradesh and Gangetic West Bengal and isolated over Andhra Pradesh, Orissa and Assam.
Short-term forecasts until Monday said that fairly widespread rain or thundershowers would occur over Andaman and Nicobar Islands.
Fairly widespread rain or thundershowers would occur over Arunachal Pradesh, scattered over the rest of the Northeastern States.
It will be isolated over east India and parts of south peninsular India on Saturday and Sunday.
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