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The countdown over the Bay of Bengal said that the brewing low-pressure area could show up in as shorter a timeline as by tomorrow (Tuesday).
India Meteorological Department (IMD) traced the persisting causative upper air cyclonic circulation to over the central parts of south Bay of Bengal this (Monday) morning.
Towards the north of the country, a prevailing western disturbance over east Jammu and Kashmir and adjoining Himachal Pradesh has moved away eastwards.
A fresh westerly system is expected to enter the western Himalayan region and affect adjoining plains of northwest India from Thursday onwards.
Scattered rain or thundershowers would break out over western Himalayan region and isolated dust storms or thunderstorms over adjoining plains of northwest India, the IMD outlook said.
Towards the east, an upper air cyclonic circulation lies over east Uttar Pradesh and adjoining Bihar. A weather-making trough from this system runs down to south Andhra Pradesh across east Madhya Pradesh and Vidarbha.
A weather warning valid until Wednesday said that isolated thunder squalls may occur over Bihar, Jharkhand, Chhattisgarh, West Bengal, Sikkim, Orissa and the Northeastern States.
Yet another upper air cyclonic circulation over Assam and neighbourhood persists. Satellite pictures early on Monday morning showed convective (thunderstorm-laced) clouds standing tall over parts of Maharashtra, east-central and south Bay of Bengal, the Andaman Sea and southeast Arabian Sea.
Maximum temperatures on Sunday (yesterday) were above normal by 2-3 degree Celsius over parts of Jammu and Kashmir, Himachal Pradesh, Uttarakhand, Punjab, Haryana, and north Madhya Pradesh.
But they continued to be below normal by 2-4 degree Celsius over parts of Arunachal Pradesh, Assam, Vidarbha, Telangana and Rayalaseema.
The highest maximum temperature of 44.8 degree Celsius was recorded at Jalgaon in Maharashtra.
Mainly dry weather would prevail over northwest and adjoining west and central India until Wednesday but they may head north thereafter.
Maximum heating would gradually extend to central India and east-central India as the week wears on, say global models.
Meanwhile, widespread rainfall was reported over Andaman and Nicobar Islands during the day on Sunday.
It was scattered over the Northeastern States and isolated over Jammu and Kashmir, Himachal Pradesh, Uttarakhand, Orissa, sub-Himalayan West Bengal, Sikkim, Chhattisgarh, Maharashtra, Andhra Pradesh, Karnataka and Kerala.
A short-term outlook said that widespread rain or thundershowers would occur over Andaman and Nicobar Islands, scattered over Karnataka, Kerala and Lakshadweep and isolated over rest south peninsular India until Thursday.
Scattered rain or thundershowers would occur over sub-Himalayan West Bengal and Sikkim and isolated over rest of east India until Wednesday. Fairly widespread rain or thundershowers would occur over the Northeastern States.
An extended outlook until Saturday said that scattered rain or thundershowers would occur over the Northeastern States and adjoining east India.
Fairly widespread rain or thundershowers would occur over the Andaman and Nicobar Islands and isolated over south peninsular India.
Scattered to fairly widespread precipitation activity would occur over western Himalayan region and isolated dust storm or thunderstorm would occur over adjoining plains of northwest India.
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