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Cooler northwesterly winds associated with a prevailing western disturbance have earned “volatile purchase” across the eastern two-thirds of the landmass.
Seasonally unstable weather now transcends the Indo-Gangetic plains and has broken into east-central and adjoining parched outback of central India, parts of the eastern seaboard as well as into southern peninsula proper.
WEATHER FORMATIONS
This is the handiwork of the typical weather formations that have sprung up at vantage points across this region, thanks to the fluctuating fortunes of a semi-permanent and seasonal trough showing up in the upper levels of northwest and east India.
An India Meteorological Department (IMD) update on Monday evening said that scattered rain or snow has been reported from Jammu and Kashmir and Himachal Pradesh and isolated over Uttarakhand during the 24 hours ending in the morning.
Fairly widespread rainfall has occurred over sub-Himalayan West Bengal and Sikkim while it was scattered over Uttar Pradesh, the Northeastern States, Gangetic West Bengal and Kerala.
It was isolated over Bihar, west Madhya Pradesh, Jharkhand, Tamil Nadu and Andaman and Nicobar Islands.
Sustaining this unstable weather over disparate areas was mainly the western disturbance over Jammu and Kashmir and neighbourhood.
The IMD located the system east Jammu and Kashmir and adjoining Himachal Pradesh on Monday evening. It would continue to affect the western Himalayan region and adjoining plains until Thursday.
An upper air trough runs from Bihar to south Kerala across Vidarbha, and has thrown up upper cyclonic circulations over north Chhattisgarh and north Karnataka. The other stand-alone cyclonic circulation persisted over Assam.
A weather warning issued by the IMD said that isolated thunder squalls with wind speed exceeding 65 km/hr would occur over Bihar, Jharkhand, Orissa, West Bengal and Sikkim and with wind speed exceeding 45 km/hr over east Uttar Pradesh, Chhattisgarh, Arunachal Pradesh, Assam and Meghalaya until Thursday.
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