The Indo-Gangetic plain has been witnessing very heavy rainfall since Tuesday. As the monsoon gains strength over the region, the rains are forecast to increase and persist throughout the week.
The India Meteorological Department on Thursday said the states such as Bihar, East Uttar Pradesh and Uttarakhand are likely to witness heavy rainfall on Friday.
IMD issued an alert on Tuesday for heavy to very heavy rainfall at isolated places over Bihar till July 13. The national weather forecasting agency stated on Tuesday that the trough line was passing across Punjab, Haryana and moving further north towards UP, Bihar and parts of West Bengal and the north-eastern states.
Bihar had 45% rainfall deficiency in June. The recovery of monsoon showers is providing much-needed respite to Bihar as around 32 districts were facing deficient rainfall till last week.
Private weather agency Skymetweather also forecast gradual increase in the intensity of rain. It said Patna, Bhagalpur and Gaya will get moderate to heavy rainfall with one or two very heavy spells over the next one week. It attributed the ongoing rain to trough line extending from Punjab to Assam across Uttar Pradesh and Bihar.
Weathermen at Patna meteorological centre also attributed the showers to monsoon trough line as well as a cyclonic circulation over east Uttar Pradesh. “The monsoon trough line is passing through south Punjab to northeast Bay of Bengal via Haryana, east Uttar Pradesh and adjoining Bihar. Bihar gets good rainfall when the trough line passes through its normal position via Sri Ganganagar, Kanpur, Allahabad, Patna and West Bengal. Thus, the trough line is slightly south of its normal position at present, but it is moving northward,” said a Patna meteorological centre official.
Skymetweather also reported that the monsoon trough was expected to shift towards the foothills of the Himalayas, most probably around July 13 or 14. “As a result, the foothills of Himalayas along the Indo-Nepal border in Bihar will witness heavy to very heavy rain,” Skymet stated.
“During this period, the adjoining parts of Nepal too would experience heavy showers. And when heavy rains lash the foothills of Nepal, the water flows down to the foothills of Bihar as well, thus causing some intense flooding,” Skymet forecast stated.
It added that places such as West Champaran, Gopalganj, Sitamarhi, Madhubani, Koshi, Khagaria, and Supual are at the risk of flooding due to the incessant rains.