As of July 27th, Delhi is rain deficient by 22%. Delhi has received 182.7 mm rain against the normal of 232.9 mm. Punjab is a rain surplus by 3% and Haryana by 5%. Uttar Pradesh has received 2% surplus rain. But if we divide Uttar Pradesh into East and West, then east Uttar Pradesh is surplus by 21%, whereas west Uttar Pradesh is deficient by 33%. Bihar is the only state in Indo Gangetic plains with a surplus of 47%.
Rain activity already increased over Uttar Pradesh and Bihar for the last 24 hours. The axis of monsoon trough which was running close to the foothills is now shifting south. Rain activities will increase further over Uttar Pradesh and Bihar and may continue until August 1st or 2nd. Flood situation over Bihar will get more severe as rain activities over the Nepal region will also remain vigorous.
Delhi, Haryana, and Punjab will start receiving rain and thundershower activities from July 29. Heavy rain and thundershowers are possible over these states on July 30 and 31st. Strong winds accompanied with lightning strikes cannot be ruled out. These rain activities along the Indo Gangetic plains, from Punjab to Bihar, will help in bringing down the temperatures. Weather will become comfortable and there will be a significant relief from ongoing sultry weather conditions. These rains will be a blessing for farmers of Punjab Haryana and Uttar Pradesh. But as Bihar is reeling under severe flood conditions, heavy rains will certainly increase the water flow in Gandak, Bhagmati, Budhi Gandak, Koshi, Kamlabalan, and Ganga rivers.