Patna, June 23: Those of you who find the heat unbearable, brace yourself. You will have to bear the sultry conditions for 72 more hours, claim weathermen.

Rain is unlikely for the next three days.

“Monsoon remained active in Bihar till June 20, after which it became weak leading to a lull,” Patna Met director Animesh Chanda told The Telegraph.

The rain-bearing winds entered the eastern parts of the state on June 15 this year. By June 17, it covered the whole state. Most parts of the state received good rainfall (see table). Till June 22, the state received 139.7mm rainfall.

The state receives 169.7mm rainfall in June in a normal monsoon year. Sources said as seven days are still left, the rainfall would be more or less normal in this month.

Giving reasons for the monsoon becoming weak after the initial days, Chanda said the favourable system that brought rainfall to the state moved away, leading to an absence of rainfall.

“Conditions are likely to improve in the next two to three days,” he added.

Abdul Sattar, an assistant professor in the department of meteorology, Rajendra Agriculture University, said: “Generally, a favourable system develops over the Bay of Bengal in the form of a depression during monsoon. When it moves in the north-west direction, it brings rainfall. One such system led to timely arrival of monsoon in the state. According to the analysis of satellite images, another such system is likely to develop after June 26. That would bring more rainfall to Bihar.”

He said another important factor during monsoon is the position of the monsoon trough line that extends from west to east.

“The present position of the trough line is favourable. As soon as the favourable system develops, the state will get good rainfall,” he added.

As of today, the trough line axis is positioned at Churu in Rajasthan, Jamshedpur in Jharkhand and the Bay of Bengal. During monsoon, places south of the trough line experience precipitation.

Sattar said the second trench of monsoon would bring more rainfall in the Terai region — West Champaran, East Champaran, Sitamarhi and Madhubani — and parts of east Bihar. The remaining parts of the state were likely to receive moderate rainfall.

He also said the lull was normal and added that favourable systems keep developing after a gap of three to five days. It would be a matter of concern only if the lull lasted even after June 26.

High humidity and temperature has made the lull period very uncomfortable for the residents of the state.