The weather warning comes at a time when several parts of Bihar are already dealing with rising river levels and flooding. The Ganga water level has started rising again, while the Gandak and Kosi rivers are also being closely monitored amid continuing rainfall in their catchment areas. Which 12 Bihar Districts Are Under Yellow Alert?The yellow alert covers the following 12 districts:West ChamparanEast ChamparanGopalganjSiwanSaranVaishaliMuzaffarpurSheoharSitamarhiSamastipurDarbhangaMadhubaniAccording to the weather update, these districts may experience rain along with thunder and lightning. Gusty winds of around 30 kmph are also possible during local weather activity. Residents have been advised to remain alert, particularly during thunderstorms. The India Meteorological Department's Patna centre has also listed thunderstorm and lightning activity for Bihar on September 28. Its broader forecast indicates that the weather situation is expected to become less active after September 28. Why Is Rain Expected in Bihar?Several weather systems are influencing conditions over Bihar and adjoining regions. A low-pressure area over northern-central Uttar Pradesh, a cyclonic circulation and low-pressure area near the southern Myanmar region, and a north-south trough extending towards the west-central Bay of Bengal are contributing to increased weather activity, according to current weather reporting. These systems have resulted in rainfall activity across different parts of Bihar. While the yellow alert does not indicate extremely heavy rainfall across the entire state, thunderstorms, lightning and strong winds can create local problems, including waterlogging and disruption to transport.Ganga Water Level Rises AgainThe Ganga water level in Bihar has also become a concern as rainfall continues. In Begusarai, the river level increased by around 2 cm during the previous 24 hours, with the possibility of a further rise being reported. Official river monitoring data also shows several stations in Bihar where rivers are above their warning levels. The Bihar Flood Management Information System recorded the Ganga above the warning level at monitoring points including Azmabad and Kahalgaon in Bhagalpur and Gandhi Ghat and Kolhachak in Patna.At Gandhi Ghat in Patna, the Ganga was recorded above the warning level in the latest available monitoring data, although the trend at that station was shown as falling at the time of the observation. Other stations showed varying trends, underlining the importance of monitoring individual river locations rather than relying on one statewide trend. Gandak and Kosi Also Remain a ConcernThe weather situation is particularly important for northern Bihar because rainfall in Nepal's Terai region can affect rivers flowing into the state. Recent reports have highlighted rising water levels in the Gandak and Kosi systems.The latest flood-related reporting said several villages in northern Bihar have been affected by rising water, with parts of West Champaran and Supaul facing flooding. The Valmikinagar Barrage also recorded a major discharge into the Gandak following heavy rainfall in the Nepal catchment. Bihar's official river monitoring system has also recorded the Gandak above warning levels at locations including Dumariaghat in Gopalganj, Lalganj in Vaishali and Bagaha in West Champaran. What Is the Weather Outlook for Patna?Patna is not among the 12 districts specifically named under the yellow rain alert in the district-wise report. The city's weather on Monday is expected to remain comparatively normal, with sunshine and intermittent clouds possible. A separate weather update showed temperatures around the low 30s Celsius in Patna. However, conditions can change quickly during local thunderstorms. Residents in and around Patna and other districts are therefore advised to follow official weather and disaster-management updates.Weather Expected to Improve From September 29The current forecast suggests that Bihar's weather activity could weaken from September 29, with temperatures likely to rise gradually in several areas. The IMD's Patna centre currently shows no specific warning for September 29 and the following days in its subdivision forecast. For now, the focus remains on the 12 districts under the September 28 yellow alert and on river levels across flood-sensitive parts of Bihar. Authorities are continuing to monitor rainfall, river conditions and vulnerable areas as the state moves toward the end of the monsoon season.The article is written in an information-first news format, with all 12 districts named and the rainfall alert, Ganga level, Gandak/Kosi situation, Patna weather and September 29 outlook covered.Also Read : Madhya Pradesh Rain Alert: Very Heavy Rain in 13 Districts
