Bihar and East Uttar Pradesh Face Very Heavy Rain Through Friday

Key Takeaways:

• Bihar: Very heavy rainfall and thunderstorms are expected on October 29 and 30, with thunderstorm warnings continuing on October 31.
• East Uttar Pradesh: Very heavy rain is forecast for October 29, followed by heavy rainfall on October 30.
• Jharkhand: Very heavy rainfall is expected on October 29, with thunderstorm activity continuing on October 30.
• Agricultural Impact: Heavy rain may disrupt paddy harvesting, grain drying and transportation, while intense localised showers could cause waterlogging.
• Forecast Validity: October 29–31, 2026 (Next 3 Days)

Bihar and eastern Uttar Pradesh face an important late-October rainfall episode. We expect very heavy rain and thunderstorms. Bihar retains the very-heavy-rain category for October 29 and 30, while eastern Uttar Pradesh carries very heavy rain on Thursday, followed by heavy rain on Friday. Jharkhand also faces very heavy rain on October 29. These forecasts indicate a potentially disruptive spell during the harvesting season, although the strongest rainfall will not affect every district equally.

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The broader weather pattern includes moisture associated with Arnab’s weakening inland circulation and atmospheric disturbances farther north. As moist air spreads towards the eastern Gangetic plains, convergence and upward motion can support organised rain bands and thunderstorms. This is an inland rainfall episode, not a forecast of cyclone-strength winds over Bihar or Uttar Pradesh. Local rain intensity will depend on where the most persistent cloud bands develop and how quickly they move.

On Thursday, residents across the warned subdivisions should prepare for intermittent rain with locally intense spells. The available state-level products do not establish a precise onset time for Patna, Gaya, Varanasi or Gorakhpur, nor do they confirm measured rainfall at those cities. Be aware of district warnings and short-duration nowcasts before planning travel and making outdoor decisions. Thunderstorms and lightning are separately indicated, making shelter important even where the rain itself is initially light.

By October 30, the higher rainfall concern persists over Bihar, while eastern Uttar Pradesh’s warning reduces to heavy rain. Jharkhand’s product retains thunderstorms but no longer lists a heavy-rain category. On October 31, Bihar continues to carry thunderstorm-related warnings, whereas eastern Uttar Pradesh and Jharkhand list no subdivision-level warning. The overall pattern, therefore, points towards a gradual reduction from the west and south, rather than an abrupt simultaneous clearance everywhere.

Wet weather may interrupt paddy harvesting, grain drying and the movement of agricultural produce. Farmers should keep harvested material under cover and postpone spraying when thunderstorms threaten. Motorists should avoid flooded underpasses and flowing water across roads. Intense rainfall can increase runoff, but a rainfall warning alone does not establish river flooding; that depends on catchment rainfall, river levels and drainage. Residents should follow local flood information alongside the weather forecast.

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