Uttar Pradesh Rain Toll Rises to 56 as Two Weather Systems Collide

Uttar Pradesh has been battered by an unusually intense spell of rain that has left 56 people dead and 46 injured, according to the state's Office of Relief Commissioner. The downpour, accompanied by surface winds of 30–40 km/h, uprooted trees, brought down electricity poles and submerged roads, lanes and villages across Kanpur, Varanasi, Prayagraj, Gorakhpur, Bareilly and several other districts.

Official figures show the state received 45.1 mm of rainfall in the 24 hours ending Sunday morning, far above its normal daily average of 1.8 mm. As many as 56 of Uttar Pradesh's 75 districts recorded excess rainfall.

Why the rain has been so relentless

The India Meteorological Department traces the spell to an unusual convergence of two separate weather systems over northern India. A deep depression merged its moisture fields with an incoming Western Disturbance at a time when the southwest monsoon is withdrawing from the north-west of the country.

IMD Senior Scientist Dr Akhil Srivastava said the heavy rain occurred under the influence of a well-marked low-pressure area over northern parts of central Uttar Pradesh, producing isolated heavy to very heavy rain in western Uttar Pradesh and isolated heavy rain in the east. A thunderstorm and lightning warning was issued for western Uttar Pradesh, while no specific alert was issued for the eastern part of the state, where rainfall intensity has since declined.

The system began as a deep depression over the Bay of Bengal. It crossed the north Andhra Pradesh–south Odisha coast and moved inland to the north-west across north-eastern Madhya Pradesh before entering adjoining south-eastern Uttar Pradesh. By 5:30 am on Sunday it had tracked north-north-westwards across central Uttar Pradesh and weakened into a well-marked low-pressure area, though it retained enough moisture to sustain intense precipitation.

A depression is an organised low-pressure system formed by intense localised heating, in which warm, moist air flows inward and rises rapidly, condensing at cooler altitudes into large rain-bearing clouds.

Western disturbances are extratropical storms that originate over the Mediterranean, Black and Caspian seas and are carried eastward across Iran and Afghanistan towards north-west India by high-altitude subtropical westerly jet streams. When the cold upper-tropospheric trough of the Western Disturbance interacted with the tropical monsoon low-pressure system pushing up from Madhya Pradesh, atmospheric instability intensified, triggering widespread torrential rain and localised cloudburst-like events across the Terai belt and the plains.

Rivers swell, warnings issued

The combined effect produced exceptional rainfall totals across both eastern and western Uttar Pradesh. Major rivers including the Ghagra and Rapti have crossed critical warning thresholds at several monitoring stations, threatening low-lying rural and agricultural belts.

Forecasts indicate the well-marked low-pressure area over central Uttar Pradesh will continue moving north-north-westward and dissipate into a simple low-pressure system within about 12 hours. Isolated heavy rain is still expected in parts of Uttarakhand and western Uttar Pradesh, with conditions expected to normalise as the system clears by early October.

Agricultural authorities have advised farmers to drain standing water from rice, maize, sugarcane and pulse crops to prevent root rot. Residents have been cautioned against sheltering under isolated trees because of active cloud-to-ground lightning risks accompanying squally winds.