Bay of Bengal system triggers rain alerts in over 20 states

Despite the southwest monsoon nearing withdrawal, intense rain, storms and strong winds are affecting many parts of India. A depression or low-pressure system over the Bay of Bengal moved across Odisha and Chhattisgarh towards Uttar Pradesh and Madhya Pradesh, and its convergence with an active western disturbance boosted rain and lightning in north India. Over 20 states have weather alerts. Schools up to Class 12 are shut in Lucknow, Banda and Bahraich. Fresh moisture has slowed monsoon withdrawal by about a week.

Written by AI from Weather · not yet reviewed by an editor · Published 26 Sept 2026, 8:54 pm IST

Source

Weather · read the original report ↗

#monsoon#rainfall#bay of bengal#western disturbance#imd alert

Desk check · compared with the source

What the desk checked (5)

A depression or low-pressure system over the Bay of Bengal is driving intense rainfall across several states — Stated in source as the main cause; attributed to weather scientists in general terms, no named official or agency.
More than 20 states have received weather alerts, including Uttar Pradesh, Uttarakhand, Delhi-NCR and Himachal Pradesh — Figure appears in source; issuing authority not named.
Schools up to Class 12 closed in Lucknow, Banda and Bahraich; red alert issued for waterlogging and possible flooding — Appears in source without named official source.
Landslides reported in areas such as Darjeeling in sub-Himalayan West Bengal — Reported in source; no source cited for the report.
Monsoon withdrawal has temporarily slowed for about a week due to fresh moisture — Internally consistent with the source's explanation; no forecaster quoted by name.

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Analysts’ view opinion

AI Political Analyst

This is primarily a weather story, but the moment alerts go out to more than 20 states it becomes an administrative test first and a political one soon after. In Uttar Pradesh, shutting schools up to Class 12 in Lucknow, Banda and Bahraich and issuing a red alert lets governments show pre-emptive action — but if waterlogging and landslide damage mount, accountability questions will follow just as quickly. Where the Centre and the state share the same party, coordination will look seamless; where they do not, relief and compensation could become a point of argument.

Because more than 20 states are affected at once, it is hard for this to be framed as any single state government's failure.
Visible steps such as school closures and red alerts give administrations political cover as 'precaution taken in time'.
States run by different parties — Uttar Pradesh, Madhya Pradesh, Chhattisgarh, Odisha, West Bengal — being hit by one system will test Centre-state relief coordination.
Landslide risk in hill areas such as Uttarakhand and Darjeeling tends to revive local criticism over construction and road resilience.
A roughly week-long stall in monsoon withdrawal raises harvest-season risk, and any crop damage would push farmer compensation demands onto the political agenda.

What to watch — Watch whether states ask for special relief packages and crop-loss surveys once the rain eases, and how fast the Centre responds.

The story establishes only the weather system and the alerts — it reports no casualties, crop-loss figures, relief packages or statements by any leader, so the political consequences here are my inference, not reported fact.

Deep dive

Research brief · 8 facts · 5 dates · exam-ready

The brief

Context

The southwest monsoon had begun withdrawing from parts of northwest India, but instead of drying weather, much of the country is seeing intense rain, thunderstorms and strong winds. A depression or low-pressure system that developed over the Bay of Bengal moved inland across Odisha and Chhattisgarh towards Uttar Pradesh and Madhya Pradesh, pumping fresh moisture into the atmosphere. Its convergence with an active western disturbance over the hill areas of Uttar Pradesh and the mid-troposphere intensified rain and lightning across north India. Weather alerts are now in force for more than 20 states.

Key facts

A depression or low-pressure system over the Bay of Bengal moved from Odisha and Chhattisgarh towards Uttar Pradesh and Madhya Pradesh, bringing fresh moisture inland.
More than 20 states have received weather alerts for the coming days, including Uttar Pradesh, Uttarakhand, Delhi-NCR and Himachal Pradesh.
Schools up to Class 12 have been shut in Lucknow, Banda and Bahraich in Uttar Pradesh.
A red alert has been issued in Uttar Pradesh along with warnings of waterlogging and possible flooding.
Uttarakhand is on alert for heavy to very heavy rain, with raised risk of landslides and flash floods due to its hilly terrain.
Chhattisgarh saw heavy rain from the direct impact of the depression and had to close schools as well.
Landslides have been reported in areas such as Darjeeling in sub-Himalayan West Bengal; Odisha, West Bengal and Sikkim recorded very heavy rain.
Fresh moisture from the Bay of Bengal system has temporarily slowed further monsoon withdrawal by about a week.

Timeline

Before the current spellSouthwest monsoon begins withdrawing from parts of northwest India.
SubsequentlyA depression or low-pressure system develops over the Bay of Bengal and moves inland via Odisha and Chhattisgarh towards Uttar Pradesh and Madhya Pradesh.
Same periodA western disturbance turns active over the hill areas of Uttar Pradesh and the mid-troposphere; its cold winds move eastward and converge with moist Bay winds.
CurrentAlerts for over 20 states; red alert and school closures in Uttar Pradesh; school closures in Chhattisgarh; landslides reported in Darjeeling region.
Next about one weekFurther monsoon withdrawal expected to stay temporarily slowed due to renewed atmospheric moisture.

Who has a stake

Uttar Pradesh residents and administration — Torrential to very heavy rain has disrupted normal life in several districts; red alert, waterlogging and flood warnings, schools shut up to Class 12.
School students and parents (Lucknow, Banda, Bahraich, Chhattisgarh) — Classes suspended up to Class 12 as a safety measure during the heavy rain spell.
Uttarakhand and Himachal Pradesh hill communities — Intense rain on steep terrain raises the threat of landslides and flash floods.
Sub-Himalayan West Bengal, including Darjeeling — Very heavy rain has already triggered reported landslides.
Central and eastern states (Chhattisgarh, Madhya Pradesh, Odisha, Bihar, Jharkhand, Sikkim) — Direct or indirect impact of the depression with heavy rain and lightning warnings.
Southern and northeastern states (Andhra Pradesh, Telangana, Assam, Meghalaya, Nagaland, Manipur, Mizoram, Tripura) — Moderate to heavy rain and lightning warnings or expected rainfall.
Weather scientists/forecasters — Tracking the system, which they compared to a running tap continuously drawing moisture from the Bay of Bengal, and revising withdrawal timelines.

Why it matters

A late-season Bay of Bengal system interacting with a western disturbance can turn what should be a drying, post-monsoon period into days of red-alert rain, urban flooding, lightning deaths and hill-slope failures. It also delays monsoon withdrawal by around a week, which affects harvest, school schedules and disaster readiness in states that had already begun shifting to post-monsoon mode.

UPSC angle

Prelims pointers

A depression over the Bay of Bengal moved inland via Odisha and Chhattisgarh towards Uttar Pradesh and Madhya Pradesh, causing widespread rain.
Western disturbance: active over Uttar Pradesh's hill areas and the mid-troposphere, its cold winds moving eastward.
Convergence of moist Bay of Bengal winds with a northwesterly western disturbance boosted rain, storms and lightning in north India.
Over 20 states under weather alerts; red alert in Uttar Pradesh; schools shut up to Class 12 in Lucknow, Banda and Bahraich.
Fresh moisture slowed further southwest monsoon withdrawal by about a week.
Landslides reported in Darjeeling, sub-Himalayan West Bengal; landslide and flash-flood risk flagged for Uttarakhand.

Mains framing

The episode shows how India's monsoon withdrawal is rarely a clean, linear process: even as the southwest monsoon had begun retreating from parts of northwest India, a depression or low-pressure system over the Bay of Bengal acted, in scientists' words, like a running tap, continuously drawing moisture inland along its track through Odisha, Chhattisgarh, Madhya Pradesh and Uttar Pradesh, and recharging rain-bearing clouds so they could sustain long, intense spells. Superimposed on this was an active western disturbance over the hill areas of Uttar Pradesh and the mid-troposphere, whose eastward-moving cold winds converged with the moist easterly flow, amplifying rainfall, thunderstorms and lightning across the north. The consequences are asymmetric by geography: waterlogging, flood warnings and school closures in the plains of Uttar Pradesh and Chhattisgarh; landslide and flash-flood risk in Uttarakhand, Himachal Pradesh and sub-Himalayan West Bengal, where Darjeeling has already reported landslides. Because the renewed moisture has slowed further withdrawal by about a week, districts that had started experiencing post-monsoon conditions face sudden, widespread rain. The way forward, on the evidence in the source, lies in acting on multi-state alerts early through precautionary steps such as closing schools, issuing red alerts and warning of waterlogging, flooding, lightning and landslides, while treating withdrawal dates as provisional rather than fixed.

Key terms

Depression: A low-pressure weather system, here formed over the Bay of Bengal, that moved inland and directly caused heavy rain in Chhattisgarh and Madhya Pradesh.
Western disturbance: An extratropical system bringing cold winds from the northwest; it was active over Uttar Pradesh's hill areas and the mid-troposphere during this spell.
Convergence: The meeting of moist Bay of Bengal winds with the western disturbance's northwesterly flow, which intensified rain, storms and lightning in north India.
Monsoon withdrawal: The retreat phase of the southwest monsoon; here temporarily slowed by about a week due to fresh atmospheric moisture.
Red alert: The highest-level weather warning, issued in Uttar Pradesh along with waterlogging and possible flood warnings.
Mid-troposphere: The middle layer of the lower atmosphere where the western disturbance was active in this event.

Practice questions

Explain how a Bay of Bengal depression interacting with a western disturbance can delay southwest monsoon withdrawal and cause extreme rainfall over north India.
Discuss the differing disaster risks posed by the same rain-bearing system in the Indo-Gangetic plains and in Himalayan states such as Uttarakhand and sub-Himalayan West Bengal.
Late-season rainfall events challenge the assumption of a fixed monsoon withdrawal calendar. Examine the implications for early warning and local administrative preparedness.

Grounded only in the source report — figures and dates are the source's, not inferred.

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