Although late September traditionally marks the phased retreat of the southwest monsoon, atmospheric conditions across India remain intensely turbulent. Weather authorities have placed 18 states on alert for intense precipitation and severe squalls scheduled to peak on September 20. The affected expanse spans Uttar Pradesh, Bihar, Rajasthan, Madhya Pradesh, Jharkhand, West Bengal, and Odisha. Gusts in several pockets are projected to reach speeds between 60 and 70 kmph, presenting significant hazards from falling trees, snapped overhead power cables, and flying debris. Meanwhile, lightning strikes threaten eastern belts, hillside terrains face heightened landslide risks, and rough sea swells have necessitated clear precautionary warnings for coastal fishermen.
Cyclonic Systems and Marine Disturbance Dynamics
The meteorological volatility is rooted in interacting systems positioned over the Bay of Bengal and adjoining coastal landscapes. An upper-air cyclonic circulation is expected to hold its position across northern Gujarat and adjacent sectors over the next 24 hours. Concurrently, another cyclonic formation remains firmly established over the transitional belt of West Bengal, northern coastal Odisha, and Jharkhand.
Compounding this setup, a low-pressure area is taking shape along the maritime border of southern Odisha and northern Andhra Pradesh, with projections showing it pushing inland. This combined atmospheric momentum will drive precipitation patterns across wide stretches of central and eastern India. Given the accompanying turbulence over the waters, fishermen have been advised against venturing into the open sea. Down south, scattered spells of rain are slated to persist across Tamil Nadu, Puducherry, and Karaikal.
Forecast for the National Capital Region
Sudden weather shifts are anticipated across Delhi and the wider National Capital Region on September 20. The capital is under warning for substantial rain accompanied by gusty thunderstorms. Surface winds during this disturbance are modeled to clock speeds between 30 and 40 kmph.
Waterlogging is likely to impede commuter movement across several transit bottlenecks. In terms of thermal metrics, Delhi is projected to register an afternoon high close to 34 degrees Celsius alongside an overnight low of 24 degrees Celsius. Residents have been cautioned against sheltering under brittle tree branches or lingering near unsecured hoardings during high winds.
Extended Disturbance Pattern Across Uttar Pradesh
Uttar Pradesh faces an active spell of storms and torrential showers spanning September 20 and 21. The belt under vigilance extends from western hubs like Meerut, Muzaffarnagar, Ghaziabad, Moradabad, Aligarh, Agra, and Mathura to central and eastern territories including Kanpur, Unnao, Etawah, Hathras, Hardoi, Raebareli, Hamirpur, Sultanpur, Azamgarh, Gorakhpur, Ayodhya, and Prayagraj.
Sudden thunderclaps and overcast conditions are expected to dominate throughout this window. Lucknow is forecast to witness a daytime maximum around 34 degrees Celsius, cooling to 26 degrees Celsius at night. Agricultural laborers and outdoor personnel have been urged to exercise heightened caution during the peak hours of the squall.
Severe Lightning and Thunderstorm Risks in Bihar
Atmospheric instability across Bihar will remain elevated throughout September 20. Heavy rainfall coupled with storm activity is forecast across a broad perimeter covering Patna, Gaya, Jehanabad, Bhojpur, Buxar, Rohtas, Gopalganj, East Champaran, and West Champaran.
Similar alerts envelop Vaishali, Samastipur, Darbhanga, Saharsa, Supaul, Madhubani, Katihar, Purnia, Araria, Kishanganj, Bhagalpur, Munger, Lakhisarai, Khagaria, and Begusarai. Patna is expected to record a peak temperature of 34 degrees Celsius with minimum readings hovering near 27 degrees Celsius. Rural populations are advised to remain within durable brick-and-mortar structures to avoid lightning strikes and stay clear of power installations during wind gusts.
Jharkhand Wet Spell Scheduled Through September 22
Jharkhand is poised for an extended stretch of wet weather and blustery squalls lasting from September 20 through September 22. Multiple districts including Ranchi, Jamshedpur, Bokaro, Dhanbad, Deoghar, Ramgarh, Khunti, Hazaribagh, Giridih, Palamu, Chatra, Dumka, Simdega, Gumla, Latehar, and West Singhbhum fall under the heavy downpour warning.
Ranchi is anticipated to see temperatures hover around a maximum of 30 degrees Celsius and a minimum of 23 degrees Celsius on September 20. Due to frequent lightning risks, individuals are strictly advised against standing under solitary trees or in exposed fields during storm spells.
Gale Warnings for West Bengal and Rajasthan
In West Bengal, severe storms are likely to generate wind speeds ranging from 55 to 60 kmph on September 20. Downpours are slated to impact Kolkata, Howrah, Birbhum, Malda, Purulia, Darjeeling, Kalimpong, Nadia, Durgapur, and Murshidabad. Kolkata is expected to see mercury readings peak at 31 degrees Celsius before dipping to 27 degrees Celsius overnight, with weak hoardings and branches vulnerable to damage.
Farther west, Rajasthan will encounter even stronger velocity winds. Pockets across Jaisalmer, Bikaner, Jaipur, Sikar, Jhunjhunu, Churu, Ajmer, Tonk, Sawai Madhopur, Bundi, Chittorgarh, Dholpur, and Bharatpur could experience storm winds peaking between 60 and 70 kmph alongside rainfall. Jaipur is forecast to see a high of 33 degrees Celsius and a low of 24 degrees Celsius, urging road travelers to maneuver with elevated vigilance.
