Deep Depression Over South Odisha And Coastal Andhra Pradesh Triggers Heavy Rainfall, High Winds, And Landslide Alerts Across West Bengal

KalimNews, Sept 3, 2026, Kalimpong: Meteorological authorities have issued an extensive seven-day weather alert across West Bengal as a deep depression tracked over south Odisha and adjoining north coastal Andhra Pradesh continues to unleash vigorous monsoon activity across the region. 

Moving northwestward at an approximate speed of 10 kilometers per hour, the core of the system was centered near latitude 19.1°N and longitude 83.0°E—positioning it roughly 40 km northeast of Koraput, 60 km northwest of Parvatipuram, 90 km south-southwest of Bhawanipatna, 100 km east of Jagdalpur, and 270 km south-southeast of Raipur. 

While weather models indicate the system will steadily lose intensity into a standard depression within six hours and progressively weaken further over the subsequent 24-hour cycle, constant tracking by the Doppler Weather Radar at Visakhapatnam confirms that considerable moisture convergence will continue to affect the eastern seaboard and hinterlands.

In South Bengal, regional forecasts project widespread precipitation across all districts through the morning of September 25, with localized severe downpours ranging between 7 and 20 cm in East Midnapore, West Midnapore, and Jhargram. Surrounding areas including Kolkata, Howrah, Hooghly, North and South 24 Parganas, Bankura, Purulia, West Burdwan, and Birbhum are slated to receive steady heavy rains measuring 7 to 11 cm. 

Coastal zones face brisk winds between 40 and 50 kmph, alongside intense lightning, while interior districts will experience gusts between 30 and 40 kmph. This inclement pattern will persist into September 26 for western districts such as Purulia, Bankura, Birbhum, West Burdwan, and the Midnapore region, gradually transitioning to scattered rainfall by September 27 and intermittent localized showers through October 1. 

The chronological daily forecast for the state details significant atmospheric instability over the coming week:

• Day 1 (Valid till 08:30 hrs IST of September 25, 2026): In South Bengal, light to moderate rainfall and thundershowers will envelop most locations. Extremely heavy spells ranging between 7 and 20 cm are forecast for one or two areas in East Midnapore, West Midnapore, and Jhargram, while heavy downpours between 7 and 11 cm will lash Kolkata, Howrah, Hooghly, North and South 24 Parganas, Bankura, Purulia, West Burdwan, and Birbhum. Severe squalls reaching 40 to 50 kmph with intense lightning will strike South 24 Parganas and the Midnapore districts, alongside 30 to 40 kmph gusts in remaining southern areas. 

• In North Bengal, widespread rain covers all districts, highlighted by heavy to very heavy downpours of 7 to 20 cm in Darjeeling, Jalpaiguri, and Alipurduar, with heavy showers of 7 to 11 cm in Kalimpong, Cooch Behar, and North Dinajpur, accompanied by 30 to 40 kmph gusts and lightning across all northern districts.

• Day 2 (Valid from 08:30 hrs IST of September 25 to 08:30 hrs IST of September 26, 2026): Most areas across South Bengal will continue to experience light to moderate precipitation, with isolated heavy downpours measuring 7 to 11 cm persisting over East Midnapore, West Midnapore, Bankura, Purulia, West Burdwan, and Birbhum. Gusty winds of 40 to 50 kmph remain likely over South 24 Parganas and both Midnapore districts, with 30 to 40 kmph winds elsewhere. 

• Across North Bengal, showers will persist broadly, featuring very heavy downpours of 7 to 20 cm in Jalpaiguri and heavy rainfall of 7 to 11 cm across Darjeeling, Kalimpong, and Alipurduar, alongside continuous gusty winds of 30 to 40 kmph and lightning strikes across the entire northern belt.

• Day 3 (Valid from 08:30 hrs IST of September 26 to 08:30 hrs IST of September 27, 2026): South Bengal will see light to moderate rain or thundershowers spreading across many areas in all districts as atmospheric pressure gradually stabilizes. 

• Concurrently, North Bengal will witness showers over many locations, with heavy rain measuring 7 to 11 cm remaining concentrated at one or two places specifically within Jalpaiguri district.

• Day 4 to Day 7 (Valid from 08:30 hrs IST of September 27 to 08:30 hrs IST of October 1, 2026): Inclement conditions will taper off into a more scattered pattern across the state, with light to moderate showers or thundershowers expected at just a few places throughout all districts of both South Bengal and North Bengal.

Authorities warn that these conditions present serious operational hazards, including lightning discharges in open terrain, waterlogging across low-lying roads and subway underpasses, crop damage, the structural vulnerability of mud-built dwellings, and localized inundation across vulnerable stretches of Jhargram and the Midnapore basin.

Simultaneously, North Bengal braces for substantial precipitation that poses heightened environmental risks in mountainous terrain. Torrential showers between 7 and 20 cm are forecast through September 25 across Jalpaiguri, Alipurduar, and Darjeeling, complemented by heavy downpours reaching 7 to 11 cm across Kalimpong, Cooch Behar, and North Dinajpur, accompanied by widespread thunderstorms and gusts reaching up to 40 kmph. 

Severe precipitation will continue into September 26 with Jalpaiguri remaining on alert for very heavy rain, while Darjeeling, Kalimpong, and Alipurduar anticipate persistent heavy spells before tapering off gradually into isolated activity between September 27 and October 1. 

The most critical risk for the northern hills remains the acute potential for slope failures and landslides across vulnerable corridors of Darjeeling and Kalimpong districts, in addition to urban drainage congestion, standing crop spoilage, and sudden lightning strikes.

Marine and maritime operations remain severely restricted due to turbulent ocean dynamics. Wind speeds over the west-central and adjacent northwest Bay of Bengal, as well as off the south Odisha, north Andhra Pradesh, and Yanam shorelines, are registering between 45 and 55 kmph with peak gusts hitting 65 kmph, alongside coastal West Bengal squalls reaching 35 to 45 kmph with 55 kmph gusts through the morning of September 25. 

Given the prevailing rough to very rough sea conditions, maritime advisories strictly prohibit fishermen from venturing into the northern, west-central, and regional coastal waters until conditions normalize. Key shipping installations have initiated safety protocols, with Local Cautionary Signal Number Three hoisted at Kolkata and Haldia ports alongside Sectional Signals One and Two at Sagar Island Port. 

Disaster response agencies strongly urge the public to avoid open fields, tall trees, electrical installations, and standing bodies of water during storms, while municipal administrations have been advised to closely regulate coastal tourism, beach access, and highway transit until the system fully dissipates.