Role of Ocean Heat Content in the Rapid Intensification of Cyclone Amphan (2020) over the Bay of Bengal

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Role of Ocean Heat Content in the Rapid Intensification of Cyclone Amphan (2020) over the Bay of Bengal Author:Kritajno Bhattacharya Abstract   A major forecasting challenge in the North Indian Ocean is the rapid intensification (RI) of tropical cyclones, especially in the Bay of Bengal, where coastal communities are extremely vulnerable. The main indicator of cyclone intensification has historically been sea surface temperature (SST). Since it captures the total thermal energy available for cyclone growth outside of the surface layer, subsurface ocean heat content (OHC) has lately been acknowledged as a more accurate metric. This study examines how OHC contributed to Super Cyclonic Storm Amphan's (2020) quick intensification over the Bay of Bengal.We'll examine the atmospheric and oceanic factors that contributed to Amphan's abrupt intensification using Tropical Cyclone Heat Potential datasets, in-situ Argo float observations, and best-track records from the India Meteorol...
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West Bengal Weather Daily Bulletin — August 18th, 2025

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INDIAN WEATHER DESK

DAILY DISTRICT WEATHER BULLETIN – WEST BENGAL

Date of Issue: 17.08.2025 (1200 IST)
Valid for 24 hours: 18.08.2025 0530 IST to 19.08.2025 0530 IST



 SYNOPTIC OVERVIEW

As of 17.08.2025, a low-pressure area has formed over the northwest and adjoining areas of West Central Bay of Bengal and the South Odisha–North Andhra Pradesh coasts. This system is expected to move west-northwestwards and concentrate into a depression within the next 24 hours. The associated cyclonic circulation extends up to 9.6 km above mean sea level, tilting southwestwards with height.  

The monsoon trough at mean sea level now passes through Jaisalmer, Udaipur, Ratlam, the center of the low-pressure area over Vidarbha and its neighborhood, Jagdalpur, and thence east-southeastwards to the east-central Bay of Bengal.  



 SOUTH BENGAL CLUSTER

(Kolkata, Howrah, Hooghly, North & South 24-Parganas)

Weather: Cloudy with morning showers; light rain likely in the afternoon. 

Impacts: Possible waterlogging in low-lying areas such as Salt Lake, Dum Dum, and Behala. 

Advisory: Residents are advised to stay indoors during peak thunderstorm hours and avoid travel in waterlogged areas. 




 CENTRAL & WESTERN DISTRICTS

(East & West Medinipur, Bankura, Birbhum, Purulia, Murshidabad)

Weather: Cloudy with morning showers; light rain likely in the afternoon. 

Impacts: Localized flooding in low-lying areas; caution advised during travel. 

Advisory: Stay updated with local weather alerts and avoid crossing flooded roads. 



NORTH BENGAL & SUB-HIMALAYAN REGION

(Darjeeling, Kalimpong, Jalpaiguri, Alipurduar, Cooch Behar, Malda, Dinajpurs)

Weather: Heavy to very heavy rainfall likely, especially in the Alipurduar–Jalpaiguri belt. 

Impacts: Potential for flash floods and landslides in hilly areas; river levels may rise. 

Advisory: Residents in flood-prone areas should remain alert and follow evacuation orders if issued. 



ADVISORIES & PUBLIC SAFETY

Yellow Alert: Northern and Western districts + South 24 parganas 
Orange Alert: none
Red Alert: none. 


Precautions:

Avoid outdoor activities during thunderstorms. 

Secure loose objects that could become projectiles in strong winds. 

Stay informed through local news and official weather updates. 


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