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 daily weather bulletin — August 3rd, 2025

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                                            INDIAN WEATHER DESK 

DAILY DISTRICT WEATHER BULLETIN – WEST BENGAL
Date of Issue: 03.08.2025 (1200 IST)
Valid for 24 hours: 03.08.2025 0530 IST to 04.08.2025 0530 IST

SYNOPTIC OVERVIEW

(Valid as of 03.08.2025, 12:00 IST)

A cyclonic circulation persists over the northwest Bay of Bengal, extending inland across Gangetic West Bengal. The monsoon trough remains active over eastern India and is drawing heavy moisture into the region. According to IMD’s national bulletin, Sub‑Himalayan West Bengal is expected to receive “extremely heavy rainfall on 2nd & 3rd August.



SOUTH BENGAL CLUSTER

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

Expect moderate to heavy rainfall throughout the day; Kolkata may see persistent showers in the late morning and a brief breakup in the afternoon (as shown in the hourly widget above). Thunderstorm activity with gusty winds and isolated lightning is possible—especially between 11:00 AM and 3:00 PM. Be wise to expect waterlogging in low-lying city pockets like Salt Lake, Dum Dum, and Behala.




 CENTRAL & WESTERN DISTRICTS

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

More than half the districts are likely to experience moderate to heavy rainfall today, especially in Medinipur and Bankura. Local convective storms may produce brief periods of intense rain (around 20 mm/hr). Murshidabad and Birbhum could see isolated thunderstorms by evening—with gusty outflows but shorter duration.



 NORTH BENGAL & SUB-HIMALAYAN REGION

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

Rainfall in the foothill regions will be persistent and intense, aligning with IMD’s "extremely heavy rainfall" forecast specifically for Sub-Himalayan West Bengal. Expect heavy to very heavy showers, with strong clouds and potential for flash flood conditions in Alipurduar–Jalpaiguri belt. The plains of Malda could receive moderate rain, but thunderstorms with strong winds may be felt locally.




🛑 ADVISORIES & PUBLIC SAFETY

🟨 Yellow Alert across all South and Central‑West
🟧 Orange Alert in 2 Northern Districts
🟥Red Alert in 3 northern districts

Local authorities should prepare for urban waterlogging, especially Kolkata and coastal Medinipur.

Precautions:

Avoid open spaces during storms

Secure loose roofing/hoardings

Stay alert to emergency rainfall warnings


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