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 29th, 2025

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INDIAN WEATHER DESK

DAILY DISTRICT WEATHER BULLETIN – WEST BENGAL

Date of Issue: 29.08.2025 (0500 IST)
Valid for 24 hours: 29.08.2025 (05:30 IST) to 30.08.2025 (05:30 IST)




SYNOPTIC OVERVIEW

A well-marked low-pressure area persists over the northwest Bay of Bengal off the Odisha–West Bengal coast, with cyclonic circulation extending up to approximately 7.6 km above mean sea level .



SOUTH BENGAL CLUSTER

(Kolkata, Howrah, Hooghly, North & South 24 Parganas, East & West Midnapore, Jhargram, Bankura, Birbhum)

Weather: Light to moderate rain or thundershowers very likely at most places, with thunderstorms, lightning, and gusty winds (30–40 km/h) very likely at one or two places across all districts of South Bengal .

Impacts:

Potential for waterlogging in low-lying areas and urban centers.

Reduced visibility and possible traffic disruptions.

Risk of lightning-related incidents.


Advisory:

Avoid open areas such as under trees and power lines during storms.

Exercise caution while traveling in waterlogged areas.





NORTH BENGAL & SUB-HIMALAYAN REGION

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

Weather: Light to moderate rain or thundershowers very likely at most places. Heavy rainfall (7–11 cm) very likely at one or two locations over Jalpaiguri, Alipurduar, and Cooch Behar districts. Thunderstorms, lightning, and gusty winds (30–40 km/h) very likely at one or two places across North Bengal .

Impacts:

Increased risk of flash floods and elevated river levels.

Landslide-prone areas especially vulnerable.

Poor visibility may affect travel and local activities.


Advisory:

Avoid travel in landslide-prone regions.

Follow updates or evacuation directives from local authorities.

Stay indoors during storms for safety.





FISHERMEN & COASTAL UPDATE

Squally conditions are expected along and off the Odisha coast and the north Bay of Bengal, with surface winds of 35–45 km/h (gusting to 55 km/h), and sea conditions will be rough to very rough. Fishermen are advised not to venture into deep sea over the area during this period .




ADVISORIES & PUBLIC SAFETY

Yellow Alert remains in force for South Bengal. North Bengal continues under heightened caution due to heavy rainfall risks.

Precautions:

Stay indoors during thunderstorm activity.

Avoid open or low-lying routes.

Be vigilant in hilly zones prone to landslides.

Fishermen and marine users should postpone operations due to hazardous sea conditions.


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