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 Bulletin — September 11th, 2025

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                                          INDIAN WEATHER DESK
             WEEKLY DISTRICT WEATHER BULLETIN – WEST BENGAL
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Date of Issue: 10.09.2025 (0500 IST) 
Valid Period: 11.09.2025 to 19.09.2025




SYNOPTIC OVERVIEW

A low-pressure area is expected to form over the northwest Bay of Bengal around 13th September, which may enhance rainfall activity across West Bengal.

Active monsoon conditions are likely to continue, bringing light to moderate rainfall to most districts.

Isolated heavy rainfall is possible over southern and sub-Himalayan districts, especially around 13th–15th September.

Expect thunderstorms, lightning, and gusty winds (30–40 km/h) at isolated locations during heavy showers.





SOUTH BENGAL

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

Weekly Weather Summary:

11–12 Sept: Light to moderate rain with isolated thunderstorms.

13–15 Sept: Moderate to heavy rain at one or two locations; thunderstorms likely.

16–19 Sept: Light rain or thundershowers at many places; rainfall intensity may reduce gradually.


Impacts:

Localized waterlogging in low-lying urban and rural areas.

Reduced visibility affecting traffic and outdoor activities.

Lightning-related risks during thunderstorms.


Advisory:

Avoid standing under trees or power lines.

Exercise caution on waterlogged roads.

Stay indoors during thunderstorms.




NORTH BENGAL & SUB-HIMALAYAN REGION

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

Weekly Weather Summary:

11–12 Sept: Light to moderate rain at many places; isolated thunderstorms.

13–15 Sept: Heavy rainfall (7–11 cm) at one or two locations in Jalpaiguri and Alipurduar; thunderstorms and gusty winds.

16–19 Sept: Moderate rainfall likely at several locations; isolated heavy rain possible.


Impacts:

Risk of flash floods and rising river levels.

Landslide-prone regions may face slope failures.

Poor visibility affecting travel in hilly areas.


Advisory:

Avoid travel in unstable or landslide-prone areas.

Follow local advisories and seek safe shelter during heavy showers.

Travelers and tourists in hilly areas should remain cautious.





FISHERMEN & COASTAL UPDATE

Sea conditions: Hazardous due to the low-pressure system formation in the Bay of Bengal.

Advice: Fishermen should avoid venturing into deep sea or coastal waters until further notice.




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