Expect Widespread Convective Rains (Forecast for November 4, 2025)
Good Morning!
Welcome to this weather analysis update based on the forecast provided on November 4, 2025. As we move through the first week of November, dynamic weather patterns continue across South India, bringing significant rainfall to several states.
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The Developing Weather System - Todays Forecast 04.11.2025
A major focus of the current forecast is the evolving low-pressure system. This system, which originated near the Myanmar region as a medium-level atmospheric swirl (à®®ீன் வடிமண்டல à®®ேடுக்கு சுழச்சி தாà®´் பகுதியாக), is now expected to strengthen. Experts anticipate that this low-pressure area will intensify into a well-marked low-pressure area (நன்கு à®…à®®ைந்த தாà®´் பகுதி).
This system is projected to move towards the region between West Bengal and Bangladesh. It is expected to approach the coast sometime tomorrow (relative to the broadcast date).
Why the Rain? The Role of Westerly Winds
Even as the low-pressure system moves north and east, its influence is being felt strongly across South India. The source notes that the presence of westerly winds (à®®ேà®±்கு திசை காà®±்à®±ு) over South Indian regions, including Tamil Nadu, due to this low-pressure area, is triggering convective rain (வெப்பச்சன மழை) along coastal Tamil Nadu.
Rainfall was already observed yesterday (November 3rd) in parts of North Tamil Nadu, including districts like Chennai, Chengalpattu, Villupuram, and Tiruvannamalai.
Immediate Forecast: Next 24 Hours (Starting November 4, 2025)
The weather convergence is shifting southward, approaching the Delta districts. Rain is anticipated across Tamil Nadu and South Tamil Nadu in the coming days (tomorrow and the day after).
Here is the breakdown of the rainfall expected across South India over the next 24 hours:
Tamil Nadu & Pondicherry
A widespread pattern of rain is expected across Tamil Nadu, with varying intensities.
- Widespread Moderate to Heavy Rain with Thunder is forecast for Coastal and North districts, including Chennai, Tiruvallur, Kanchipuram, Chengalpattu, Villupuram, Puducherry, Cuddalore, Mayiladuthurai, Tiruvarur, Nagapattinam, and Karaikal.
- Light to Moderate Rain is expected in many interior, western, and southern districts. This includes Ranipet, Vellore, Tiruvannamalai, Tirupattur, Krishnagiri, Dharmapuri, Kallakurichi, Salem, Perambalur, Ariyalur, Thanjavur, Erode, Coimbatore, Nilgiris, Madurai, Theni, Ramanathapuram, Tenkasi (near the Western Ghats), Manjolai regions, and parts of Kanniyakumari district.
Kerala
Kerala is set to receive significant rainfall:
- Moderate to Heavy Rain is forecast for Thrissur, Ernakulam, Kottayam, and Alappuzha districts.
- Light Rain is possible in Kasaragod, Kannur, Kozhikode, Wayanad, Malappuram, Palakkad, Idukki, Pathanamthitta, Kollam, and Thiruvananthapuram districts.
Karnataka
The forecast indicates varying rain intensities across Karnataka:
- Moderate to Heavy Rain is anticipated in Bidar, Raichur, Bellary, Tumakuru, Bengaluru, and Ramanagara districts.
- Light Rain is expected in other remaining districts.
Andhra Pradesh & Telangana
Both Telugu states will also experience wet weather:
- Andhra Pradesh: Widespread moderate to heavy rain with thunder is likely in Kurnool, Nandyal, Prakasam, Kavali, Nellore, Tirupati, and Chittoor districts. Interior Rayalaseema will see light to moderate rain, while Central and North Coastal Andhra regions may experience moderate rain.
- Telangana: Districts like Yadagir, Nagarkurnool, Warthi Vanapathi, Jajjalamba, and Khammam are expected to see moderate to heavy rain with thunder. Light to moderate rain is possible in other districts, including Hyderabad.
Looking Ahead: Northeast Monsoon Continuation
While we focus on the immediate 24-hour forecast, the sources indicate a look toward sustained rainfall activity. The continuation of the Northeast Monsoon (வடகிழக்கு பருவமழையினுடைய தொடர்ச்சி) is anticipated starting from the 11th (of November). East winds (கிழக்கு திசை காà®±்à®±ு) and rain are expected to commence around that time, with further updates to follow.
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Remember, for official weather announcements and information, please follow the Indian Meteorological Research Center (இந்திய வானியிலை ஆராய்ச்சி à®®ையம்) and other official government announcements. #BayOfBengal #TamilNaduRainfall #CycloneWatch #TNWeather #SouthIndiaRains #WeatherUpdate #Nov4 #NEM2025 #Masrainman #ChennaiRains
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