East Wind Commences: Heavy Rain Expected Across South India (October 14, 2025 Weather Update)
Good morning! This is a comprehensive weather assessment for October 14, 2025. Please note that this is a personal weather estimation, and for official weather announcements and information, we strongly advise following the Indian Meteorological Department (IMD) and government notifications.
We are seeing a major shift in weather patterns across South India.
Key Meteorological Developments
The most significant recent development is the full commencement of the East wind (கிழக்கு திசை காற்று), which has started moving toward the coast. This shift in wind direction signals the setup for increased rainfall. This wind change indicates the arrival of the Northeast Monsoon wind structure.
Several atmospheric phenomena are contributing to the expected intensification of rain:
- Westerly Wind Burst (WWB): There is evidence of a WWB—indicated by a yellow color—along the equator, particularly below the Kanyakumari and Sri Lankan regions.
- Tropical Waves: The Madden-Julian Oscillation (MJO) and Equatorial Rossby Waves (ERW) are currently present (visible as dark blue areas in upper images).
- Cyclonic Circulations: An upper air cyclonic circulation is situated southeast of Sri Lanka. The support provided by the WWB is expected to strengthen this circulation, causing it to move further westward toward the Arabian Sea. Concurrently, another upper air cyclonic circulation is active in the Arabian Sea, southeast of Kerala.
- Rainfall Intensification: The combined effect of these two cyclonic circulations is anticipated to strengthen the East wind flow, leading to increased rainfall potential across many regions.
Recent Rainfall Reports
Chennai has been experiencing intermittent rainfall since midnight. Many areas are recording precipitation, including heavy rain near Tambaram and Kanchipuram.
Recent rainfall measurements (in millimeters) reported in the Chennai region include:
- Ayappakkam: 33 mm
- Madhavaram: 22.8 mm
- Ambattur: 22.2 mm
- Manali: 20.4 mm and 17.2 mm
- Korattur: 19.6 mm
- Anna Nagar West: 12.9 mm
- Kolathur: 12 mm
Light, widespread rain was also noted in areas such as Adyar, Velachery, and Medavakkam.
Across Tamil Nadu, substantial rainfall was recorded:
- Edapattu, Villupuram: 82 mm
- Vellakadai, Salem: 72.4 mm
- Kallakurichi (Kallakurichi District): 66 mm
- Allukoli: 62 mm
- Erode District: 62.4 mm
- Bellathi, Coimbatore: 62 mm
- Oddanchatram, Dindigul: 60.8 mm
- Mimisal, Pudukottai: 53.2 mm
Widespread rain has been reported across Tirunelveli, Villupuram, Virudhunagar, Pudukottai, Kallakurichi, Dindigul, Coimbatore, Theni, Tiruvannamalai, Erode, Tiruvarur, and Tiruchirappalli.
24-Hour Rainfall Forecast (Impact Set to Increase)
As the system is expected to strengthen, the intensity of rain is likely to increase.
Tamil Nadu (Widespread Moderate to Heavy Rain Likely):
- Southern Districts (Nagercoil, Kanyakumari, Tirunelveli, Tenkasi, Virudhunagar, Ramanathapuram, Sivaganga, Madurai, Theni): Moderate to heavy rain expected in many parts.
- Western/Interior Districts (Nilgiri, Coimbatore, Valparai, Erode, Tiruppur, Salem, Namakkal, Karur, Dindigul): Widespread moderate to heavy rain.
- Delta Regions (Sivaganga, Pudukottai, Thanjavur, Tiruvarur, Nagapattinam, Karaikal, Mayiladuthurai, Cuddalore): Widespread moderate to heavy rain.
- Central Interior (Ariyalur, Perambalur, Trichy, Kallakurichi): Widespread light rain, with moderate rain in isolated areas.
- Northern Interior (Krishnagiri, Dharmapuri, Salem, Tirupattur, Vellore, Tiruvannamalai): Light to moderate rain, with potential for heavy rain in a few areas.
- Northern Coastal (Chennai, Tiruvallur, Kanchipuram, Chengalpattu, Villupuram, Puducherry): Light to moderate rain is expected during the evening, night, and early morning hours, with potential for heavy rain in isolated areas. Moderate rain is also possible in parts of Ranipet district.
Kerala:
- Widespread moderate to heavy rain is expected in Thiruvananthapuram, Kollam, Palakkad, Malappuram, Kozhikode, Wayanad, Kannur, and Kasaragod.
- Heavy to very heavy rainfall is likely in Pathanamthitta, Idukki, Kottayam, Alappuzha, Ernakulam, Thrissur, and the coastal parts of Malappuram.
Karnataka:
- Widespread moderate rain is expected, including Bengaluru, Kolar, Chickballapur, Mandya, Chamrajnagar, Mysuru, Tumkur, Chitradurga, Hassan, Chickmagalur, Shivamogga, Uttara Kannada (coastal region), Udupi, Belagavi, Dharwad, Haveri, and Kalyana Karnataka.
- Heavy rainfall is particularly anticipated in Ballari, Vijayanagara, Dakshina Kannada, and Kodagu.
Andhra Pradesh:
- Widespread moderate to heavy rain is likely in Tirupati, Nellore, Kavali, Prakasam, Nandyal, Kurnool, Anantapur, Kadapa, Guntur, Vijayawada, Konaseema, Machilipatnam, Srikakulam, Visakhapatnam, Anakapalli, Alluri Sitaramaraju, and Eluru.
Telangana:
- Widespread moderate to heavy rain is forecasted for Kothagudem, Mahabubabad, Warangal, Khammam, Suryapet, Nalgonda, Nagarkurnool, Hyderabad, Wanaparthy, Jagtial, Mancherial, and Komaram Bheem.
- Light rain is expected in Vikarabad, Mahbubnagar, Yadgir, Jangaon, Siddipet, Medak, Karimnagar, Peddapalli, Jayashankar, Mulugu, Adilabad, and Nirmal.
Stay prepared and follow the latest updates. 'Nowcast Alerts' are continuously posted on our Facebook, Twitter, and WhatsApp channels, which you can follow via the links in the description.
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