இ ய அர

இ ய வா ைல ஆ ைற GOVERNMENT OF INDIA
ம டல வா ைல ஆ ைமய INDIA METEOROLOGICAL DEPARTMENT
6, க சாைல Regional Meteorological Centre
ெச ைன - 600006 No. 6, College Road
ெதாைலேப : 044- 28271951 Chennai–600006
Phone: 044- 28271951

WEEKLY WEATHER REPORT FOR TAMILNADU, PUDUCHERRY

& KARAIKAL FOR THE WEEK ENDING 11th DECEMBER 2024
20 Agrahayana 1946 (SAKA)
Chief synoptic features and its associated weather:

Last week’s cyclonic circulation over Eastcentral & adjoining Southeast Arabian Sea lay
over Southeast Arabian Sea & neighbourhood and extended upto 4.5 km above mean sea level
tilting south-westwards with height on 05th; lay over southwest & adjoining southeast Arabian
sea and extended upto 1.5 km above mean sea level on 06th Dec 2024.
An upper air cyclonic circulation lay over Equatorial Indian Ocean & adjoining southeast
Bay of Bengal and extended upto 3.1 km above mean sea level on 06th; lay over Southeast Bay of
Bengal & adjoining Equatorial Indian Ocean and extended upto middle tropospheric levels on
07th; Under its influence, a Low Pressure Area formed over Southeast Bay of Bengal & adjoining
East Equatorial Indian Ocean on 07th with associated upper air cyclonic circulation extending
upto middle tropospheric levels; persisted over the same region on 08th& 09th; became more
marked and lay as a Well marked low pressure area over southwest bay of Bengal on 10th with
the associated upper air cyclonic circulation extending upto mid-tropopheric levels; lay over
southwest Bay of Bengal off Sri Lanka coast with associated upper air cyclonic circulation
extending upto mid-tropospheric levels on 11th Dec 2024.
Rainfall:
Rainfall occurred over Tamilnadu at a few places on 05th; at isolated places from 06th - 11th;
over Puducherry on 05th &11th; over Karaikal area on 11th. Dry weather prevailed over
Puducherry from 06th - 10th; over Karaikal area from 05th - 10th Dec 2024.
Isolated heavy to very heavy rainfall occurred over Tiruvannamalai district on 05th Dec
2024.

Chief amount of Rainfall (in cm):

05-12-2024: Kalasapakkam (dist Tiruvannamalai) 12, Vaniyambadi (dist Tirupathur) 6,
R.S.Mangalam (dist Ramanathapuram), Jamunamarathur (dist Tiruvannamalai), Alangayam
(dist Tirupathur) 5 each, Gummidipoondi (dist Tiruvallur), Zone 12 Alandhur (dist Chennai) 4
each, Zone 12 Meenambakkam (dist Chennai), Chennai (AP) (dist Chennai), Alandur (dist
Chennai), Vilupuram (dist Villupuram), Meenambakkam AWS (dist Chennai), Polur (dist
Tiruvannamalai), Arcot (dist Ranipet), LMOIS Kolapakkam ARG (dist Chengalpattu), Chetpet
(dist Tiruvannamalai), Uthukottai (dist Tiruvallur) 3 each, Minnal (dist Ranipet), Zone 01
Thiruvottiyur (dist Chennai), Tondi (dist Ramanathapuram), Zone 13 Raja Annamalaipuram
(dist Chennai), RSCL-2 Kedar (dist Villupuram), Wallajah (dist Ranipet), Illayangudi (dist
Sivagangai), Kaveripakkam (dist Ranipet), Vellore (dist Vellore), Tindivanam (dist Villupuram),
Cholavaram (dist Tiruvallur), Red Hills (dist Tiruvallur), Rayakottah (dist Krishnagiri), Zone 13
1
Adyar (dist Chennai), Zone 02 Manali New Town (dist Chennai), Ambur (dist Tirupathur),
Aruppukottai (dist Virudhunagar), RSCL-2 Nemoor (dist Villupuram), Aranmanaipudur (dist
Theni), RSCL-3 Avalurpettai (dist Villupuram), Kudimiyanmalai (dist Pudukkottai), RSCL-3
Valathy (dist Villupuram) 2 each, Ennore AWS (dist Tiruvallur), Theerthandathanam (dist
Ramanathapuram), Vandavasi (dist Tiruvannamalai), Zone 01 Kathivakkam (dist Chennai),
Katpadi (dist Vellore), Gingee (dist Villupuram), Sivagiri (dist Tenkasi), Vattanam (dist
Ramanathapuram), Natrampalli (dist Tirupathur), Srivilliputhur (dist Virudhunagar), Zone 12
D156 Mugalivakkam (dist Chennai), Tiruvadanai (dist Ramanathapuram), CD Hospital
Tondiarpet (dist Chennai), Tiruchirappalli Junction (dist Thiruchirappalli), Tirumayam (dist
Pudukkottai), RSCL-2 Valavanur (dist Villupuram), Viralimalai (dist Pudukkottai), Ammundi
(dist Vellore), Bodinaickanur (dist Theni), Thekkadi (dist Theni), Thamaraipakkam (dist
Tiruvallur), Virudhunagar (dist Virudhunagar), Chembarabakkam_REV (dist Tiruvallur),
Paramakudi (dist Ramanathapuram), Zone 03 Puzhal (dist Chennai), Anna University ARG (dist
Chennai), Chembarambakkam ARG (dist Tiruvallur), Palar Anicut (dist Ranipet), Arakonam
(dist Ranipet), Mandapam (dist Ramanathapuram), Pilavakkal_Periyar Dam (dist
Virudhunagar), Kothavacherry (dist Cuddalore), RSCL-2 Soorapattu (dist Villupuram),
Vembakkam (dist Tiruvannamalai), RSCL-2 Kanjanur (dist Villupuram), Amaravathy Dam (dist
Tiruppur), TCS Mill Kethandapatti (dist Tirupathur), Tiruchirappalli Town (dist
Thiruchirappalli), Zone 06 Kolathur (dist Chennai), Vettikadu (dist Thanjavur), Zone 05 Basin
bridge (dist Chennai), Sairam Institution ARG (dist Chengalpattu), Krishnagiri (dist Krishnagiri),
Anna University (dist Chennai), Pamban (dist Ramanathapuram), Kancheepuram (dist
Kancheepuram), Poondi (dist Tiruvallur), Sattur (dist Virudhunagar), Ettayapuram (dist
Thoothukudi), Keeranur (dist Pudukkottai), Zone 04 Tondiarpet (dist Chennai), Cheyyar (dist
Tiruvannamalai), Ammoor (Walajah Railway) (dist Ranipet), Sriperumbudur (dist
Kancheepuram), Zone 03 Madhavaram (dist Chennai), Kodambakkam (dist Chennai),
NIOT_Pallikaranai ARG (dist Chennai), Vembakottai (dist Virudhunagar), Kinnakorai (dist The
Nilgiris), Kil Kotagiri Estate (dist The Nilgiris), Kariyapatti (dist Virudhunagar), Virinjipuram
AWS (dist Vellore), Walajabad (dist Kancheepuram), Chennai Collector Office (dist Chennai),
Manapparai (dist Thiruchirappalli), Keelpennathur (dist Tiruvannamalai), Peraiyur (dist
Madurai) 1 each.

06-12-2024: Kovilpatti (dist Thoothukudi), Thenparanadu (dist Thiruchirappalli) 3 each;

Kalugumalai (dist Thoothukudi), Kodaikannal Boat Club (dist Dindigul), Sivagiri (dist Tenkasi),
Vaippar (dist Thoothukudi), Ammapettai (dist Erode), Edapadi (dist Salem), Vembakottai (dist
Virudhunagar) 1 each.

07-12-2024: Sairam Institution ARG (dist Chengalpattu) 1.

08-12-2024: Pillur Dam Mettupalayam (dist Coimbatore) 4, Melur (dist Madurai),

Thaniamangalam (dist Madurai), Tirupathur (dist Sivagangai), Sirugamani KVK AWS (dist
Thiruchirappalli), Musiri (dist Thiruchirappalli), Sivagiri (dist Tenkasi) 2 each, Kilanilai (dist
Pudukkottai), Singampunari (dist Sivagangai), Vathalai Anaicut (dist Thiruchirappalli), Pulipatti
(dist Madurai), Ponnaniyar Dam (dist Thiruchirappalli), Tirupuvanam (dist Sivagangai),
Chennimalai (dist Erode) 1 each.

09-12-2024: Tirupuvanam (dist Sivagangai) 2, Kariyapatti (dist Virudhunagar) 1.

10-12-2024: None.
2
11-12-2024: Thirukuvalai (dist Nagapattinam) 3, Sembanarkoil PWD (dist Mayiladuthurai),
Velankanni (dist Nagapattinam), Nagapattinam (dist Nagapattinam), Tarangambadi (dist
Mayiladuthurai), Karaikal AWS (dist Karaikal), Karaikal (dist Karaikal), Kodiayakarai (dist
Nagapattinam), Tirupoondi (dist Nagapattinam), Vedaranyam (dist Nagapattinam),
Thalaignayer (dist Nagapattinam), Kuzhithurai (dist Kanyakumari) 2 each, Sirkali (dist
Mayiladuthurai), Mayiladuthurai AWS (dist Mayiladuthurai), Nannilam (dist Thiruvarur),
Puducherry Town (dist Puducherry), Vedaranyam AWS (dist Nagapattinam), Thiruvarur AWS
(dist Thiruvarur), Mayiladuthurai (dist Mayiladuthurai), Chidambaram AWS (dist Cuddalore) 1
each.

Week’s Rainfall (from 05-12-2024 to 11-12-2024):

Large Excess -------------------
Excess Tirupathur district.
Normal Tiruvannamalai district.
Deficient Ranipet, Sivaganga and Virudhunagar districts.
Largely Ariyalur, Chengalpattu, Chennai, Coimbatore, Cuddalore, Dharmapuri,
Deficient Dindigul, Erode, Kallakurichi, Kancheepuram, Kanyakumari, Karur,
Krishnagiri, Madurai, Mayiladuthurai, Nagapattinam, Namakkal, Nilgiris,
Perambalur, Pudukkottai, Ramanathapuram, Salem, Tenkasi, Thanjavur,
Theni, Tirunelveli, Tiruppur, Tiruvallur, Tiruvarur, Toothukudi, Trichy,
Vellore, Villupuram districts and Puducherry & Karaikal area.
No rain -------------------

For the period from 01-10-2024 to 11-12-2024:

Large Excess Krishnagiri, Tirupattur and Villupuram districts.
Excess Coimbatore, Dharmapuri, Kallakurichi, Madurai, Namakkal, Ranipet,
Salem, Sivaganga, Tiruppur, Tiruvannamalai and Vellore districts
Normal Ariyalur, Chengalpattu, Chennai, Cuddalore, Dindigul, Erode,
Kancheepuram, Kanyakumari, Karur, Mayiladuthurai, Nagapattinam,
Nilgiris, Perambalur, Pudukottai, Ramanathapuram, Thanjavur, Theni,
Tirunelveli, Tiruvallur, Tiruvarur, Trichy districts and Puducherry &
Karaikal area.
Deficient Tenkasi, Thoothukudi and Virudhunagar districts.
Largely ---------------
Deficient
No rain ---------------

P.Senthamarai Kannan
Scientist-F
for the Deputy Director General of Meteorology
Regional Meteorological Centre
College Road, Chennai-6
Dated: 11-12-2024
3
LEGEND:

Spatial rainfall distribution:

% Stations reporting Category

Rainfall
76-100 Widespread (WS/ most places)
51-75 Fairly Widespread (FWS/ many places)
26-50 Scattered (SCT/ few places)
1 -25 Isolated (ISOL/ one or two places)
No Rain Dry

Rainfall intensity:

24-hr accumulated rainfall (cm/day) Category

Upto 1 Light rain
2-6 Moderate rain
7-11 Heavy rain
12-20 Very heavy rain
≥ 21 Extremely heavy rain

4
 RAINFALL STATEMENT
Rainfall for the week ending Seasonal rainfall for the period from
11-12-2024 01-10-2024 to 11-12-2024
Districts Actual (mm) Normal Departure Actual (mm) Normal Departure (%)
(mm) (%) (mm)
Ariyalur 1.5 38.3 -96 372.5 437.5 -15
Chengalpattu 2.7 44.9 -94 573.4 638.1 -10
Chennai 9.6 40.7 -76 845.8 731.9 16
Coimbatore 2.4 14.4 -83 459.7 315.3 46
Cuddalore 1.8 59.1 -97 576.5 613.8 -6
Dharmapuri 0.5 13.5 -96 466.6 296.7 57
Dindigul 2.7 23.1 -88 450.1 413.5 9
Erode 1.7 12.0 -86 297.9 288.3 3
Kallakurichi 0.2 28.7 -99 523.3 398.6 31
Kanchipuram 7.1 42.1 -83 459.8 533.2 -14
Kanyakumari 1.6 21.4 -92 515.7 504.4 2
Karaikal 20.1 70.8 -72 1018.1 870.2 17
Karur 1.2 13.3 -91 320.8 285.8 12
Krishnagiri 2.9 10.3 -72 472.5 264.2 79
Madurai 4.1 12.4 -67 406.0 337.7 20
Mayiladuthurai 12.9 78.0 -83 671.2 767.5 -13
Nagapattinam 20.7 74.1 -72 934.4 797.0 17
Namakkal 0.9 9.0 -90 339.0 254.2 33
Nilgiris 2.4 22.2 -89 457.5 462.2 -1
Perambalur 0.5 27.9 -98 333.3 390.6 -15
Puducherry 6.4 63.5 -90 762.0 743.9 2
Pudukottai 4.1 26.3 -85 402.4 340.9 18
Ramanathapuram 11.0 35.6 -69 533.7 458.3 16
Ranipet 13.0 29.6 -56 452.3 368.4 23
Salem 1.0 16.3 -94 467.2 311.5 50
Sivagangai 9.7 20.8 -53 456.2 376.0 21
Thenkasi 6.8 21.7 -69 251.2 423.3 -41
Thanjavur 1.9 47.1 -96 497.9 502.5 -1
Theni 5.3 14.3 -63 299.1 334.2 -11
Tirunelveli 0.7 28.7 -97 433.6 444.7 -3
Tirupathur 20.5 13.7 50 459.0 246.8 86
Tiruppur 0.9 11.9 -92 355.4 284.7 25
Tiruvallur 9.4 34.3 -73 631.6 565.8 12
Tiruvannamalai 25.1 30.3 -17 556.9 403.0 38
Tiruvarur 2.3 59.1 -96 619.6 624.8 -1
Toothukudi 5.0 22.3 -77 223.7 395.4 -43
Tiruchirapalli 6.2 22.6 -73 387.2 340.1 14
Vellore 8.7 24.2 -64 411.6 341.5 21
Villupuram 9.5 36.2 -74 754.7 468.4 61
Virudhunagar 10.2 17.6 -42 255.2 363.4 -30
Tamilnadu 5.6 25.5 -78 447.8 396.9 13
Tamilnadu
Puducherry&Karaikal 5.6 25.6 -78 449.2 398.3 13

Largely deficient Deficient Normal Excess Large Excess No rain

-60% to -99% -20% to -59% -19% to +19% +20% to +59% ≥ 60% -100%
5
DISTRICT-WISE RAINFALL SCENARIO