Tamil Nadu Agricultural University (TNAU) has forecast mean rainfall (plus oregon minus 10% deviation from semipermanent rainfall) successful astir of the districts and a adjacent mean rainfall successful Coimbatore, Erode, Tiruppur, Dindigul and Theni districts during the Southwest Monsoon (June-September).
TNAU developed the information based connected the Southern Oscillation Index and Sea Surface Temperature values of Pacific and Indian Oceans by utilizing Australian Rainman International V.4.3. Software astatine Agro Climate Research Centre of TNAU successful Coimbatore and is presented astatine 60% probability.
Zone-wise rainfall forecast is arsenic follows:
North Eastern Zone (normal and predicted rainfall successful mm and percent of deviation):
Chennai - 440, 430, -2; Chengalpattu - 450, 438, -3; Cuddalore - 360, 360, 0; Kallakurichi - 410, 384, -6; Kancheepuram - 479, 458, -4; Ranipet - 450, 426, -5; Tiruvallur - 456, 440, -4; Tirupathur - 416, 398, -4; Thiruvannamalai - 449, 419, -7; Villupuram - 405, 372, -8; Vellore - 453, 453, 0.
Western Zone: Coimbatore - 210, 178, -15; Erode - 260, 231, -11; Tiruppur - 151, 129, -15.
North Western Zone: Dharmapuri - 392, 359, -8; Krishnagiri - 375, 377, 1; Namakkal - 336, 300, -11; Salem - 421, 410, -3.
Cauvery Delta Zone: Ariyalur - 377, 338, -10; Karur - 199, 190, -5; Mayiladuthurai - 295, 274, -7; Nagapattinam - 279, 258, -8; Perambalur - 279, 263, -6; Thanjavur - 314, 296, -6; Tiruvarur - 302, 281, -7; Tiruchi - 277, 268, -3.
Southern Zone: Dindigul - 308, 272, -12; Madurai - 325, 302, -7; Pudukkottai - 330, 323, -2; Ramanathapuram - 135, 124, -8; Sivaganga - 417, 385, -8; Theni - 215, 192, -11; Tenkasi - 175, 159, -9; Thoothukudi - 67, 61, -9; Tirunelveli - 128, 108, -16; Virudhunagar - 190, 176, -7.
Hilly Zone: The Nilgiris - 875, 823, -6.
High Rainfall: Kanniyakumari - 491, 478, -3.

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