Desertification

Very Severe Cyclonic Storm OCKHI

A trough of low at mean sea level lay over southwest Bay of Bengal & adjoining Sri Lanka coast on 27th November, it was seen as a low pressure area over southwest Bay of Bengal and adjoining areas of southern Sri Lanka & equatorial Indian Ocean on 28th, as a well marked low pressure area over southwest Bay of Bengal and adjoining equatorial Indian Ocean and Sri Lanka at 0530 hours IST of 29th November and concentrated into a depression over southwest Bay of Bengal off the Sri Lankan coast. It lay centred at 0830 hours IST of today, the 29 November, 2017, about 80 km to the east­southeast of Hambantota and 500 km east southeast of Kanyakumari, moved westwards and crossed the Sri Lankan coast about 70 km northeast of Hambantota. It moved  west-southwestwards and lay centred at 1730 hrs IST of over  Comorin area and adjoining  Sri Lanka,  about 30 km northwest of Galle (Sri Lanka) and 340 km southeast of Kanyakumari,  moving in a  west-northwesterly direction and intensified into a deep depression and lay centered at 0230 hrs IST of 30th November, 2017 over Comorin area and neighbouring areas, about 185 km northwest of Galle (Sri Lanka) and 210 km south-southeast of Kanyakumari.

Intensification into a Very Severe Cyclonic Storm

 It moved west-northwestwards and intensified into a cyclonic storm ‘OCKHI’ and lay centred at 0830 hrs IST over Comorin area and neighbouring areas, about  340 km west-northwest of Galle (Sri Lanka), 60 km south of Kanyakumari, 120 km southwest of Thiruvananthapuram and 480 km east-southeast of Minicoy (Lakshadweep) It moved  west-northwestwards over southeast Arabian Sea and intensified into a severe cyclonic storm and lay centred at 0530 hrs IST of 01st December, about 110 km north-northeast of Minicoy and 290 km southeast of Amini Divi. It moved west-northwestwards and intensified into a Very Severe Cyclonic Storm around noon of 1st December. Continuing it’s west-northwestward movement, it lay centred at 0830 hrs IST of 02nd December, 2017 over Lakshadweep area and adjoining southeast Arabian Sea, about 260 km west-northwest of Minicoy and 230 km southwest of Amini Divi. Moving in a northwesterly direction it was over eastcentral and adjoining southeast Arabian Sea, about 420 km west-northwest of Amini Divi, 880 km south-southwest of Mumbai and 1090 km south-southwest of Surat at 0830 hours IST of 3rd December 2017. It moved north-northwestwards and lay centred, about 450 km west-northwest of Amini Divi, 860 km south-southwest of Mumbai and 1070 km south-southwest of Surat at 1430 hours IST. Moving in a north-northeasterly direction, it was over eastcentral Arabian Sea, about 600 km north-northwest of Amini Divi, 670 km south-southwest of Mumbai and 850 km south-southwest of Surat at 0830 hours IST of 4th December.

Weakening into a well marked low pressure area

The Very Severe Cyclonic Storm (OCKHI) over eastcentral Arabian Sea moved north-northeastwards and weakened into a Severe Cyclonic Storm (OCKHI) and lay centred at 1730 hours IST of 04th December, 2017 over eastcentral Arabian Sea, about 720 km southsouthwest of Surat and 540 km southwest of Mumbai and weakened into a cyclonic storm in the morning and lay centred at 0830 hrs IST of 05th  December, 2017 over eastcentral Arabian Sea, about 390 km south-southwest of Surat and 230 km west-southwest of Mumbai, it further weakened into a deep depression at 1430 hours IST, laid  over eastcentral Arabian Sea, about 290 km south­southwest of Surat and 160 km west of Mumbai and was at about 350 km south-southwest of Surat and 200 km west-southwest of Mumbai at 1130 hours IST. It weakened into a depression at 2030 hours IST over eastcentral & adjoining northeast Arabian Sea and into a well marked low pressure area over east central Arabian Sea and adjoining areas of northeast Arabian Sea, north coastal Maharashtra and south coastal Gujarat at 2330 hours IST of 05th December 2017 and into a Low Pressure area over south coastal Gujarat & neighbouring areas at 0830 hours IST of 6th December 2017.
INSAT pictures of Intensification of the system

INSAT pictures of Weakening of the system
Very Severe Cyclonic Storm “OCKHI” caused heavy to very heavy rainfall at many places in Tamil Nadu, Kerala and Lakshadweep islands during the period between 30th November- 03rd December 2017.
Heavy rainfall occurred in Gujarat Region on 6th December 2017.
Heavy rainfall amounts (≥ 7 CM) are shown in Appendix-I

Climatology of frequency of recurvature of Cyclones and Depressions  (Month: Oct.-Dec; Period: 1900-2016)

APPENDIX – I
HEAVY RAINFALL (≥7CM)

 TAMILNADU & PUDUCHERRY

30 NOVEMBER 2017: Vallam (Thanjavur Dist), Thuckalay (Kanyakumari Dist), Pondicherry (Puducherry Dist) 7 each.

01 DECEMBER 2017: Papanasam (Tirunelveli Dist) 45, Manimutharu (Tirunelveli Dist) 38, Mylaudy (Kanyakumari Dist) 19, Thenkasi (Tirunelveli Dist) 17, Thuckalay (Kanyakumari Dist), Pechiparai (Kanyakumari Dist), Gudalur (Theni Dist), Bhoothapandy (Kanyakumari Dist) 16 each, Watrap (Virudhunagar Dist) 15, Maniyachi (Toothukudi Dist), Eraniel (Kanyakumari Dist), Colachel (Kanyakumari Dist) 14 each, Nagercoil (Kanyakumari Dist), Kodaikanal (Dindigul Dist), Coonoor pto (Nilgiris Dist) 13 each, Kuzhithurai (Kanyakumari Dist), Srivilliputhur (Virudhunagar Dist), Satankulam (Toothukudi Dist), Shencottah (Tirunelveli Dist), Ayikudi (Tirunelveli Dist), Coonoor (Nilgiris Dist), Srivaikuntam (Toothukudi Dist), Samayapuram (Trichy Dist) 12 each, Ottapadiram (Toothukudi Dist), Tiruchendur (Toothukudi Dist), Kovilpatti AWS (Toothukudi Dist) 11 each, Tuticorin (Toothukudi Dist), Uttamapalayam (Theni Dist), Ambasamudram (Tirunelveli Dist), Kanyakumari (Kanyakumari Dist) 10 each, Radhapuram (Tirunelveli Dist), Polur (Tiruvannamalai Dist), Kovilpatti (Toothukudi Dist), Madavaram AWS (Tiruvallur Dist), Sankarankoil (Tirunelveli Dist), Sattur (Virudhunagar Dist) 9 each, Arani (Tiruvannamalai Dist), Sivaganga (Sivaganga Dist), Sivagiri (Tirunelveli Dist), Uthiramerur (Kancheepuram Dist), Rajapalayam (Virudhunagar Dist), Anna University (Chennai Dist), Uthagamandalam (Nilgiris Dist), Grand anaicut (Thanjavur Dist), Chembarabakkam (Tiruvallur Dist), DGP office (Chennai Dist) 8 each, Musiri (Trichy Dist), Vadipatti (Madurai Dist), K.paramathi (Karur Dist), Karur (Karur Dist), Anna uty arg (Chennai Dist), Vilathikulam (Toothukudi Dist), Lalgudi (Trichy Dist), Ambur (Vellore Dist), Mayanur (Karur Dist), Panchapatti (Karur Dist), Padalur (Perambalur Dist), K bridge (Nilgiris Dist), Thamaraipakkam (Tiruvallur Dist), Cholavaram (Tiruvallur Dist), Periyakulam (Theni Dist), Nanguneri (Tirunelveli Dist), Kalugumalai (Toothukudi Dist), Chennai(N) (Chennai Dist) 7 each

02 DECEMBER 2017: Sathanur Dam (Tiruvannamalai Dist) 23, Sirkali (Nagapattinam Dist) 19, ChiDambaram (Cuddalore Dist), Anaikaranchatram(KolliDam (Nagapattinam Dist) 18 each, ChiDambaram AWS (Cuddalore Dist) 17, Virudachalam (Cuddalore Dist), Chengam (Tiruvannamalai Dist) 15 each, Gingee (Villupuram Dist), Mylam AWS (Villupuram Dist), K.m.koil (Cuddalore Dist) 14 each, Tirukoilur (Villupuram Dist), Vilupuram (Villupuram Dist), Coonoor pto (Nilgiris Dist), Karaikal (Karaikal Dist) 13 each, Cuddalore (Cuddalore Dist), Sethiathope (Cuddalore Dist), Tiruvannamalai (Tiruvannamalai Dist) 12 each, Pondicherry (Puducherry Dist) 11, Mayanur (Karur Dist), Paramathivelur (Namakkal Dist), Polur (Tiruvannamalai Dist) 10 each, Parangipettai (Cuddalore Dist), Kallakurichi (Villupuram Dist), Kodavasal (Tiruvarur Dist), Nagapattinam (Nagapattinam Dist), Vanur (Villupuram Dist), Mayiladuthurai (Nagapattinam Dist), Sankarapuram (Villupuram Dist), JayamkonDam (Ariyalur Dist), Eraniel (Kanyakumari Dist), Neyveli AWS (Cuddalore Dist), Rayakottah (Krishnagiri Dist), Kuzhithurai (Kanyakumari Dist), Ariyalur (Ariyalur Dist), Tindivanam (Villupuram Dist) 9 each, Srimushnam (Cuddalore Dist), Tozhudur (Cuddalore Dist), Tiruvaiyaru (Thanjavur Dist), Valangaiman (Tiruvarur Dist), Tiruvarur (Tiruvarur Dist), Papanasam (Thanjavur Dist), Ulundurpet (Villupuram Dist), Kothagiri (Nilgiris Dist) 8 each, Harur (Dharmapuri Dist), Panruti (Cuddalore Dist), NeeDamangalam (Tiruvarur Dist), Thuckalay (Kanyakumari Dist), Uthangarai (Krishnagiri Dist), Nagercoil (Kanyakumari Dist), Arani (Tiruvannamalai Dist), Attur (Salem Dist) 7 each.

03 DECEMBER 2017: Tiruvarur (Tiruvarur Dist) 14, Pandavaiyar head (Tiruvarur Dist), Kodavasal (Tiruvarur Dist) 13 each, Valangaiman (Tiruvarur Dist), Nannilam (Tiruvarur Dist) 12 each, Nagapattinam (Nagapattinam Dist) 11, NeeDamangalam (Tiruvarur Dist), Kumbakonam (Thanjavur Dist), Karaikal (Karaikal Dist) 9 each, Thiruthuraipoondi (Tiruvarur Dist), Aduthurai AWS (Thanjavur Dist), Tiruvadanai (Ramanathapuram Dist) 8 each, Thiruvidaimaruthur (Thanjavur Dist) 7.

 KERALA:

30 NOVEMBER 2017: Aryankavu (Kollam district) 15

01 DECEMBER 2017: Aryankavu (Kollam district) 26, Myladumpara_ agri (Idukki district) 12, Punalur (Kollam district) 9.Thiruvananthapuram AP & Neyyattinkara (both in Thiruvananthapuram district) 8 each.

02 DECEMBER 2017: Thiruvananthapuram AP 8, Angadippuram & Perinthalmanna (both in Malappuram district) 7 each.

03 DECEMBER 2017: NIL

Lakshadweep:

01 DECEMBER 2017: Minicoy-19

02 DECEMBER 2017: Minicoy – 14

The cumulative rainfall during last 96 hours ( from 0830 hours IST of 29th November to 0830 hours IST of 03 December 2017 (≥7CM)

 KERALA:

 IDUKI: MYLADUMPARA-Agri-28

KOLLAM: ARYANKAVU-46, PUNALUR-12,

MALAPURAM: PERINTHALAMANNA-8, ANGADIPURAM-7

PALAKKAD: OTTAPALAM-7

THIRUVANANTHAPURAM: TRIVANDRUM AERO-19, NEYYATTINKARA-17, THIRUVANANTHAPURAM-16, VARKALA-14, NEDUMANGAD-11

LAKSHADWEEP: MINICOY-33

 TAMILNADU & PUDUCHERRY:

 TIRUNELVELI: PAPANASAM-55, MANIMUTHARU-48, SHENCOTTAH-19, THENKASI-19, AYIKUDI-17, AMBASAMUDRAM-13, NANGUNERI-12, PALAYAMKOTTAI-11, SANKARANKOIL-11, CHERANMAHADEVI-9, SIVAGIRI-9

 ARIYALUR: JAYAMKONDAM-23, SENDURAI-15, ARIYALUR-15, THIRUMANUR-14

CHENNAI: DGP OFFICE, CHENNAI-13, CHENNAI(N)-12, ANNA UNIVERSITY-11

COIMBATORE: METTUPALAYAM-7

CUDDALORE: CHIDAMBARAM-26, VIRUDACHALAM -22, SETHIATHOPE-21, K.M.KOIL-20, CUDDALORE-19, PARANGIPETTAI-17, TOZHUDUR-16, SRIMUSHNAM-15, NEYVELI AWS-14, PANRUTI-13.

DHARMAPURI: HARUR-11, PAPPIREDDIPATTI-7

DINDIGUL: KODAIKANAL-17, NATHAM-8, PALANI-8, CHATRAPATTI-7, NILAKOTTAI-7, VEDASANDUR-7

ERODE: PERUNDURAI -8, KODUMUDI-7.

KANCHEEPURAM: UTHIRAMERUR -14, CHENNAI AP-11, MADURANTHAGAM -11, KANCHEEPURAM-11, KVK KATTUKUPPAM ARG-8, TARAMANI ARG-8, CHEYYUR-7

NAGAPATTINAM: SIRKALI-26, NAGAPATTINAM-25, ANAIKARANCHATRAM-23, MAYILADUTHURAI-21, TRANGAMBADI-10, VEDARANYAM-9

KANYAKUMARI: THUCKALAY -31, MYLAUDY -28, KUZHITHURAI-26, NAGERCOIL-25, PECHIPARAI-25, KUZHITHURAI-25, ERANIEL-24, BHOOTHAPANDY-22, COLACHEL-22, KANYAKUMARI-18

KARAIKAL: KARAIKAL-25

THANJAVUR: KUMBAKONAM-22, PAPANASAM-19, THIRUVIDAIMARUTHUR-17, TIRUVAIYARU-17, TIRUKATTUPALLI-13, VALLAM-13, PATTUKOTTAI-13, THANJAVUR PTO-12, ADIRAMPATNAM-10, GRAND ANAICUT-10, THANJAVUR-10, ADUTHURAI AWS-9, MADUKKUR-7, ORTHANAD-7

KARUR: MAYANUR-18, PANCHAPATTI-13, THOGAMALAI-11, KARUR-10, KADAVUR-9, K.PARAMATHI-8, KULITHALAI-7

KRISHNAGIRI: RAYAKOTTAH-11, UTHANGARAI-8, SHOOLAGIRI-7, HOSUR-7

TIRUVARUR: KODAVASAL-30, VALANGAIMAN-30, TIRUVARUR-27, NANNILAM-25, PANDAVAIYAR HEAD-25, NEEDAMANGALAM-22, THIRUTHURAIPOONDI-17, MANNARGUDI-11, MUTHUPET-8

TIRUVANNAMALAI: SATHANUR DAM-27, CHENGAM-20, POLUR-19, ARANI-15, TIRUVANNAMALAI-15, CHEYYAR-12, VANDAVASI-12

MADURAI: VADIPATTI-10, SHOLAVANDAN-9, MADURAI AIRPORT-8, USILAMPATTI-7

NAMAKKAL: PARAMATHIVELUR-14, MANGALAPURAM-8, RASIPURAM-7

NILGIRIS: COONOOR PTO-30, UTHAGAMANDALAM-16, KOTHAGIRI -16, COONOOR-15, KETTI-14, K BRIDGE-12

PERAMBALUR: PERAMBALUR-10, PADALUR-9, CHETTIKULAM-7

PUDUCHERRY: PONDICHERRY -22

PUDUKKOTTAI: ARANTANGI-7

RAMANATHAPURAM: TIRUVADANAI-10, PARAMAKUDI-7

SALEM: THAMMAMPATTY-13, ATTUR-11, VAZHAPADI-8, YERCAUD-7

SIVAGANGA: SIVAGANGA-12, DEVAKOTTAI-8, TIRUPATHUR-7, TIRUPUVANAM-7

THENI: GUDALUR-17, UTTAMAPALAYAM-11, PERIYAR-9

TIRUPPUR: AVINASI-8, MULANUR-8, KANGEYAM-7

TIRUVALLUR: CHEMBARABAKKAM-10, THAMARAIPAKKAM-10, CHOLAVARAM-10, MADAVARAM AWS-9, POONAMALLEE-9, TIRUVALLUR-9, POONDI-8, PUZHAL ARG-8, TIRUTTANI-8, RED HILLS-8, PONNERI-7

TOOTHUKUDI: TIRUCHENDUR-22, SATANKULAM-21, SRIVAIKUNTAM-19, TUTICORIN-18, OTTAPADIRAM-15, MANIYACHI-15, KOVILPATTI-11, VILATHIKULAM-10, KALUGUMALAI-7

TRICHY: SAMAYAPURAM-14, MUSIRI-12, LALGUDI-9, PULLAMBADI-8, MARUNGAPURI-7, THURAIYUR-7, TIRUCHIRAPALLI-7

VELLORE: ALANGAYAM-12, YELAGIRI ARG-11, VANIAYMBADI-8, AMBUR-8, VELLORE-7, KAVERIPAKKAM-7, TIRUPATTUR-7

VILLUPURAM: VILUPURAM-18, GINGEE-18, MYLAM AWS-18, VANUR-17, TIRUKOILUR-16, ULUNDURPET-14, TINDIVANAM-14, SANKARAPURAM-13, KALLAKURICHI-12, MARAKKANAM-10

VIRUDHUNAGAR: WATRAP-17, SRIVILLIPUTHUR-13, SATTUR -10, KOVILANKULAM-9, RAJAPALAYAM-8, SIVAKASI-7

No heavy rainfall occurred in Tamilnadu & Kerala on 4th & 5th

06 December 2017: GUJARAT REGION: Umergam (dist Valsad) 9, Vapi (dist Valsad) 9, Waghai (dist Dangs) 7, Pardi (dist Valsad) 7, Vansda (dist Navsari) 7, Gandevi_arg (dist Navsari) 7,

Konkan & Goa: DAHANU-10, Mumbai (COLABA )-8, TALASARI-8, Palghar-7

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