According to the Cyclone Warning Division of the India Meteorology Department, Delhi:  (at 11.30 Hrs IST)             

 The severe cyclonic storm NIVAR over southwest Bay of Bengal moved west-northwestwards with a speed of 11 kmph during past six hours and lay centred at 0830 hrs IST of 25^th November, 2020 over southwest Bay of Bengal about 240 km east-southeast of Cuddalore, about 250 km east southeast of Puducherry and 300 km south southeast of Chennai. It is very likely to intensify further into a very severe cyclonic storm during next 06 hours.

It is very likely to move west northwestwards and cross Tamil Nadu and Puducherry coasts between Karaikal and Mamallapuram around Puducherry during mid-night of 25^th and early hours of 26^th November 2020 as a very severe cyclonic storm with a wind speed of 120-130 kmph gusting to 145 kmph.

Forecast track and intensity are given below:

Warnings:

(i) Rainfall

Fairly widespread to widespread rainfall/thunderstorm activity very likely over coastal and north interior Tamilnadu, Puducherry & Karaikal, south coastal Andhra Pradesh and Rayalaseema during 25^th and 26^th November and southeast Telangana during 26^th November, 2020. Isolated extremely heavy rainfall activity also very likely over coastal & north interior Tamilnadu & Puducherry (Thanjavur, Tiruvarur, Nagapattinam, Cuddalore, Chennai, Kanchipuram, Chengalpattu, Myladuthirai, Ariyalur, Perambalur, Kallakurchi, Villupuram, Tiruvannamalai, Puducherry and Karaikal districts) during 25^th; over Nellore and Chittoor districts of Andhra Pradesh on 25^th and over Rayalaseema & southeast Telangana on 26^th November, 2020.

(ii) Wind warning

·   Gale wind speed reaching 105-115 kmph gusting to 130 kmph is prevailing over Southwest Bay of Bengal. It would further increase becoming 120-130 kmph gusting to 145 kmph during afternoon of 25^th to early hours of 26^th November.

·   Squally wind speed reaching 55-65 kmph gusting to 75 kmph is prevailing along & off Tamil Nadu, Puducherry and adjoining South Andhra Pradesh coast and over Gulf of Mannar. It will gradually increase and become gale wind speed reaching 120-130 kmph gusting to 145 kmph along & off coastal districts of north Tamil Nadu and Puducherry (Nagapattinam, Karaikal, Myladuthurai, Cuddalore, Puducherry, Villupuram & Chengalpattu) and 80-90 gusting to 100 kmph very likely over Tiruvarur, Kanchipuram, Chennai, Tiruvallur districts during afternoon of 25^th to early hrs of 26^th November, 2020.

·   Gale wind speed reaching 65-75 kmph gusting to 85 kmph very likely over adjoining  westcentral Bay of Bengal and along & off South Andhra Pradesh (Nellore & Chittoor districts), Gulf of Mannar and along and off south coastal districts of Tamil Nadu during afternoon of 25^th to early hrs of 26^th November, 2020.

(iii) Sea condition

·         Sea condition is very high over Southwest Bay of Bengal and very rough to high along & off Tamil Nadu, Puducherry, south Andhra Pradesh coasts and over Gulf of Mannar. It would gradually become phenomenal over Southwest Bay of Bengal and along & off north Tamil Nadu, Puducherry coasts during afternoon of 25^th to early hrs of 26^th November, 2020.

(iv)  Strom Surge Warning

·         Tidal wave of about 1-1.5m height above the astronomical tide is very likely to inundate the low lying areas of north coastal districts of Tamilnadu & Puducherry near the place of landfall.

(v) (a)  Damage expected over Nagapattinam,  Myladuthurai, Cuddalore, , Villupuram & Chengalpattu districts of Tamilnadu and Karaikal & Puducherry:

Ø  Total destruction of thatched houses/ extensive damage to kutcha houses.  Some damage to old pucca houses. Potential threat from flying objects.

Ø  Bending/ uprooting of power and communication poles.

Ø  Major damage to Kutcha and and Pucca roads. Flooding of escape routes.  Disruption of railways, overhead powerlines and signalling systems.

Ø  Widespread damage to standing crops, plantations, orchards, falling of green coconuts and tearing of palm fronds. Blowing down of bushy trees like mango.

Ø  Small boats, country crafts may get detached from moorings.

Ø  Visibility severely affected.

      (b)  Damage expected over Tiruvarur, Kanchipuram, Chennai, Tiruvallaur districts of Tamilnadu and adjoining Andhra Pradesh:

Ø  Damage to thatched houses/ huts with possibility of roof tops being blown off and unattached metal sheets may fly.

Ø  Damage to power and communication lines.

Ø  Damage to Kutcha and some damage to Pucca roads. Flooding of escape routes.

Ø  Breaking of tree branches, uprooting of trees. Severe damage to banana and papaya trees, horticulture and crops & orchards. Large dead limbs blown from trees.

Ø Major damage to coastal crops. Damage to embankments/ salt pans.

(vi) Fishermen Warning & Action Suggested:

Ø  Total suspension of fishing operations.

Ø  Mobilise evacuation from coastal areas. Coastal hutment dwellers to be moved to safer places.

Ø  People in affected areas to remain in safe places and indoors.  

Ø  Judicious regulation of rail, road and air traffic.

Ø  Movement in motor boats and small ships unsafe.

Kindly download MAUSAM APP for location specific forecast & warning, MEGHDOOT APP for Agromet advisory and DAMINI APP for Lightning Warning.

For details kindly visit www.rsmcnewdelhi.imd.gov.in , www.mausam.imd.gov.in

Click here to see PDF

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NB/KGS/(IMD inputs)