1st Summer day on cards for Chennai, Kancheepuram, Tiruvallur,…

Location of Depression (Weakened Burevi)

Depression is still located near Pamban-Rameshwaram belt and has been in that area for past one day and will continue to remain there for one more day. So ideal location for rains in entire Tamil Nadu.

We can see the cloud temp in centre region is reduced from -58 C in morning to now just -2.5 C, so it means no clouds is left there in the centre of the Depression. All the intense clouds are pushed up north towards delta and above

Why North of Cyclone is getting rains and not South Tamil Nadu ?

In order for South Tamil Nadu like Nellai or Kanyakumari or Thenkasi to get rains, the cyclone has to move west and move into the land, the GoM are wind shear is high and it is not allowing clouds to form as it blows away the top clouds leaving the area where the Depression is located cloudless. Instead the north part of the areas where winds are converging from east. So this is why Delta – Cuddalore – Chennai is getting rains while south is dry.

When will south / South West Tamil Nadu (K4TV) and Kerala get rains ?

Once the south and West movement of Depression takes place the the convergence will shift west wards and south wards and southern Tamil Nadu will join the rain party from Ex Burevi. At the same time, west TN districts (Dindigul, Tiruppur, Coimbatore, Nilgiris also will get more rains compared to now.

So wait till the west movement for Kanyakumari, Tirunelveli, Tuty, Tenkasi, Theni  and Virudhungar (K4TV) to get rains. If the shear relaxes a bit the clouds will bloom around the centre too and that time too South TN will get rains.  Even while spinning the convergence will shift west too with pull from other side. All is not over South Tamil Nadu. They will get their share of rains.

Some bands moving from west too. Parts of Kanyakumari will get rains too from it. The non movement of Depression is why South Kerala and South TN is missing the rains.  It will get its share once it moves in.

Heavy to very heavy rains

The stationery Depression  will send bands after bands to Pondy – Cuddalore – Nagai, Thanjavur – Trichy – Karur – Villupuram – Ramanthapuram – Pudukottai – Sivagangai – Madurai – Perambalur – Ariyalur – Kallakuruchi all in for very heavy rains today to tomorrow. Once it moves little west,

Chennai and KTC belt the steady rains have been reduced to drizzles.  Once this spell stops in a while, we are in for a break before. next bands spins up maybe again later in the night / tomorrow morning.

Other districts will get moderate rains too.

Kerala  – will get pull effect rains in Southern parts of the state, when wind is pulled from west to east and they converge close to ghat areas and also in Southern coastal districts

NEM Scorecard till 04.12.2020

Tamil Nadu – 362 mm (Normal till Dec 31 is 450 mm)

Chennai  City –  940 mm (Normal till Dec 31 is 850 mm)

Massive Rainfall in Tamil Nadu on 04.12.2020

in mm (min 40 mm)

Burevi rains are the best rain filled cyclone since Cyclone Nisha in 2008. For 2nd day Delta and Cuddalore belt got very heavy rains and it will continue for 3rd day too. Compiling the rainfall is becoming a herculean even with higher cut-off.

Nagapattinam

Kollidam – 361
Manalmedu – 255
Sirkali – 210
Mayiladuthurai – 188
Thalanayar – 83
Tharangambadi – 76
Thirupoondi – 71

Cuddalore

Chidambaram – 340
Kothavacherry – 335
Annamalai Nagar – 329
Lalpet – 296
Parangipettai – 264
Kattumannarkoil – 253
Kurinjipadi – 249
Sethiyathope – 206
Bhuvanagiri – 189
Vadakuthu – 167
Me.Mathur – 166
Kuppanatham – 159
Srimushnam – 152
Vridhachalam – 151
Cuddalore Collectorate – 146
Cuddalore – 136
Vanamadevi – 136
Panruti – 132
Kudithangi – 128
Veppur – 94
Pollandurai – 90
Kattumayilur – 90
Kilacheruvai – 83
Tozhudur – 75
Lakkur – 68

Tiruvarur

Thiruthuraipoondi – 220
Kudavasal – 210
Nannilam – 139
Valangaiman – 132
Pandavaiyaru – 116
Tiruvarur – 110
Mannargudi – 106
Needamangalam – 96
Muthupettai – 63

Thanjavur

Echanviduthi – 202
Lower Anaicut – 198
Peravurani – 195
Manjalaru – 192
Pattukkottai – 168
Madukkur – 162
Papanasam – 138
Thiruvidaimaruthur – 136
Kumbakonam – 134
Ayyampettai – 134
Aduthurai – 117
Budalur – 109
Vallam – 104
Kurungulam – 98
Thanjavur – 97
Thirukkattupalli – 94
Neivasal Thenpathi – 92
Adirampatnam – 80
Vettikadu – 69
Grand Anaicut – 63
Thiruvaiyaru – 62

Ramanthapuram

Rameswaram – 204
Thangachimadam – 88
Pamban – 80
Theerthandathanam – 62
Tiruvadani – 61
Mandapam – 54
Vattanam – 54
Tondi – 44

Pudukottai

Malaiyur – 175
Karambakudi – 175
Ayinkudi – 153
Alangudi – 117
Gandarvakkottai – 88
Udayalipatti – 85
Keeranur – 84
Manamelkudi – 80
Annavasal – 79
Perungalur – 76
Thirumayam – 67
Kilanilai – 65
Nagudi – 63
Viralimalai – 62
Illuppur – 62
Arimalam – 61
Kudimiyanmalai – 57
Adanakkotai – 52
Aranthangi – 50
Pudukkottai – 48
Ponnamaravathi – 43
Karaiyur – 42
Meemisal – 42

Villupuram

Tindivanam – 143
Valavanur – 109
Koliyanur – 102
Vallam – 92
Viluppuram – 92
Mailam – 90
Mundiyampakkam – 90
Mugaiyur – 89
Kedar – 89
Marakkanam – 88
Vanur – 88
Gingee – 85
Soorapattu – 84
Kanjanur – 82
Nemoor – 79
Valathy – 72
Semmedu – 67
Anandhapuram – 54
Avalurpettai – 52

Kallakuruchi

Ulundurpet – 125
Manalurpet – 90
Eraiyur – 80
Keelpadi – 79
Vengur – 79
Thiyagadurgam – 78
Madampoondi – 76
Rishivandhiyam – 75
Tirukoilur – 75
Moongilthuraipattu – 71
Kalayanallur – 70
Sulangurichi – 65
Kallakurichi – 63
Thirupalapandal – 62
Sankarapuram – 59
Kadavanur – 56
Ariyalur – 53
Pillaiyarkuppam – 45

Tirchy

Nandhiyar Head – 121
Kallakudi – 83
Pullambadi – 80
Samayapuram – 78
Thuvakudi – 74
Tiruchirappalli Town – 65
Ponnaniyar Dam – 63
Lalgudi – 54
Marungapuri – 51
Thuraiyur – 51
Tiruchirappalli Junction – 48
Tiruchirappalli Airport 42
Golden Rock – 40

Ariyalur

Jayankondam – 110
Thirumanur – 97
Sendurai – 95
Ariyalur – 74

Perambalur

Perambalur – 104
Agaram Seegoor – 83
Eraiyur – 83
Labbaikudikadu – 75
Veppanthattai – 73
Krishnapuram – 64
Thaluthalai – 60
Chettikulam – 59
Puthu Vettakudi – 52
V.Kalathur – 49
Padalur – 43

Tiruvannamalai

Thandrampattu – 72
Kilpennathur – 63
Vandavasi – 54
Chetpet – 50
Chengam – 48
Kalasapakkam – 48
Tiruvannamalai – 43
Polur – 41

Coimbatore
Kadamaparai – 76
Upper Aliyar – 44

Salem

Veeraganoor – 63
Gangavalli – 55
Thammampatti – 40

Sivagangai

Thiruppathur – 60
Karaikudi – 48
Devakottai – 43

Tiruppur

Thirumoorthi Dam – 52
Thirumoorthy Hills – 47
Amaravathy Dam – 40

Others

Pondy, Pondy – 138
Karaikkal, Karaikkal – 73
Kodaikanal, Kodaikanal – 46
Oddenchataram, Dindigul – 42
Thoothukudi, Thoothukudi – 40

KTCC Rainfall (Chennai and Surrounding Rainfall) on 04.12.2020

in mm (min 30 mm)

Tirukalakundram – 156
Mahabalipuram – 108
Madurantagam – 98
Cholavaram – 90
Chengalpet – 86
Gummidipoondi – 81
Anna University (Guindy) – 74
Uthukottai – 74
Uthiramerur – 73
Nungambakkam – 61
Chembarabakkam AWS – 60
Meeenambakkam – 58
Thamaraipakkam – 57
Kolapakkam – 56
Ambathur – 56
Alandur – 55
Redhills – 54
Tiruttani – 54
Kelampakkam – 53
Sholinganallur – 53
West Tambaram (Somangalam) – 52
Tiruvallur – 45
Taramani – 44
Poondi – 42
Kancheepuram – 42
Tiruporur – 41
Perambur – 40
Hindustan University (Kelambakkam) – 39
Jamine Koratur – 39
Ayanavaram – 36
Pallipattu – 35
Sriperumedur – 33
Ennore – 33
Poonamalle – 30
Thiruvalangadu – 30
Ponneri – 30
R.K.Pet – 30
Chembarabakkam – 30
Tondaipet – 30
Chennai Collectorate – 30