Heavy rains in the Chennai City and other KTCC belts to continue for few more hours till evening

November 1, 2022
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What a start it has been to City Monsoon, the observed rainfall till today morning shows the impact, north Chennai got while southern Chennai though it got rains, it missed out on the intense spells north Chennai got. The map and the data are detailed below –

 

24 hrs Rainfall in mm in KTCC on 01.11.2022, North Chennai special

(min 40 mm)

Kathivakkam (GCC) – 155
Perambur (GCC) – 141
New Manali Town (GCC) – 140
Tondairpet (GCC) – 140
Thiruvottiyur (GCC) – 132
Rehills (Revenue) – 127
Anna Nagar West (GCC) – 118
Royapuram (CMWSSB) – 119
Tondairpet (CMWSSB) – 111
Kolathur (GCC) – 109
Vilivakkam (IMD) – 102
Gumidipoondi (Revenue) – 102
Ice House (GCC) – 100
Ponneri (Revenue) – 99
Rippon Building (GCC) – 97
Teynampet (GCC) – 97
Royapuram (GCC) – 84
Kodambakkam (GCC) – 84
Nungambakkam (IMD) – 80
Shenoy Nagar (GCC) – 80
Cholavaram Lake (Revenue) – 79
Nandanam (IMD) – 73
T.Nagar (CMWSSB) – 72
Alwarpet (CMWSSB) – 71
Maduravoyal (GCC) – 69
Adyar (GCC) – 69
Adyar Eco Park (GCC) – 65
Ambattur (GCC) – 55
Alandur (GCC) – 55
Valsaravakkam (GCC) – 54
Velappanchavadi (IMD) – 47
Avadi (Revenue) – 46
Velacherry (GCC) – 46
Alandur (CMWSSB) – 45
Thamaraipakkam (Revenue) – 44
Valsaravakkam (CMWSSB) – 43
Uthukottai (Revenue) – 43
Perungudi (GCC) – 43
Guindy (IMD) – 42
Meenambakkam (IMD) – 41
Mugalivakkam (GCC) – 40
Madipakkam – 40

A KTCC special is clearly seen, when it rains here, most other places will remain clam, except for Kumari.  Kanyakumari got intense Thunderstorms  and the rainfall recorded are as follows

Thuckalay – 82
Eraniel – 63
Chittar II Dam – 55
Perunchani – 47
Colachel – 46
Suralacode – 46
Puthan Dam – 45
Pechiparai – 27
Kannimar – 21
Nagercoil – 20

Coming today after 8.30 am, the rains have been relentless again but the Southern Chennai, OMR, ECR have been getting very good rains and the rains have slowly shifted upto the city. Many places have already recorded 50-70 mm from 8.30 am today which would end as tomorrow 24 hrs rainfall at 8.30 am. Cumulatively, the rainfall has touched 150 mm in most places from yesterday night.

What happens next for Chennai and KTCC till tomorrow ?

Today to tomorrow morning is key time and the present rains are expected to sustain for 3-4 more hours and South Chennai as a nature balancing act is getting rains from the morning compared to north chennai places. A perfect balancing act from the nature.

As of now, the water levels in the dams are safe and have sufficient cushion, the temporary water stagnation in the roads will be the hardship. That too provided time and break in rains will drain away.

Image courtesy IMD Radar

Rains to shift where in the coming days?

Other districts such as Nagai, Tiruvarur, Pudukottai, Sivaganga, Ramanthapuram, Tuty, Nellai etc and south TN will be in action. When ever a circulation moves into Gulf of Mannar to Comorin sea, South TN and delta will get good rains, even cuddalore too.

Is it all over for Chennai from tomorrow – No, regular monsoon rains and some spells at times will continue, not these times of widespread ones, even if rains heavily it will be in isolated places.

Dedicated rainfall forecast for Chennai Basin by our Govt.

Do visit the rainfall maps and forecast maps prepared by our Government of Tamil Nadu with all rainfall data and stats and easy to understand. The website is a work in progress and will be made more user friendly as it evolves  – https://www.chennaifloodsdss.in/

 

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2020 – An year to forget and a good January rains ahead for State, while KTC & coastal TN will get rains on 2nd January

January 2, 2021

So it has been been worst year this century with over 18 lakh (1.8 million) people losing their life due to Covid-19 Pandemic and it is also the worst pandemic since 1918 Spanish Flu.

List of years to forget in 21st Century (from 2001)

2004 Indian Ocean Earthquake & Tsunami – 2,27,898 deaths
2006 Cyclone Nargis – 1,38,373 deaths
2009-10 Swine Flu Pandemic  – 2,84,000 deaths
2010 Haiti Earthquake – 1,60,000 deaths
2020 Covid-19 Pandemic – 18,24,766 deaths (till 31.12.2020)

List of Pandemics in last 130 years

1889-90 Russian Flu Pandemic – 1 million deaths
1918 Spanish Flu – 25 million deaths
1957-58 Asian Flu – 1.5 million deaths
1968-69 Hong Kong Flu – 1 million dead
1977-78 Russian Flu – 0.7 million deaths
2009-10 Swine Flu Pandemic  – 0.3 million deaths
2020 Covid-19 Pandemic – 1.8 million deaths (till 31.12.2020)

Source – https://ourworldindata.org/uploads/2020/03/Influenza-pandemics-in-comparison-1.png

There are some years which we want to forget for eternity, 2020 is one such year hardly any good happened in 2020 and even we wished when the ____ year will come to end with a hope that a new year will bring many positives and cheer in our lives.

So wish you all an Happy New Year with a hope that new year bring smiles into all our lives.  So lets come to rains. There is good news in terms rains for Tamil Nadu in January and these untimely rains also can also be bad news to some of the farmers as it coincides with the harvest time.

North East Monsoon ends well statistically

It was one of the best monsoon since 2015, with coastal districts getting excess rains as we expected before the start of the monsoon. Western districts and some of the interiors districts which got good rains in 2019 missed out this year but not too bad one. They all got very good rains in South West Monsoon. So it perfectly balances out in the end.

Most of the coastal districts with access to Bay of Bengal rocked this NEM. Trichy which got record rains in SWM got it balanced with less rains in NEM. Overall for the year, Trichy still ended on positive note.

Based on the last 90 days NEM rainfall, we can see how the rains have happened right from Southern part of Thailand, Nicobar Islands and Banda Aceh area of Indonesia, Sri Lanka and coastal Tamil Nadu. So much pulses came from Pacific crossed into Bay of Bengal this NEM.

Papanasam In Tirunelveli proved its weight again in NEM, Kodaikanal was a little disappointment.  Jamaunamarathur (Jawadhu Hills) in Tiruvannamalai is a SWM station still rocked.

At last week of November, people lost hopes of good rains in Delta, Cuddalore and Pondy. It was Chennai which was rocking till then. But then it all changed with massive rains from never dying Burevi.

What a year for Chennai and KTC belt. Some spells like the Oct 28, 2020 spells will be remembered for very very long time. Thanks for Ponmar Ram Uncle for the charts.

South Tamil Nadu district Rainfall and The Topper of this NEM is OOTHU with 2641 mm rainfall

South TN also got very good rainfall this monsoon, with Thoothukudi in excess, while Oothu in Manjolai topped the charts for North East Monsoon with whopping 2641 mm in 90 days.

NEM is only statistically over and will extend into January well into Pongal

NEM irrespective of rains extends into January or not. It ends statistically on 31.12.2020. Any rains from 01.01.2021 will be counted in the Winter Rainfall category. MJO – Equatorial Rossby (ER) Wave is expected to come in to Indian Basin (Phase 2 & 3).

Tamil Nadu Great January Rainfall years in last 50 years

in mm (30 mm and above)

2017 – 37.3
2000 – 30.3
1990 – 86.5
1986 – 65.3
1985 – 89.6
1984 – 34.5

Normal for TN in January is 18 mm. All time Record for January is 141 mm in the year 1921. We are in for  one of the good rains in Tamil Nadu this January in the 1st 20 days of January. Lets see where we end this January for Tamil Nadu.

Next Rains for Tamil will start on 2nd January, 2021

With break in Rains on New year day, the next spell of rains in Coastal Tamil Nadu, KTCC, Pondy, Cuddalore and Delta will start on 2nd January.

Farmers in Delta belt (Thanjai, Nagai, Karaikkal, Tiruvarur) and other nearby surrounding districts and Cuddalore, Villupuram districts are requested to keep in mind the extended monsoon rains till pongal this year and harvest their accordingly.

With so much travel, i could not wish many on new year day.  Once again wish you all an Happy New year.

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Tamil Nadu Dam levels as on 18.10.2020. Good storage level in most of the Dams

October 18, 2020

Mettur Dam – The biggest Dam in Tamil Nadu. Good storage in Mettur Dam for 3rd year in row. Lot of water has been released from Mettur for irrigation, else it would have touched 120 feet long back. More rains expected in catchment areas in October. Hence, it will continue to get good inflows.

Bhavanisagar Dam – The 2nd biggest dam continues to have more than 85% storage for over 2 months now.

Coimbatore Dams – most of the Dams in the district are near full level. The Top 3 dams Parambikulam, Sholayar and Aliyar are 100% full at mid-Ocotber.

Nilgiris Dams – Here too most of the dams are at close to full level with good September in the catchment areas.

Kanyakumari Dams – The two big dams Pechiparai and Perunchani are both nearly 85% full. The third biggest dam in Kanyakumari which is Kodayar is 100% full.

Tirunelveli Dams – Good storage in Papanasam and other small dams. While Manimuthar has very less storage. Manimuthar gets water from Manjolai belt from North East Monsoon. Remember Manjolai is the wettest place in India in North East Monsoon with over 2500 mm falling in these 3 months.

Theni Dams – Periyar Dam has 60% storage while Vaigai has 50% of water. With NEM on the corner, Vaigai can expect more water from its catchment rather than from Periyar Dam.

Chennai Dams – With so much water from Pennar / Krishna available in Kandaleru / Somasila, we are already having 5 tmc of the total capacity of 11 tmc of water.  We are going into 2021 without a drought even if NEM fails in the worst case. In positive case, with good rains, we can see water overflowing from all the 4 dams of Chennai.

Tiruvannamalai Dams – With poor SWM monsoon in the Then Pennai dams of Sathanur Dam and Krishnagiri dams have less water.

I have tried my best to get maximum number of dams from various sources. If some of the Dams are missing, either they are very small one (less than 100 mcft or 0.10 tmc) or the data is not available in public domain.

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