Chennai heat wave to peak today & temp will come down from Tom. In interior areas hot days will continue

April 2, 2021
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1. Four Reasons for heat wave

  1. Dry land winds from North West – The entire march easterlies were present and the temp in coastal areas were so good staying less 35.  With land breeze coming from North west the temperature started to increase from 30th March and is expected to peak today in coastal areas.
  2. Heat advected from hot areas of Cuddapah-Rayalseema-Anantapur belt – The winds from these areas will be advected to the coastal areas of Tamil Nadu and Nellore belt.
  3. Strong Offshore Winds –  strong offshore winds will delay the sea breeze coming into the coastal areas like chennai resulting in increased heating time and thereby increasing the temp.
  4. Harmless Depression near Andaman – This Depression will move towards Thailand-Burma border areas and fizzle out. But this circulation 2-3 days ago was the reason for easterlies to be absent, resulting in land breeze over Indian peninsula

Now if read the above 4 points and co-relate to the image, u will understand the reasons for the increase in Temperature.

2. High Winds at Pamban – Rameshwaram belt tonight also partly in Vedaranyam – Kodiakkarai region

3. How will be the coming week in Chennai and other parts of state.

For coastal areas like Chennai, Pondy, Cuddalore etc, today (friday) will be the peak from tomorrow the strong land breeze will be absent though it might not dip down directly to 35-36, the temp might fall to 37 C. Assume today we are seeing 41C tomorrow Chennai will see drop to 37 C. From monday  / tuesday the temp will drop to 35/36 C.

Interiors like Salem, Karur, Trichy, Madurai will all continue to sizzle at 40 C even in next week. For them either side its land breeze and week easterlies / less winds will make these area heat more with temp remaining around 40 C.

We can see how dry these winds resulting in humidity to dip to 25% at around 12 noon the lowest in this year.

4. How will temp be on voting day in Chennai on 6th April

Next week the land breeze will be absent. Compare this pic with the one in the 1st. You can understand why there is fall in Temperature in the coastal areas. You can also see the Depression gone and return of easterlies in Bay of Bengal.

5. Hottest places in India in last 2 days

Some of the places in Tamil Nadu figured in the Top 25 hottest places of country (only observatories considered.)

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NEM ends, Dry days for next 3 weeks, MJO may return around Mid-Feb !!

January 22, 2022

A great North East Monsoon comes to end for Tamil Nadu even bettering the tally of 2015. Lets see the top North east monsoon rainfall for Tamil Nadu & Puducherry in the last 30 years

Best North East Monsoon in last 30 years for Tamil Nadu
1997 – 810 mm (All time highest)
1993 – 784 mm
2005 – 773 mm
2021 – 714 mm
2015 – 676 mm

Except for Madurai (+16%) and Ramanthapuram (+13%) all other districts have got excess rains above +19% and even for Madurai, it is wonderful rains after the good South West Monsoon rains it got.

Now lets come to the stats of Chennai

Top North East Monsoon Rainfall (Oct 1 to Dec 31) for Chennai City (Nungambakkam)
2005 – 2108 mm
2015 – 1664 mm
1888 – 1598 mm
1946 – 1582 mm
1997 – 1571 mm
2021 – 1485 mm

Normal for Oct to Dec – 867 mm

We can see that 2021 ended as the 6th best North East Monsoon ever for Chennai

Top Annual Rainfall Years – Chennai City (Nungambakkam)
2005 – 2566 mm
1996 – 2451 mm
2021 – 2259 mm
1943 – 2111 mm
2015 – 2095 mm
1847 – 2052 mm
1997 – 2035 mm

Normal for Jan to Dec – 1383 mm

For Chennai city 2021 is the 3rd best all time annual rainfall ever.

Wettest Novembers for Chennai City (Nungambakkam)
1918 – 1088.3 mm
2015 – 1049.3 mm
2021 – 1044.3 mm
1985 – 983.0 mm
1884 – 850.6 mm
1960 – 849.5 mm
1815 – 842.8 mm
1922 – 833.9 mm
1896 – 831.9 mm
1997 – 831.9 mm

Normal for November – 374 mm

Chennai City broke the 1000 mm barrier in a month for just 4th time in 2021 Nov (1918 Nov, 2015 Nov and 2005 Oct).

Next Rains for Tamil Nadu ? and Temperature in coming days

Temperature in morning will be pleasant in Tamil Nadu for next one week while at night it will be normal to slightly above normal by 1C along the coastal belts.

As for as rains are concerned we are heading for a break in rains for next ~ 20 days and then MJO if it moves into Indian ocean can bring some rains but it is too early to confirm as February is one of the driest month for Tamil Nadu. There have been exceptions in 1984, 2000 and 2002 when Tamil Nadu got massive rains after which it has been a lull of 20 years.  So we need to confirm 1st whether MJO is coming into our basin and then even if it comes, whether southern hemisphere will take bulk of the influence or will we get something too. We will get clarity by around 1st week of Feb. So lets wait till then before creating any expectations.

 

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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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