Tamil Nadu Rainfall recorded on 04.10.2021

October 4, 2021
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Very heavy rains lashed Chinnmannur – Veerapandi belt as a result flash floods happened in some areas with Veerapandi recorded 124 mm rainfall while Ambasamudram in Vaigai River (not to be confused with Tirunelveli Ambasamudram) recorded 110 mm rainfall. We can see the flash floods near Koochanur (Theni) as a result of the rains here https://twitter.com/praddy06/status/1444699455098290177

A UAC lies over coastal Tamilnadu & adjoining southwest Bay of Bengal and extends upto 5.8 km above mean sea level tilting southwestwards with height. A trough in easterlies runs from this above UAC to Lakshadweep area across the interior Tamilnadu & Kerala in lower tropospheric levels. Another UAC lies over southeast Arabian Sea between 4.5 km & 5.8 km above mean sea level. It is likely to persist during next 2-3 days.

 

 

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Much needed break till 27/28th December for Tamil Nadu

December 20, 2020

Few days feels like a long break, was hectic days to be honest. Tamil Nadu goes for a good break days from today. Next phase of rains will coincide with MJO taking short cut and coming into our basin, though majority chunk will go to southern hemisphere with ITCZ going down and cyclones expected there in Southern Hemisphere. We in northern hemisphere will get our share too with some more rains.  December end and January are not our core monsoon period, so we need to be very careful in decoding the models, though they show rains. The month end rains will be there but we need to see, whether it will be widespread or isolated ones.

MJO coming back to Phase 2 by month end

So much needed break till 27/28th particularly Pondy to Cuddalore Delta belt, they badly needed this break with so much rains in last two weeks. The next rains will come from a system from West Pacific. It weakens a lot and sends a pulse (push of moisture) into our Bay of Bengal. There is very less chance for the pulse to develop into Cyclone, but it will be in the form of a inverted trough associated with easterly wave. So just before new year we will get some rains.  There is chance for rains after new year with one more pulse coming from Pacific.  But its too early to speak about it.

Pulse from the system in Pacific entering into our Bay of Bengal

What a monsoon we had so far, there are few central districts which are unlucky like Trichy, Erode, Namakkal and salem while for Kanyakumari kannu pattu pochu, since Nellai and Thoothukudi are in excess, it is rare for Kanyakumari to miss out. Pondy is 45% excess too. In December 1st week, people were wondering if Pondy-Cuddalore-Delta can manage to avoid droughts. What a change Burevi gave and then few days ago UAC in Comorin-Sri Lanka again pounded them with awesome rains.

Central and West Tamil Nadu received less rains not by too much, because none of the cyclones managed to cross from Bay of Bengal to Arabian Sea. If they had gone like that, then they would have rocked too. Overall we have got excess rainfall of 9% for the State. The best rainfall after 2015.

Will be in incommunicado mode for next one week !!!. Will try to put a post on Dam levels of the state and if possible a post on Saturn-Jupiter conjunction.

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Groundwater levels (observation wells) in Chennai and others districts of Tamil Nadu

July 17, 2020

Note: Read the two lines before going ahead. Observation wells are maintained by Govt for recording Groundwater  levels. Please dont correlate or compare with the groundwater bore levels in your place.

Chennai (levels in the 15 zones of Chennai)

The rains in Chennai 1st week of June did not happen, however towards the 3rd week and month end we got good rains and made up for the misses earlier. June is not a strong month for Chennai with just average of 55 mm and 4 rainy days. Still south Chennai got good rains and it reflects in the groundwater levels. June 2019 was worst ever in groundwater levels in the wells, so added 2018 levels for comparison. We can see that North Chennai levels are below 2018 levels while  south Chennai levels are better than 2018. Further it has been amazing July rains in South Chennai and the next month the levels are going to improve further.

Tamil Nadu (31 districts)

We had long breaks in south west monsoon which has helped in excess rains in the State. Though rains were poor in monsoon areas like Valparai, Theni and Coimbatore. The other districts got awesome rains. Even Ramanthapuram got rains which is very very very rare in South West Monsoon.  As i said 2019 was a very bad year and cant be used for comparison to any year. Most southern districts have good storage than 2019 and 2018. While for other districts it has been divided. So far July has been good, in the next month update we will see more improved levels.

Contribute more to ground water, lets continue the good work of 2019

In June 2019 after all lakes went dry, everyone in the city started contributing to increase the groundwater of the Chennai city and after having good water levels in the lakes, we have forgotten about it. I was able to see only one or two videos of people saving ground water when it rained. Last year 100’s of videos came about people saving the rain water. With Good (convective) rains ahead for Chennai, lets not ignore the good work we started in 2019. We should give back what we take.

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