Friday, December 31, 2021

31st December...




Continuing from yesterday's post, 

Year end bonus for Chennai... Mean total rainfall for Chennai in Dec is just 177.4 mm.. And

Massive Rainfall in Chennai & the suburbs. Rainfall ending 8:30 am on 31.12.2021

------------------------------------------------------------------------------------------in mm (min 60 mm)

DGP office - 237

Avadi - 230

MRC Nagar - 215

Nungambakkam - 201

Poonamallee - 201

KK Nagar - 197

Ambattur - 196

Anna University - 190

Tondairpet - 190

Chembarabakkam - 189

ACS Medical College (Vanagaram) - 185

Nandanam - 184

Aynavaram - 177

Alwarpet - 173

Perambur - 155

Meenambakkam - 149

Kottivakkam - 145

Valsarawakkam - 143

Shollingnallur - 124

Adyar - 120

Korattur Anaicut - 118

Mogappair East - 110

Tirur (Sevvapet)- 109

Redhills - 103

Poondi - 97

Kelampakkam - 94

Anna Nagar West - 93

Pallikaranai - 90

Cholavaram - 90

Tamaraipakkam - 90

Anna Nagar - 87

Sriperumbedur - 86

Tamabaram - 69

Sathyabama University - 64

Hindustan University - 63

Katupakkam (near Vandalur) - 62

Tiruvallur - 56

Reasons Analysis by Vagarian T.Gokul (Pune) :

Leading edge of a moisture filled easterly surge approached Tamilnadu coast with winds decreasing around the edge.... probably leading to moisture convergence in the lower levels and at the same time the divergence associated with the upper level trough (east of trough axis ) probably aided in dynamic lifting by providing upper level ventilation to the column....and along with some frictional convergence as it neared the coast .... Broad understanding...


Large amounts of moisture flux over Southern bay of Bengal from south China sea
Easterly wind surge in the lower levels equatorward side of the Siberian high

Upper level divergence was seen to the east of trough axis

Information and post courtesy to Vagarian T.. Gokul.

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