Friday, November 20, 2015

November 20, 2015 at 01:04PM

1pm, now convective activity seen along chennai coast over Sea. Moderate rain will push in 30/45min. From FB page Weather of India

November 20, 2015 at 11:29AM

11:20am, fresh convections building up over inland along N-coast Tamilnadu. #weather

from Instagram

November 20, 2015 at 09:03AM

Chennai, Pallavaram - 8:34am, bright and sunny after early hr rains. IWM Polichalur 28.8mm. #weather

from Instagram

Venkatesh on Twitter

RT @VenkyFromTN: @SkymetWeather@ChennaiRains Urban flooding. Chitlapakkam, Poured heavily overnight. (8am) #iwm
Taken from Weather of India

Arabian Sea Low

 [a] The formation of LOW in the SE Arabian Sea is evident from gradient wind analysis chart.
Mid-Level Atmospheric Shear also supports this.  Western parts of TN ie Kumari, Nellai, Virudunagar, Theni, Dindigul will be experiencing rainfall

Reference Background from CIMSS: Using the gridded atmospheric motion vector output u and v AMV components are averaged over a mid troposphere layer (400, 500, and 600 hPa) and a lower layer (700, 775, 850, and 925 hPa). The difference in these averaged components is used to compute the speed shear between the lower and mid layers. The contours show the vector magnitude shear (absolute value). The streamlines indicate the direction of the shear.

In the case when a tropical cyclone (TC) is present, the analyses are modified in the storm region by a procedure which removes the storm circulation within a prescribed radii. This allows a more representative depiction of the environmental shear acting on the storm.

Uses: The presence/lack of atmospheric wind shear is vital to hindering/supporting TC development. A low shear environment is favorable for tropical cyclone development, while a high shear environment will deter a immature TC region from (further) developing or destroy an already mature TC. Shear values below 10 m/s (20 kts) are considered low enough for tropical cyclogenesis. 
20.11.2015: (upto 0430 hrs IST)
HVF Avadi reported 119.0mm ,KVK Kattukuppam 90.0mm, Puzal 26.0mm,Ponamalle 45.0mm and Chembarambakkam 50.0mm

On saturday, sunday... Heavy intermittent rain expected for SE,central,N coast Tamilnadu and Chennai..

Weather of India

November 20, 2015 at 02:01AM

A weak circulation is expected over S Bay in 12 hrs and drift West towards srilanka. #iwm

November 20, 2015 at 01:52AM

1:40am, today's 1st round of showers will push into S,SE suburbs and into city in 30min. #weather

from Instagram

November 20, 2015 at 01:36AM

1:10am, moderate showers seen along N,central coast Tamilnadu, S-coast Andhra. #weather

from Instagram

IWM on Instagram: “SE Arabian sea circulation is expected to move West...

In 36hrs, the easterlies along Tamilnadu coast is expected to be strong due to pull of SE Arabian circulation #iwm
Taken from Weather of India

November 20, 2015 at 01:25AM

Chennai - till 12am, Avadi got 115mm, Chemberambakkam 35mm. And more rain ahead before morning. #iwm

November 20, 2015 at 01:30AM

SE Arabian sea circulation is expected to move West in next 24 to 48 hrs.. #weather

from Instagram