Friday, November 13, 2015

On Thursday Late night  and and early Friday 13th  morning, the regions around Chennai received unexpected very heavy rains. Amounts of upto 47 cms was recorded, and many a usually drier lakes received a bounty, and filled up the water reserves.

The reason for this, according to me, was due to the "divergence" in the 200 jet streams, almost over the affected areas.
Where divergence (evacuation of mass) occurs in the upper levels, rising motion result. Convergence and divergence in a jet streak is caused by an imbalance of forces as a parcel accelerates into a jet streak then decelerates out of the jet streak. 
This could have created a Lower level small Vortex.
From Vagaries

97B - Next LOW over S Bay - Oh Not Again !

Next LOW has popped over S Bay and tracked as 97B ...
97B, at present is slowly consolidating ... and expected to drift West ...

By Sunday, 97B is expected to become a WML and track W/WNW towards E / NE Coast of Srilanka ...
97B is expected to make landfall along central-coast Tamilnadu (cuddalore again) on Monday, 16-Nov, evening ...

Today, evening its going to be HEAVY rain day for S,SE coast Tamilnadu.
HEAVY rain alert for S-tip Tamilnadu before morning of 14-Nov.

Due to 97B, heavy rain are expected to be back for central coast Tamilnadu from night of 14-Nov...

2:15pm, Moderate rain persists over belt from Vellore to Mahabalipuram and South extreme suburbs of Chennai ...
2:30pm, Chennai and South suburbs... more rain may push in from Sea in next 1hr...

Chennai and Rain - OMG

November 13, 2015 at 01:06PM

Nagercoil - 12:50pm, moderate rain again. While showers from Chennai had moved South. #weather

from Instagram

November 13, 2015 at 08:14AM

Chennai - 7:45am, heavy non stop rains from 7:30pm, 12-Nov. Puzhal 230mm. Polichalur 70.2mm. #weather

from Instagram

November 13, 2015 at 04:48AM

4:30am, Non stop rain for Chennai, NE Tamilnadu. And moderate rain now in Nagercoil, Kanyakumari. #weather

from Instagram