Analysis show that 98B is almost fizzled out over N Bengal. Now a low-level N-S trough can be seen from N Bengal to S Andhra coast .
At 850hpa level, the N-S trough is seen from N Bengal to W-S-W Bay near to Tamilnadu coast ... http://ow.ly/i/6XRch
At mid-level (700hpa) the N-S trough is seen from N Bengal to N,N-W Bay near to Odisha coast ... http://ow.ly/i/6XRhC
At mid-levels, the anti-cyclone over S-central Rajasthan persists and will drift East in next 2 days !
An upper-level weak circulation is expected over Bihar in 24hrs and may persist with a trough slanting S-W upto S Chatisgarh for 48hrs.
Here's the plot of expected upper-level circulation over Bihar in 24hrs ... http://ow.ly/i/6XRs0
In 24hrs, the low-level NS trough will get established from Bihar, N Bengal to S tip Tamilnadu.
In that N-S trough, a low-level circulation is expected to form over S Karnataka and S Andhra on 24-Sep ... http://ow.ly/i/6XRzf
By Friday, 26-Sep... W-central India is expected to host an Anti-cyclone at 850hpa level ... signalling the Monsoon withdrawal !
Rainfall alert for next 42hrs
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Before morning of 23-Sep...
Scattered T showers for N,central,N-W,W, W-ghats Tamilnadu, W-ghats Kerala, W-ghats,S Karnataka.
Before midnight today, HEAVY rain expected over Nilgiris zone of Tamilnadu... http://ow.ly/i/6XSgg
In Next 24hrs...
Scattered T showers will be over Odisha, S,central Bengal.
AND
HEAVY, widespread rain over N,central zones of N-E states.
23-Sep...
Again heavy, scattered T showers will pop over W-ghats of Kerala, Tamilnadu, Karnataka ... http://ow.ly/i/6XSvz
23-Sep...
Scattered T showers for Bangalore, S Karnataka, N-W,N,N-central,central Tamilnadu.
23-Sep...
Some T showers will persist over Odisha.
And
HEAVY rain over N-E states will go down slowly from evening of 23-Sep.
23-Sep...
evening, late-evening - Heavy rain possible over S,S-central Andhra.
#Chennai - 23-Sep, noon, evening - T Showers possible for W,N-W,S-W suburbs than for the main zones of city !
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