Friday, August 30, 2013

The SWM has started withdrawing from Western and Central Pakistan. 
The trough in the extreme North of Pakistan is "pushing" down , and the resultant WD is causing the seasonal low to weaken and elongate, that is concentrated regions are not seen. North Pakistan continues to get rains with Islamabad getting 30 mms today. 
Possibly, complete Monsoon withdrawal parameters may develop by Tuesday over entire Pakistan.

BB-11 is hovering in the UP region as a weak system. At the most, we can say it being embedded in the Monsoon Axis, is keeping active precipitation along the axis.
Rainfall is persisting along the axis line in North MP and adjoining UP.
As the system fizzles out by Saturday, rainfall will be shifted to the Eastern end of the axis. 

The western end of the monsoon axis is basically dry and has seen the SWM withdrawal commence.
Coastal Sindh region may still see some very scattered light showers on Saturday...may dry up after Sunday. West winds prevail.

Now, an UAC in the Southern Sri Lanka region is going to bring dry weather for Chennai in the next 2 days. Yes...dry weather. As the system moves Westwards and weakens in the Arabian Sea, we will see a rush of North winds into the system along the west coast, and a rush of south/south -west winds along the East (TN) coast. 

Hence, spent winds will bring dry and windy (South/South-West winds) conditions to Chennai and TN and moist winds will bring wet and North winds to Kerala.

This also forms a weak perpendicular line of wind discontinuity in the Interior Southern Peninsula, South of 12N.
Thunder showers may be expected along this line in the interiors of southern Karnataka and parts of Western TN. Kerala gets the double benefit of precipitation.

From Vagaries

Heavy rain(s) coming up for N-E states

Finally, N-E states of India to get some widespread HEAVY monsoon rain from Tomorrow. Flooding possible in Assam.. 

4pm, Showers again over S,W.Tamilnadu

RT @___narayan___: @weatherofindia It is raining in #Allahabad at 3.00 PM.  #UP #India 

4pm, Heavy rain seen over S Uttarpradesh, Uttarakhand. T. Showers over central Andhra, S,W,central Tamilnadu .. 

4pm, T. Showers also seen over S,central,N W-Ghats of Kerala. Moderate rain seen over S Bihar as well ...

#Chennai - 5pm, like yesterday, the T. showers popped over S Andhra is SLOWLY drifting South now nearing N-W suburbs, at 30km from city.

#Chennai - Yesterday HEAVY rainfall over N-W,W Suburbs ... Avadi records 89mm ... 
#Bangalore - 1:55pm, "Light rain"

2:45pm, moderate rain seen over S Andhra coast near Sriharikota... around 70km North from Chennai. More T.cells popping over N-W from city

S.Srilanka circulation and Rain for S,W Tamilnadu, S.Kerala

#Chennai - #HOT and Humid day so far 1:34pm, temperature around 33 C (feels like 39.3C) T.Showers expected today as well !

Today, a low,mid level circulation is seen near South of Srilanka ... 

The S. Srilanka circulation is expected to drift W-N-W along mouth of Gulf Mannar and Comorin sea in 36hrs .. 

Before midnight today, scattered HEAVY rain expected over S,W,N-W Tamilnadu and S,central W-Ghats of Kerala .

Today, tomorrow... rain expected over W,central Andhra as well.

T. Showers for S,central Kerala and S,W Tamilnadu to continue for next 48hrs.

#Chennai - Midnight T.shower

RT @shri611: Heavy rains in #Chennai near #Airport #Guindy #Saidapet. 11.57pm, 29 Aug. @weatherofindia

Chennai - 12:36am, moderate rain now with thunder here at Polichalur zone

ranganaathan12:00am via Silver Bird
Its raining now in T-Nagar, bit heavy for last 5 mts , hope it reduces the heat. @weatherofindia

@weatherofindia It started to rain at Tharamani #Chennai

@weatherofindia 12am Rains lash Madipakkam

@weatherofindia it is pouring buckets and buckets last 30min with #thunder #lightning..#mogappair 1am What's going on??

@weatherofindia very heavy rains in Egmore

Rainfall till 8:30am today, Nungambakkam = 42.4mm, Airport = 30.6mm