More showers heading for central and south Tamilnadu coast .. http://ping.fm/Ikldm

Today morning's cloud mass east of Srilanka has become stronger and huge .. http://ping.fm/pUtNT

Morning's Huge cloud formation east of Srilanka still persists 2:30pm IST.. http://ping.fm/erabb

Chennai - Heavy cloud formation over south-west suburbs... possibility of shower is increased to 90%.

Around 28-Dec-09, a high possibility of wide Cyclonic circulation forming at the north-west tip of Sumatra .. http://ping.fm/UZ182

Till 24-Dec-09, the easterly wave is going to be active over central & south Coastal Tamilnadu.. http://ping.fm/3djFs .. even on 25-Dec

NCMRWF:: Analysis shows a High pressure building up over Central India .. http://ping.fm/E7vCn .. This will propagate the Cold weather.

NCMRWF:: Analysis shows a Low level circulation south-east of Srilanka and Easterlies active over NE Srilanka .. http://ping.fm/xeW37

IMD: Easterly wave over Bay activates N-E monsoon .. http://is.gd/5yiND

Autralia's first of this season: Tropical Cyclone Laurence (a report) ... http://is.gd/5yiL6

Easterly wave activates N-E monsoon

A prevailing easterly wave has helped power the NorthEast monsoon to be active over coastal Tamil Nadu during the 24 hours ending Tuesday morning.

Rainfall has been reported from many places over coastal Tamil Nadu and at a few places over interior Tamil Nadu. Isolated rainfall was reported over Kerala and Rayalaseema.

Wind Confluence

The confluence of winds traced over central India seems to have shifted to the seas. Opposing winds blowing into a trough had triggered activity over south-south-east Arabian Sea and adjoining southwest Indian Ocean.

In a similar fashion, a confluence has been taking place over southwest Bay of Bengal just to the east of Sri Lanka in association with the easterly wave.

Additional ground support was being provided by the sea-surface temperatures that continued to be elevated over south-east Arabian Sea and adjoining southwest Indian Ocean and slightly less so over the south-west Bay of Bengal.

Wind streamline maps over land showed that the easterlies blowing into the peninsula had pushed up the anti-cyclone to the north over the peninsula.

The north-easterlies filling the southern flanks of the anti-cyclone had caused the moisture-laden easterlies from the Bay of Bengal to make a token presence over the peninsula.

Rain forecast

The Regional Meteorological Centre, Chennai, has said in its forecasts for the next two days that rain or thundershowers are likely at many places over coastal Tamil Nadu.

Thundershowers are also likely at a few places over interior Tamil Nadu, Kerala and Lakshadweep. Isolated rain or thundershowers are likely over Rayalaseema and coastal Karnataka.

Cloud imagery on Tuesday showed convective clouds over parts of southwest Bay of Bengal and southeast Arabian Sea.

The European Centre for Medium-Range Weather Forecasts (ECMWF) has maintained its outlook for a basin-wide area of trough of low pressure showing up over south Bay of Bengal, equatorial Indian Ocean and southeast Arabian Sea during the whole of this week.



Towards the north, minimum temperatures slumped by 2 to 3 degrees Celsius over east Uttar Pradesh, Punjab and Haryana.

Adampur in Punjab recorded the lowest minimum temperature of 0 degree Celsius on Monday as cold northwesterlies (as against warmer westerlies) began to fill the plains tracking the movement of a western disturbance to the east.

An India Meteorological Department (IMD) forecast has said that strong northwesterly winds will prevail over Indo-Gangetic plains during the next four days.

This is expected to cause a further fall in minimum temperatures by 2 to 3 degrees Celsius over the Indo-Gangetic plains during the next three days.

For the first time this season, the IMD has warned of ground frost conditions over isolated pockets of Punjab, Haryana and west Uttar Pradesh during next three days.

Cold and chilly conditions can lift only with the arrival of the next western disturbance from across the border. The Global Forecast System of the US Fleet Meteorological Oceanography Centre has indicated the arrival of such a system around the weekend.

Autralia's first of this season: Tropical Cyclone Laurence

Tropical Cyclone Laurence made its second landfall over Western Australia on December 21, 2009. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite captured this image a short time before the eye went ashore.
Laurence was a Category 4 storm (on the Saffir-Simpson scale) with winds of 115 knots (213 kilometers per hour or 132 miles per hour) at its height on December 15, the day before it went ashore the first time, according to the Joint Typhoon Warning Center. It degraded into a tropical storm over land, re-emerged over the Indian Ocean and grew into a Category 3 cyclone with winds of 100 knots (185 km/hr or 115 mph) on December 21. The storm was weakening as it went ashore the second time. When Aqua MODIS acquired this photo-like image at 2:00 local time (6:00 UTC), it was somewhere between a Category 3 and Category 1 storm.
Laurence was clearly a mature, well-developed cyclone on December 21. A cloudy eye is distinctly visible as a shadowed dimple in the center of the tightly packed bands of spiraling clouds. The storm is circular, undistorted by the upper-level winds that tear cyclones apart.
The storm’s powerful winds caused significant damage to buildings along the coast, said ABC News. No injuries had been reported, though damage assessments were just beginning on the morning of December 22, when the storm had moved well inland.
Here's the track data::

Date: 13-21 DEC 2009
Cyclone-4 LAURENCE
ADV LAT LON TIME WIND PR STAT
1 -12.70 128.00 12/13/06Z 30 - TROPICAL DEPRESSION
2 -12.10 126.90 12/13/18Z 35 - TROPICAL STORM
3 -13.50 127.80 12/14/06Z 45 - TROPICAL STORM
4 -13.30 126.60 12/14/18Z 55 - TROPICAL STORM
5 -14.40 125.50 12/15/06Z 75 - CYCLONE-1
6 -15.00 124.60 12/15/18Z 115 - CYCLONE-4
7 -16.30 124.20 12/16/06Z 90 - CYCLONE-2
8 -16.80 124.20 12/16/18Z 65 - CYCLONE-1
9 -17.20 123.40 12/18/12Z 35 - TROPICAL STORM
10 -16.70 122.40 12/19/00Z 35 - TROPICAL STORM
11 -17.30 121.80 12/19/12Z 35 - TROPICAL STORM
12 -17.80 120.70 12/20/00Z 55 - TROPICAL STORM
13 -18.60 120.50 12/20/12Z 80 - CYCLONE-1
14 -19.00 120.40 12/21/00Z 100 - CYCLONE-3
15 -20.00 120.80 12/21/12Z 70 - CYCLONE-1
+12 -21.10 121.20 12/22/00Z 30 - TROPICAL DEPRESSION

Chennai - Cold weather leads to hot sales in woollen clothing .. http://is.gd/5yiyL

ECMWF:: Wide area Low pressure showing up over south Bay, equatorial Indian Ocean and southeast Arabian Sea during the whole of this week.

Adampur in Punjab recorded the lowest minimum temperature of 0 degree Celsius on Monday, 21-Dec-09

IMD has warned of ground frost conditions over isolated pockets of Punjab, Haryana and west Uttar Pradesh during next three days.

Why did Copenhagen fail to deliver a climate deal? ... http://is.gd/5yiiI

IMD: Doppler weather radar station for Ramnad .. http://is.gd/5yibb

Eastern Srilanka is in for more heavy showers till Year end 31-Dec-09.

Massive LOW pressure activity predicted over South-East corner of Bay around northern tip of Sumatra from 28-Dec-09.

Chennai - is going to be cloudy with dead high clouds, there may be some Low cloud formation after 10 am. Nothing threatening.

South-East Arabian sea is going to be very active for next 3 days.. till 25-Dec.

Today 23-Dec-09, Some heavy showers are predicted over Gulf of Mannar and South tip of Tamilnadu in afternoon or into evening.

Some sharp showers still persist over central Tamilnadu coast.. http://ping.fm/L7KNO

North and south coastal Tamilnadu is clearing up after heavy showers yesterday .. http://ping.fm/e4fsc

East & south-east Srilanka is in for very heavy showers today .. http://ping.fm/5PmL8

AS the analysis showed Easterlies is going to be strong over Eastern Srilanka.. latest satellite shows Very heavy showers for East-Srilanka.

Schools declared holiday in Delta districts.. but very less rain instore for that zone today .. http://ping.fm/YQ0dm