Saturday, December 19, 2009

By 22-Dec-09, the Easterlies will be over Chennai, and Entire TN coast .. ..
Latest analysis of LOW level pressure and wind suggests that Easterlies is already over south-east Bay ..
Satellite shows that the Easterlies has started affecting Andaman Islands .. ... south-east Bay is getting active.
What role do condensation trails play in our climate? ..
Monsoon Pattern Breaking Down In India's Western Ghat Region ...
Wind energy output helps cut load on Tamilnadu Electricity Board ...

Another education from Mr.Anonymous

About Minimum temperature
Minimum Temperature will occur half an hour just after Sun rise. The temperature recorded at 0611 hrs IST of date 18.12.2009 may be the minimum temperature. However the other temperature noted [26.6] may NOT be the temperature of that given time. It may be around 21.6.
Coming up ..
Further the rise in pressure and the upper wind pattern also gives an impression that there may cloud formation at SE bay [90-95 Deg East]and at Comrin sea. The "Condensation Trail" [COLTRA]seen at 10000-15000 feet above ground level [flight level 100 and 150]also gives impression that there may be wet weather within another 48 hours of time from now.
Irrigation Systems in India Decrease Monsoon Rainfall ..??? ..
"south-west Bay of Bengal cools down" ...

Rains relent as south-west Bay of Bengal cools down

Heavy rains have relented over coastal Tamil Nadu after the convective activity over southwest Bay of Bengal became subdued.

On Friday, sea-surface temperatures (SSTs) had retracted over this stretch of the Bay of Bengal basin, matched only by the significant scaling-up across the peninsula over southeast Arabian Sea.

This warm pool was lying stretched right across from the east African coast and the adjoining Indian Ocean, measuring up to 30 degrees Celsius.

A cyclonic circulation over southeast Arabian Sea in the lower levels persisted on Friday, according to an India Meteorological Department (IMD) update.

A trough from this system lay extended into Marathwada, which was causing the winds to set up confluence over central India.


Westerlies in the upper levels can whip up moisture as they blow in from this part of the Arabian Sea. In combination with the seasonally moisture-laden easterlies, they are capable of dropping some rain over the area of confluence.

Fairly widespread to scattered rain has been reported from Madhya Pradesh during the last 24 hours.

Rainfall has also been reported at a few places over Tamil Nadu, Rayalaseema, coastal Andhra Pradesh and coastal and southern-interior Karnataka.

Forecasts by the Chennai Met Centre for the next two days said that rain or thundershowers are likely to occur at a few places over Tamil Nadu and Puducherry. Isolated rain or thundershowers have been forecast over coastal Andhra Pradesh, Rayalaseema, Kerala, Lakshadweep and Karnataka.

International models maintain their outlook for light to scattered showers to return to the south peninsula from Monday.

South-east coastal Tamil Nadu and adjoining Sri Lanka would continue to be the areas to witness most of the rainy weather during this phase. According to the European Centre for Medium-Range Weather Forecasts (ECMWF) a basin-wide trough of lower pressure would link the Bay of Bengal, equatorial Indian Ocean and a large part of Arabian Sea.

This is the phase that models have sought to identify with the arrival of the next wet phase of the Madden-Julian Oscillation (MJO) wave in the upper levels that has a major say on weather panning out over ground.

Towards the north, maximum temperatures were below normal over some parts of Madhya Pradesh, east Rajasthan, Tamil Nadu and south coastal Andhra Pradesh during the 24 hours ending Friday morning.

Minimum temperatures were above normal by 4 to 8 deg Celsius over many parts of Madhya Pradesh, Chhattisgarh and east Uttar Pradesh. This was attributed to the presence of moisture in the atmosphere and associated cloudiness.

The lowest minimum temperature of 4.2 deg Celsius was recorded at Sarsawa in Uttar Pradesh for a second day on Friday.
U.S.-led climate deal under threat in Copenhagen ..
NASA Maps Night-shining Clouds ...
Acid oceans: the 'evil twin' of climate change ..
Temperature in Mumbai has dropped over the century, as contrary to other metros like Delhi, Kolkata and Chennai ..
Chennai - Heavy cloud formations will be there till 2pm. Local shot showers possible after 11.30am.
Early morning satellite shows the south and south-east Bay is getting ready with a feed from Easterlies ..
Warm & Moist Easterlies will be active over Tamilnadu coast from 21-Dec .. .. very active on 22-Dec-09.
Chennai - Not a cold morning 25.0°C (5:55am) ... signs of Warm & moist Easterlies moving in from Bay.