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1/24/2008

Cold waves shiver North India

India
A western disturbance from the Himalayan region and nearby plain regions has shivered the entire northern part of India including the capital city. The icy winds from the hilly areas made most of the plain chilly since Monday. Delhi recorded the second lowest temperature (2.6 degree Celsius) while Adampur district of Punjab registered the chilliest place in the plain region of the country by dipping the mercury below five degree from zero (-5 degree Celsius) on Tuesday. This was the COLDEST NIGHT IN ITS 35 YEARS OF WEATHER RECORDS for Adampur.
“Snowfall in northern parts of the country has resulted in icy winds blowing towards the north-west plains and this is causing a dip in temperature. This can be likely to continue till Friday and then the minimum temperature may be increased." The day temperature of the capital was also recorded lower as against the average usual temperature registered in other years in the same period of time. It was maximum 17 degree Celsius, four degrees below the usual temperature. After touching the 14 degree Celsius on January 14, the mercury has gone down rapidly since Wednesday. The northern part of the country will get some relief as the western disturbance is shifting from the eastern areas. The hilly areas of Jammu and Kashmir are freezing with the minimum temperature of minus 22 degree Celsius while Himachal Pradesh’s minimum temperature is hovering around 2-3 degree Celsius.

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Peculiar weather pattern in UP
Uttar Pradesh (UP) on Wednesday was witness to an interesting weather pattern. Western parts of the state were under the grip of acute cold wave with mercury going down to sub-zero levels at some places, while minimum temperatures shot up dramatically in the eastern UP districts. East UP saw a rise in night temperatures but at the same time there was a drop in day temperature. So much so that night and day temperature was nearly equal or there was a difference of only couple of degrees. In Varanasi the minimum temperature was 12 degrees celsius and maximum temperature 14 degree celsius. Significantly, central parts of the state witnessed a "middle path". In Lucknow, maximum temperature was 20 degrees Celsius and minimum temperature 6.6 degrees Celsius. Puzzled? Here is what the weatherman has to say. "Overcast sky blocks sun rays resulting in drop in day temperature. The same clouds also prevent ground heat to disseminate into the atmosphere in the night, which forces temperature to go up." Similarly, when the sky is clear, day temperature rises due to direct penetration of sun rays but night temperature drops as ground heat easily gets scattered into the open sky. Going by the rule, minimum temperature dropped in western UP because the sky remained clear in the last 24 hours. However, east UP woke up to overcast cloudy sky on Wednesday. The clouds caused a drop in day temperature but at the same time forced night temperature to go up. Central UP was partly cloudy during the day, hence the temperature here was almost normal (middle path). Where did the clouds sneak into the state? It started on Monday after formation of a cyclonic circulation over northwest UP. The circulation gradually moved eastwards — on Tuesday it was centred over central UP and on Wednesday it was hovering over east UP. While moving from west to east, the circulation caused cloudy weather conditions in the areas coming under its path, which subsequently resulted in ‘irregular' weather pattern in different parts of the state.
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