Evening squall cools down Delhi

NEW DELHI: A thunderstorm hit the city late on Wednesday, bringing some relief from the steadily climbing mercury. This was in stark contrast to the morning when the airport was under the cover of moderate to shallow fog, as the atmosphere was quite stable.

"Around 9.30pm, winds at the speed of 40-50 kmph picked up across the city and several places witnessed rain. The thunderstorm was massive and accompanied by lightening. There had been a massive moisture incursion over the city since morning , which first led to the fog and later to the thunderstorm. The storm was purely local, and a result of the high humidity levels and heat," said R K Jenamani, director in-charge IGI Met.

The day's maximum temperature was 34.8 degrees Celsius, five degrees above normal, while the minimum was 17.7 degrees Celsius, two degrees above normal. Jenamani said the morning fog occurred due to calm winds and a fresh moisture incursion that pushed humidity to 100%. "The main reason was a highly stable atmosphere. The surface temperature at 5.20am was 15.6 degrees Celsius while that at just 300m above was 25 degrees Celsius. Such an atmospheric pattern was favourable for accumulation of pollutants in the atmosphere as it does not allow any vertical and horizontal mixing of air," he said.

Visibility reduced to 200m and runway visual range came down to 400 m, leading to CAT-II operations between 2am and 9am. IMD has predicted that a western disturbance (WD) is likely to affect northwest India between March 23 and 24. "The western disturbance is likely to produce light to moderate rain at many places over Jammu & Kashmir, Himachal Pradesh and northern districts of Punjab and Haryana, and at a few places over Uttarakhand," said an official of the regional meteorological centre, Delhi.

While the WD will not have any significant impact over Delhi and will only lead to stronger winds, cloudy conditions and a slight fall in maximum temperature on March 24, thundersquall accompanied by hailstorm could occur over Jammu, HP and northern parts of Punjab , Haryana and Chandigarh.

Highly stable atmosphere Very calm winds that did not allow for dispersion of fog humidity levels touching 100% Poor air quality providing nucleus for moisture

Anda sedang membaca artikel tentang

Evening squall cools down Delhi

Dengan url

http://sehatputihgigiku.blogspot.com/2013/03/evening-squall-cools-down-delhi.html

Anda boleh menyebar luaskannya atau mengcopy paste-nya

Evening squall cools down Delhi

namun jangan lupa untuk meletakkan link

Evening squall cools down Delhi

sebagai sumbernya